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Case Study and Passage Based Questions for Class 10 Science Chapter 10 Light Reflection and Refraction

• Last modified on: 1 year ago
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In CBSE Class 10 Science Paper, Students will have to answer some questions based on  Assertion and Reason . There will be a few questions based on case studies and passage based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Here, we have provided case based/passage based questions for Class 10 Science  Chapter 10 Light Reflection and Refraction .

Question 1:

Read the following and answer any four questions from (i) to (v).

The spherical mirror forms different types of images when the object is placed at different locations. When the image is formed on screen, the image is real and when the image does not form on screen, the image is virtual. When the two reflected rays meet actually, the image is real and when they appear to meet, the image is virtual.

A concave mirror always forms a real and inverted image for different positions of the object. But if the object is placed between the focus and pole. the image formed is virtual and erect.

A convex mirror always forms a virtual, erect and diminished image. A concave mirror is used as doctor’s head mirror to focus light on body parts like eyes, ears, nose etc., to be examined because it can form erect and magnified image of the object. The convex mirror is used as a rear view mirrors in automobiles because it can form an small and erect image of an object.

(i) When an object is placed at the centre of curvature of a concave mirror, the image formed is (a) larger than the object (b) smaller than the object (c) same size as that of the object (d) highly enlarged.

(ii) No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be (a) plane (b) concave (c) convex (d) either plane or convex.

(iii) A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top. (a) Plane, convex and concave (b) Convex, concave and plane (c) Concave, plane and convex (d) Convex, plane and concave

(iv) To get an image larger than the object, one can use (a) convex mirror but not a concave mirror (b) a concave mirror but not a convex mirror (c) either a convex mirror or a concave mirror (d) a plane mirror.

(v) A convex mirror has wider field of view because (a) the image formed is much smaller than the object and large number of images can be seen. (b) the image formed is much closer to the mirror (c) both (a) and (b) (d) none of these.

Question 2:

The lenses forms different types of images when object placed at different locations. When a ray is incident parallel to the principal axis, then after refraction, it passes through the focus or appears to come from the focus.

When a ray goes through the optical centre of the lens, it passes without any deviation. If the object is placed between focus and optical center of the convex lens, erect and magnified image is formed.

As the object is brought closer to the convex lens from infinity to focus, the image moves away from the convex lens from focus to infinity. Also the size of image goes on increasing and the image is always real and inverted.

A concave lens always gives a virtual, erect and diminished image irrespective to the position of the object.

(i) The location of image formed by a convex lens when the object is placed at infinity is (a) at focus (b) at 2F (c) at optical center (d) between Fand 2F

(ii) When the object is placed at the focus of concave lens, the image formed is (a) real and smaller (b) virtual and inverted (c) virtual and smaller (d) real and erect

(iii) The size of image formed by a convex lens when the object is placed at the focus of convex lens is (a) small (b) point in size (c) highly magnified (d) same as that of object

(iv) When the object is placed at 2F in front of convex lens, the location of image is (a) at F (b) at 2 F on the other side (c) at infinity (d) between F and optical center

(v) At which location of object in front of concave lens, the image between focus and optical centre is formed (a) anywhere between centre and infinity (b) at F (c) at 2F (d) infinity

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Case Study Questions Class 10 Science

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Download the app to get CBSE Sample Papers 2023-24, NCERT Solutions (Revised), Most Important Questions, Previous Year Question Bank, Mock Tests, and Detailed Notes.

Download Case study questions for CBSE class 10 Science in PDF format from the myCBSEguide App . We have the new pattern case study-based questions for free download. Class 10 Science case study questions

This article will guide you through:

What are case study questions?

• Sample Papers with Case Study questions
• Class 10 Science Case Study question examples
• How to get case-based questions for free?
• How to attempt the case-based questions in Science?

Questions based on case studies are some real-life examples. The questions are asked based on a given paragraph i.e. Case Study.  Usually, 4-5 questions are asked on the basis of the given passage. In most cases, these are either MCQs or assertion & reason type questions. Let’s take an example to understand. There is one paragraph on how nitrogen is generated in the atmosphere. On the basis of this paragraph, the board asks a few objective-type questions. In other words, it is very similar to the unseen passages given in language papers. But the real cases may be different. So, read this article till the end to understand it thoroughly.

What is CBE?

CBSE stands for competency-based education. The case study questions are part of this CBE. The purpose of CBE is to demonstrate the learning outcomes and attain proficiency in particular competencies.

Questions on Real-life Situations

As discussed the case study questions are based on real-life situations. Especially for grade 10 science, it is very essential to have the practical knowledge to solve such questions. Here on the myCBSEguide app, we have given many such case study paragraphs that are directly related to real-life implications of the knowledge.

Sample Papers with Case Study Questions

Class 10 Science Sample Papers with case study questions are available in the myCBSEguide App . There are 4 such questions (Q.No.17 to 20) in the CBSE model question paper. If you analyze the format, you will find that the MCQs are very easy to answer. So, we suggest you, read the given paragraph carefully and then start answering the questions. In some cases, you will find that the question is not asked directly from the passage but is based on the concept that is discussed there. That’s why it is very much important to understand the background of the case study paragraph.

CBSE Case Study Sample Papers

You can download CBSE case study sample papers from the myCBSEguide App or Student Dashboard. Here is the direct link to access it.

Case Study Question Bank

As we mentioned that case study questions are coming in your exams for the last few years. You can get them in all previous year question papers issued by CBSE for class 1o Science. Here is the direct link to get them too.

Class 10 Science Case Study Question Examples

As you have already gone through the four questions provided in the CBSE model question paper , we are proving you with other examples of the case-based questions in the CBSE class 10 Science. If you wish to get similar questions, you can download the myCBSEguide App and access the Sample question papers with case study-type questions.

Case-based Question -1

Read the following and answer any four questions: Salt of a strong acid and strong base is neutral with a pH value of 7. NaCl common salt is formed by a combination of hydrochloride and sodium hydroxide solution. This is the salt that is used in food. Some salt is called rock salt bed of rack salt was formed when seas of bygone ages dried up. The common salt thus obtained is an important raw material for various materials of daily use, such as sodium hydroxide, baking soda, washing soda, and bleaching powder.

