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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 Class 10 Science Case Based MCQ Questions

CBSE Term 1 exam is not so far and surely you have begun the preparation for the board exam. Therefore we have dedicated this page to help you out in your preparation. This year for the first time the board has introduced the Case based Questions which will be asked in the Term 1 exam that is likely to be held in November-December. 

Therefore, we have brought you the CBSE Class 10 Science Case Based MCQ on this page. The questions are given in objective types. Such types of questions are solved by reading the given scenario in the paragraph. 

All these science case study questions are developed as per the new CBSE Pattern. The team of subject matter experts have crafted the given MCQs. The Case Based Questions that we are providing here are worthy to solve and practice because class 10th syllabus has been taken into consideration while preparing the problems.

CBSE Class 10 Science Case Study, Assertion & Reasoning, MCQ

The Class tenth CBSE Science Case Study, Assertion & Reasoning, MCQs are very helpful in practicing and getting a deep understanding in the topics of science. However, a comprehensible knowledge of NCERT Science Book is a must to be able to solve these types of problems.

The PDF that is available here to download contains the problems in three different variants; One is general objective types of questions that is MCQ (Multiple Choice Questions), second one is Assertion and Reasoning and the last one is Case-Based Questions. 

If you Download PDF CBSE Class 10 Science Case Study from the given links, then you will be able to get the quick revision for each chapter that will help you to recall your learnings and give you information about some important Chemicals Formulas and reactions.

What are Assertion & Reasoning Questions?

Assertion & Reasoning questions are basically a type of multiple-choice question that is solved by reading the given statement and the reason. The question typically consists of one statement followed by its reason. Students' duty is to verify both statements and reason whether they are correct or not and if they are correct then it is time to look at whether the given statement truly satisfies the reason or not.

These questions should not be difficult to solve but you have to have rigorous and extensive practice. The Assertion & Reasoning questions along with the solutions are given in the CBSE Class 10 Science case study 2021-2022 PDF that is available here. 

Class 10th has very basic and important chapters that are necessary to solve. A few chapters that are available in the beginning of the science books are Chemical Reactions and Equations, Acids, Bases and Salts, Metals and Non-metals, Carbon and Its Compounds, Periodic Classification of Elements, Life Processes, etc.

Since you are here to find out the CBSE Class 10 Science MCQ Based Questions, the possibilities are you need CBSE Class 10 Maths Case Study Questions too.

FAQs on CBSE Class 10th Science Case Study Questions

Case Study Questions are based on the data which are given in the form of passage. These types of questions generally consist of real life examples. Usually it contains upto 4 or 5 questions.

To prepare for Class 10 Science MCQ Be thorough with the concepts, Practice the questions regularly, Attempt online tests as much as you can. To do all these things visit the Selfstudys.com. They are providing everything for free of cost.

In class 10 Science Based Questions you will be asked to answer the questions that are explained in the standard Xth Science Syllabus. However, the problems will be related to real world examples.

To find Class 10 Science Chapter wise Assertion and Reason Questions you simply need to reach at the Selfstudys website. It provides all the study resources for free of cost. You will be able to download the assertion reason with solutions as well.

No, CBSE Class 10 Science Case Based MCQ Question is not difficult, if you pay a good attention to the given paragraph. It is important to be able to find the tiny details in the passage to answer the Case Based questions.

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Important Case Study Questions for CBSE Class 10 Science Exam 2024 with Answers

Download case study questions for class 10 science to prepare for the cbse board exam 2024. these multiple choice type questions with answers are published by the cbse board to provide sample questions to students..

CBSE Class 10 Science Case Study Questions 2024: Get here the questions based on case studies to practise for the CBSE Class 10 Science exam 2024. The CBSE Class 10 Science Question Bank on Case Studies, provided in this article, can be very helpful for understanding how the source based or case based questions are asked in the board exam. This question bank is published by the CBSE Board itself which makes it a very reliable source for the board exam preparations. Each question has five sub-questions with each followed by four options and a correct answer. Students can easily download these sample questions in PDF format and refer to the same for their exam preparations.

Note: Check the reduced CBSE Syllabus for Class 10 Science for 2024 Exam and then practise the case study questions accordingly for the CBSE Class 10 Board Exam 2024.  

Important*  Important Last Minute Tips and Resources for CBSE Class 10 Science Exam 2024

SCIENCE- Class X

Sample Case Studies

1. Read the following and answer any four questions from 1.1 to 1.5:

Marble’s popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.

1.1 The substance not likely to contain CaCO 3 is

a) Dolomite

b) A marble statue

c) Calcined gypsum

d) Sea shells.

Answer: c) Calcined gypsum

1.2 A student added 10g of calcium carbonate in a rigid container, secured it tightly and started to heat it. After some time, an increase in pressure was observed, the pressure reading was then noted at intervals of 5 mins and plotted against time, in a graph as shown below. During which time interval did maximum decomposition took place?

a) 15-20 min

b) 10-15 min

c) 5-10 min

Answer: d) 0-5 min

1.3 Gas A, obtained above is a reactant for a very important biochemical process which occurs in the presence of sunlight. Identify the name of the process -

a) Respiration

b) Photosynthesis

c) Transpiration

d) sphotolysis

Answer: b) Photosynthesis

1.4 Marble statues are corroded or stained when they repeatedly come into contact with polluted rain water. Identify the main reason.

a) decomposition of calcium carbonate to calcium oxide

b) polluted water is basic in nature hence it reacts with calcium carbonate

c) polluted water is acidic in nature hence it reacts with calcium carbonate

d) calcium carbonate dissolves in water to give calcium hydroxide.

Answer: c) polluted water is acidic in nature hence it reacts with calcium carbonate

1.5 Calcium oxide can be reduced to calcium, by heating with sodium metal. Which compound would act as an oxidizing agent in the above process?

b) sodium oxide

d) calcium oxide

Answer: d) calcium oxide

2. Read the following and answer any four questions from 2.1 to 2.5:

The reaction between MnO2 with HCl is depicted in the following diagram. It was observed that a gas with bleaching abilities was released.

2.1 The chemical reaction between MnO 2 and HCl is an example of:

a) displacement reaction

b) combination reaction

c) redox reaction

d) decomposition reaction

Answer: c) redox reaction

2.2 Chlorine gas reacts with _______ to form bleaching powder.

a) dry Ca(OH) 2

b) dil. solution of Ca(OH) 2

c) conc. solution of Ca(OH) 2

Answer: a) dry Ca(OH) 2

2.3 Identify the correct statement from the following:

a) MnO 2 is getting reduced whereas HCl is getting oxidized

b) MnO 2 is getting oxidized whereas HCl is getting reduced.

c) MnO 2 and HCl both are getting reduced.

d) MnO 2 and HCl both are getting oxidized.

Answer: a) MnO 2 is getting reduced whereas HCl is getting oxidized

2.4 In the above discussed reaction, what is the nature of MnO 2 ?

a) Acidic oxide

b) Basic oxide

c) Neutral oxide

d) Amphoteric oxide

Answer: b) Basic oxide

2.5 What will happen if we take dry HCl gas instead of aqueous solution of HCl?

a) Reaction will occur faster.

b) Reaction will not occur.

c) Reaction rate will be slow.

d) Reaction rate will remain the same.

