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CBSE Case Study Questions Class 11 Physics PDF Download

Are you a Class 11 Physics student looking to enhance your understanding and prepare effectively for your exams? Look no further! In this comprehensive guide, we present a curated collection of CBSE Case Study Questions Class 11 Physics that will help you grasp the core concepts of Physics while reinforcing your problem-solving skills.

CBSE 11th Standard CBSE Physics question papers, important notes, study materials, Previous Year Questions, Syllabus, and exam patterns. Free 11th Standard CBSE Physics books and syllabus online. Important keywords, Case Study Questions, and Solutions.

Class 11 Physics Case Study Questions

CBSE Class 11 Physics question paper will have case study questions too. These case-based questions will be objective type in nature. So, Class 11 Physics students must prepare themselves for such questions. First of all, you should study NCERT Textbooks line by line, and then you should practice as many questions as possible.

Chapter-wise Solved Case Study Questions for Class 11 Physics

• Chapter 1: Physical World
• Chapter 2: Units and Measurements
• Chapter 3: Motion in a Straight Line
• Chapter 4: Motion in a Plane
• Chapter 5: Laws of Motion
• Chapter 6: Work, Energy, and Power
• Chapter 7: System of Particles and Rotational Motion
• Chapter 8: Gravitation
• Chapter 9: Mechanical Properties of Solids
• Chapter 10: Mechanical Properties of Fluids
• Chapter 11: Thermal Properties of Matter
• Chapter 12: Thermodynamics
• Chapter 13: Kinetic Theory
• Chapter 14: Oscillations
• Chapter 15: Waves

Class 11 students should go through important Case Study problems for Physics before the exams. This will help them to understand the type of Case Study questions that can be asked in Grade 11 Physics examinations. Our expert faculty for standard 11 Physics have designed these questions based on the trend of questions that have been asked in last year’s exams. The solutions have been designed in a manner to help the grade 11 students understand the concepts and also easy-to-learn solutions.

Class 11 Books for Boards

Why Case Study Questions Matter

Case study questions are an invaluable resource for Class 11 Physics students. Unlike traditional textbook exercises, these questions simulate real-life scenarios, challenging students to apply theoretical knowledge to practical situations. This approach fosters critical thinking and helps students build a deep understanding of the subject matter.

Let’s delve into the different topics covered in this collection of case study questions:

1. Motion and Gravitation

In this section, we explore questions related to motion, velocity, acceleration, and the force of gravity. These questions are designed to test your grasp of the fundamental principles governing motion and gravitation.

2. Work, Energy, and Power

This set of questions delves into the concepts of work, energy, and power. You will encounter scenarios that require you to calculate work done, potential and kinetic energy, and power in various contexts.

3. Mechanical Properties of Solids and Fluids

This section presents case study questions about the mechanical properties of solids and fluids. From stress and strain calculations to understanding the behavior of fluids in different situations, these questions cover a wide range of applications.

4. Thermodynamics

Thermodynamics can be a challenging topic, but fear not! This part of the guide offers case study questions that will clarify the laws of thermodynamics, heat transfer, and thermal expansion, among other concepts.

5. Oscillations and Waves

Get ready to explore questions related to oscillations, simple harmonic motion, and wave characteristics. These questions will deepen your understanding of wave propagation and the behavior of oscillatory systems.

6. Kinetic Theory and Laws of Motion

Kinetic theory and the laws of motion can be complex, but with our case study questions, you’ll find yourself mastering these topics effortlessly.

Discover a wide array of questions dealing with light, lenses, and mirrors. This section will improve your problem-solving skills in optics and enhance your ability to analyze optical phenomena.

8. Electrical Effects of Current

Electricity and circuits are fundamental to physics. The case study questions in this section will challenge you to apply Ohm’s law, Kirchhoff’s laws, and other principles in various electrical circuits.

9. Magnetic Effects of Current

Delve into the fascinating world of magnets and magnetic fields. This set of questions will strengthen your understanding of magnetic effects and their applications.