• Phosphoric acid
• Carbonic acid
• Hydrochloric acid
• Sulphuric acid
• Blue vitriol
• Washing soda
• Baking soda
• Bleaching powder

Case-based Question -2

• V 1  + V 2  + V 3
• V 1  – V 2  +V 2
• None of these
• same at every point of the circuit
• different at every point of the circuit
• can not be determined
• 20 3 Ω 203Ω
• 15 2 Ω 152Ω

Case-based Question -3

• pure strips
• impure copper
• refined copper
• none of these
• insoluble impurities
• soluble impurities
• impure metal
• bottom of cathode
• bottom of anode

How to Attempt the Case-Based Questions in Science?

Before answering this question, let’s read the text given in question number 17 of the CBSE Model Question Paper.

All living cells require energy for various activities. This energy is available by the breakdown of simple carbohydrates either using oxygen or without using oxygen.

See, there are only two sentences and CBSE is asking you 5 questions based on these two sentences. Now let’s check the first questions given there.

Energy in the case of higher plants and animals is obtained by a) Breathing b) Tissue respiration c) Organ respiration d) Digestion of food

Now let us know if you can relate the question to the paragraph directly. The two sentences are about energy and how it is obtained. But neither the question nor the options have any similar text in the paragraph.

So the conclusion is, in most cases, you will not get direct answers from the passage. You will get only an idea about the concept. If you know it, you can answer it but reading the paragraph even 100 times is not going to help you.

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CBSE NCERT Solutions

NCERT and CBSE Solutions for free

Case Study Chapter 10 Light Reflection and Refraction

Please refer to Chapter 1 Light Reflection and Refraction Case Study Questions with answers provided below. We have provided Case Study Questions for Class 10 Science for all chapters as per CBSE, NCERT and KVS examination guidelines. These case based questions are expected to come in your exams this year. Please practise these case study based Class 10 Science Questions and answers to get more marks in examinations.

Case Study Questions Chapter 1 Light Reflection and Refraction

Case/Passage – 1 A 5.0 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm.

Question: What is the power of the used lens? (a) + 5 D (b) – 5 D (c) + 0.5 D (d) – 0.5 D   

Question: What is the distance of image from the pole of lens? (a) v = 60 cm (b) v = – 60 cm (c) v = 30 cm (d) v = –30 cm 

Case/Passage – 2

Light travels through a vacuum at a speed c = 3 × 108 m/s. It can also travel through many materials, such as air, water and glass. Atoms in the material absorb, reemit and scatter the  light, however. Therefore, light travels through the material at a speed that is less than c, the actual speed depending on the nature of the material. To describe the extent to which  the speed of light in a material medium differs from that in a vacuum, we use a parameter called the index of refraction (or refractive index).

Question: Figure shows a ray of light as it travels from medium A to 

medium B. Retractive index of the medium B relative to medium A is (a) √3/2 (b)√2/3 (c)√1/2 (d) √2

Question:The path of a ray of light coming from air passing through a rectangular glass slab traced by four students shown as A, B, C and D in the figure. Which one of them is correct?

(a) A (b) B (c) C (d) D   

Question: A light ray enters from medium A to medium B as shown  

in the figure. The refractive index of medium B relative to A will be  (a) greater than unity (b) less than unity (c) equal to unity (d) zero

Question: You are given water, mustard oil, glycerine and kerosene.  In which of these media, a ray of light incident obliquely at same angle would bend the most? (a) Kerosene (b) Water (c) Mustard oil (d) Glycerine   

Question: A ray of light is incident in medium 1 on a surface that separates medium 1 from medium 2. Let v1 and v2 represent the velocity of light in medium 1 and medium 2 respectively. Also let n12 and n21 represent the refractive index of medium 1 with respect to medium 2 and refractive index of medium 2 with respect to medium 1, respectively. If i and r denote the angle of incidence and angle of refraction, then- (a) sin i/sin r = n 21 V 1 /V 2 (b) sin i/sin r = n 21 V 2 /V 1 (c) sin i/sin r = n 12 V 1 /V 2 (d) sin i/sin r = n 12  V 2 /V 1   

Case/Passage – 3 Inside a substance such as glass or water, light travels more slowly than it does in a vacuum. If c denotes the speed of light in a vacuum and v denotes its speed through some other substance, then v = c/n where n is a constant called the index of refraction. To good approximation, a substance’s index of refraction does not depend on the wavelength of light. For instance, when red and blue light waves enter water, they both slow down by about the same amount. More precise measurements, however, reveal that n varies with wavelength. Table presents some indices of refraction of Custon glass, for different wavelengths of visible light. A nanometer (nm) is 10– 9  meters. In a vacuum, light travels as c = 3.0 × 10 8  m/s 

Question: Inside Custon glass (a) Orange light travels faster than yellow light (b) Yellow light travels faster than orange light (c) Orange and Yellow light travels equally fast (d) We cannot determine which color of light travels faster 

Question: Which of the following phenomena happens because n varies with wavelength (a) A lens focuses light (b) A prism breaks sunlight into different colors (c) Total internal reflections ensures that light travels down a fiber optic cable (d) Light rays entering a pond change direction at the pond’s surface 

Question: For blue-green of wavelength 520 nm, the index of refraction of Custon glass is probably closest to (a) 1.49 (b) 1.50 (c) 1.51 (d) 1.52 

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CBSE 10th Standard Science Subject Light Reflection and Refraction Chapter Case Study Questions With Solution 2021

By QB365 on 21 May, 2021

QB365 Provides the updated CASE Study Questions for Class 10 , and also provide the detail solution for each and every case study questions . Case study questions are latest updated question pattern from NCERT, QB365 will helps to get  more marks in Exams 

QB365 - Question Bank Software

Cbse 10th standard science subject light reflection and refraction case study questions with solution 2021.

