assignment no 1 class 9

NCERT Solutions Class 9 Maths Chapter 1 Number Systems

NCERT solutions for class 9 maths chapter 1 number systems consists of an introduction about the number system and the different kinds of numbers in it. The number system has been classified into different types of numbers like natural numbers, whole numbers , integers, rational numbers, irrational numbers , etc. The NCERT solutions class 9 maths chapter 1 covers all the basics of the number system which will be helpful in forming the basic foundation of mathematics.

Class 9 maths chapter 1 number systems will help the students in differentiating between rational and irrational numbers, wherein irrational numbers cannot be expressed in the form of a ratio, and also about real numbers. Class 9 maths NCERT solutions chapter 1 number systems sample exercises can be downloaded from the links below and also you can find some of these in the exercises given below.

• NCERT Solutions Class 9 Maths Chapter 1 Ex 1.1
• NCERT Solutions Class 9 Maths Chapter 1 Ex 1.2
• NCERT Solutions Class 9 Maths Chapter 1 Ex 1.3
• NCERT Solutions Class 9 Maths Chapter 1 Ex 1.4
• NCERT Solutions Class 9 Maths Chapter 1 Ex 1.5
• NCERT Solutions Class 9 Maths Chapter 1 Ex 1.6

NCERT Solutions for Class 9 Maths Chapter 1 PDF

These NCERT solutions for class 9 maths involving the important concepts of real numbers , rational and irrational numbers, are available for free pdf download. The questions involving real numbers and their decimal form, the law of exponents are given below:

☛ Download Class 9 Maths NCERT Solutions Chapter 1 Number Systems

NCERT Class 9 Maths Chapter 1   Download PDF

NCERT Solutions for Class 9 Maths Chapter 1 Number Systems

It is advisable for the students to practice the questions in the above links as this will give them better clarity on the kind of numbers and their properties. An exercise-wise detailed analysis of NCERT Solutions Class 9 Maths Chapter 1 number systems is given below for reference.

• Class 9 Maths Chapter 1 Ex 1.1 - 4 Questions
• Class 9 Maths Chapter 1 Ex 1.2 - 4 Questions
• Class 9 Maths Chapter 1 Ex 1.3 - 9 Questions
• Class 9 Maths Chapter 1 Ex 1.4 - 2 Questions
• Class 9 Maths Chapter 1 Ex 1.5 - 5 Questions
• Class 9 Maths Chapter 1 Ex 1.6 - 11 Questions

☛ Download Class 9 Maths Chapter 1 NCERT Book

Topics Covered: The important topics focussed upon are irrational numbers, real numbers, and real numbers when expanded in the decimal form. The class 9 maths NCERT solutions chapter 1 covers the representation of real numbers on a number line, methods to perform operations on real numbers, and laws of exponents when dealing with real numbers.

Total Questions: Class 9 maths chapter 1 Number Systems consists of total 35 questions of which 30 are easy, 2 are moderate and 3 are long answer-type questions.

List of Formulas in NCERT Solutions Class 9 Maths Chapter 1

NCERT solutions class 9 maths chapter 1 covers important facts about the number systems which will help strengthen the math foundation. Like if a number ‘a’ is rational, and ‘b’ represents an irrational number, then ‘a+b’, and ‘a-b’ are irrational numbers, and ‘ab’ and ‘a/b’ are supposed to be irrational numbers, and ‘b’ is not equal to zero. For ‘a’ and ‘b’ positive real numbers the following formula or entities will be true:

• √ab = √a √b
• √(a/b) = √a / √b

Important Questions for Class 9 Maths NCERT Solutions Chapter 1

Video Solutions for Class 9 Maths NCERT Chapter 1

FAQs on NCERT Solutions Class 9 Maths Chapter 1

Do i need to practice all questions provided in ncert solutions class 9 maths number systems.

Practicing the NCERT solutions class 9 maths number systems and exercises on real numbers, rational numbers will help in exploring the number systems in a better way. The NCERT Solutions Class 9 Maths Number Systems will also provide a good insight into the solving of problems.

Why are Class 9 Maths NCERT Solutions Chapter 1 Important?

Since the number systems chapter deals with rational and irrational numbers, real numbers, and their expansion, their decimal form, also covering the law of exponents. Hence, this makes the NCERT solutions class 9 maths important for examinations.

What are the Important Formulas in NCERT Solutions Class 9 Maths Chapter 1?

There are several formulas or entities for positive real numbers which will be helpful in learning mathematics even for higher grades. Like if one wants to rationalize the denominator of 1/ ( √a + b ), then we can multiply and divide by its algebraic conjugate which is √a - b

How Many Questions are there in NCERT Solutions Class 9 Maths Chapter 1 Real Numbers?

The questions in the NCERT Solutions Class 9 Maths Chapter 1 are a great way for learning real numbers. There are around 35 questions dealing with number systems with 25 of them being simple and have straightforward logic, 6 of them are with medium complexity and 4 are elaborative questions.

What are the Important Topics Covered in NCERT Solutions Class 9 Maths Chapter 1?

The NCERT Solutions Class 9 Maths Chapter 1 deal with integers, real numbers, rational and irrational numbers. Apart from these the important topics covered are the real numbers, and what happens when they are expanded in decimal form, the law of exponents in the case of real numbers, how to differentiate between rational and irrational numbers etc.

How CBSE Students can utilize NCERT Solutions Class 9 Maths Chapter 1 effectively?

The students should first practice all the examples to understand the logic and problem solving technique and should try to solve all the exercise questions. The CBSE itself recommends the NCERT Solutions Class 9 Maths for the board exam studies.

NCERT Solutions for Class 9 Maths Chapter 1 Number Systems

NCERT Solutions for Class 9 Maths Chapter 1 Number Systems are provided here. Our NCERT Maths solutions contain all the questions of the NCERT textbook that are solved and explained beautifully. Here you will get complete NCERT Solutions for Class 9 Maths Chapter 1 all exercises Exercise in one place. These solutions are prepared by the subject experts and as per the latest NCERT syllabus and guidelines. CBSE Class 9 Students who wish to score good marks in the maths exam must practice these questions regularly.

Class 9 Maths Chapter 1 Number Systems NCERT Solutions

Below we have provided the solutions of each exercise of the chapter. Go through the links to access the solutions of exercises you want. You should also check out our NCERT Class 9 Solutions for other subjects to score good marks in the exams.

NCERT Solutions for Class 9 Maths Chapter 1 Exercise 1.1

NCERT Solutions for Class 9 Maths Chapter 1 Exercise 1.2

NCERT Solutions for Class 9 Maths Chapter 1 Exercise 1.3

NCERT Solutions for Class 9 Maths Chapter 1 Exercise 1.4

NCERT Solutions for Class 9 Maths Chapter 1 Exercise 1.5

NCERT Solutions for Class 9 Maths Chapter 1 Exercise 1.6

NCERT Solutions for Class 9 Maths Chapter 1 – Topic Discussion

Below we have listed the topics that have been discussed in this chapter. As Number System is one of the important topics in Maths, it has a weightage of 6 marks in class 9 Maths exams. 

• Introduction of Number Systems
• Irrational Numbers
• Real Numbers and Their Decimal Expansions
• Representing Real Numbers on the Number Line.
• Operations on Real Numbers
• Laws of Exponents for Real Numbers

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 (a) 1⁸ × 3⁰ × 5³ × 2²           Ans; 500,                

(b)  4 -3 × 4⁸ ÷ 4²                Ans; 64

(d) 3 -4 × 3 -5 ÷ 3¹⁰             Ans; 3 -19

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NCERT Solutions for Class 9 Maths Chapter 1 Number Systems

Ncert solutions for class 9 maths chapter 1 number systems| pdf download.

• Exercise 1.1 Chapter 1 Class 9 Maths NCERT Solutions
• Exercise 1.2 Chapter 1 Class 9 Maths NCERT Solutions
• Exercise 1.3 Chapter 1 Class 9 Maths NCERT Solutions
• Exercise 1.4 Chapter 1 Class 9 Maths NCERT Solutions
• Exercise 1.5 Chapter 1 Class 9 Maths NCERT Solutions
• Exercise 1.6 Chapter 1 Class 9 Maths NCERT Solutions

NCERT Solutions for Class 9 Maths Chapters:

Why we should solve NCERT Solutions for Chapter 1 Number Systems Class 9?

Which three integers are equal to their own cube roots, find the sum of  (3√3 +7√2) and (√3 - 5√2)., how can i download pdf of chapter 1 number systems class 9 ncert solutions, contact form.

NCERT Books

MCQ Questions for Class 9 Maths Chapter 1 Number System with Answers

MCQs from Class 9 Maths Chapter 1 – Number System are provided here to help students prepare for their upcoming Maths exam.

MCQs from CBSE Class 9 Maths Chapter 1: Number System

1. Can we write 0 in the form of p/q? a. Yes b. No c. Cannot be explained d. None of the above

Answer: (a) Explanation: 0 is a rational number and hence it can be written in the form of p/q.