Answer: b) Reaction will not occur.

Also, check below other important study material released by the CBSE Board:

CBSE Class Maths Case Study Questions for All Chapters (Published by CBSE)

MCQs for Class 10 English Footprints without Feet (Published by CBSE)

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CBSE Class 10 Science Case Study Questions Download Free PDF

If you are looking for the CBSE Class 10 Science Case Study Questions in PDF, then you are in the right place. CBSE 10th Class Case Study for the Science Subject is available here. These Case studies can help the students to solve the different types of questions that are based on the case study.

CBSE Board will be asking case study questions based on Science subjects in the upcoming board exams. Thus, it becomes an essential resource to study. 

The Science Subject case study for class 10th covers a wide range of chapters from the Science. Students willing to score good marks in their board exams can use it. The questions are highly interactive and it allows students to use their thoughts and skills to solve such kinds of questions.

Case Study Questions Class 10 Science

In board exams, students will find the questions based on assertion and reasoning . Also, there will be a few questions based on case studies. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

• Case Study Questions for Chapter 1 Chemical Reactions and Equations
• Case Study Questions for Chapter 2 Acids, Bases, and Salts
• Case Study Questions for Chapter 3 Metals and Non-Metals
• Case Study Questions for Chapter 4 Carbon and Its Compounds
• Case Study Questions for Chapter 5 Periodic Classification of elements
• Case Study Questions for Chapter 6 Life Processes
• Case Study Questions for Chapter 7 Control and Coordination
• Case Study Questions for Chapter 8 How do organisms reproduce?
• Case Study Questions for Chapter 9 Heredity and Evolution
• Case Study Questions for Chapter 10 Light reflection and refraction
• Case Study Questions for Chapter 11 Human eye and colorful world
• Case Study Questions for Chapter 12 Electricity
• Case Study Questions for Chapter 13 Magnetic effects of current
• Case Study Questions for Chapter 15 Our Environment

The above  Case studies  for CBSE Class 10 Science will help you to score good marks in the Case Study questions that have been coming in your examinations. These CBSE Class 10 Science Case Study have been developed by experts of cbseexperts.com   for benefit of Class 10 students.

Class 10 Science Assertion and Reason Questions

Case Study Type Questions in Science Class 10

Case Study Type Questions in Science Class 10 include the information or data. Students willing to solve them are required to read the passage carefully and then solve them. While solving the paragraph the ideal way is to highlight the key information or given data.

Because later it will ease them to write the final answers. Science Case study type questions consist of 4 to 5 questions that should be answered in an MCQ manner. 

While reading the paragraph students will get the clue in between about the possible answer of the question. They should definitely highlight those questions. This is the best way to solve such kind of Case study Type Questions.

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• CBSE Class 10 Important Questions on Science Chapter 10 - Light Reflection and Refraction 2024-25

CBSE Class 10 Science Chapter-10 Important Questions with Answers - Free PDF Download

The concept of light, reflection, and refraction is quite fascinating for the students of Class 10. In the previous classes, students have learned a lot of new things related to these two natural phenomena occurring with light. In Class 10, they will advance to a new level of concepts related to reflection and refraction. The textbook explains the concepts pretty well. Students will need more Light Reflection and Refraction Class 10 Important Questions with answers to prepare for the exams.

By studying the Class 10 Science Chapter 10 Important Questions, you will develop your concept for this chapter in a better way. In fact, your answering skills will also increase considerably. Check out how the expert teachers at Vedantu have answered the Light Class 10 Important Questions niftily. Download the PDF and follow the format of answering questions as shown by the experts to score more. Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Maths Students who are looking for the better solutions, they can download Class 10 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations.

Download CBSE Class 10 Science Important Questions 2024-25 PDF

Also, check CBSE Class 10 Science Important Questions for other chapters:

Related Chapters

Important Topics under CBSE Class 10 Science Chapter 10 - Light Reflection and Refraction

The following list of important topics covered under the chapter on Light Reflection and Refraction has been provided for students so that they can take a glance at the major concepts and read them through before diving into the important questions.

Reflection of Light

Spherical Mirrors

Image Formation by Spherical Mirrors

Sign Convention for Spherical Mirrors

Mirror Formula and Magnification

Refraction of Light

Refraction through a Rectangular Glass Slab

Refractive Index

Refraction by Spherical Lenses

Image Formation by Lenses and Their Ray Diagrams

Sign Convention for Spherical Lenses

Lens Formula and Magnification

Power of a Lens

Study Important Questions for Class 10 Science Chapter 10 - Light Reflection and Refraction

Long Answer Questions (5 Marks)

1. A convex lens has a focal length of \[10\] cm. At what distance from the lens should the object be placed so that it forms a real and inverted image $20$ cm. away from the lens? What would be the size of the image formed if the object is $2$ cm high? With the help of a ray, the diagram shows the formation of the image by the lens in this case?

Ans: Given, the focal length of the convex lens,

$\Rightarrow f=+10$ cm

Also, given the image formed is real and inverted with the image distance as $20$ cm.

$\Rightarrow v=+20$ cm

From the lens formula, we have: 

$\Rightarrow \dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}$

$\Rightarrow \dfrac{1}{10}=\dfrac{1}{20}-\dfrac{1}{u}$

$\Rightarrow \dfrac{1}{u}=\dfrac{1}{20}-\dfrac{1}{10}$

$\Rightarrow \dfrac{1}{u}=\dfrac{-1}{20}$

$\Rightarrow u=-20$ cm.

$\therefore $ The object is placed at a distance of $20$ cm.

Magnification is given as,

$\Rightarrow m=-\dfrac{v}{u}$

$\Rightarrow m=-\dfrac{20}{\left( -20 \right)}$

$\Rightarrow m=+1$

Also, magnification is given by, $m=\dfrac{Height\text{ of the image}}{Height\text{ of the object}}$.

$\therefore m=\dfrac{Height\text{ of the image}}{2}$

$\Rightarrow 1=\dfrac{Height\text{ of the image}}{2}$

$\Rightarrow Height\text{ of the image}=2$ cm.

Thus, the image is of the same size as that of the object and it is real and inverted.

The ray diagram representing the formation of the image by the lens in this case is:

It is observed that the image is formed at $2{F_2}$ with the object placed at $2{F_1}$.

2. Draw a ray diagram to show the use of a convex lens for the formation of images having the following characteristics. 

a. Real & inverted and diminished 

Ans: A ray diagram representing a real & inverted and diminished image is given below.

b. Virtual, erect & magnified.

Ans: A ray diagram representing a virtual, erect, and magnified image is given below.

3. A convex lens forms a real and inverted image of a needle at a distance of $50$ cm. from it. Where is the needle placed in front of the convex lens if the image is equal to the size of objects? Also, find the power of the lens.

Ans: Given, the image is real and inverted at a distance of $50$ cm.