10th Standard CBSE

Final Semester - June 2015

The curved surface of a spoon can be considered as a spherical mirror. A highly smooth polished surface is called mirror. The mirror whose reflecting surface is curved inwards or outwards is called a spherical mirror. Inner part works as a concave mirror and the outer bulging part acts as a convex mirror. The center of the reflecting surface of a mirror is called pole and the radius of the sphere of which the mirror is formed is called radius of curvature. (i) When a concave mirror is held towards the sun and its sharp image is formed on a piece of carbon paper for some time, a hole is burnt in the carbon paper. What is the name given to the distance between the mirror and carbon paper?

(ii) The distance between pole and focal point of a spherical mirror is equal to the distance between

(iii) The focal length of a mirror is 15 cm. The radius of curvature is

(iv) The normal at any point on the mirror passes through

(v) In a convex spherical mirror, reflection of light takes place at

The spherical mirror forms different types of images when the object is placed at different locations. When the image is formed on screen, the image is real and when the image does not form on screen, the image is virtual. When the two reflected rays meet actually, the image is real and when they appear to meet, the image is virtual. A concave mirror always forms a real and inverted image for different positions of the object. But if the object is placed between the focus and pole, the image formed is virtual and erect. A convex mirror always forms a virtual, erect and diminished image. A concave mirror is used as doctor's head mirror to focus light on body parts like eyes, ears, nose etc., to be examined because it can form erect and magnified image of the object. The convex mirror is used as a rear view mirrors in automobiles because it can form an small and erect image of an object. (i) When an object is placed at the centre of curvature of a concave mirror, the image formed is

(ii) No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

(iii) A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.

(iv) To get an image larger than the object, one can use (a) convex mirror but not a concave mirror (b) a concave mirror but not a convex mirror (c) either a convex mirror or a concave mirror (d) a plane mirror. (v) A convex mirror has wider field of view because (a) the image formed is much smaller than the object and large number of images can be seen (b) the image formed is much closer to the mirror (c) both (a) and (b) (d) none of these.

The relation between distance of an object from the mirror (u), distance of image from the mirror (v) and the focal length (F) is called mirror formula. This formula is valid in all situations for all spherical mirrors for all positions of the object. The size of image formed by a spherical mirror depends on the position of the object from the mirror. The image formed by a spherical mirror can be bigger than the object, equal to the object or smaller than the object. The size of the image relative to the object is given by the linear magnification (m). Thus, the magnification is given by the ratio of height of image to the height of object. If magnification is negative, image is real and if it is positive, image is virtual. (i) What is the position of an image when an object is placed at a distance of 20 em from a concave mirror of focal length 20 cm?

(iii) If the magnification of an image is -2, the characteristic of image will be

(iv) The mirror formula holds for

(v) A parallel beam of light is made to fall on a concave mirror. An image is formed at a distance of7.5 from the mirror. The focal length of the mirror is

(ii) A ray of light passes from a medium A to another medium B. No bending of light occurs if the ray of light hits the boundary of medium B at an angle of

(iii) When light passes from one medium to another, the frequency of light

(iv) When light passes from glass to water, the speed of light

(v) The bottom of pool filled with water appears to be ______ due to refraction of light

*****************************************

Cbse 10th standard science subject light reflection and refraction case study questions with solution 2021 answer keys.

(i) (d) : When an object is placed at the focus of a concave mirror, the..image is formed at infinity. (ii) (d) : When a light ray parallel to the principal axis is incident on a concave mirror, it passes through the principal focus after reflection. Therefore, figure D is correct. (iii) (a) : If m is negative, the image will be real and inverted. (iv) (d) (v) (b): The distance of object from mirror =  \(\infty\) Using,  \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\) \(\frac{1}{\infty}-\left(-\frac{1}{7.5}\right)=\frac{1}{f}\) f = 7.5 cm

(i) (a): When, a ray of light travels from air to glass, it bends towards the normal. (ii) (c): No bending of light occurs when light is incident normally or perpendicularly on a boundary of two media since angle of incidence and angle of refraction both are zero. (iii) (c): When light goes from one medium to other medium, its frequency does not change (iv) (a): The speed to light increases when light passes from glass to water as water is optically rarer medium. (v) (a): The bottom of a pool of water appears to be less deep than it actually is due to refraction.

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CBSE Class 10 Physics Chapter 10 Important Questions and Answers for 2023

Cbse class 10 physics chapter 10 important questions and answers : get the important questions with answers for cbse class 10 science chapter 10 light reflection and refraction. use these along with other cbse resources to score good marks..

CBSE Class 10 Physics Chapter 10 Important Questions and Answers: In this article we are going to cover the Multiple Choice Questions, Very Short Answer Questions, Short Answer Questions, Case Study Questions, Long Answer Questions and even Assertion Reason questions that are important for CBSE Class 10 Science Board Examination 2023. These questions are from the tenth chapter of the third unit of the syllabus - Natural Phenomena. 

The answers to the questions are also available. Scroll down to the end of the questions to check your answers.

Important Questions for CBSE Class 10 Science Chapter 10 Light Reflection and Refraction

Multiple choice questions.

Q.1. Rays from the sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that the size of its image is equal to the size of the object?

(a) 15 cm in front of the mirror

(b) 30 cm in front of the mirror

(c) between 15 cm and 30 cm in front of the mirror

(d) more than 30 cm in front of the mirror

Q.2. No matter how far you stand from a mirror, your image appears erect. The mirror islikely to be

(a) Plane 

(b) Concave 

(c) Convex 

(d) Either plane or convex

Q.3. You are given water, mustard oil, glycerine and kerosene. In which of these media, a ray of light incident obliquely at same angle would bend the most?

(a) Kerosene 

(b) Water 

(c) Mustard oil 

(d) Glycerine

Q.4. As light travels from a rarer to a denser medium it will have

(a) Increased velocity 

(b) Decreased velocity

(c) Decreased wavelength 

(d) both (b) and (c)

Q.5. How will the image formed by a convex lens be affected if the upper half of the lens is wrapped with a black paper?