Example: 0/4 = 0

2.) The three rational numbers between 3 and 4 are: a. 5/2,6/2,7/2 b. 13/4,14/4,15/4 c. 12/7,13/7,14/7 d.11/4,12/4,13/4

Answer: (b) Explanation: There are many rational numbers in between 3 and 4

To find 3 rational numbers, we need to multiply and divide both the numbers by 3+1 = 4

Hence, 3 x (4/4) = 12/4 and 4 x (4/4) = 16/4

Thus, three rational numbers between 12/4 and 16/4 are 13/4, 14/4 and 15/4.

3.) In between any two numbers there are: a. Only one rational number b. Many rational numbers c. Infinite rational numbers d. No rational number

Answer: (c) Explanation: Take the reference from question number 2 explained above.

4.) Every rational number is: a. Whole number b. Natural number c. Integer d. Real number

Answer: (d)

5.) √9 is a __________ number. a. Rational b. Irrational c. Neither rational or irrational d. None of the above

Answer: (a) Explanation: √9 = 3. Hence, 3 is a rational number.

6.) Which of the following is an irrational number? a. √16 b. √(12/3) c. √12 d. √100

Answer: (c) Explanation: √12 cannot be simplified to a rational number.

7.) 3√6 + 4√6 is equal to: a. 6√6 b. 7√6 c. 4√12 d. 7√12

Answer: (b) Explanation: 3√6 + 4√6 = (3+4)√6 = 7√6

8.) √6 x √27 is equal to: a. 9√2 b. 3√3 c. 2√2 d. 9√3

Answer: (a) Explanation: √6 x √27 = √(6 x27) = √(2x3x3x3x3) = 3×3√2 = 9√2

9.) Which of the following is equal to x 3 ? a. x 6 -x 3 b. x 6 .x 3 c. x 6 /x 3 d. (x 6 ) 3

Answer: (c) Explanation: x 6 /x 3  = x 6-3  = x 3

10.) Which of the following are irrational numbers? a. √23 b. √225 c. 0.3796 d. 7.478478

Answer: (a) Explanation: √23 = 4.79583152331…

Since the number is non-terminating non-recurring, hence, it is an irrational number.

Answer: (b)

12.)  The product of a rational and an irrational numbers is: a) Always an integer b) Always a rational number c) Always an irrational number d) Sometimes rational and sometimes irrational

14.)  A rational number between √2 and √3: a) 1.9 b) (√2. √3)/2 c) 1.5 d) 1.8

16.)  4√5 + 5√5 is equal to: a) 9√5 b) 9√10 c) 5√10 d) 7√5

(a) (ii) and (iii)

18.) √12 X √15 is equal to: a) 5√6 b) 6√5 c) 10√5 d) √25

19.)  Which of the following is equal to  x 2 ?

21.)  In between two rational number there is/are: a) Exactly one rational number b) Infinitely many rational number c) Many irrational numbers d) Only irrational numbers

22.)  What would be the denominator after rationalizing 7/(5√3 – 5√2)? a) 19 b) 20 c) 25 d) None of these

23.)  The decimal expansion of an irrational number may be: a) Terminating b) Recurring c) Either terminating or non- terminating d) Non-terminating and non-recurring

25.)  Value of (256) 0.16  X (256) 0. 09 is: a) 4 b) 16 c) 64 d) 256.25

MCQ Questions for Class 9 Maths with Answers

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NCERT Solutions For Class 9 Science Chapter 1 Matter in Our Surroundings

NCERT Solutions Class 9 Science Chapter 1 Matter in Our Surroundings – Here are all the NCERT solutions for Class 9 Science Chapter 1. This solution contains questions, answers, images, step by step explanations of the complete Chapter 1 titled Matter in Our Surroundings of Science taught in class 9. If you are a student of class 9 who is using NCERT Textbook to study Science, then you must come across Chapter 1 Matter in Our Surroundings. After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings in one place. For a better understanding of this chapter, you should also see Chapter 1 Matter in Our Surroundings Class 9 notes , Science.

Topics and Sub Topics in Class 9 Science Chapter 1 Matter in Our Surroundings:

• Matter in Our Surroundings
• Physical Nature of Matter
• Characteristics of Particles of Matter
• States of Matter
• Can Matter Change its State?
• Evaporation

These solutions are part of NCERT Solutions for Class 9 Science . Here we have given Class 9 NCERT Science Textbook Solutions for Chapter 1 matter in our Surroundings.

IN-TEXT QUESTIONS SOLVED

NCERT Textbook for Class 9 Science – Page 3 Question 1. Which of the following are matter? Chair, air, love, smell, hate, almonds, thought, cold, cold-drink, smell of perfume. Answer:  Chair, air, almonds, and cold-drink.

Question 2. Give reasons for the following observation: The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close. Answer:  The smell of hot sizzling food reaches severed meters away, as the particles of hot food have more kinetic energy and hence the rate of diffusion is more than the particles of cold food.

Question 3. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show? Answer:  A diver is able to cut through water in a swimming pool. This shows that the particles of water have intermolecular space and has less force of attraction.

Formulae Handbook for Class 9 Maths and Science

Question 4. What are the characteristics of the particles of matter? Answer. The characteristics of the particles of matter are: (1) Particles have intermolecular space. (2) Particles have intermolecular force. (3) Particles of matter are moving continuously.

Class 9 Science NCERT Textbook – Page 6 Question 1. The mass per unit volume of a substance is called density. (density = mass/volume). Arrange the following in order of increasing density: air, exhaust from chimneys, honey, water, chalk, cotton and iron. Answer:  Increasing density: air < exhaust from chimneys < cotton < water < honey < chalk < iron.

Question 3. Give reasons (a) A gas fills completely the vessel in which it is kept. (b) A gas exerts pressure on the walls of the container. (c) A wooden table should be called a solid. (d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert. Answer:  (a) The molecules of gas have high kinetic energy due to which they keep moving in all directions and hence fill the vessel completely in which they are kept. (b) A gas exerts pressure on the walls of the container because the molecules of the gas are in constant random motion due to high kinetic energy. These molecules constantly vibrate, move and hit the walls of the container thereby exerting pressure on it. (c) The molecules/particles of wooden table are tightly packed with each other, there is no intermolecular space, it cannot be compressed, it cannot flow, all these characteristics are of solid. So wooden table should be called a solid. ‘ (d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert. It is because the molecules of air has less force of attraction between them and a very small external force can separate them and pass through it. But in case of solids, the molecules have maximum force of attraction, the particles are tightly bound due to this force. Hence large amount of external force is required to pass through solid.

Question 4. Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why. Answer:  Ice is a solid but its density is lower than water due to its structure. The molecules in ice make a cage like structure with lot of vacant spaces, this makes ice float on water.

Class 9 Science NCERT Textbook – Page 9 Question 1. Convert the following temperature to Celsius scale: (a) 300 K (b) 573 K Answer. (a) 300 – 273 = 27°C (b) 573 – 273 = 300°C

Question.2. What is the physical state of water at: (a) 250°C (b) 100°C Answer:  (a) 250°C = gas (b) 100°C liquid as well as gas

Question 3. For any substance, why does the temperature remain constant during the change of state? Answer:  During the change of state of any matter heat is supplied to the substance. The molecules of this matter use heat to overcome the force of attraction between the particles, at this period of time, temperature remains constant. This extra heat is acquired by the molecules in the form of hidden heat called latent heat to change from one state of matter to the other state.

NCERT Textbook Questions – Page 10 Question 1. Why does a desert cooler cool better on a hot dry day? Answer:  The outer walls of the cooler get sprinkled by water constantly. This water evaporates due to hot dry weather. Evaporation causes cooling of inside air of cooler. This cool air is sent in the room by the fan.

Question 2. How does the water kept in an earthen pot (matka) become cool during summer? Answer:  The earthen pot is porous with lot of pores on it, the water oozes out through these pores and the water gets evaporated at the surface of the pot thereby causing cooling effect. This makes the pot cold and the water inside the pot cools by this process.

Question 3. Why does our palm feel cold when we put some acetone or petrol or perfume on it? Answer:  Acetone, petrol or perfume evaporate when they come into contact with air. The evaporation causes cooling sensation in our hands.

Question 4. Why are we able to sip hot tea or milk faster from a saucer rather than a cup? Answer:  Tea in a saucer has larger surface area than in a cup. The rate of evaporation is faster with increased surface area. The cooling of tea in saucer takes place sooner than in a cup. Hence we are able to sip hot tea or milk faster from a saucer rather than a cup.

Question 5. What type of clothes should we wear in summer? Answe:  We should wear light coloured cotton clothes in summer. Light colour because it reflects heat. Cotton clothes because it has pores in it, which absorbs sweat and allows the sweat to evaporate faster thereby giving cooling effect.

Questions From NCERT Textbook for Class 9 Science

Question 1. Convert the following temperatures to the Celsius scale. (a) 293 K (b) 470 K. Answer:  (a) 293 K into °C 293 – 273 = 20°C (b) 470 K into °C 470 – 273 = 197°C

Question 2. Convert the following temperatures to the Kelvin scale. (a) 25°C (b) 373°C. Answer:  (a) 25°C into K 25 + 273 = 298 K (b) 373°C into K 4 373 + 273 = 646 K

Question 3. Give reason for the following observations. (a) Naphthalene balls disappear with time without leaving any solid. (b) We can get the smell of perfume sitting several metres away. Answer:  (a) Naphthalene balls disappear with time without leaving any solid, because naphthalene balls sublime and directly changes into vapour state without leaving any solid. (b) We can get the smell of perfume sitting several metres away because perfume contain volatile solvent and diffuse faster and can reach people sitting several metres away.