$\Rightarrow v=+50$ cm

Also given, Height of image $=$ Height of object

We know, magnification is given as,

$\therefore -\dfrac{v}{u}=\dfrac{Height\text{ of the image}}{Height\text{ of the object}}$

Since, Height of image $=$ Height of object and $v=+50$ cm

$\Rightarrow -\dfrac{50}{u}=1$

$\Rightarrow u=-50$ cm

$\Rightarrow \dfrac{1}{f}=\dfrac{1}{50}-\dfrac{1}{-50}$

$\Rightarrow f=25$ cm

$\Rightarrow f=0.25$ m

The power of a lens is given by,

$\Rightarrow P=\dfrac{1}{f}$

$\Rightarrow P=\dfrac{1}{0.25}$  m

$\Rightarrow P=+4$ D

4. One-half of a convex lens is covered with black paper. Will this lens produce a complete image of the object? Verify your answers experimentally. Explain your observations.

Ans: If we cover one-half of a convex lens with black paper it is observed that it produces a complete image of the object.

Representing the given situation with a ray diagram.

Adjust the position of the burning candle such that its image is formed on the screen placed on the other side of the lens.

We get a full image of the burning candle on the screen.

Thus, from the above observation, we conclude that the formation of an image does not depend on the length of the lens, but the brightness of the image formed on the screen depends since the number of rays passing through the lens gets reduced on covering half the lens with black paper.

5. An object $5$ cm in length is held $25$ cm away from a converging lens of focal length $10$ cm. Draw the ray diagram and find the position, size, and nature of the image formed.

Ans: Given focal length of the lens, $f=+10$ cm.

Object distance from the converging lens is given to be $25$ cm and the height of the object ($ho$) is given to be $5$ cm.

$\Rightarrow u=-25$ cm

$\Rightarrow ho=5$ cm

$\Rightarrow \dfrac{1}{10}=\dfrac{1}{v}-\dfrac{1}{-25}$

$\Rightarrow \dfrac{1}{v}=\dfrac{1}{25}-\dfrac{1}{10}$

$\Rightarrow v=\dfrac{50}{3}$ cm

$\Rightarrow v=16.7$ cm

Thus, we conclude that the image formed is real and inverted and is formed at a distance of $16.7$ cm on the other side of the lens.

Also, magnification is given by, $m=\dfrac{Height\text{ of the image}}{Height\text{ of the object}}=\dfrac{hi}{ho}$.

$\therefore -\dfrac{v}{u}=\dfrac{hi}{ho}$

$\Rightarrow \dfrac{16.7}{-25}=\dfrac{hi}{5}$

$\Rightarrow hi=-\dfrac{10}{3}$ cm

Hence, the image is diminished.

The ray diagram representing the above situation is drawn below.

6. A convex lens of focal length $15$ cm formed an image $10$ cm from the lens. How far is the object placed from the lens? Draw the ray diagram.

Ans: Given focal length of the lens, $f=15$ cm.

Image distance from the converging lens is given to be $10$ cm.

$\Rightarrow v=-10$ cm

We observe that the image distance is less than the focal length, hence the image formed would be virtual and erect.

$\Rightarrow \dfrac{1}{15}=\dfrac{1}{-10}-\dfrac{1}{u}$

$\Rightarrow \dfrac{1}{u}=-\dfrac{1}{10}-\dfrac{1}{15}$

$\Rightarrow u=-6$ cm

Light: Reflection and Refraction - Important Questions and Solutions Summary

light rays, mirrors, lenses, prisms, etc., is the advanced version of what you As mentioned earlier, the chapter related to light, reflection, and refraction of have studied in the previous classes. In Class 10, you will have to focus on the theoretical part, as well as, the use of these theories to answer questions.

After you have completed answering the basic questions in the exercise, you might need a question bank to learn more about this chapter. This is where Light Reflection and Refraction Class 10 Important Questions with Answers can be used perfectly. These questions will intellectually challenge your knowledge and foundation of concepts based on this topic. You can answer on your own and check whether you know the right answer or not.

Class 10 Light Reflection and Refraction Important Questions have been developed by the expert teachers to provide a strong idea of how questions are set in the exams. All these questions are developed to define how theoretical concepts are used to solve conceptual problems. You will gain a better insight into the chapters and strengthen your foundation accordingly.

Benefits of Studying the CBSE Class 10 Important Questions on Science Chapter 10 - Light Reflection and Refraction

The Important Questions for Class 10 Light Reflection and Refraction have been developed based on the basic and advanced concepts you have learned in your science textbook. Let us check the benefits of studying these questions first.

Thinking Out of the Box

The Important Questions of Light Reflection and Refraction Class 10 is the ultimate suggestion for the upcoming board exam. You can study these questions, prepare their answers on your own, and compare them with the solution provided. This will help you to understand how efficiently you have studied the chapter. Light Class 10 Important Questions have been developed to help you think out of the box. In most cases, the thoughts of the students remain stuck in the exercises of the textbook. These questions will help them think out of the box and challenge their intellect.

Getting to Know Possible Important Questions of Chapter 10 Class 10 Science

By studying Class 10th Science Chapter 10 Important Questions , you will get to know possible questions that might come in the board exams. All these questions are developed by experienced science teachers. They are well-aware of the type of questions asked in the CBSE exam . Hence, studying these questions will help you learn about different modes and patterns.

Making Concepts Easier to Understand

The Important Questions for Class 10 Science Light Reflection and Refraction have simple explanations. All the concepts in this chapter will be exceptionally simplified and utilized to answer these important questions. Hence, the students will get another way to learn how to use the textbook concepts to solve challenging questions in the exams.

Efficient Answering Methods

The Ch 10 Science Class 10 Important Questions will also come with a proper solution. The solutions will have the perfect answers to all these important questions. You will get another set of questions and answers to follow and find out the best approaches to score well in the exams. These approaches are simplified and designed by following the CBSE guidelines .

Mastering Solving Numerical Questions

This chapter poses a challenge in the form of numerical questions related to mirrors and lenses. These problems are based on a set of formulas related to the focal distance, object distance, and image distance of lenses and mirrors. By using Class 10 Science Chapter 10 Important Questions and Solutions, you can master using the formula in different aspects without committing mistakes.

You can download Chapter 10 Science Class 10 Important Questions and solutions in PDF format and study them offline. Get this extra set of questions and use them as a reference to clear your concepts of this crucial chapter.

Important Related Links for CBSE Class 10 Science

FAQs on CBSE Class 10 Important Questions on Science Chapter 10 - Light Reflection and Refraction 2024-25

1. Why Should You Prefer Vedantu for Important Questions of Light Class 10?

The teachers of Vedantu have formulated the best possible questions of Class 10 Light for the students to follow. The answers are simple and follow the CBSE guidelines. You can rest be assured that you will get the best-quality questions and answers to study.

2. Why Should You Study Light Reflection and Refraction Important Questions?

By studying the Light Reflection and Refraction Class 10 Important Questions, you will get a good idea of what questions are asked in the board exam. Follow the answering style and score more in the main exam.

3. What are the important topics covered in the CBSE Class 10 Science Chapter 10 - Light Reflection and Refraction?

The following are the important topics covered in the Chapter on Light Reflection and Refraction: 

CBSE Class 10 Science Important Questions

Cbse study materials.

• NCERT Solutions
• NCERT Solutions for Class 10
• NCERT Class 10 Science
• Chapter 10 Light Reflection And Refraction

NCERT Solutions for Class 10 Science Chapter 10: Light Reflection and Refraction

Ncert solutions class 10 science chapter 10 – cbse free pdf download.

* According to the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 9.

NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction is structured in a way to present a comprehensible coverage of scientific topics related to our daily life. Basic science has been laid out to students with no sharp divisions in disciplines such as Physics, Chemistry and Biology. NCERT is accepted and recommended throughout schools in the nation. Following are a few reasons to rely on NCERT Solutions :

• The tricky questions inserted between chapters force students to think out of the box and apply the concepts learned in the chapter.
• NCERT Solutions provide you with detailed solutions to the chapter questions that help you fetch marks in the CBSE exams.

Download Exclusively Curated Chapter Notes for Class 10 Science Chapter – 10 Light Reflection and Refraction

Download most important questions for class 10 science chapter – 10 light reflection and refraction.

NCERT Solutions are popular among students, especially for Science and Mathematics. NCERT Solutions for Class 10 Science Chapter 10 – Light Reflection and Refraction provided here consists of well-explained solutions to all the questions asked in the textbook. Get your hands on the comprehensive NCERT Solutions for Chapter 10 Light Reflection and Refraction, here, for free!

• Chapter 1 Chemical Reactions and Equations
• Chapter 2 Acids, Bases and Salts
• Chapter 3 Metals and Non-metals
• Chapter 4 Carbon and Its Compounds
• Chapter 5 Periodic Classification of Elements
• Chapter 6 Life Processes
• Chapter 7 Control and Coordination
• Chapter 8 How do Organisms Reproduce?
• Chapter 9 Heredity and Evolution
• Chapter 11 The Human Eye and Colourful World
• Chapter 12 Electricity
• Chapter 13 Magnetic Effects of Electric Current
• Chapter 14 Sources of Energy
• Chapter 15 Our Environment
• Chapter 16 Management of Natural Resources

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Access Chapter-wise NCERT Solutions for Class 10 Science – Light Reflection and Refraction

Questions Page: 168

1. Define the principal focus of a concave mirror.

Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is called the principal focus of the concave mirror.

2. The radius of curvature of a spherical mirror is 20 cm. What is its focal length?

Radius of curvature (R) = 20 cm

Radius of curvature of the spherical mirror = 2 × Focal length (f)

f= R/2 = 20 / 2 = 10

Therefore, the focal length of the spherical mirror is 10 cm.

3. Name the mirror that can give an erect and enlarged image of an object.

The mirror that can give an erect and enlarged image of an object is a Concave Mirror.

4. Why do we prefer a convex mirror as a rear-view mirror in vehicles?

A convex mirror is preferred as a rear-view mirror in cars and vehicles as it gives a wider field of view, which helps the driver see most of the traffic behind him. Convex mirrors always form an erect, virtual, and diminished image of the objects placed in front of it.

Page No: 171

1. Find the focal length of a convex mirror whose radius of curvature is 32 cm.

Radius of curvature (R) = 32 cm

Radius of curvature = 2 × Focal length (f)

f = R/2 = 32/2 = 16

Therefore, the focal length of the given convex mirror is 16 cm.

2. A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?

Magnification produced by a spherical mirror:

Object distance (u) = – 10 cm

v = 3 × (- 10) = – 30 cm

Therefore, the negative sign indicates that an inverted image is formed in front of the given concave mirror at a distance of 30 cm.

Page No: 176

1. A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?

The light ray bends towards the normal. When a light ray enters from an optically rarer medium (which has a low refractive index) to an optically denser medium (which has a high refractive index), its speed slows down and bends towards the normal. As water is optically denser than air, a ray of light entering from air into water will bend towards the normal.

2. Light enters from air to glass, having a refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 x 10 8 ms -1 .

Refractive index of a medium (nm) = Speed of light in vacuum/Speed of light in the medium

Speed of light in vacuum (c) = 3 × 10 8 m/s

Refractive index of glass (ng) = 1.50

Speed of light in the glass (v) = Speed of light in vacuum/ Refractive index of glass

=3 × 10 8 /1.50 = 2x 10 8 ms -1 .

3. Find out, from the table, the medium having the highest optical density. Also, find the medium with the lowest optical density.

Lowest optical density = Air

Highest optical density = Diamond

The optical density of a medium is directly related to its refractive index. A medium with the highest refractive index will have the highest optical density and vice-versa.

It can be observed from the table that air and diamond, respectively have the lowest and highest refractive index. Hence, air has the lowest optical density and diamond has the highest optical density.

4. You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in the table.

Light travels faster in water as compared to kerosene & turpentine, as the refractive index of water is lower than that of kerosene and turpentine. The speed of light is inversely proportional to the refractive index.

5. The refractive index of diamond is 2.42. What is the meaning of this statement?

A diamond has a refractive index of 2.42, which means that the speed of light in a diamond will reduce by a factor of 2.42 as compared to its speed in the air.

In other words, the speed of light in a diamond is 1/2.42 times the speed of light in a vacuum.

Page No: 184

1. Define 1 dioptre of power of a lens.

Dioptre is the SI unit of power of lens is denoted by the letter D. 1 dioptre can be defined as the power of a lens of focal length 1 metre.

2. A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.

The position of the image should be at 2F since the image is real and the same size.

It is given that the image of the needle is formed at a distance of 50 cm from the convex lens. Therefore, the needle is placed in front of the lens at a distance of 50 cm.

Object distance (u) = – 50 cm

Image distance, (v) = 50 cm

Focal length = f

According to the lens formula,

3. Find the power of a concave lens of focal length 2 m.

The focal length of the concave lens (f) = 2 m

Power of lens (P) = 1/f = 1/ (-2) = -0.5D

Page No: 185

1. Which one of the following materials cannot be used to make a lens?

(c) Plastic

(d) Clay cannot be used to make a lens because if the lens is made up of clay, the light rays cannot pass through it

2. The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?

(a) Between the principal focus and the centre of curvature

(b) At the centre of curvature

(c) Beyond the centre of curvature

(d) Between the pole of the mirror and its principal focus.

(d) The position of the object should be between the pole of the mirror and its principal focus.

3. Where should an object be placed in front of a convex lens to get a real image of the size of the object?

(a) At the principal focus of the lens

(b) At twice the focal length

(c) At infinity

(d) Between the optical centre of the lens and its principal focus.

(b) The object should be placed at twice the focal length

4. A spherical mirror and a thin spherical lens have a focal length of -15 cm. The mirror and the lens are likely to be

(a) both concave

(b) both convex

(c) the mirror is concave, and the lens is convex

(d) the mirror is convex, but the lens is concave

(a) Both are likely to be concave.

Page No: 186

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

(b) concave

(d) either plane or convex

(d) The mirrors are likely to be either plane or convex

6. Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

(a) A convex lens of focal length 50 cm

(b) A concave lens of focal length 50 cm

(c) A convex lens of focal length 5 cm

(d) A concave lens of focal length 5 cm

(c) A convex lens of focal length 5 cm can be used while reading small letters found in a dictionary

7. We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.

Range of the distance of the object = 0 to 15 cm from the pole of the mirror.

Nature of the image = virtual, erect, and larger than the object.

8. Name the type of mirror used in the following situations.

(a) Headlights of a car

(b) Side/rear-view mirror of a vehicle

(c) Solar furnace

Support your answer with a reason.

(a) Concave Mirror: Concave mirrors can produce a powerful parallel beam of light when the light source is placed at their principal focus.