(a) The size of the image is reduced to one-half.

(b) The upper half of the image will be absent.

(c) The brightness of the image is reduced.

(d) There will be no effect

Q.6. The velocity of light is maximum in a medium of

(a) glass 

(b) water 

(c) vacuum 

(d) diamond

Q.7. A full length image of a distant tall building can definitely be seen by using:

(a) a concave mirror 

(b) a convex mirror

(c) a plane mirror 

(d) both concave as well as plane mirror

8. A student conducts an activity using a flask of height 15 cm and a concave mirror. He finds that the image formed is 45 cm in height. What is the magnification of the image?

(a) 45 times 

(b) 1/ 45 times 

(c) 1/ 3 times 

(d) 3 times

Q.9. A student determines the focal length of a device 'X' by focusing the image of a distant object on a screen placed 20 cm from the device on the same side as the object. The device 'X' is

(a) Concave lens of focal length 10 cm 

(b) Convex lens of focal length 20 cm

(c) Concave mirror of focal length 10 cm 

(d) Concave mirror of focal length 20 cm

Q.10.. A student conducts an experiment using a convex lens of focal length 20 cm and an object of height 15 cm. He placed the object at 25 cm from the lens. Can the image be formed on a screen?

(a) yes, because a real image will be formed

(b) no, because a virtual image will be formed

(c) yes, because an erect image will be formed

ASSERTION AND REASON

Directions: In the following questions, a statement of assertion (A) is followed by a

statement of reason (R). Mark the correct choice as:

(a) If both assertion and reason are true and reason is the correct explanation of assertion

(b) If both assertion and reason are true but reason is not the correct explanation of assertion

(c) If assertion is true but reason is false.

(d) If both assertion and reason are false.

Q.1. Assertion: A ray incident along normal to the mirror retraces its path.

Reason: In reflection, angle of incidence is always equal to angle of reflection.

2. Assertion: A convex lens is made of two different materials. A point object is placed on the principal axis. The number of images formed by the lens will be two.

Reason :The image formed by convex lens is always virtual.

Q.3. Assertion: When a concave mirror is held in water, its focal length will decrease.

Reason: The focal length of a concave mirror depends on the density the medium in Which it is placed.

Q.4. Assertion: Full length image of a distant object, such as a tall building, can be seen in a convex mirror.

Reason: A convex mirror has a greater focal length than a concave mirror of the same aperture.

Q.5. Assertion: Higher is the refractive index of the medium, lesser is the velocity of light in that medium.

Case Study Based Questions

Q.1. Light is a form of energy which induces sensation of vision to our eyes. It becomes visible when it bounces off on surfaces and hits our eyes. The phenomenon of bouncing back of light rays in the same medium on striking a smooth surface is called reflection of light. If parallel beam of incident rays remains parallel even after reflection and goes only in one direction is known as regular reflection. It takes place mostly in plane mirrors or highly polished metal surfaces. The mirror outside the driver side of a vehicle is usually a spherical mirror and printed on such a mirror is usually the warning "vehicles in this mirror are closer than they appear."

a) Plane mirror 

(b) Concave mirror

(c) Convex mirror 

(d) Magic mirror

(ii) No matter how far you stand from a mirror, your image appears erect. The mirror can be

(b) Concave

(c) convex 

(iv) If an object is placed at 10 cm from a convex mirror of radius of curvature 60 cm, then find the position of image.

(a) 4 cm 

(c) 10 cm 

(d) 12.5 cm

(v) The focal length of mirror is 12 cm. The radius of curvature is

(a) 12 cm 

(c) 20 cm 

Q.2. We know that lenses form different types of images when objects are kept at varying positions. When a ray is incident parallel to the principal axis, then after refraction, it passes through the focus or appears to come from the focus.When a ray goes through the optical centre of the lens, it passes without any deviation. If the objectis placed between the focus and optical center of the convex lens, erect and magnified image is formed. As the object is brought closer to the convex lens from infinity to focus, the image moves away from the convex lens from focus to infinity. Also the sizeof the image goes on increasing and the image is always real and inverted. A concave lens always gives a virtual, erect and diminished image irrespective of the position of the object.

i. The location of image formed by a convex lens when the object is placed at infinity is

(a) at focus 

(b) at 2F 

(c) at optical center 

(d) betweenFand 2F

ii. When the object is placed at the focus of concave lens, the image formed is

(a)real and smaller 

(b) virtual and smaller

(c) virtual and inverted 

(d) real and erect

iii. The size of image formed by a convex lens when the object is placed at the focus of convex lens is

(a) highly magnified 

(b) point in size

(c) small 

(d) same as that of object

iv. When the object is placed at 2F in front of convex lens, the location of image is

(a) at F 

(b) between F and optical center

(c) at infinity 

(d) none of the above

Q.3. The refractive index of a medium with respect to vacuum is called the absolute refractive index of the medium. It is given by, μ = sin i/sinr

i) How is absolute refractive index related to speed of light?

(a)μ = C/vm 

(c)μ=Vm 

(ii) In which of the materials given in the above table, light travels fastest?

(a) A 

(c) C 

(iii) The speed of light in air is 3x108 ms-1 and that in medium A is 2.5 x 10 ms-1. The refractive index of A will be 

(a) 1.2 

(c)4.5 

(iv) When light travels from air to glass,

(a) angle of incidence > angle of refraction

(b) angle of incidence < angle of refraction

(c) angle of incidence = angle of refraction

(d) Can't say

(v) The refractive index of P with respect to Qis 2. Find the refractive index of Q with respect to P.

(a) 0.5 

(c) 2 

VERY SHORT ANSWER QUESTIONS (2 marks)

Q.1. If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it?

 Draw a labelled ray diagram to support your answer.

Q.2. State the two laws of reflection of light.

Q.3. State the laws of refraction of light. Explain the term absolute refractive index of a medium’ and write an expression to relate it with the speed of light in vacuum.

Q.4. A fish under water is viewing obliquely a fisherman standing on the bank of lake.Does the man look taller or shorter?