Question 4. Arrange the following substances in increasing order of forces of attraction between the particles—water, sugar, oxygen. Answer:  Oxygen —> water —> sugar.

Question 5. What is the physical state of water at— (a) 25°C (bj 0°C (cj 100°C Answer:  (a) 25°C is liquid (b) 0°C is solid or liquid (c) 100°C is liquid and gas

Question 6. Give two reasons to justify (a) water at room temperature is a liquid. (b) an iron almirah is a solid at room temperature. Answer:  (a) Water at room temperature is a liquid because its freezing point is 0°C and boiling point is 100°C. (b) An iron almirah is a solid at room temperature because melting point of iron is higher than room temperature.

Question 7. Why is ice at 273 K more effective in cooling than water at the same temperature? Answer:  Ice at 273 K will absorb heat energy or latent heat from the medium to overcome the fusion to become water. Hence the cooling effect of ice is more than the water at same temperature because water does not absorb this extra heat from the medium.

Question 8. What produces more severe bums, boiling water or steam? Answer:  Steam at 100°C will produce more severe bums as extra heat is hidden in it called latent heat whereas the boiling water does not have this hidden heat.

NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings (Hindi Medium)

NCERT Solutions For Class 9 Science Chapter 1 – Extra Questions Solved

I. Multiple Choice Questions in Class 9 Science Chapter 1 Matter in Our Surroundings Choose the correct option: 1. Evaporation of a liquid occurs at (a) boiling point (b) a fixed temperature (c) temperature lower than boiling point (d) all temperatures 2. The conversion of gas into liquid is called (a) freezing (b) condensation (c) sublimation (d) fusion 3. The fusion is the process in which (a) liquid changes into solid (b) solid changes into liquid (c) solid changes into gas (d) gas changes into solid 4. The ice floats on water because (a) its density is more than water (b) its density is less than water (c) it has less intermolecular space (d) none of the above 5. Ice at 0°C is more effective in cooling than water at the same temperature because (a) it holds latent heat (b) the molecules use the heat to overcome the force of attraction (c) both (a) and (b) (d) none of the above 6. The density of water is maximum at (a) 0°C (b) 100°C (c) 4°C (d) 273 K 7. Solids and gases mix/dissolve in water (a) because water is a good solvent (b) because water has intermolecular space (c) diffusion is faster in water (d) all of the above 8. Choose the correct statement from the following: (a) the volume of gas ” expands on heating (b) two gases cannot diffuse into each other (c) gas is converted into solid, it is called condensation (d) gases cannot diffuse in solids 9. As the pressure of air decreases, the boiling point of the liquid (a) decreases (b) increases (c) does not changes (d) none of these 10. Which among the following can exist in vapour state? (a) oxygen (b) hydrogen (c) carbon dioxide (d) water 11. At normal pressure (1 atmospheric pressure) the boiling point of water is (a) 98°C (b) 100°C (c) 110°C (d) 90°C 12. The pressure of air is measured in atmosphere and pascal. 1 atmospheric pressure is equal to (a) 1.0 1 32 5 x 105 Pa (b) 1.01325 x 104 Pa (c) 10.1325 x 105 Pa (d) 10.1325 x 106 Pa 13. Cooking of rice at higher altitudes is difficult because (a) water boils at 100°C (b) water boils at <100°C (c) boiling point of water is constant (d) none of the above Answer:  1—(c), 2—(b), 3—(b), 4—(b), 5—(e), 6—(c), 7—(d), 8—(a), 9—(a), 10—(rf), 11 ~(b), 12—(a), 13-(b).

NCERT Solutions For Class 9 Science Chapter 1 VSAQ

Question 1. Define matter. Answer:  Anything that occupies space and has mass is called matter.

Question 3. What is diffusion? Answer. The intermingling of molecules of one substance with that of the other is called diffusion.

Question 4. What happen to the rate of diffusion if the temperature is increased? Answer:  With increased temperature, the rate of diffusion also increases as the particles gain energy and vibrate more.

Question 5. Name the state of matter that have the tendency to maintain their shape when subjected to outside force. Answer:  Solid.

Question 6. Define melting point. Answer:  The temperature at which a solid melts to become liquid at the atmospheric pressure is called its melting point.

Question 7. Define boiling point. Answer:  The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point.

Question 8. Define latent heat of vaporization. Answer:  Latent heat of vaporization is the heat energy required to change 1 kg of a liquid to gas at atmospheric pressure at its boiling point.

Question 9. Define latent heat of fusion. Answer:  Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its melting point.

Question 10. Define sublimation. Answer:  Sublimation is the change of gaseous state directly to solid state without going through liquid state and vice-versa.

Question 11. What is dry ice? Answer:  Solid carbon dioxide obtained by cooling and applying pressure on carbon dioxide gas. It does not melt so it is called dry ice.

Question 12. What is humidity? Answer:  The air holds water vapour, this air with water is called humid air and the phenomenon is called humidity.

Question.13. Give two properties of solid. Answer. (1) Solids have fixed shape and are rigid. (2) Solids cannot be compressed.

Question.14. What will happen if the pressure is reduced on solid carbon dioxide (dry ice)? Answer. If the pressure is reduced on solid carbon dioxide it will directly change into gaseous state without melting.

Question 15. dame any three substances that show sublimation. Answer:  Ammonium chloride, camphor and naphthalene balls.

Question 16. Sponge is solid, but we can still compress it. Why? Answer:  Sponge is a solid with minute pores in it. When we press the sponge the air present in these pores is released out and hence we are able to compress it.

Question 17. What is normal atmospheric pressure? Answer:  The atmospheric pressure at sea level is 1 atmosphere and taken as the normal atmospheric pressure.

Question 18. What is Kelvin? Answer:  Kelvin is the SI unit of temperature (0°C = 273 K).

Question 19. Give two examples of diffusion. Answer:  Milk drops dissolved in water and perfume sprayed in a room.

Question 20. Give the temperature at which water exists in two different phases/states. Answer:  At 0°C water can be in solid or in liquid state. At 100°C water can be in liquid or in gaseous state.

NCERT Solutions For Class 9 Science Chapter 1 SAQ

Question 1. Why do we see water droplets collected on the outer surface of a glass container, containing ice? Answer:  The water vapour present in air, comes in contact with the cold outer surface of the container thereby condensing it to form water droplets.

Question 2. Explain why solids have fixed shape but liquids and gases do not have fixed shape. Answer:  Solids have fixed shape due to strong intermolecular force of attraction between them. The liquids and gases have molecules with less intermolecular force of attraction and hence they can flow and take shape of the container.

Question 3. Liquids and gases can be compressed but it is difficult to compress solids. Why? Answer:  Liquids and gases have intermolecular space, on applying pressure externally on them the molecules can come closer thereby minimizing the space between them. But in case of solids there is no intermolecular space to do so.

Question 4. A balloon when kept in sun, bursts after some time. Why? Answer:  The balloon has air filled in it. The balloon when kept in sun gets heated and the air inside it also gets heated. The molecules of air get energy, and vibrate faster thereby exerting large force on the walls of the balloon. Due to this expansion of gases the balloon bursts.

Question 5. Why do people perspire a lot on a hot humid day? Answer:  On a hot, humid day, due to the heat our body starts sweating for the cooling mechanism i.e., by evaporation and gets cooling effect. But the air cannot hold any more water on a humid day and therefore the sweat or perspiration is seen.

Question 7. Why is it advisable to use pressure cooker at higher altitudes? Answer:  At higher altitudes, the atmospheric pressure is low and the water boils very fast and evaporates at faster rate therefore the pressure is required to increase the cooking process and this is done by using pressure cooker which increases the pressure inside the container and cooks food faster.

Question 8. What are fluids? Answer:  The states of matter that can flow due to less intermolecular force of attraction, are liquids and gases and are called as fluids.

Question 9. One kg cotton and one kg sand, which is more denser? Why? Answer:  One kg sand is more denser than 1 kg cotton because density = mass/volume . The volume required by cotton is more than the sand and density and volume are inversely proportional.

Question 10. Why is water liquid at room temperature? Answer:  At room temperature, the molecules of water have some intermolecular force of attraction and the room temperature cannot provide sufficient heat for these molecules to overcome their force of attraction and therefore remain in liquid phase.

Question 12. Cotton in solid but it floats on water. Why? Answer:  Cotton has large number of pores, in which air is trapped. Hence reducing its density and increasing the volume. Therefore cotton floats on water. But when these pores get filled with water it starts sinking.

Question 13. Why arc solids generally denser than liquids and gases? Answer:  Density of a substance is given by a formula= Mass/Volume In case of solids the molecules are tightly packed and hence large mass is concentrated in very small volume. Hence their density is more. But in case of liquids and gases, their molecules have intermolecular space and hence they don’t have large mass concentrated in small volume. So the density of solids is generally more than that of the liquids and gases.

Question 14. On a hot sunny day, why do people sprinkle water on the roof or open ground? Answer:  During hot sunny day, the surface of roof or ground absorbs large amount of heat and remains hot, on sprinkling water on these surfaces, the water absorbs large amount of heat from the surface due to its large latent heat of vaporisation thereby allowing the hot surface to cool.