10. Electromagnetic Induction

The final section covers electromagnetic induction, Faraday’s law, and Lenz’s law. You’ll be presented with scenarios that test your ability to predict induced electromotive forces and analyze electromagnetic phenomena.

In conclusion, mastering Class 11 Physics requires a thorough understanding of fundamental concepts and their practical applications. The case study questions provided in this guide will undoubtedly assist you in achieving a deeper comprehension of the subject.

Remember, practice is key! Regularly attempt these case study questions to strengthen your problem-solving abilities and boost your confidence for the exams. Happy studying, and may you excel in your Physics journey!

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Class 11 Physics Case Study Questions

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Looking for complete and comprehensive case study questions for class 11 Physics? myCBSEguide is just a click away! With extensive study materials, sample papers, case study questions and mock tests, myCBSEguide is your one-stop solution for class 11 Physics exam preparation needs. So, what are you waiting for? Log on to myCBSEguide and get started today!

What is the purpose of physics?

Physics is the study of the fundamental principles governing the natural world. It is a vital part of the scientific enterprise, providing the foundation on which other sciences are built. Physics is essential for understanding how the world works, from the smallest particles to the largest structures in the Universe. In class 11 Physics, students are introduced to the basic concepts of physics and learn about the fundamental principles governing the natural world. Class 11 Physics concepts are essential for understanding the world around us and for further study in physics and other sciences.

What are case study questions in physics?

In physics, case study questions are intended to evaluate a student’s ability to apply theoretical principles to real-life situations. These questions usually ask the student to assess data from a specific experiment or setting in order to discover what physical principles are at play. Problem-solving and critical-thinking skills are developed through case study questions, which are an important aspect of physics education.

CBSE Case Study Questions in Class 11 Physics

CBSE Class 11 Physics question paper pattern includes case study questions. Class 11 Physics case study questions assess a student’s ability to apply physics principles to real-world environments. The questions are usually focused on a situation provided in the Class 11 Physics question paper, and they demand the student to answer the problem using their physics knowledge. Class 11 Physics case study questions are an important aspect of the CBSE physics curriculum. Class 11 Physics case study questions are a useful way to assess a student’s expertise in the subject.

Sample Class 11 Physics Case Study Questions

Expert educators at myCBSEguide have created a collection of Class 11 physics case study questions. The samples of Class 11 physics case study questions are given below. Class 11 physics case study questions are designed to test your understanding of the concepts and principles of physics. They are not meant to be easy, but they should be done if you have a good grasp of the subject. So, take a look at the questions and see how you fare. Good luck!

Class 11 Physics Case Study Question 1

Read the case study given below and answer any four subparts: Potential energy is the energy stored within an object, due to the object’s position, arrangement or state. Potential energy is one of the two main forms of energy, along with kinetic energy. Potential energy depends on the force acting on the two objects.

• kinetic energy
• potential energy
• mechanical energy
• none of these
• potential energy decreases
• potential energy increases
• kinetic energy decreases
• kinetic energy increases
• only when spring is stretched
• only when spring is compressed
• both a and b
• 5  ×  10 4  J
• 5  ×  10 5  J

Answer Key:

Class 11 Physics Case Study Question 2

• distance between body
• source of heat
• all of the above
• convection and radiation
• (b) convection
• (d) all of the above
• (a) convection
• (a) increase
• (c) radiation

  Class 11 Physics Case Study Question 3

• internal energy.
• 1 +(T 2 /T 1 )
• (T 1 /T 2 )+1
• (T 1  /T 2 )- 1
• 1 – (T 2  / T 1 )
• increase or decrease depending upon temperature ratio
• first increase and then decrease
• (d) 1- (T 2 / T 1 )
• (b) increase
• (c) constant