Q.5. Which phenomenon occurs when light falls on

(a) highly polished surface

SHORT ANSWER TYPE QUESTIONS (3 MARKS)

Q.1. A concave mirror has a focal length of 20 cm. At what distance from the mirror should a 4 cm tall object be placed so that it forms an image at a distance of 30 cm from the mirror? Also calculate the size of the image formed.

Q.2. (a) Water has refractive index 1.33 and alcohol has refractive index 1.36. Which of the two medium is optically denser? Give reason for your answer.

(b) Draw a ray diagram to show the path of a ray of light passing obliquely from water to alcohol.

(c) State the relationship between angle of incidence and angle of refraction in the above case. 

Q.3. Three mirrors, one plane, one concave and one convex are lying on the table. identify them without touching them or using any other apparatus or device? 

Q.4. A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in closed contact with each other. Calculate the lens power of the combination.

Q.5. An object is placed at a distance of 12 cm in front of a concave mirror of radius ofcurvature 30 cm. List four characteristics of the image formed by the mirror

Q.6. A convex lens of focal length 2.0 m can produce a magnified virtual as well as real image. Is this a correct statement? If yes, where shall the object be placed in each case for obtaining these images?

LONG ANSWER TYPE QUESTIONS  (4 MARKS)

Q.1. (i) A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

(ii) A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.

Q.2. (a) A 5 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. Find the position, nature and size of the image formed.

Answers to Important Questions for CBSE Class 10 Science Chapter 10 Light Reflection and Refraction

Unit III: Natural Phenomena

Answer- (b) 30 cm in front of the mirror

Answer- (d) Either plane or convex

Answer- (d) Glycerine

Answer- (b) Decreased velocity

Answer- (c) The brightness of the image is reduced.

Answer- (c) vacuum 

Answer- (b) a convex mirror

Answer- (d) 3 times

Answer- (d) Concave mirror of focal length 20 cm

(d)No because the image is

Answer- (a)

Answer- (c) 

Answer- (d) 

Reason: Refractive index of a medium is inversely proportional to the velocity of light.

Case Study Based Questions:

(i) Which type of mirror is used outside the driver's side of a vehicle?

(iii) If an object is placed at 10 cm from a convex mirror of radius of curvature 60 cm, then find the position of image.

(iv) The focal length of the mirror is 12 cm. The radius of curvature is

Q.2. We know that lenses form different types of images when objects are kept at varying positions. When a ray is incident parallel to the principal axis, then after refraction, it passes through the focus or appears to come from the focus.When a ray goes through the optical centre of the lens, it passes without any deviation. If the object is placed between the focus and optical center of the convex lens, erect and magnified image is formed. As the object is brought closer to the convex lens from infinity to focus, the image moves away from the convex lens from focus to infinity. Also the sizeof the image goes on increasing and the image is always real and inverted. A concave lens always gives a virtual, erect and diminished image irrespective of the position of the object.

i The location of image formed by a convex lens when the object is placed at infinity is

(d) between Fand 2F

ii When the object is placed at the focus of concave lens, the image formed is

iii The size of image formed by a convex lens when the object is placed at the focus of convex lens is

iv When the object is placed at 2F in front of convex lens, the location of image is

(a)at F 

Answer- If the image formed by a spherical mirror is always erect and diminished then it is convex mirror.

Laws of reflection of light states that

(i) The angle of incidence is equal to the angle of reflection.

(ii) The incident ray, the reflected ray and the normal to the mirror at the point of incidence all lie in the same plane.

Q.3. State the laws of refraction of light. Explain the term absolute refractive index of a

medium’ and write an expression to relate it with the speed of light in vacuum.

Answer- (a) Laws of refraction of light:

(i) The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane.

(ii) The ratio of sine of angle of incidence to the sine of the angle of refraction is constant, for the light of a given colour and for the given pair of media.

This law is also known as Snell’s law of refraction.

sini/sinr = constant,

where i is the angle of incidence and r is the angle of refraction.

This constant value is called refractive index of the second medium with respect to the first when the light travels from first medium to second medium.

⇒ constant = n21 = v1/v2 ∴sini/sinr = v1/v2

If n is the absolute refractive index of the medium, c is the velocity of light in vacuum and v is the speed of light in a given medium, then n = c/v.

Ans. As light travels from rarer to denser medium, it bends towards normal and appears to come from greater height. Therefore, to fish under water, man looks taller.

(b) a transparent medium? 

Ans. (a) Reflection of light. 

Answer- Given f = -20 cm v = -30 cm, u = ?

Using 1/v + 1/u = 1/f

1/u = 1/f – 1/v = 1/(−20) – /(−30) = (−3+2)/60

⇒ u = -60 cm

∴ Object placed at 60 cm from the mirror.

Also magnification, m = h′/h = −v/u

⇒ h’ = −(−30)/−60 × 4 = -2 cm

∴ The size of the image is 2 cm.

Answer- (a) Here, alcohol is optically denser medium as its refractive index is higher than that of water. When we compare the two media, the one with larger refractive index is called the optically denser medium than the other as the speed of light is lower in this medium.

(b) Since light is travelling from water (rarer medium) to alcohol (denser medium), it slows down and bends towards the normal.

where i = angle of incidence and r = angle of refraction.

(c) According to Snell’s law,

sini/sinr=μalcohol /μwater =1.36/1.33 = 1.0225

∴ sin i = 1.0225 × sin r

Ans. Plane mirror produces the image of same size. Concave mirror produced the magnified image while the convex mirror will produce a diminished image

f1=25cm=0.25 m 

f2= -10cm= - 0.1m

Power of convex lens, P1 = 1/f1=1/0.25=+4D

Power of concave lens, P2 = 1/f2=1/ - 0.1m=-10D

power of combination, P = P1 +P2 = 4D – 10D = -6D

Ans: Radius of curvature (R) = 30 cm, object distance is 12 cm in front of the mirror.Thus we can say that object is placed between focus and pole. Four characteristics of the image formed by die given concave mirror when object is placed between pole and focus are:

(i) Virtual 

(iii) Enlarged 

(iv) Image is formed behind the mirror

Ans: Yes, it is correct. If the object is placed within 2.0 m from the lens in the it forms magnified virtuaL image Between 2 m and 4 m it will form a real inverted and magnified image.