Question 15. On a hot sunny dug why do we feel pleasant sitting under a tree? Answer:  Tree has lot of leaves which constantly show transpiration. Transpiration is loss of water through small tiny pores of leaves called stomata. When this water comes on the surface of leaf the water evaporates thereby causing cooling effect. Therefore we feel pleasant sitting under the tree on a hot sunny day.

Question 18. The melting point of ice is 273.16 K. What does this mean? Explain in detail. Answer:  Ice is solid at 0°C i.e., 273° K. The molecules of ice are tightly packed. These molecules have to overcome the force of attraction with which they are held and hence they gain this heat from the surrounding but the temperature remains the same as their energy is used to overcome the force of attraction between the particles. The particles have their state and starts vibrating freely and a stage reaches when the solid ice melts and is converted to liquid state at the same temperature i.e., 273 K.

Question 19. How is the high compressibility property of gas useful to us? Answer:  The gases have high compressibility. This property is used in the following situation: (1) LPG (liquefied petroleum gas) is a fuel which is made up of petroleum gas. On compressing this petroleum gas it forms liquid. (2) Oxygen cylinders in the hospitals have compressed gas filled in it. (3) CNG (compressed natural gas) is a natural gas, methane, which is compressed and used as a fuel in vehicles and at home.

Question 20. With the help of an example, explain how diffusion of gases in water is essential? Answer:  The gases from the atmosphere diffuse and dissolve in water. Gases like oxygen and carbon dioxide diffuse in water, are essential for the survival of aquatic animals and plants. Animals breathe in this oxygen dissolved in water for their survival and plants can use carbon dioxide dissolved in water for photosynthesis.

NCERT Solutions For Class 9 Science Chapter 1 LAQ

Question 2. Explain giving examples the various factors on which rate of evaporation depends. Answer:  The rate of evaporation depends on the following factors: (1) Surface area: If the surface area is increased the rate of evaporation also increases. (a) To dry the clothes we spread them to dry faster. (b) Tea in saucer cools faster than in a cup. (2) Temperature: If the temperature is increased the rate of evaporation also increases. Due to increase in temperature the particles gain more kinetic energy and change their phase from liquid to gaseous. Water will evaporate faster in sun than in shade. (3) Humidity: It is the amount of water vapour present in air. The air can hold definite amount of water vapour, at a given temperature. If the amount of water vapour is high in the air then the rate of evaporation decreases. On hot and humid day, desert coolers are not effective as the air cannot hold any more moisture to get the cooling effect. (4) Wind speed: With the increase in wind speed, the rate of evaporation increases. The particles of water vapour move away with the wind, decreasing the amount of water vapour in the surrounding.

NCERT Solutions For Class 9 Science Chapter 1 Value Based Questions

Question 1. Adil parked his bicycle on a sunny day in a parking stand of his school campus. When the school got over Adil saw his burst cycle type. Thereafter he kept less air in his cycle types and did not inflate them fully. (a) Why did the type burst? (b) Why is air compressible? (c) What value of Adil is reflected in the above act? Answer:  (a) The tyre burst because the air inside the tyre got heated and therefore exerted pressure on the walls of the tyre. (b) Air is compressible because it has large intermolecular space. (c) Adil showed the value of intelligence, awareness, and self-responsibility.

Question 2. Akshay’s friend visited his house in Mumbai and he was surprised to see air conditioners installed in all of his rooms. His friend advised Akshay to use water-coolers and save electricity. On this Akshay told, him that the water-cooler is not at all effective in coastal areas. (a) Why are water-cooler not effective in coastal areas? (b) What are the other two factors on which evaporation of water depends? (c) What value of Akshay’s friend is seen in this act? Answer:  (a) Water coolers are not effective in coastal areas due to high rate of humidity. (b) The other two factors on which evaporation of water depends are temperature and surface area. (c) Akshay’s friend showed the value of concerned citizen, morally responsible and friendly in nature.

Question 3. Sita lived in a village and could, not afford refrigerator in her house. She knew how to keep water cold and preserve all perishable items in her house. She kept ivet cloth surrounding the earthen pot to keep water cool, she also kept vegetables fresh by keeping them in wet gunny bag and timely sprinkled water over it. (a) Why did Sita keep wet cloth surrounding the earthen pot? (b) Suggest one more method of keeping the house cool in summer. (c) What value of Sita is reflected in the above case? Answer:  (a) The wet cloth gave the cooling effect to the pot, as the water in the cloth evaporated and evaporation causes cooling effect. (b) By sprinkling some water on the lawn/veranda of the house can keep the house cool. (c) Sita showed the value of responsible behaviour.

Question 4. Shreya commutes in a CNG fitted van to school every day along with many other students. She told the van driver to get the CNG connection certified and timely checked it for any leakage or loose connection of pipes. She told the driver to be more careful during summers. (a) What is CNG? (b) Why should one be more careful with CNG cylinders during summer? (c) What value of Shreya is seen in the above act? Answer:  (a) CNG is Compressed Natural Gas used as fuel. (b) During summers, the CNG connections and cylinder need to be checked because the gas expands due to heat and if there would be any leakage then it would cause fire in the vehicle. (c) Shreya showed the value of concerned citizen and morally responsible behaviour.

NCERT Solutions for Class 9 Science – List of Chapters

• Chapter 1 Matter in Our Surroundings
• Chapter 2 Is Matter Around Us Pure
• Chapter 3 Atoms and Molecules
• Chapter 4 Structure of the Atom
• Chapter 5 The Fundamental Unit of Life
• Chapter 6 Tissues
• Chapter 7 Diversity in Living Organisms
• Chapter 8 Motion
• Chapter 9 Force and Laws of Motion
• Chapter 10 Gravitation
• Chapter 11 Work, Power And Energy
• Chapter 12 Sound
• Chapter 13 Why Do we Fall Ill
• Chapter 14 Natural Resources
• Chapter 15 Improvement in Food Resources

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NCERT Solutions for Class 9 Science Chapter 1 - Matters in Our Surroundings

• NCERT Solutions
• Chapter 1 Matters In Our Surroundings

NCERT Science Class 9 Chapter 1 Question Answer - Matter in Our Surroundings FREE PDF Download

In Class 9th Science Chapter 1 - Matters In Our Surroundings. we delve to explore the fundamental concepts of matter and its various states. From understanding the properties of solids, liquids, and gases to delving into the concept of evaporation, this chapter lays the foundation for comprehending the world of matter that surrounds us. matter in our surroundings, class 9 solutions provide clarity and guidance, ensuring that students grasp these concepts with ease. Let's dive in and understand the matter in our surroundings together.

Download the FREE PDF of class 9 science chapter 1 question answer updated according to the syllabus for Class 9 Science and begin your journey toward academic success with Vedantu!

Quick Insights of Matter in Our Surroundings - NCERT Solutions for Class 9 Science

Gain a comprehensive overview of the states of matter and their significance in daily life. 

Learn the crucial concepts of solid, liquid, and gas states, which are fundamental for understanding material properties and changes. 

Chapter 1 of Class 9 Science explores various characteristics of matter, including intermolecular forces, kinetic theory, and the effect of temperature on states of matter.

NCERT Solutions for Class 9 Science Chapter 1 thoroughly explains all topics and ensures complete exam preparation. Develop proficiency in solving numerical problems related to the behavior of matter in different states, enhancing problem-solving skills.

Vedantu offers additional resources such as class notes, important concepts, formulas, and exemplar solutions to reinforce learning and ensure a strong grasp of foundational scientific principles.

Access NCERT solutions for Class 9 Science Chapter – 1 Matter in our Surroundings

Exercise -1.

1. Which of the following are the matter?

Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume.

Ans : Matter is anything that occupies space and has some mass. There are three states of matter called Solid, Liquid and Gas. On the basis of these three states, we can define that which of this is a matter:

Chair and almond are said to be in a solid state of matter as these have fixed shape.

Cold drink is in liquid state as it has the tendency to flow.

Air and the smell of perfume have gaseous particles which are free to move so this will also be considered as a gaseous state of matter.

While Love, hate, cold, smell and thought are not having any mass or neither do they occupy space these are just emotions or sensations felt by human beings so they are not considered as matter.

2. Give reasons for the following observation:

The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close.

Ans : The smell of hot sizzling food prepared by our mom reaches to us in our room from kitchen but if the food gets cold after some time, we did not feel any smell of that food this phenomenon can be defined on the basis of rate of diffusion which gets increases when the temperature get increases as high temperature increases the kinetic energy of food particles to get diffused in air. The temperature of hot food particles is high as compared to old one so its molecules get easily diffused in the air as compared to cold ones.

3: A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?

Ans : This can be explained on the properties of matter to attract the particles towards themselves and this will also decide their shape and rigidity. The force of attraction is highest in case of solid as compared to liquid and gas this defines that particles of solid are tightly bound to each other. While in case of liquid particles they have less forces of attraction which defines that there is space between the particles and due to this reason that we can cut them easily. That is why we can say that due to less forces of attraction between water molecules a diver is able to cut through water in a swimming pool.

4: What are the characteristics of particles of matter?