Class 11 Physics Case Study Question 4 

• It is far away from the surface of the earth
• Its surface temperature is 10°C
• The r.m.s. velocity of all the gas molecules is more than the escape velocity of the moon’s surface
• The escape velocity of the moon’s surface is more than the r.m.s velocity of all molecules
• T(H 2 ) = T(N 2 )
• T(H 2 ) < T(N 2 )
• T(H 2 ) > T(N 2 )

The given samples of Class 11 Physics case study questions will help Class 11 Physics students to get an idea on how to solve it. These Class 11 Physics case study questions are based on the topics covered in the Class 11 Physics syllabus and are designed to test the student’s conceptual understanding. The questions are of varying difficulty levels and cover a wide range of topics. By solving these Class 11 Physics case study questions, students will be able to develop their problem-solving skills and improve their understanding of the concepts.

Examining Class 11 Physics syllabus

Senior Secondary school education is a transitional step from general education to a discipline-based curriculum concentration. The current curriculum of Class 11 Physics takes into account the rigour and complexity of the disciplinary approach, as well as the learners’ comprehension level. Class 11 Physics syllabus has also been carefully crafted to be similar to international norms.

The following are some of the Class 11 Physics syllabus’s most notable features:

• Emphasis is placed on gaining a fundamental conceptual knowledge of the material.
• Use of SI units, symbols, naming of physical quantities, and formulations in accordance with international standards are emphasised.
• For enhanced learning, provide logical sequencing of subject matter units and suitable placement of concepts with their links.
• Eliminating overlapping concepts/content within the field and between disciplines to reduce the curricular load.
• Process skills, problem-solving ability, and the application of Physics principles are all encouraged.

CBSE Class 11 Physics (Code No. 042)

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CBSE Important Questions for Class 11 Physics

CBSE Important Questions for Class 11 Physics provide you with excellent strategies to prepare for the Physics examination. Questions can be framed from any corner of the book or outside the textbook for the final exams. Thus, you need advanced knowledge rather than practising only through textbooks. This page provides you with CBSE Important Questions Class 11 with medium to advance level Physics questions, helping you to become well-prepared for the competitive examinations.

CBSE Class 11 Physics Important Questions

Important questions for Class 11 Physics are framed according to the NCERT syllabus. Students can click the link below to access the chapter-wise important questions of CBSE Class 11 Physics.

The repeatedly asked questions and the questions of high priority according to the syllabus are provided with answers, at BYJU’S for free. Thus, CBSE Important Questions are essential in building clear concepts and excelling in the Class 11 examination. It plays a major role in helping students face exams confidently and achieve good grades.

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Class 11th Physics - Thermal Properties of Matter Case Study Questions and Answers 2022 - 2023

By QB365 on 09 Sep, 2022

QB365 provides a detailed and simple solution for every Possible Case Study Questions in Class 11 Physics Subject - Thermal Properties of Matter, CBSE. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.

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Thermal properties of matter case study questions with answer key.

11th Standard CBSE

Final Semester - June 2015

Heat is a form of energy which produces the sensation of warmth. It is total thermal energy of the body which is sum of kinetic energies of all the individual molecules of the body. It is transferred from one body to the other on account of temperature difference between two bodies. Joule found that when' mechanical work (W) is converted into heat (Q), then the ratio of Wand Q is always constant, represented by J i.e., Joule's mechanical equivalent of heat. \(J=\frac{W}{Q} \text { or } W=J Q\)   A measure of temperature is obtained using a thermometer that use Physical Properties which change uniformly with temperature, for example, in common liquid in glass thermometers, mercury, alcohol etc are used whose volume varies linearly with temperature over a wide range. (i) Define temperature and its significance. (ii) Define One calorie. (iii) How does a thermometer work? (iv) Name the two convenient fixed reference point for measuring temperature. (v) How celsius temperature and Fahrenheit scale are related to each other? (vi) What is absolute zero temperature? (vii) What is Kelvin scale? How it is related with celsius scale?