(b) Convex Mirror: Because of its largest field of view.

(c) Concave Mirror: Because it concentrates the parallel rays of the sun at a principal focus.

9. One-half of a convex lens is covered with black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations.

Yes, it will produce a complete image of the object, as shown in the figure. This can be verified experimentally by observing the image of a distant object, like a tree on a screen, when the lower half of the lens is covered with black paper. However, the intensity or brightness of the image will reduce.

10. An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and nature of the image formed.

Height of the object, h 0 = 5 cm

Distance of the object from converging lens, u = -25 cm

Focal length of a converging lens, f = 10 cm

Using the lens formula,

Thus, the image is inverted and formed at a distance of 16.7 cm behind the lens and measures 3.3 cm. The ray diagram is shown below.

11. 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.

Focal length of concave lens (OF 1 ), f = – 15 cm

Image distance, v= – 10 cm

The negative value of u indicates that the object is placed 30 cm in front of the lens. This is shown in the following ray diagram.

12. An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.

Focal length of convex mirror (f) = +15 cm

According to the mirror formula,

The image is located at a distance of 6 cm from the mirror on the other side of the mirror.

The positive and a value of less than 1 magnification indicates that the image formed is virtual, erect, and diminished.

13. The magnification produced by a plane mirror is +1. What does this mean?

The positive sign means an image formed by a plane mirror is virtual and erect. Since the magnification is 1, it means that the size of the image is equal to the size of the object.

14. An object 5 cm is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position, nature and size of the image.

Object distance (u) = – 20 cm

Object height (h) = 5 cm

Radius of curvature (R) = 30 cm

Radius of curvature = 2 × Focal length

The positive value of image height indicates that the image formed is erect.

Hence, the image formed is erect, virtual, and smaller in size.

15. An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed so that a sharply focused image can be obtained? Find the size and nature of the image.

Object distance (u) = – 27 cm

Object height (h) = 7 cm

Focal length (f) = – 18 cm

The negative value of image height indicates that the image formed is inverted.

16. Find the focal length of a lens of power -2.0 D. What type of lens is this?

Power of lens (P) = 1/f

f = -1/2 = -0.5 m

A concave lens has a negative focal length. Therefore, it is a concave lens.

17. 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?

f = 1/1.5 = 10/15 = 0.66 m

A convex lens has a positive focal length. Therefore, it is a convex lens or a converging lens.

NCERT Solutions For Class 10 Science Chapter 10 – Light Reflection and Refraction

Chapter 10 Light Reflection and Refraction are one of the important chapters in Class 10 Science, and the expected marks weightage of the chapter, according to the latest marking scheme is 7 marks. In Chapter 10 of Class 10 Science, students will get well-versed in light phenomena such as refraction and reflection. One will learn about spherical mirrors, image formation and to draw ray diagrams.

Topics covered in this chapter:

• Reflection of Light
• Spherical Mirrors
• Image Formation by Spherical Mirrors
• Representation of Images Formed by Spherical Mirrors Using Ray Diagram – 4 Questions (2 short, 2 long)
• Mirror Formula and Magnification – 2 Questions (2 Numerical)
• Refraction of Light – 5 Questions (1 numerical, 2 Long answers and 1 Short answer)
• Power of Lens – 3 Questions (2 Short answers and 1 numerical)

Have you ever wondered what makes things visible to us? The answer to the question is light. During the day, it is sunlight that helps us see objects. When light falls on an object, it reflects. This reflected ray, when received by our eyes, helps us see things. Numerous wonderful phenomena are associated with light, such as the formation of the rainbow, of stars, and many more. In Chapter 10 Light Reflection and Refraction of Class 10 Science, let us study the phenomena of refraction and reflection using straight-line propagation of light. We shall also try to understand the reflection of light by spherical mirrors in this chapter using the NCERT Solutions from BYJU’S.

Key Features of NCERT Solutions for Class 10 Science Chapter 10 – Light Reflection and Refraction:

• Provides comprehensive answers to all the questions asked in the chapter
• The language used is lucid and can be understood by all
• The information provided is genuine and appropriate
• These solutions can be referred for CBSE exams, Olympiads and other competitive exams
• Concise answers are provided to help students understand better

Frequently Asked Questions on NCERT Solutions for Class 10 Science Chapter 10

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NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

Chapter 10 Light Reflection and Refraction Class 10 NCERT Solutions

Ncert solutions for class 10 science chapters:, why do we prefer a convex mirror as a rear-view mirror in vehicles, what is meant by power of a lens, what is absolute refractive index, when a convex lens will act as magnifying glass, which mirror give an erect and enlarged image of an object, contact form.

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Case Study Questions Class 10 Science Our Environment

Case study questions class 10 science chapter 15 our environment.

CBSE Class 10 Case Study Questions Science Our Environment. 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 Our Environment.

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, 15 marks.

CBSE Case Study Questions Class 10 Science Our Environment

Case Study – 1 

1.) Waste management is essential in today’s society. Due to an increase in population, the generation of waste is getting doubled day by day. Moreover, the increase in waste is affecting the lives of many people. Waste management is the managing of waste by disposal and recycling of it. Moreover, waste management needs proper techniques keeping in mind the environmental situations. For instance, there are various methods and techniques by which the waste is disposed of. You must have come across 5 R’s to save the environment: refuse, reduce, reuse, repurpose and recycle.

[ CBSE Academic Question Paper ] 

1) Recycling of paper is a good practice but recycled paper should not be used as food packaging because

a) recycled papers take lots of space b) recycled papers can’t cover food properly c) recycled papers can cause infection d) recycled papers are costly

Answer – c) recycled papers can cause infection

2) Effective segregation of wastes at the point of generation is very important. Select the appropriate statements giving the importance of waste segregation.

• i) less waste goes to the landfills
• ii) better for public health and the environment
• iii) help in reducing the waste
• iv) resulting in deterioration of a waste picker’s health

a) both i) and ii) b) both i) and iii) c) both ii) and iii) d) both i) and iv)

Answer – a) both i) and ii)

Case Study – 2

1.) Food chains are very important for the survival of most species. When only one element is removed from the food chain it can result in extinction of a species in some cases. The foundation of the food chain consists of primary producers. Primary producers, or autotrophs, can use either solar energy or chemical energy to create complex organic compounds, whereas species at higher trophic levels cannot and so must consume producers or other life that itself consumes producers. Because the sun’s light is necessary for photosynthesis, most life could not exist if the sun disappeared. Even so, it has recently been discovered that there are some forms of life, chemotrophs, that appear to gain all their metabolic energy from chemosynthesis driven by hydrothermal vents, thus showing that some life may not require solar energy to thrive.

1) If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy?

• a) 10,000 J
• d) It will depend on the type of the terrestrial plant.

Answer – b) 100 J

2) Matter and energy are two fundamental inputs of an ecosystem. Movement of

• a) Energy is bidirectional and matter is repeatedly circulating.
• b) Energy is repeatedly circulation and matter is unidirectional.
• c) Energy is unidirectional and matter is repeatedly circulating.
• d) Energy is multidirectional and matter is bidirectional.