Ans : Matter is anything that occupies space and has some mass. There are three states of matter called Solid, Liquid and Gas.

The main characteristics of matter can be described as follows:

Particles of matter have space between them and the order of spacing is highest in gas after that liquid and solid have very less space between their particles.

Particles of matter are continuously moving in all the three states of matter.

Particles of matter attract each other with strong forces which help them to bind with each other. In solid particles attraction is very high whereas in liquid it is low and in gases it is quite low. 

Exercise -2

1: The mass per unit volume of a substance is called density (density = mass/volume). Arrange the following in order of increasing density − air, exhaust from chimney, honey, water, chalk, cotton, and iron.

Ans: Density is depending on mass and volume hence higher the mass higher will be the density and out of these heavier particles have higher mass as compare to lighter one so the order of increasing density of given substances can be written as follows:

Air < Exhaust from chimney < Cotton < Water < Honey < Chalk < Iron.

A. Tabulate the differences in the characteristics of states of matter.

Ans :Matter is anything that occupies space and has some mass. There are three states of matter called Solid, Liquid and Gas.

Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy, and density.

Rigidity : It is defined as the tendency of matter to resist a change in shape.

Compressibility: The ability of matter to reduce in volume when any type of external force is applied on it. 

Fluidity: Tendency of particles to flow this property can be seen in case of liquid and gases which can also be known as fluids. 

Filling a Gas Container: Gases neither have definite shape nor have definite volume. Gases take the shape of that container in which it gets filled. Hence by filling a gas container, it means the attainment of shape of the container by the gas.

Shape: Shape corresponds to fixed volume and boundary. Only solids have a fixed shape.

Kinetic Energy: Particles which produce energy possessed due to its continuous motion.

Density: It is defined as the mass per unit volume.

3: Give Reasons:

A. A Gas Fills Completely the Vessel in Which it is Kept.

Ans: The gas particles have a tendency to move freely in all directions as they have very less force of attraction between their particles. Like water, gas can also take the shape of the container in which it is kept. Therefore, we can say that gas completely fills the vessel in which it is kept.

B. A Gas Exerts Pressure on the Walls of the Container.

Ans: The gas particles move freely due to its lesser forces of attraction between the particles. Therefore, these gaseous particles continuously collide with each other and with the walls of the container with a greater force. Pressure is known as the force produced by the gas particles per unit area. By this we can say that gas exerts pressure on the walls of the container.

C. A wooden table should be called a solid.

Ans: A wooden table is very rigid in nature which means that it has a definite shape and its shape cannot be changed easily and has definite volume too. The shape is fixed due to strong intermolecular forces hence it attains all the properties of solid therefore, it is considered as a solid.

D. We can easily move our hands in air, but to do the same through a solid block of wood, we need a karate expert.

Ans : Air particles have very less forces of attraction between their particles so they have large space in between them. But wood has very little space between the particles due to its high force of attraction therefore, wood is considered to be of rigid nature. Due to this reason, we can easily move our hands in air but the same will not happen through a solid block of wood. For this we need a karate expert.

4: Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why.

Ans : As we know that density is defined as the mass per unit volume. This corresponds with the increase of the volume of any substance density will decrease as they are inversely proportional to each other.

Ice is solid in nature therefore it contains strong intermolecular forces which tightly bound them and they contain lesser volume but on the other hand liquid has tendency to move freely due to weak intermolecular forces and contain large volume.

From this we can say that water has larger volume and lesser density so it has a tendency to float on water.

Exercise - 3

1: Convert the following temperature to Celsius scale:

Ans: Celsius and Kelvin are two main scales to measure the temperature. By subtracting the 273K from the given value we can get the value in degrees Celsius. The formula corresponds to degree Celsius can be shown as:

\[X{}^\circ C=(X-273)\]

\[300K=(300-273){}^\circ C=27{}^\circ C\]

Ans:  $573K=(573-273){}^\circ C=300{}^\circ C$

2: What is the physical state of water at:

A. $\mathbf{\text{25}{{\text{0}}^{\text{o}}}\text{C}}$

Ans : Physical state corresponds to the state of matter whether it exists in solid, liquid or gas.

$\text{25}{{\text{0}}^{\text{o}}}\text{C}$– As we know that water starts boiling at 100°C and above this temperature water exists in gaseous state. So, this defines that water at 250°C exists in a gaseous state.

B. $\mathbf{{{100}^{o}}C}$

Ans: ${{100}^{o}}C$ – It is the starting point where water starts boiling so at this temperature water exists in both liquid and gaseous states.

3: For any substance, why does the temperature remain constant during the change of state?

Ans: This can be explained as the whole heat which we are providing to the substance to increase its temperature is used to break the intermolecular forces of attraction between them. This heat will also correspond to the latent heat i.e., the heat which gets absorbed or released during change of state. Hence all the energy gets used so temperature remains constant.

4: Suggest a method to liquefy atmospheric gases.

Ans : Atmospheric gases can be defined as the gases present in the atmosphere. It can be liquified i.e., converted into liquid by applying suitable conditions of applying pressure and by reducing their temperature.

Exercise - 4

1: Why does a desert cooler cool better on a hot dry day?

Ans : This can be explained by the process called evaporation, this is the process in which the liquid particles absorb energy from the surroundings and cause cooling. The rate of evaporation generally depends on the amount of water vapour present in the air. If the amount of water vapor present in air is more than the rate of evaporation is more or vice-versa. On a hot dry day, the amount of water vapor present in air is quite low so this will evaporate easily and make its surroundings cooler. Thus, from this we can say that a desert cooler cools better on a hot dry day as compared to rainy one.

2: How does water kept in an earthen pot (matka) become cool during summers?

Ans : An earthen pot or matka is generally made up of sand particles in which many tiny pores exist and this helps the water inside the pot to evaporate and surroundings makes the water cool. This is the reason why people kept the water in an earthen pot during summers.

3: Why does our palm feel cold when we put some acetone or petrol or perfume on it?

Ans : Acetone, petrol or perfume are considered as organic compounds which are volatile in nature whereas volatile substances are those which easily get vaporized and go through the process of evaporation. We know that during the process of evaporation particles of these organic liquids absorb energy from the surroundings or the surface of the palm and make the surroundings or surface of the palm somewhat cool. This is the reason why our palm feels cold when we put some acetone, petrol or perfume on it.

4: Why are we able to sip hot tea or milk faster from a saucer than a cup?

Ans : This can also be explained on the basis of rate of evaporation as we know that evaporation produces a cooling effect and evaporation depends on the surface area, larger the surface area higher the evaporation. As in saucer the area is larger as compared to cup so evaporation will be high in case of greater surface area. Thus, we can say that liquid cools faster in a saucer than in a cup and due to this reason, we are able to sip hot tea or milk faster from a saucer than a cup.

5: What type of clothes should we wear in the summer?

Ans : In summer we usually sweat so we have to wear cotton or light-colored clothes because cotton or light-colored clothes can absorb more sweat from our body and transfers the sweat which is in the form of liquid to the atmosphere and makes the evaporation process faster. Evaporation process causes a cooling effect which makes our body cool in cotton clothes as compared to synthetic or woolen ones.

NCERT Exercise

Celsius and Kelvin are two main scales to measure the temperature. By subtracting the 273K from the given value we can get the value in degrees Celsius. The formula corresponds to degree Celsius can be shown as:

$573K=(573-273){}^\circ C=300{}^\circ C$

2: Convert the following temperature to Kelvin scale:

A. $\mathbf{25{}^\circ C}$

Celsius and Kelvin are two main scales to measure the temperature. By adding the 273K from the given value we can get the value in degrees Celsius. The formula corresponds to degree Celsius can be shown as:

\[0{}^\circ C=273K\]

\[{{27}^{o}}C=(27+273)K=300K\]

B. $\mathbf{373{}^\circ C}$

${{373}^{o}}C=(373+273)K=646K$

3: Give reason for the following observations.

A. Naphthalene balls disappear with time without leaving any solid.

This phenomenon can be explained on the basis of sublimation which defines that solid is directly converted into gaseous form without turning it into liquid. Naphthalene is one that substances which undergo through the process of sublimation easily at room temperature. That is why we can say that naphthalene balls disappear after some time without leaving any solid.

B. We can get the smell of perfume sitting several meters away.

Gaseous particles have very less internuclear forces due to which its molecules are very free to move and it possesses high kinetic energy. Due to this reason particles of perfumes diffuse into the atmosphere and its molecules will mix in the environment which enables us to smell the perfume from several meters away.

4: Arrange the following substances in increasing order of forces of attraction between particles − water, sugar, oxygen.

Ans : Forces of attraction is the attracting power of molecules which keep them together and intermolecular forces are very strong in case of solid as compared to liquid or gas.

Here Sugar is said to be solid and contains higher forces of attraction.

Water is liquid comparatively containing lesser forces of attraction but higher as compared to gases.

Oxygen is a gas which contains very less attraction between forces.

Thus, the increasing order of forces of attraction between the particles of water, sugar and oxygen is

Oxygen < Water < Sugar

5: What is the physical state of water at:

A. $\mathbf{{{25}^{o}}C}$

Ans: Physical state corresponds to the state of matter whether it exists in solid, liquid or gas. 

$25{}^\circ C$– As we know that water melts at 0°C and above this temperature water exists in liquid state.