When solid is heated, the amplitude of vibration of atoms and molecules increases. Therefore effective interatomic separation increases and cause thermal expansion. Thermal expansion of solids are of three types: (i) Linear expansion (ii) Area expansion (iii) Volume expansion. Thermal expansion of liquid are of two kinds. Real expansion and apparent expansion that occurs in form of volume expansion. Thermal expansion of water is anomalous i.e., volume of given amount of water first decreases with increase in temperature from 0 °C to 4 °C and beyond 4 °C volume of water increases with rise of temperature. In thermal expansion of gases is more than solid and liquid but coefficient of volume expansion is dependent on temperature for gases. (i) On what factors does the coefficient of thermal expansion depend? Write its S.I. unit. (ii) Write the relation between the three coefficients of expansion  \(\alpha, \beta\)  and  \(\gamma\)   for solid. (iii) A body at higher temperature contains more heat. Comment. (iv) Why are clock pendulums usually made of invar? (v) Draw graphical variation of volume and temperature for water. (vi) How is coefficient of thermal expansion of gases related to temperature? (vii) State water equivalent.

States of matter viz: solid, liquid and gas are function of temperature and heat content. During the change of state of a substance, the exchange of heat takes place between the substance and surrounding. In this process temperature of substance remains constant. At certain temperature known as melting point. Both the solid and liquid states of the substance coexist in thermal equilibrium. Similarly, at boiling point both the liquid and vapour states of the substance co-exist in the thermal equilibrium. There are certain substance which on heating directly pass from solid to vapour state without passing through the liquid state. This is sublimation process in which solid changes to vapour state of the substance. Process of change of state depends on pressure and temperature. (i) Define triple point. (ii) Define latent heat of a substance.  (iii) What is principle of calorimetry? (iv) What is effect of pressure on the melting point of a substance? (v) State phenomenon of relegation. (vi) What is boiling point? What is effect of pressure on the boiling point? (vii) What is sublimation?

Three cylindrical rods A, Band C of equal lengths and equal diameters are joined in series as shown in the figure. Their thermal conductivities are 2K, K and 0.5 K respectively. 100°C  \(\begin{array}{|l|l|l|} \hline \mathrm{A} & \mathrm{B} & \mathrm{C} \\ \hline \end{array}\)  0°C In the steady-state, the free ends of rods A and C are at 100 °C and a 0°C respectively. Neglecting loss of heat from the curved surfaces of rods. (i) Determine the temperature of the junction between rods A and B. (ii) Determine the temperature of the junction between rods Band C. (iii) Determine the equivalent thermal conductivity of the combination. (iv) Define coefficient of thermal conductivity of a solid. Write its S.I unit. Two rods A and B are of equal length. Each rod has the ends at temperature T 1  and T 2  What is the condition that will ensure equal rates of flow of heat through the rods A and B?

All bodies emit heat energy from their surface by virtue of their temperature. This heat energy is called radiant energy or thermal radiation. The heat that we receive from the sun is transferred to us by a process which, unlike conduction and convection, does not require the help of a medium in intervening space which is almost free of particles. Radiant energy travels in space as electromagnetic waves in the infra-red region of electromagnetic spectrum. They exhibit the phenomenon of interference, diffraction, and polarization as light does. The emission of radiation from a hot body is expressed in terms of that emitted from a reference body (called the black body) at the same temperature. A black body absorbs and emits radiations of all wavelengths. The total energy E emitted by a unit area of a black body per second is given by E =  \(\sigma T^{4}\)   Where T - is absolute temperature of the body and a is Stefan's constant, if the body is not the perfect black body, then E =  \(\varepsilon \sigma T^{4}\)  , where  \(\varepsilon\)   is the emissivity of the body. (i) Determine the dimensions of Stefan's constant a from Stefan - Boltzman law. (ii) What is S.I unit of Stefan's constant? (iii) In which region of the electromagnetic spectrum do thermal radiation lie? (iv) Which device is used to detect thermal radiation? (v) When a body A at a higher temperature T 1  is surrounded by another body B at a lower temperature T 2 . Write the relation between the rate of loss of heat from body A and temperature. (vi) On what factor does the rate at which energy is radiated by a body depends? (vii) On which parameter does the colour of a star depends upon?