Answer – c) Energy is unidirectional and matter is repeatedly circulating

3) Mr. X is eating curd/yogurt. For this food intake in a food chain he should be considered as occupying

• a) First trophic level
• b) Second trophic level
• c) Third trophic level
• d) Fourth trophic level

Answer – c) Third Trophic level

4 Which of the following limits the number of trophic levels in a food chain?

• a) Decrease in energy at higher trophic levels
• b) Less availability of food
• c) Polluted air

Answer  – a) Decrease in energy at higher trophic level

5) The decomposers are not included in the food chain. The correct reason for the same is because decomposers:

• a) Act at every trophic level of the food chain
• b) Do not breakdown organic compounds
• c) Convert organic material to inorganic forms
• d) Release enzymes outside their body to convert organic material to inorganic forms

Answer – a) Act at every trophic level of the food chain

Case Study – 3

Food chains are very important for the survival of most species.

1) Which of the following limits the number of trophic levels in a food chain?

Answer – a) Decrease in energy at higher trophic level 

2) If Ravi is consuming curd/yogurt for lunch , which trophic level in a food chain he should be considered as occupying ?

Answer – c) Third Trophic level 

3) Matter and energy are two fundamental inputs of an ecosystem. Movement of

Answer – c) Energy is unidirectional and matter is repeatedly circulating.

4) If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy ?

Answer – a) Act at every trophic level of the food chain

Case study – 4

In Kunjpura village, located in Karnal district, Haryana, Aditya Aggarwal and his older brother Amit Aggarwal run Tee Cee Industries, a steel plant set up by their ancestors in 1984. Along with this, they also run a gaushala that houses 1,200 cows that can no longer produce milk. The cow shelter was manageable but running the steel plant was turning out to be expensive because they spent a whopping Rs 5 lakh every month on electricity. The brothers struck upon an idea. Why not run the factory with the biogas produced from cow dung from the shelter and other gaushalas, along with bio and agri led Aditya and Amit to start Amrit Fertilizers, a biogas project, in 2014, without any government support.

1) Raw material used in bio gas plant is

• (a) Animal dung
• (b) crop residue
• (c) Food waste
• (d) All of the above

Answer – (d) All of the above

2) Biogas is a better fuel than animal dung cake because

• (i) Biogas has lower calorific value.
• (ii) Animal dung cake has higher calorific value.
• (iii) Biogas has high heating capacity.
• (iv) Biogas burns without smoke.

(a) (i) only

(b) (ii) only

(c) (iii) and (iv)

(d) (i) and (ii)

Answer – (c) (iii) and (iv)

3) Biogas is formed in the

(a) presence of air only.

(b) presence of water only.

(c) absence of air only.

(d) presence of water and absence of air.

Answer – (d) presence of water and absence of air.

4) Biogas is a mixture of the following gases.

(a) Ethane,Carbon monoxide, Nitrogen and Butane

(b) Methane,Hydrogen,Carbon dioxide and Nitrogen

(c) Butane,Carbon monoxide,Propane and Hydrogen

(d) Carbon monoxide,Sulphur dioxide and Hydrogen

Answer – (b) Methane, Hydrogen, Carbon dioxide and Nitrogen

CASE STUDY : 5

We are an integral part of the environment. Changes in the environment affect us and our activities change the environment around us

Ozone (O3 ) is a molecule formed by three atoms of oxygen. While O2 , which we normally refer to as oxygen, is essential for all aerobic forms of life. Ozone, is a deadly poison. However, at the higher levels of the atmosphere, ozone performs an essential function. It shields the surface of the earth from ultraviolet (UV) radiation from the Sun.

i) How does ozone is formed?

Ans: The UV radiations coming from the sun split the molecular oxygen into nascent oxygen. When these nascent oxygen combined to molecular oxygen, it forms ozone(O3).

ii) In which layer of atmosphere does ozone is present?

Ans: The ozone is present in the stratosphere layer of atmosphere just above troposphere.

iii) What are the causes for ozone depletion?

Ans: The synthetic chemicals like CFCs ( chlorofluorocarbons) which used as refrigerants amd in the fire extinguisher

iv) Write the chemical reaction for the formation of ozone?

Ans:  O2  👉  [O]   +    [O]

[O]  +  O2   👉   O3 (ozone)

v) What are the effects of UV radiations?

Ans: It causes different types of cancer in human beings.

CASE STUDY : 6

In our daily activities, we generate a lot of material that are thrown away. What are some of these waste materials? What happens after we throw them away? Let us perform an activity to find answers to these questions.

• Collect waste material from your homes. This could include all the waste generated during a day, like kitchen waste (spoilt food, vegetable peels, used tea leaves, milk packets and empty cartons), waste paper, empty medicine bottles/strips/bubble packs, old and torn clothes and broken footwear.
• Bury this material in a pit in the school garden or if there is no space available, you can collect the material in an old bucket/ flower pot and cover with at least 15 cm of soil.
• Keep this material moist and observe at 15-day intervals.
• What are the materials that remain unchanged over long periods of time?
• What are the materials which change their form and structure over time?
• Of these materials that are changed, which ones change the fastest?

We have seen in the chapter on ‘Life Processes’ that the food we eat is digested by various enzymes in our body. Have you ever wondered why the same enzyme does not break-down everything we eat? Enzymes are specific in their action, specific enzymes are needed for the break-down of a particular substance. That is why we will not get any energy if we try to eat coal! Because of this, many human-made materials like plastics will not be broken down by the action of bacteria or other saprophytes. These materials will be acted upon by physical processes like heat and pressure, but under the ambient conditions found in our environment, these persist for a long time.

i) What is biodegradable substances?

Ans: The substances that are broken down by biological process are called as biodegradable substances.

Eg: Vegetables waste materials.

ii) What are the examples of non- biodegradable substances?

Ans: Plastic, rubber, foam, batteries etc.

iii) what are the ways through which we can reduce pollution especially the non- biodegradable waste?

Ans: •We can use RRR methods i.e reduce, reuse and recycle.

Reduce the use of plastic

iv) What are the effects of biodegradable substances on our environment?

Ans: • Release green house gases.

They are breeding ground for mosquitoes and houseflies causing various disease.

v) What are the non- biodegradable on environment?

Ans: • causes soil pollution and sometimes air pollution when burnt in air.

• death of cattles due to ingestion of these waste.
• choking of drainage system

CASE STUDY : 7

The food we eat acts as a fuel to provide us energy to do work. Thus the interactions among various components of the environment involves flow of energy from one component of the system to another. As we have studied, the autotrophs capture the energy present in sunlight and convert it into chemical energy. This energy supports all the activities of the living world. From autotrophs, the energy goes to the heterotrophs and decomposers.

i) What is food chain?

Ans: A series of organism feeding on one another and taking part in various biotic levels is called food chain.

ii) Give a example of one terrestrial food chain.

Ans: Sunlight 👉 plants (producers) 👉 Goat/ Deer (herbivores)  👉 Tiger (carnivores)

iii) What are the feature of food chain?

Ans: •It is unidirectional

The energy available at each level gets diminished due to loss at each level.

iv) What do you meant by biological magnification?

Ans: The gradual increase in the concentration of any substance ( generally toxic) in trophic levels is called as biological magnification.

v) What is the average value for the amount of organic matter that is present at each step and reaching the next level of consumers?