Q.7. “The magnification produced by a spherical mirror is -3”. List all information youobtain from this statement about the mirror/ image.

LONG ANSWER TYPE QUESTIONS

(b) Draw a labelled ray diagram showing object distance, image distance and focal length in the above case.

Answer- (a) Given, h = 5 cm, f = 20 cm, u = -30 cm

Using lens formula, 1/v – 1/u = 1/f

1/v=1/u+1/f=1/(−30)+1/20=(−2+3)/60=1/60

⇒ v = 60 cm

Now, magnification, m = h′/h = v/u

⇒ h’ = v/u × h = 60/(−30) × 5 = -10 cm

Hence, the image formed at 60 cm, which is real and magnified.

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Case Study Questions Class 10 Science Magnetic Effects of Electric Current

Case study questions class 10 science chapter 13 magnetic effects of electric current.

CBSE Class 10 Case Study Questions Science Magnetic Effects of Electric Current. Term 2 Important Case Study Questions for Class 10 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Magnetic Effects of Electric Current.

At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks.

CBSE Case Study Questions Class 10 Science Magnetic Effects of Electric Current

Case Study – 1

Andre Marie Ampere suggested that a magnet must exert an equal and opposite force on a current carrying conductor, which was experimentally found to be true. But we know that current is due to charges in motion. Thus, it is clear that a charge moving in a magnetic field experience a force, except when it is moving in a direction parallel to it. If the direction of motion is perpendicular to the direction of magnetic field, the magnitude of force experienced depends on the charge, velocity (v) , strength of magnetic field(B), and sine of the angle between v and B.

(a) Direction of magnetic force is given by which rule?

Answer- Fleming’s left hand rule.

(b) Write the statement of the rule?

Answer- It states that if we stretch thumb, forefinger or the index finger and the middle finger in such a way that they are mutually perpendicular to each other then the thumb gives the direction of the motion or the force acting on conductor, index finger gives the direction of magnetic field and the middle finger gives the direction of current.

Case Study – 2

Two coils C1 and C2 are wrapped around a non-conducting cylinder. Coil C1 is connected to a battery and key and C2 with galvanometer G. On pressing the key (K), current starts flowing in the coil C1.

State your observation in the galvanometer.

• (a) When key K is pressed on.
• (b) When current in the coil C1 is switched off.
• (c) When the current is passed continuously through coil C1 .
• (d) Name and state the phenomenon responsible for the above observation.

a.) The galvanometer needle deflects momentarily in one direction.

b.) The galvanometer needle deflects again momentarily but in opposite direction to that in the previous case.

c.) No deflection.

d) Electromagnetic induction.

Explanation- Electromagnetic induction is a process by changing a magnetic field in a conductor, which induces a current in another conductor placed in nearby.

Case Study – 3 

It is well known that “magnetic field is caused by electric current. ”Whenever there is a change in magnetic flux linked with a coil (or circuit) an emf is induced in the coil. This phenomenon is called electromagnetic induction. The emf produced in the coil is called the induced emf.If the coil is closed, the current thus produced is called as induced current. The direction of induced current is determining by Fleming’s right hand rule. These induced current are used in a moving coil microphone, tape-recorders, video recorders, hard-discs in computers etc.

Based on the above information, answer the following questions

(a) State Faraday’s law of electromagnetic induction.

Ans – When we linked magnetic field lines with a coil due to relative motion of a magent and the coil, then an induced current produced in the coil. The magnet of induced current is directly proportional. The rate of change of number of magnetic field lines to the coil.

(b) State any two methods of inducing current in a coil.

Answer- Current can be induced in a coil by

• Rotating a coil within a magnetic field.
• Moving a coil towards or away from a magnet
• Moving a magnet towards or away from the coil

Case Study – 4

A student connects a coil of wire with a sensitive galvanometer as shown in figure. Where should the bar magnet be placed to cause the deflection in the galvanometer.

Answer- The bar magnet should be moved towards or away from the coil and parallel to the axis of the coil.

Case study: 4

The change in electric current through the circuit produces magnetic field around it. Magnetic field is a vector quantity which has both magnitude as well as direction. The magnetic field lines produced are directed from north pole and ends at south pole. These lines are closed curves from which strength of the magnetic field is determined. Where magnetic field lines are crowded magnetic field is stronger and where very apart the strength of magnetic field is weak. So, we can say that as the current through the electrical circuit increase then the magnitude of magnetic field also increases. If a current carrying conductor is holded in right hand by curling figures around it. Then, the curled figures gives the direction of electric current and curled figures gives the direction of magnetic field.

As the magnitude of magnetic field depends on the current through it. Also, if the number of turns of wire in a circuit is more then also the magnitude of magnetic field is more. If a coil having many circular turns of insulated copper wire wound closely to form a cylindrical shape is called as solenoid. Solenoid is used to produce strong magnetic field which can be used to magnetise the piece of magnetic material. And hence they are used in making electromagnet mainly.

1) What is the nature of magnetic field lines inside the solenoid?

2) For what right hand thumb rule is used?

3) What are the properties of magnetic poles?

1) Inside the solenoid the magnetic field lines are parallel straight lines and the magnetic field inside the solenoid is uniform.

2) The right hand thumb rule is used to find the direction of electric current which given by the thumb.

3) The like poles of a magnet repels each other and the unlike poles of magnet attract each other.

Case study: 5

If we stretched the thumb, forefinger and middle finger of our left hand so that they are mutually perpendicular to each other. If the forefinger gives the direction of magnetic field and middle finger gives the direction of electric current then the thumb gives the direction of motion or the force acting on the conductor.

Electric motor is used to convert electric energy into mechanical energy. It is mostly used in electric fans, refrigerators, mixers, washing machine, computers etc.