So, this defines that water at 25°C exists in a liquid state

B. $\mathbf{{{0}^{o}}C}$

Ans: $0{}^\circ C$– It is the temperature at which water starts melting i.e., water gets converted into liquid from ice so at this temperature water exists as both solid and liquid state.

C. $\mathbf{{{100}^{o}}C}$

Ans: $100{}^\circ C$– It is the starting point where water starts boiling so at this temperature water exists in both liquid and gaseous states.

6: Give two reasons to justify:

A. water at room temperature is a liquid.

We find water is in liquid state at room temperature this can be justified as follows:

Water does not have any fixed shape; it can take the shape of the container in which it is kept and water has definite volume.

It has a tendency to flow.

Have weak intermolecular forces between their particles.

These all describe the property of liquid so we can say that water is liquid at room temperature.

B. An Iron Almirah is a Solid at Room Temperature.

Iron almirah kept in our room is said to be solid due to following reasons:

It has a fixed shape and definite volume.

It contains strong intermolecular forces between their particles.

Rigid in nature, difficult to compress.

These all describe the property of solid so we can say that almirah is solid at room temperature.

7: Why is ice at 273 K more effective in cooling than water at the same temperature?

Ans : Here condition given that both ice and water are at same temperature i.e. 273 K. But ice at 273 K has less energy as compared to water this can be explained on the basis of latent heat of fusion which is possessed by water as an additional energy but ice does not have such type of energy. Therefore, we can say that at 273 K ice is more effective in cooling as compared to water.

8: What produces more severe burns, boiling water or steam?

Ans : Steam and water both are said to be at the same temperature i.e., 373 K. But steam contains more energy as compared to boiling water. This can be explained on the basis of latent heat of fusion which is possessed by water as an additional energy. Therefore, steam produces more severe burns than boiling water.

9: Name A, B, C, D, E and F in the following diagram showing change in its state.

A is the process of converting solid into liquid is called Melting.

B is the process which converts liquid into gaseous state, this is called vaporisation.

C in which gases get converted into liquid this is called condensation.

D is the process which converts liquid into solid. It is called solidification.

E and F are the processes which convert solid into gas or vice versa is known as sublimation.

Class 9th Science Chapter 1 - Quick Overview of Detailed Structure of Topics

Science Chapter 1 Class 9 - Important Formula and Concepts

Understanding these concepts is crucial for grasping chemistry basics and matter's nature. Science Class 9 Chapter 1 Question Answer by Vedantu will help students build foundational knowledge and enhance their learning.

To convert Celsius (°C) to Kelvin (K), K = (°C) + 273

Matter is anything that has mass and occupies space.

Solid : Definite shape and volume, particles closely packed in a fixed pattern, incompressible, and high density.

Liquid : Definite volume but no definite shape; particles are close but can move/slide past each other, almost incompressible, and moderate density.

Gas : No definite shape or volume; particles are far apart and move freely, are highly compressible, and have low density.

Increasing temperature can change the state of matter (e.g., heating ice to form water).

An increase in pressure can also change the state of matter (e.g., applying pressure to gas can liquefy it).

The process of a liquid changing into gas at a temperature below its boiling point.

Factors Affecting Evaporation : Surface area, temperature, humidity, and wind speed.

When a liquid evaporates, it absorbs heat from the surroundings, leading to a cooling effect (e.g., sweating cools the body).

Benefits of Referring to Vedantu’s NCERT Solutions for Class 9 Science Chapter 1: Matters in Our Surroundings.

V edantu’s solutions for Class 9 Science thoroughly explain all the topics covered in Chapter 1.

Concepts such as the states of matter, properties of solids, liquids, and gases, and the changes between these states are explained clearly and concisely, making complex topics easy to understand.

Each question from the NCERT textbook is solved step-by-step, helping students understand the methodology and approach required to solve different types of problems.

Detailed explanations help deepen the understanding of fundamental concepts, which is crucial for building a strong foundation in science.

The solutions are tailored to meet the requirements of the CBSE exams, helping students prepare effectively and perform well in their assessments.

Referring to Vedantu’s NCERT Solutions for Class 9 Science Chapter 1 can significantly enhance a student’s learning experience, helping them grasp the fundamental concepts of matter and its properties and excel in their academic pursuits.

Related Study Materials For Chapter 1 Matter In Our Surroundings Class 9

For more understanding, students can also download additional study materials provided by Vedantu for Chapter 1 of CBSE Class 9 Science Solutions-

NCERT Class 9 Science Chapter 1, Matter in Our Surroundings, comprehensively introduces the fundamental concept of matter and its various states. Through Ch 1 Science Class 9, students gain a clear understanding of matter. Science Chapter 1 Class 9 lays the foundation for more advanced topics in chemistry by equipping students with essential knowledge about the nature of matter. It emphasises the importance of scientific observation and experimentation in understanding the physical world, encouraging students to appreciate the complexities and wonders of the matter that constitutes our surroundings.

NCERT Solutions for Class 9 Science - Chapter-Wise Links

NCERT Study Resources for Class 9 Science

For complete preparation of Science for CBSE Class 9 exams, check out the following links for different study materials available at Vedantu.

FAQs on NCERT Solutions for Class 9 Science Chapter 1 - Matters in Our Surroundings

1. What are the different characteristics of state of matter explained in NCERT solutions class 9 Science chapter 1?

The different characteristics as elaborated in Class 9 Science Chapter 1 Questions and Answers are based on six parameters - (1) Shape, (2) Volume, (3) Rigidity or Fluidity, (4) Intermolecular force, (5) Intermolecular space, and (6) Compressibility. 

A few of the properties listed in Matter in Our Surroundings Class 9 NCERT answers suggest that solids have a set form, volume, and are rigid, whereas liquids have no fixed shape or volume and are less rigid than solids. Gas, on the other hand, has no definite shape or volume and is not hard.

2. Which are the chapters included in Class 9 Science as per the NCERT Science Book?

There are altogether fifteen chapters included in CBSE class 9 Science – (1) Matter in Our Surroundings, (2) Is Matter Around Us Pure, (3) Atoms and Molecules, (4) Structure of Atom, (5) The Fundamental Unit of Life, (6) Tissues, (7) Diversity in Living Organisms, (8) Motion, (9) Force and Laws of Motion, (10) Gravitation, (11) Work and Energy, (12) Sound, (13) Why do We Fall Ill, (14) Natural Resources, (15) Improvement in Food Resources.

3. Can NCERT Solutions be an effective way to prepare Science Class 9 Chapter 1?

Yes, NCERT Solutions will help the studnets to prepare for chapter 1 of Class 9 pretty well. While there can be a multitude of ways to prepare Ch 1 Class 9 Science, it is only when such preparation is done in a systematic manner, can an optimal output be gained. It is advised that instead of starting with a topic in Class 9 Chapter 1 solution of one’s preference, proceed according to the flow of the chapter.

4. How many questions are present in each exercise of NCERT Solutions for Class 9 Science Chapter 1?

There are five exercises in the NCERT Solutions for Class 9 Science Chapter 1. In Exercise 1, there are four questions. In Exercise 2, there are four questions. Exercise 3 also consists of four questions. In Exercise 4, there are four questions. Lastly, the NCERT exercise has nine questions. All of these questions are provided along with their solutions in the NCERT Solutions for Class 9 Science Chapter 1. 

5. Are the NCERT Solutions for Class 9 Science Chapter 1 sufficient for the exam preparation?

Yes. To do well in the test, students must study and prepare through self-study in addition to what is given in school. Students must use the best study resources provided on Vedantu for self-study. Students should refer to NCERT Answers for Class 9 Science Chapter 1 and others when studying for the Class 9 Science test. They are developed by qualified teachers and are simple to grasp.

6. What is the matter in our surroundings?

Matter in our surroundings is the first topic covered in NCERT Class 9 Science Chapter 1. In this chapter, students learn what matter is and which entities can not be considered as matter. The five basic elements that constitute matters in our surroundings are fire, earth, sky, water and air. The building blocks of matter are very small particles that can only be seen under a microscope. 

7. Write in short answer format what is matter according to the syllabus of Class 9.

Matter is defined as everything that fills space and has mass. Matter may be perceived by humans through their senses. Water, earth, fire, sky, and air are components that make up matter. It is made up of microscopic particles that can only be seen under a microscope. These are the fundamental building components of matter. Light, heat, electricity, and magnetism are not considered matter since they do not occupy space or have mass.

8. How to download the NCERT Solutions Class 9 Science Chapter 1?

Students can use NCERT Solutions for Class 9 Science Chapter 1 to download the NCERT Solutions Class 9 Science Chapter 1 from Vedantu (vedantu.com). These solutions contain the answers to all the questions from Chapter 1 of the Class 9 Science NCERT textbook in a concise and structured manner. These are available free of cost on Vedantu (vedantu.com). Students can download these using the Vedantu app as well. By going through the solutions, students can learn how to write their answers in the exam. Apart from the solutions, students can also find other study material on Vedantu, including important questions, revision notes and previous year question papers.

9. What is the topic of Class 9 science Chapter 1?

The topics covered in Science Chapter 1 Class 9 are:

Physical Nature of Matter

Characteristics of Particles of Matter 

States of Matter

Can Matter Change its State?