CASE STUDY : 8

All organisms such as plants, animals, microorganisms and human beings as well as the physical surroundings interact with each other and maintain a balance in nature. All the interacting organisms in an area together with the non-living constituents of the environment form an ecosystem. Thus, an ecosystem consists of biotic components comprising living organisms and abiotic components comprising physical factors like temperature, rainfall, wind, soil and minerals.

i) What is natural ecosystem?

Ans: An environment where living organism and non- living interact with each other freely in nature is called as natural ecosystem.

ii) what are the examples of artificial ecosystem?

Ans: Gardens, crop- fields

iii) what are consumers?

Ans: Organism which consume food either directly or indirectly by feeding on one another animals are called as consumers.

iv) What are the type of consumers?

Ans: They are herbivores, carnivores, omnivores and parasites.

v) What are producers?

Ans: The green plants and some bacteria which make their food by using sunlight i.e photosynthesis are called as producers

We hope that above case study questions will help you for your upcoming exams. To see more click below – 

• Class 10 Assertion & Reason
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• Important Difference between Class 10 Physics

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Case Study Questions Class 10 Science Chapter 1 Chemical Reactions and Equations

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CBSE Board Exam is on the way, so you must practice some good Case Studies and Passage Based Questions of Class 10 Science to boost your preparation to score 95+% on Boards. In this post, you will get Case Study and Passage Based Questions that will come in CBSE Class 10 Science Board Exams. These Case Study Questions Class 10 Science are written by experts.

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.

Chemical Reactions and Equations Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 10 Science  Chapter 1 Chemical Reactions and Equations

Case Study/Passage-Based Questions

Question 1:

A chemical reaction is a representation of chemical change in terms of symbols and formulae of reactants and products. There are various types of chemical reactions like combination, decomposition, displacement, double displacement, oxidation, and reduction reactions. Reactions in which heat is released along with the formation of products are called exothermic chemical reactions. All combustion reactions are exothermic reactions.

(i) The chemical reaction in which a single substance breaks down into two or simpler substances upon heating is known as (a) thermal decomposition reaction (b) photodecomposition reaction (c) electric decomposition reaction (d) both (a) and (c)

Answer: (a) The chemical reaction in which a single substance breaks down into two or more simpler substances upon heating is known as thermal decomposition reaction.

(ii) The massive force that pushes the rocket forward through space is generated due to the (a) combination reaction (b) decomposition reaction (c) displacement reaction (d) double displacement reaction

Answer: (b) The massive force that pushes the rocket forward through space is generated due to the decomposition reaction. Hydrogen peroxide decomposes and provides it with a considerable reaction force thrust.

(iii) A white salt on heating decomposes to give brown fumes and the yellow residue is left behind. The yellow residue left is of (a) lead nitrate (b) nitrogen oxide (c) lead oxide (d) oxygen gas

Answer: (c) Lead nitrate decomposes to give brown fumes of nitrogen dioxide gas and yellow residue of lead oxide is left behind.

(iv) Which of the following reactions represents a combination reaction? (a) CaO (s) + H 2 O (l) → Ca(OH) 2  (aq) (b) CaCO 3  (s) → CaO (s) + CO 2 (g) (c) Zn(s) + CuSO 4  (aq) → ZnSO 4  (aq) + Cu(s) (d) 2FeSO 4 (s) → Fe 2 O 3  (s) +SO 2 (g) + SO 3 (g)

Answer: (a) A reaction in which two or more reactants combine to form a single product is known as a combination reaction.

(v) Complete the following statements by choosing correct type of reaction for X and Y. Statement 1:  The heating of lead nitrate is an example of ‘X’ reaction. Statement 2:  The burning of magnesium is an example of ‘Y’ reaction. (a) X- Combination, Y- Decomposition (b) X- Decomposition, Y-Combination (c) X- Combination, Y-Displacement (d) X- Displacement, Y-Decomposition

Answer: (b) Heating of lead nitrate to form nitrogen dioxide and lead oxide is an example of thermal decomposition reaction and the burning of magnesium ribbon in the air to form magnesium oxide is an example of combination reaction.

Question 2:

In a chemical reaction, reactants are converted into products. The conversion of reactants into products in a chemical reaction is often accompanied by some features which can be observed easily. These easily observed features which take place as a result of chemical reactions are known as characteristics of chemical reactions. Some important characteristics of chemical reactions are:  (I) Evolution of heat  (II) Formation of a precipitate (III) Change in color (IV) Change in temperature (V) Change in state

Anyone of these general characteristics can tell us whether a chemical reaction has taken place or not.

(i) Reaction of magnesium with air is a/an

Answer: (a) exothermic reaction

(ii) In the following reaction Ca 2+ (aq)+2OH−(aq)⟶Ca(OH) 2 (s)Ca(aq) 2 ++2OH(aq)−⟶Ca(OH) 2 (s) precipitate of calcium hydroxide will be of

Answer: (d) white colour

(iii) In the given reaction, S(s)+O 2 (g)⟶SO 2 S(s)+O 2 (g)⟶SO 2 the physical state of SO 2  is

Answer: (c) gaseous 

(iv) Which one of the following processes involves chemical reactions?

Answer: (d) Heating copper wire in the presence of air at high temperature.

(v) In which of the following reactions, high amount of heat energy will be evolved?

Answer: (c) Burning of L.P.G.

Case Study 3: Chemical reactions and equations are fundamental concepts in chemistry that help us understand the transformation of substances. A chemical reaction involves the rearrangement of atoms to form new substances with different properties. In a chemical equation, the reactants are written on the left side, and the products are written on the right side, separated by an arrow. The number of atoms of each element must be balanced on both sides of the equation. This is achieved by using coefficients to adjust the number of molecules involved in the reaction. Chemical reactions can be classified into various types, such as combination reactions, decomposition reactions, displacement reactions, and redox reactions. Understanding and balancing chemical equations is crucial for studying chemical reactions, predicting the products formed, and analyzing the stoichiometry of reactions.

What do chemical reactions involve? a) Formation of new substances with different properties b) Rearrangement of atoms c) Balancing of equations d) All of the above Answer: d) All of the above

How are reactants and products represented in a chemical equation? a) Reactants on the left side, products on the right side b) Reactants on the right side, products on the left side c) Reactants and products mixed together d) Reactants and products in different equations Answer: a) Reactants on the left side, products on the right side

What must be balanced in a chemical equation? a) Number of molecules b) Number of atoms of each element c) Physical properties of substances d) Coefficients Answer: b) Number of atoms of each element

Which type of chemical reaction involves the breakdown of a compound into simpler substances? a) Combination reaction b) Decomposition reaction c) Displacement reaction d) Redox reaction Answer: b) Decomposition reaction

Why is balancing chemical equations important? a) To predict the products formed in a reaction b) To analyze the stoichiometry of reactions c) To study chemical reactions d) All of the above Answer: d) All of the above

Hope the information shed above regarding Case Study and Passage Based Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations with Answers Pdf free download has been useful to an extent. If you have any other queries about CBSE Class 10 Science Chemical Reactions and Equations 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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CBSE 10th Standard Science Subject Heredity and Evolution 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 

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Cbse 10th standard science subject heredity and evolution case study questions with solution 2021.