The commercial motor uses an electromagnet in place of permanent magnet, large number of turns of the conducting wire in the current carrying coil, a soft iron core on which the coil is wound. If we stretched the thumb, forefinger and middle finger of right hand so that they are mutually perpendicular to each other. If the forefinger gives the direction of magnetic field and thumb gives the direction of motion of conductor then the middle finger gives the direction of induced current. And this rule is called as Fleming’s right hand rule.

Electric generator is used to convert mechanical energy into electrical energy.The direct current always flows in one direction while the alternating current changes its direction periodically. The frequency of AC in India is 50 Hz.

1) Which is the important advantage of AC over DC?

2) Electric generator works on the phenomenon of?

3) Fleming’s right hand rule is used for ?

4) The phenomenon of electromagnetic induction was discovered by?

1) The important advantage of AC over DC is that electric power can be transmitted over long distances without more loss of energy.

2) Electric generator is based on the phenomenon of electromagnetic induction.

3) Fleming’s right hand rule is used to find the direction of induced current.

4) The phenomenon of electromagnetic induction was discovered by Michael Faraday.

Case study: 6

The domestic electric circuit consist of red insulated cover called as live wire, wire with black insulation called as neutral wire and the wire with green insulation is called as Earth wire. We know that fuse is connected in series with the circuit to prevent the damaging of electrical appliances and circuit from overloading. Overloading occurs when live wire and the neutral wire comes in direct contact with each other. Because of which current through the circuit increases suddenly. Also, overloading may occurs because of connecting many appliances to a single socket. The Earth wire which is green in colour is connected to a metal plate deep in the earth near the house. This type of safety measure is used in appliances like electric press, toaster, table fan, refrigerator etc. The Earth wire is gives low resistance conducting path for the electric current. In this way it protects us from severe electric shock.

All the appliances are connected in parallel circuit so that the potential difference across each appliance will be same.

1) What are the signs of live wire and neutral wire?

2) In our country what is the potential difference between live wire and neutral wire?

3) What is short circuiting?

4) What is the main purpose of using fuse in electric circuit?

1) The red insulated wire is the live wire or positive and the black insulated wire is the neutral wire or negative.

2) In our country the potential difference between live wire and neutral wire is 220 V.

3) When live wire and neutral wire comes in direct contact, in that situation the current through the circuit increases suddenly and it is called as short circuiting.

4) Because of Joule’s heating effect the heat produced causes the fuse to melt and to break the circuit. And thereby protect the circuit and electric appliances.

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Case Study Questions Class 10 Science Chapter 13 Magnetic Effects of Electric Current

• Post author: studyrate
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Case study Questions Class 10 Science Chapter 13  are very important to solve for your exam. Class 10 Science Chapter 13 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving case study-based questions for Class 10 Science Chapter 13 Magnetic Effects of Electric Current

Join our Telegram Channel, there you will get various e-books for CBSE 2024 Boards exams for Class 9th, 10th, 11th, and 12th.

In CBSE Class 10 Science Paper, Students will have to answer some questions based on  Assertion and Reason . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Magnetic Effects of Electric Current Case Study Questions With answers

Here, we have provided case-based/passage-based questions for Class 10 Science  Chapter 13 Magnetic Effects of Electric Current

Case Study/Passage Based Questions

Question 1:

An electric motor is a rotating device that converts electrical energy into mechanical energy electric motors are used as an important component in electric fans, refrigerators, mixer, washing machines, computers, MP3 players etc. Motor Works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it, a force acts on the coil which rotates it continuously. When the coil rotates the shaft attached to it also rotates. In this way the electrical energy supplied to the motor is converted into the mechanical energy of rotation.

1.1) When the current is switched on, an electric fan converts : (a) electrical energy into mechanical energy (b) chemical energy into mechanical energy (c) electrical energy into mechanical energy (d) mechanical energy into electrical energy

Answer: (c) electrical energy into mechanical energy

1.2) In an electric motor, the direction of current in the coil changes once in each (a) two rotations (b) one rotation (c) half rotation (d) one-fourth rotation

Answer: (c) half rotation ​

1.3) An electron beam enters a magnetic field at right angles to it. The direction of force acting on the electron beam will be : (a) to the right (b) to the left (c) into the page (d) out of the page

Answer: (c) into the page​​

1.4) A magnetic field exerts no force on : (a) an unmagnetised iron bar (b) a stationary electric charge (c) a magnet (d) an electric charge moving perpendicular to its direction

Answer: (b) a stationary electric charge

1.5) Which of the following has no effect on the size of the turning effect on the coil of an electric motor? (a) The amount of the current in the coil. (b) The number of turns in the coil. (c) The direction of the current in the coil. (d) The strength of the magnetic field.

Answer: (c) The direction of the current in the coil

Question 2:

An insulated copper wire wound on a cylindrical cardboard tube such that its length is greater than its diameter is called a solenoid. When an electric current is passed through the solenoid, it produces a magnetic field around it. The magnetic field produced by a current-carrying solenoid is similar to the magnetic field produced by a bar magnet. The field lines inside the solenoid are in the form of parallel straight lines. The strong magnetic field produced inside a current-carrying solenoid can be used to magnetize a piece of a magnetic material like soft iron when placed inside the solenoid. The strength of the magnetic field produced by a current-carrying solenoid is directly proportional to the number of turns and strength of the current in the solenoid.

(i) The strength of magnetic field inside a long current-carrying straight solenoid is (a) more at the ends than at the centre (b) minimum in the middle (c) same at all points (d) found to increase from one end to the other.

Answer: (c) same at all points

(ii) The north-south polarities of an electromagnet can be found easily by using

Answer: (c) Clock face rule ​

(iii) For a current in a long straight solenoid N-and S-poles are created at the two ends. Among the following statements, the incorrect statement is (a) The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid. (b) The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil. (c) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet. (d) The N- and S-poles exchange position when the direction of current through the solenoid is reversed.