Evaporation

10. How many questions are present in each NCERT Solutions for Class 9 Science Chapter 1 exercise?

The number of questions present in each exercise of NCERT Solutions for Class 9 Science Chapter 1 is –

Intext Excercise 1 – 4 Questions

Intext Exercise 2 – 4 Questions

Intext Exercise 3– 4 Questions

Intext Exercise 4 – 5 Questions

NCERT Chapter Exercise – 9 Questions

NCERT Solutions for Class 9 Science

Ncert solutions for class 9.

CBSE NCERT Solutions

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Class 9 Science Assignments

We have provided below free printable Class 9 Science Assignments for Download in PDF. The Assignments have been designed based on the latest NCERT Book for Class 9 Science . These Assignments for Grade 9 Science cover all important topics which can come in your standard 9 tests and examinations. Free printable Assignments for CBSE Class 9 Science , school and class assignments, and practice test papers have been designed by our highly experienced class 9 faculty. You can free download CBSE NCERT printable Assignments for Science Class 9 with solutions and answers. All Assignments and test sheets have been prepared by expert teachers as per the latest Syllabus in Science Class 9. Students can click on the links below and download all Pdf Assignments for Science class 9 for free. All latest Kendriya Vidyalaya Class 9 Science Assignments with Answers and test papers are given below.

Science Class 9 Assignments Pdf Download

We have provided below the biggest collection of free CBSE NCERT KVS Assignments for Class 9 Science . Students and teachers can download and save all free Science assignments in Pdf for grade 9th. Our expert faculty have covered Class 9 important questions and answers for Science as per the latest syllabus for the current academic year. All test papers and question banks for Class 9 Science and CBSE Assignments for Science Class 9 will be really helpful for standard 9th students to prepare for the class tests and school examinations. Class 9th students can easily free download in Pdf all printable practice worksheets given below.

Topicwise Assignments for Class 9 Science Download in Pdf

Advantages of Class 9 Science Assignments

• As we have the best and largest collection of Science assignments for Grade 9, you will be able to easily get full list of solved important questions which can come in your examinations.
• Students will be able to go through all important and critical topics given in your CBSE Science textbooks for Class 9 .
• All Science assignments for Class 9 have been designed with answers. Students should solve them yourself and then compare with the solutions provided by us.
• Class 9 Students studying in per CBSE, NCERT and KVS schools will be able to free download all Science chapter wise worksheets and assignments for free in Pdf
• Class 9 Science question bank will help to improve subject understanding which will help to get better rank in exams

Frequently Asked Questions by Class 9 Science students

At https://www.cbsencertsolutions.com, we have provided the biggest database of free assignments for Science Class 9 which you can download in Pdf

We provide here Standard 9 Science chapter-wise assignments which can be easily downloaded in Pdf format for free.

You can click on the links above and get assignments for Science in Grade 9, all topic-wise question banks with solutions have been provided here. You can click on the links to download in Pdf.

We have provided here topic-wise Science Grade 9 question banks, revision notes and questions for all difficult topics, and other study material.

We have provided the best collection of question bank and practice tests for Class 9 for all subjects. You can download them all and use them offline without the internet.

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NCERT Solutions for Class 9 Science

Ncert solutions for class 9 science updated for 2023-24 free chapterwise pdf download.

NCERT Solutions for Class 9 Science help students to clear any doubts instantly and efficiently. These NCERT Solutions guide students to learn the important concepts which are included in the CBSE Class 9 Science syllabus. Students are required to solve the exercise questions included in the textbook to create a proper understanding of the topics.

While solving the textbook questions, doubts arise among students. The NCERT Solutions for Class 9 come in handy at such times, as they include precise explanations and detailed answers to those questions. These CBSE Science NCERT Solutions for Class 9 cover solutions to all the important chapters included in the textbook, like Matter, Atoms, Tissues, Living Organisms, Motion, Force, Laws of Motion, Gravitation, Energy and Work, Sound, Natural Resources, etc.

Along with answers to the textbook questions, these solutions provide you with extra questions, exemplar problems, the important questions from previous year question papers, sample papers , worksheets, MCQs, short answering questions, descriptive type questions, their solutions, as well as tips and tricks.

NCERT Solutions for Class 9 Science Chapter-Wise PDFs

NCERT Solutions for Class 9 Science are provided in a format for better accessibility to the students. These solutions serve as an important studying tool for students who are preparing for their board examinations and assignments.

NCERT Solutions of Class 9 Science Book Chapter Brief

Chapter 1: matter in our surrounding.

The Class 9 science textbook starts with the chapter “Matter in Our Surroundings”. Everything that we see around us is made up of material which is called matter. These things occupy space and have mass. Earlier, Indian philosophers had classified matter into 5 basic elements called Panch Tatva – air, water, earth, sky and fire. Now, modern scientists have come up with 2 types of classification, i.e., based on physical property and chemical nature. In this chapter, students will learn about the physical properties of matter .

The matter is made up of particles and these particulars are very small. The particles of matter have space between them, they are continuously moving and attract each other. The matter around us exists in 3 different states – solids, liquids and gases. These states of matter arise due to variation in the characteristic of the particles of matter. All the 3 states of matters have been explained in-depth with the help of activities. Further, the textbook explains that the state of matter is inter-convertible. The state of matter can be changed by changing temperature or pressure. The phenomenon of change of a liquid into vapour at any temperature below its boiling point is called evaporation. The rate of evaporation depends upon the surface area exposed to the atmosphere, the temperature, the humidity and the wind speed. Evaporation also causes cooling.

Topics Covered in Class 9 Science Chapter 1 Matter in Our Surrounding :

Definition of matter; solid, liquid and gas; characteristics – shape, volume, density; change of state –  melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation.

Also access the following resources for Class 9 Chapter 1 Matter in Our Surrounding at BYJU’S:

• Matter in Our Surroundings Class 9 Notes – Chapter 1
• CBSE Class 9 Science Chapter 1 Matter in Our Surroundings Important Questions
• NCERT Exemplar Class 9 Science Solutions for Chapter 1 – Matter in Our Surroundings

Chapter 2: Is Matter Around Us Pure?

This chapter of NCERT Class 9 Science students will teach about mixtures, solutions, properties of solutions, separation of mixtures, and physical and chemical changes. Along with this, they will also learn about compounds and their properties, the difference between mixtures and compounds, the classification of matter, etc.

Topics Covered in Class 9 Science Chapter 2 Is Matter Around Us Pure?  :

Nature of matter: Elements, compounds and mixtures. Heterogeneous and homogenous mixtures, colloids and suspensions. Physical and chemical changes (excluding separating the components of a mixture).

Also, access the following resources for Class 9 Chapter 2 Is Matter Around Us Pure? at BYJU’S:

• CBSE Class 9 Science Chapter 2 Is Matter Around Us Pure? Notes
• Important Questions for CBSE Class 9 Science Chapter 2 – Is Matter Around Us Pure?
• NCERT Exemplar Class 9 Science Solutions for Chapter 2 – Is Matter Around Us Pure?

Chapter 3: Atoms and Molecules

In NCERT Class 9 Science Chapter 3, students will learn the laws of chemical combination , atoms and molecules. They will get to know how to write a chemical formula, molecular mass and mole concepts and some numerical problems related to these concepts.

Topics Covered in Class 9 Science Chapter 3 Atoms and Molecules  :

Particle nature and their basic units: Atoms and molecules, Law of Chemical Combination, Chemical formula of common compounds, Atomic and molecular masses.

Also, access the following resources for Class 9 Chapter 3 Atoms and Molecules, at BYJU’S:

• Atoms And Molecules Class 9 Notes – Chapter 3
• Important Questions for Class 9 Science Chapter 3 – Atoms and Molecules
• NCERT Exemplar Class 9 Science Solutions for Chapter 3 – Atoms And Molecules

Chapter 4: Structure of the Atom

This chapter of NCERT Class 9 Science deals with the various atomic models of atoms that were proposed by different scientists. In addition to it, this chapter also covers electrons’ distribution in different orbits, calculation of valency , atomic number and mass number.

Topics Covered in Class 9 Science Chapter 4 Structure of the Atom  :

Structure of atoms: Electrons, protons and neutrons, Valency, Atomic Number and Mass Number, Isotopes and Isobars.

Also, access the following resources for Class 9 Chapter 4 Structure of the Atom at BYJU’S:

• Structure of the Atom Class 9 CBSE Notes – Chapter 4
• Important Questions of CBSE Class 9 Science Chapter 4 – Structure of the Atom
• NCERT Exemplar Class 9 Science Solutions for Chapter 4 – Structure of the Atom

Chapter 5: The Fundamental Unit of Life

This chapter is related to Biology. In this chapter, students will get to know that the cell is the fundamental unit of life. The whole chapter revolves around the cell and its structural organisation, in which students will learn about the plasma membrane , cell wall, nucleus, cytoplasm and structure of an animal cell.

Topics Covered in Class 9 Science Chapter 5 The Fundamental Unit of Life  :

Cell – Basic Unit of life: Cell as a basic unit of life; prokaryotic and eukaryotic cells, multicellular organisms; cell membrane and cell wall, cell organelles and cell inclusions; chloroplast, mitochondria, vacuoles, endoplasmic reticulum, Golgi apparatus; nucleus, chromosomes – basic structure, number.