10th Standard CBSE

Final Semester - June 2015

Sex determination is the method by which distinction between males and females is established in a species. The sex of an individual is determined by specific chromosomes. These chromosomes are called sex chromosomes or allosomes. X and Y chromosomes are called sex chromosomes. The normal chromosomes other than the sex chromosomes of an individual are known as autosomes. (i) In XX-XO type of sex determination (a) females produce two different types of gametes (b) males produce two different types of gametes (c) females produce gametes with Y chromosome (d) males produce gametes with Y chromosome. (ii) A couple has six daughters. What is the possibility of their having a girl next time?

(iii) Number of autosomes present in liver cells of a human female is

(iv) XX-XO type of sex determination and XX-XY type of sex determination are the examples of

(v) Select the incorrect statement. (a) In male grasshoppers, 50% of sperms have no sex chromosome (b) Female fruitfly is heterogametic (c) Human male produces two types of sperms 50% having X chromosome and 50% having Y chromosomes (d) In turtle, sex determination is regulated by environmental factors.

Gregor Mendel conducted hybridisation experiments on garden peas for seven years and proposed the laws of inheritance in living organisms. He investigated characters in the garden pea plant that were manifested as two opposing traits, e.g., tall or dwarf plants, yellow and green seeds, etc. (i) Among the seven pairs of contrasting traits in pea plant as studied by Mendel, the number of traits related to flower, pod and seed respectively were

(ii) The colour based contrasting traits in seven contrasting pairs, studied by Mendel in pea plant were

(iii) Refer to the given table of contrasting traits in pea plants studied by Mendel.

Which of the given traits is correctly placed? (a) (i), (ii) and (iii) only (b) (ii), (iii) and (iv) only (c) (ii) and (iii) only (d) (i), (ii), (iii) and (iv) (iv) Some of the dominant traits studied by Mendel were (a) round seed shape, green seed colour and axial flower position (b) terminal flower position, green pod colour and inflated pod shape (c) violet flower colour, green pod colour and round seed shape (d) wrinkled seed shape, yellow pod colour and axial flower position. (v) Which of the following characters was not chosen by Mendel?

Mendel crossed tall and dwarf pea plants to study the inheritance of one gene. He collected the seeds produced as a result of this cross and grew them to generate plants of the first hybrid generation which is called the first filial progeny or F 1 : Mendel then self pollinated the tall F 1 plants and he obtained F 2 generation. (i) In garden pea, round shape of seeds is dominant over wrinkled shape. A pea plant heterozygous for round shape of seed is selfed and 1600 seeds produced during the cross are subsequently germinated. How many seedlings would have non-parental phenotype?

(ii) If 'A' represents the dominant gene and 'a' represents its recessive allele, which of the following would be the most likely result in the first generation offspring when Aa is crossed with aa ? (a) All will exhibit dominant phenotype. (b) All will exhibit recessive phenotype. (c) Dominant and recessive phenotypes will be 50% each. (d) Dominant phenotype will be 75%. (iii) Which of the following crosses will give tall and dwarf pea plants in same proportions?

(iv) What result Mendel would have got, if he self pollinated a homozygous tall F 2 plant? (a) TT and Tt (b) All Tt (c) All TT (d) All tt (v) In plant, tall phenotype is dominant over dwarf phenotype, and the alleles are designated as T and t, respectively. Upon crossing one tall and one dwarf plant, total 250 plants were obtained, out of which 124 displayed tall phenotype and rest were dwarf. Thus, the genotype of the parent plants were (a) TT x TT (b) TT x tt (c) Tt x Tt d) Tt x tt.

The cross that include the inheritance of two pairs of contrasting characters simultaneously is referred as dihybrid cross. Mendel chose pure breeding plants for yellow and green seeds and round and wrinkled shape of seeds. He cross pollinated the plant having yellow round seeds with plant having green wrinkled seeds. All the plants produced in F 1 generation were having, yellow round seeds. The plants raised from these seeds were self pollinated, that resulted in production of plants having four phenotypically different types of seeds. (i) When a cross is made between a yellow round seeded plant (YyRr) and a yellow wrinkled seeded plant (Yyrr), what is true regarding the proportions of phenotypes of the offsprings in F 1  generation?

(ii) How many types of gametes can be produced by YYrr?

(iii) In Mendelian dihybrid cross, when heterozygous tall plant with green seeds are self crossed the progenies are

(iv) When round yellow seeded heterozygous pea plants are self fertilised, the frequency of occurrence of RrYY genotype among the offsprings is

(v) The percentage of yr gamete produced by YyRr parent will be

In human, the allele for brown eyes (B) is dominant over that for blue eyes (b). A brown eyed woman marries a blue eyed man, and they have six children. Four of the children are brown eyed and two of them are blue eyed. (i) What is the genotype of blue eyed offspring?

(ii) What is the woman's genotype?

(iii) The ovum, produced by the mother carries the gene regarding eye colour is

(iv) The ratio of brown eyed children to blue eyed children in this family is 2 : 1, which deviates from typical phenotypic ratios for monohybrid inheritance. What might be the reason? (a) Gametes carrying the brown eyed allele are more viable then those with the blue eyed allele. (b) A different pattern of inheritance other than monohybrid inheritance is involved. (c) Not all of their babies survived childbirth, thus causing a distortion in the actual ratio. (d) The actual ratio differs from the expected ratio because the sample size is too small. (v) What is the gene carried by of the man's sperm regarding the eye colour?

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Cbse 10th standard science subject heredity and evolution case study questions with solution 2021 answer keys.

(i) (b) : In XX-XO type and XX-XY type of sex determining mechanisms, males produce two different types of gametes, either with or without X-chromosome (XO type), or some gametes with X-chromosome and some with Y-chromosome (XY type). Such type of sex determination mechanism is designated to be the example of male heterogamety. In both, females are homogametic and produce X type of gametes in both the cases and have XX genotype. (ii) (b): The possibility of having a girl or boy child is equal i.e., 50%, as 50% male gametes are Y type and 50% are X type. Fusion of egg with X type sperm will produce a girl child. (iii) (b): In humans, number of autosomes are 2n = 44 or 22 pairs regardless of the sex. (iv) (a):  In XX-XO type and XX-XY type of sex determining mechanisms, males produce two different types of gametes, either with or without X-chromosome (XO type), or some gametes with X-chromosome and some with Y-chromosome (XY type). Such type of sex determination mechanism is designated to be the example of male heterogamety. In both, females are homogametic and produce X type of gametes in both the cases and have XX genotype. (v) (b): Male fruitfly is heterogametic whereas female fruitfly is homogametic.

(i) (a) : Characters studied by Mendel are as follows:

Phenotypic ratio is: 

(i) (c) (ii) (b) : According to the given passage some children show recessive trait, i.e., homozygous. So, the woman must be heterozygous. (iii) (c): Human ova are haploid, hence they only contain one copy of each gene. Since the woman has a Bb genotype her ova would contain either B or b allele. (iv) (d): According to the given passage, within a single family, the sample size of offspring in each generation is very small. Hence, the actual phenotypic and genotypic ratios often deviate from expected ratios. It is only when sample sizes of offspring is large that actual ratios approach theoretical or expected ratios more closely. (v) (c) : Human sperm is haploid, hence they only contain one copy of each gene. Since the man has a bb genotype, his sperm would contain allele b only.

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