Answer: (c) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet. ​

(iv) A long solenoid carrying a current produces a magnetic field B along its axis. If the current is double and the number of turns per cm is halved, then new value of magnetic field is

Answer: (a) B ​

Answer: (a) N-pole ​

Question 3:

(i) Choose incorrect statement from the following regarding split rings. (a) Split rings are used to reverse the direction of current in coil. (b) Split rings are also known as commutator. (c) Split ring ii a discontinuous or a broken ring. (d) Both (a) and (b)

Answer: (d) Both (a) and (b) ​

(ii) Which of the following has no effect on the size of the turning effect on the coil of an electric motor?

Answer: (b) The direction of the current in the coil. ​

(iii) When current is switched ON, an electric fan converts

Answer: (b) electrical energy to mechanical energy ​

(iv) In an electric motor, device that makes contact with the rotating rings and through them to supply current to coil is

Answer:(b) brushes ​

(v) In an electric motor, the direction of current in the coil changes once in each

Answer:(c) half rotation ​

Hope the information shed above regarding Case Study and Passage Based Questions for Class 10 Science Chapter 13 Magnetic Effects of Electric Current with Answers Pdf free download has been useful to an extent. If you have any other queries of CBSE Class 10 Science Magnetic Effects of Electric Current Case Study and Passage Based Questions with Answers, feel free to comment below so that we can revert back to us at the earliest possible By Team Study Rate

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Class 10 Science: Case Study Chapter 10 Light Reflection and Refraction PDF Download

In CBSE Class 10 Science Paper, Students will have to answer some questions based on  Assertion and Reason . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given.

Here we are providing you with Class 10 Science Chapter 10 Light Reflection and Refraction Case Study Questions, by practicing these Case Study and Passage Based Questions will help you in your Class 10th Board Exam.

Case Study Chapter 10 Light Reflection and Refraction

Here, we have provided case-based/passage-based questions for Class 10 Science  Chapter 10 Light Reflection and Refraction

Case Study/Passage-Based Questions

Question 1:

The spherical mirror forms different types of images when the object is placed at different locations. When the image is formed on the screen, the image is real and when the image does not form on-screen, the image is virtual. When the two reflected rays meet actually, the image is real and when they appear to meet, the image is virtual. A concave mirror always forms a real and inverted image for different positions of the object. But if the object is placed between the focus and pole, the image formed is virtual and erect. A convex mirror always forms a virtual, erect, and diminished image. A concave mirror is used as a doctor’s head mirror to focus light on body parts like eyes, ears, nose, etc., to be examined because it can form erect and magnified images of the object. The convex mirror is used as a rear view mirror in automobiles because it can form a small and erect image of an object.

(i) When an object is placed at the center of curvature of a concave mirror, the image formed is

Answer: (c) same size as that of the object

(ii) No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

Answer: (d): The image is erect in a plane mirror and also in a convex mirror, for all positions of the object.

(iii) A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.

Answer: (c) : As the image of head is bigger, the upper portion of magic mirror is concave. The middle portion of the image is of same size, so, middle portion of magic mirror is plane. Now, the image of legs looks smaller, therefore, the lower portion of magic mirror is convex.

(iv) To get an image larger than the object, one can use (a) convex mirror but not a concave mirror (b) a concave mirror but not a convex mirror (c) either a convex mirror or a concave mirror (d) a plane mirror.

Answer: (b) a concave mirror but not a convex mirror

(v) A convex mirror has wider field of view because (a) the image formed is much smaller than the object and large number of images can be seen (b) the image formed is much closer to the mirror (c) both (a) and (b) (d) none of these.

Answer: (c) both (a) and (b)

Question 2:

The lenses form different types of images when objects are placed at different locations. When a ray is incident parallel to the principal axis, then after refraction, it passes through the focus or appears to come from the focus.

When a ray goes through the optical center of the lens, it passes without any deviation. If the object is placed between the focus and the optical center of the convex lens, an erect and magnified image is formed.

As the object is brought closer to the convex lens from infinity to focus, the image moves away from the convex lens from focus to infinity. Also, the size of the image goes on increasing and the image is always real and inverted.

A concave lens always gives a virtual, erect, and diminished image irrespective of the position of the object.

(i) The location of image formed by a convex lens when the object is placed at infinity is (a) at focus (b) at 2F (c) at optical center (d) between Fand 2F

Answer: (a) at focus

(ii) When the object is placed at the focus of concave lens, the image formed is (a) real and smaller (b) virtual and inverted (c) virtual and smaller (d) real and erect

Answer: (b) virtual and inverted

(iii) The size of image formed by a convex lens when the object is placed at the focus of convex lens is (a) small (b) point in size (c) highly magnified (d) same as that of object

Answer: (c) highly magnified

(iv) When the object is placed at 2F in front of convex lens, the location of image is (a) at F (b) at 2 F on the other side (c) at infinity (d) between F and optical center

Answer: (b) at 2 F on the other side

(v) At which location of object in front of concave lens, the image between focus and optical centre is formed (a) anywhere between centre and infinity (b) at F (c) at 2F (d) infinity

Answer: (a) anywhere between centre and infinity

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Analysis of multi representation ability in solving physics problems for class XI students of SMAN 6 Wajo

• Khatimah, U.
• Amin, B. D.
• Palloan, P.

This research is a descriptive study that aims to understand the description of Multi representations Ability in Solving Physics Problems for Class XI Students of SMAN 6 Wajo. The samples used in this study were students of class XI MIPA SMAN 6 Wajo for the 2021/2022 academic year which amounted to 79 students obtained randomly. The research instrument used was in the form of a multi representation ability test on simple harmonic motion material made in the form of essay questions as many as 10 items. The results obtained indicate that the multi-representation ability of students is in the medium category with a percentage of 81,01%. The percentage of scores and categories for each indicator is obtained for the indicator "change graphic representation to verbal" of 72,15%, on the indicator "change verbal representation to mathematical" the percentage is 53,16%, and for the indicator "changing the representation of the image to mathematical" is at a percentage of 86.08%, each indicator is in a medium category. Based on the results of the study it was concluded that some students have the ability In answering the questions, representing the representation in question is in the medium category.