Also, access the following resources for Class 9 Chapter 5 The Fundamental Unit of Life at BYJU’S:

• The Fundamental Unit of Life Class 9 CBSE Notes – Chapter 5
• Revision Notes For Class 9 Science Chapter 5 The Fundamental Unit of Life
• NCERT Exemplar Class 9 Science Solutions for Chapter 5 – The Fundamental Unit of Life

Chapter 6: Tissues

This chapter pertains to the basic definition of tissue and then elaborates on Plant and Animal tissue with proper diagrams. Students will get to know the different types of plant and animal tissues with a detailed explanation of each.

Topics Covered in Class 9 Science Chapter 6 Tissues  :

Tissues, Organs, Organ System, Organism: Structure and functions of animal and plant tissues (only four types of tissues in animals; Meristematic and Permanent tissues in plants).

Also, access the following resources for Class 9 Chapter 6 Tissues at BYJU’S:

• Tissues Class 9 CBSE Notes – Chapter 6
• Revision Notes For Class 9 Science Chapter 6 Tissues
• NCERT Exemplar Class 9 Science Solutions for Chapter 6 – Tissues

Chapter 7: Diversity in Living Organism

This chapter deals with the classification of plants and animals. Students get to know that all living organisms are divided into 5 kingdoms namely Monera, Protista, Fungi, Plantae and Animalia. It also describes the classification and evolution, the hierarchy of classification.

Also access the following resources for Class 9 Chapter 7 Diversity in Living Organism at BYJU’S:

• Diversity in Living Organisms Class 9 CBSE Notes – Chapter 7
• Important Questions for CBSE Class 9 Science Chapter 7 – Diversity in Living Organisms
• NCERT Exemplar Class 9 Science Solutions for Chapter 7 – Diversity In Living Organisms

Chapter 8: Motion

NCERT Class 9 Science Chapter 8 describes motion, the speed with direction, rate of change of velocity , and graphical representation of motion. Also, students will find the 3 equations of motion and numerical problems related to them. Overall, this chapter will be a mix of theory as well as the numerical part.

Topics Covered in Class 9 Science Chapter 8 Motion :

Motion: Distance and displacement, velocity; uniform and non-uniform motion along a straight line; acceleration, distance-time and velocity-time graphs for uniform motion and uniformly accelerated motion, elementary idea of uniform circular motion.

Also, access the following resources for Class 9 Chapter 8 Motion at BYJU’S:

• CBSE Class 9 Physics Motion Notes
• NCERT Exemplar Class 9 Science Solutions for Chapter 8 – Motion

Chapter 9: Force and Law of Motion

This chapter explains the 3 laws of motion with the help of diagrams and examples. Below are the 3 laws of motion:

• First law of motion: An object continues to be in a state of rest or of uniform motion along a straight line unless acted upon by an unbalanced force.
• Second law of motion: The rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force .
• Third law of motion: To every action, there is an equal and opposite reaction, and they act on two different bodies.

Topics Covered in Class 9 Science Chapter 9 Force and Law of Motion  :

Force and Newton’s laws: Force and Motion, Newton’s Laws of Motion, Action and Reaction forces, Inertia of a body, Inertia and mass, Momentum, Force and Acceleration.

Also, access the following resources for Class 9 Chapter 9 Force and Law of Motion at BYJU’S:

• Force and Laws Of Motion Class 9 CBSE Notes – Chapter 9
• Revision Notes For Class 9 Science Chapter 9 Force and Laws of Motion
• NCERT Exemplar Class 9 Science Solutions for Chapter 9 – Force and Laws Of Motion

Chapter 10: Gravitation

In chapter 10 of NCERT Class 9 Science, students will learn the universal law of gravitation and its importance, free fall, mass, weight, thrust and pressure, Archimedes’ principle and relative density. Students will also find numerical problems related to these topics.

Topics Covered in Class 9 Science Chapter 10 Gravitation :

Gravitation: Gravitation; Universal Law of Gravitation, Force of Gravitation of the earth (gravity), Acceleration due to Gravity; Mass and Weight; Free fall.

Floatation: Thrust and Pressure. Archimedes’ Principle; Buoyancy.

Also, access the following resources for Class 9 Chapter 10 Gravitation at BYJU’S:

• Gravitation Class 9 CBSE Notes – Chapter 10
• Revision Notes For Class 9 Science Chapter 10 Gravitation
• NCERT Exemplar Class 9 Science Solutions for Chapter 10 – Gravitation

Chapter 11: Work and Energy

In this chapter, the concept of work is defined with different activities, numerical and examples. The chapter also deals with energy and its different forms. Examples are given to explain all types of energy. The chapter ends with the topic “rate of doing work”.

Topics Covered in Class 9 Science Chapter 11 Work and Energy  :

Work, Energy and Power: Work done by a Force, Energy, power; Kinetic and Potential energy; Law of conservation of energy (excluding commercial unit of Energy).

Also, access the following resources for Class 9 Chapter 11 Work and Energy at BYJU’S:

• Work And Energy Class 9 CBSE Notes – Chapter 11
• Revision Notes For Class 9 Science Chapter 11 Work and Energy
• NCERT Exemplar Class 9 Science Solutions for Chapter 11 – Work And Energy

Chapter 12: Sound

Chapter 12 of CBSE Class 9 Science, deals with concepts such as the production of sound, propagation of sound, the reflection of sound, range of hearing, applications of ultrasound, and the structure of the human ear . A few numericals are also there in the chapter which can only be solved after understanding the concepts. So, students must grasp and study the chapter carefully.

Topics Covered in Class 9 Science Chapter 12 Sound :

Sound: Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo.

Also access the following resources for Class 9 Chapter 12 Sound at BYJU’S:

• CBSE Class 9 Science Chapter 12 Sound Notes
• Important Questions for CBSE Class 9 Science Chapter 12 – Sound
• NCERT Exemplar Class 9 Science Solutions for Chapter 12 – Sound

Chapter 13: Why Do We Fall Ill?

NCERT Class 9 Science chapter 13 deals with health issues and different types of diseases. It covers topics like; Health and its failure , disease and its cause, infectious diseases. This chapter is added to make students aware of different types of diseases so that they take care of their health and be fit and healthy.

Also access the following resources for Class 9 Chapter 13 Why Do We Fall Ill? at BYJU’S:

• Why Do We Fall Ill? Class 9 CBSE Notes – Chapter 13
• Important Questions for CBSE Class 9 Science Chapter 13 – Why Do We Fall Ill?
• NCERT Exemplar Class 9 Science Solutions for Chapter 13 – Why Do We Fall Ill?

Chapter 14: Natural Resources

We are blessed with natural resources. These are essential to meet the basic requirements of all forms of life on Earth. So, this chapter has been included by NCERT to provide knowledge on the types of resources available on the Earth. This chapter deals with the topics like air, water, soil, the biogeochemical cycle and the ozone layer, its importance and how humans are polluting them.

Also access the following resources for Class 9 Chapter 14 Natural Resources at BYJU’S:

• Natural Resources Class 9 CBSE Notes – Chapter 14
• Revision Notes For Class 9 Science Chapter 14 Natural Resources
• NCERT Exemplar Class 9 Science Solutions for Chapter 14 – Natural Resources

Chapter 15: Improvement in Food Resources

The last chapter of NCERT Class 9 Science covers topics like Improvement in crop yields, manure, fertilizer, storage of grains, and animal husbandry . This chapter provides knowledge regarding agriculture, farming and dairy.

Also access the following resources for Class 9 Chapter 15 Improvement in Food Resources at BYJU’S:

• Improvement in Food Resources Class 9 CBSE Notes – Chapter 15
• Important Questions for CBSE Class 9 Science Chapter 15 – Improvement in Food Resources
• Revision Notes For Class 9 Science Chapter 15 Improvement in Food Resources
• NCERT Exemplar Class 9 Science Solutions for Chapter 15 – Improvement In Food Resources

To download the complete book in PDF format, visit NCERT Science Book Class 9 . For more practice tests and mock tests, sign up on BYJU’S the learning app. Apart from Science, get NCERT Solutions for all the subjects. Students can download worksheets, assignments, NCERT Books , notes and study materials for exam preparation and for a better understanding of the topics.

CBSE Class 9 Science Evaluation Scheme (Theory) –

Features of NCERT 9 th Class Science Book Solutions

The book has a wide variety of features which are listed below:

• CBSE Class 9 Science NCERT Solutions are available to everyone for free.
• Covers all the exercise problems from the Class 9 textbook.
• Consists of extra questions, exemplar problems, the important questions from previous year question papers and sample papers, worksheets, MCQs, short answering questions, descriptive type questions, their solutions and tips and tricks.
• CBSE Class 9 Science Solutions files are available for download in PDF format for easy access.
• Diagrams are included to help students visualize the topics.
• Most effective solutions are given which can help to score well in the exams.

Frequently Asked Questions on NCERT Solutions for Class 9 Science

How many chapters are there in the ncert solutions for class 9 science , can i expect the questions from ncert solutions for class 9 science to be asked in the annual exam, is the ncert solutions for class 9 science sufficient for the exam preparation, why should students refer to the ncert solutions for class 9 science .

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