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

Thermal properties of matter case study questions with answer key answer keys.

(i) Temperature of a body is the measure of degree of hotness or coldness. It determines the direction of flow of heat when this body is placed in contact with another body i.e., hotter end to colder end. (ii) One calorie is the amount of heat required at a pressure of I atm. to raise the temperature of 1 gram of water through 1 o C. 1 calorie = 4.186 Joules. (iii) Thermometer is based on change in property of matter with temperature. Some common properties are: (i) variation of volume of liquid with temperature. (ii) variation of pressure with temperature. (iii) variation of resistance of metal with temperature. (iv) variation of thermo emf with temperature of a junction in a thermocouple etc. (iv) Reference point for measuring temperature are steam point and ice point of water at standard pressure. (v)  \(\frac{T_{C}}{100}=\frac{T_{F}-32}{180}\)   (vi) It is the temperature at which pressure P of gas would reduce to zero so also volume V of the gas. It is the lowest attainable temperature. 0 °K = -273.15 °C. (vii) Scale of temperature with its zero at -273.15 °C and size of each degree same as on the celsius scale, is called kelvin scale T K = t °C + 273.15

(i) It is a particular point on the P- T phase diagram representing a particular pressure and temperature at which the substance can co-exist in all the three states viz. Solid, liquid and vapour. (ii) It is the amount of heat energy required to change the state of unit mass of a substance from solid to liquid or from liquid to vapour without any change in temperature. (iii) Calorimeter works on the principle that heat lost by one body is equal to heat gained by other provided no heat escape from system to surrounding in any form. (iv) Melting point of a substance decreases with increase in pressure. (v) Phenomenon of refreezing of ice when pressure is reduced is known as relegation. (vi) The temperature at which the liquid and vapour states of substance are in thermal equilibrium with each other i.e., vapour pressure becomes equal to external pressure. Boiling point of a substance increases with increase in external pressure. (vii) On heating a substance, the change from solid state to vapour state without passing through the liquid state is called sublimation. e.g., camphor, iodine and solid carbon dioxide are sublime substance.

(i) In the steady-state, the rate of flow of heat is the same for all rods. If T 1  and T 2 are the temperatures at the junction points between A, Band C respectively. Then \(\frac{Q}{t}=\frac{K_{A} A\left(100-T_{1}\right)}{d}\)   =  \(\frac{K_{B} A\left(T_{1}-T_{2}\right)}{d}\)   =  \(\frac{K_{C} A\left(T_{2}-0\right)}{d}\)   Given K A =2K 1   K B  = K and K c =0.5K. Hence 2(100 - T 1  ) = (T 1  - T 2 ) = 0.5(T 2 - 0) and T 1  - T 2 = 0.5T 2 T 1  = 85.7 °C. (ii) Since T 1  = 85.7 °C, therefore T 2 = 57.1 °C using 200 - 2T 1  = 0.5T 2 (iii) Since the rods have the same lengths and the same diameters, the equivalent thermal conductivity of the series combination is \(\frac{1}{K_{e}}=\frac{1}{K_{A}}+\frac{1}{K_{B}}+\frac{1}{K_{C}}\)   =  \(\frac{1}{2 K}+\frac{1}{K}+\frac{1}{0.5 K}\)   K e =  \(\frac{2 K}{7}\)   (iv) Coefficient of thermal conductivity of a solid is equal to the rate of flow of heat per unit area per unit temperature gradient across the solid. S.I unit of (Coefficient of thermal conductivity) K is Wm -1 K -1 . (v) As  \(\frac{\Delta Q_{1}}{\Delta t}=\frac{\Delta Q_{2}}{\Delta t}\)   \(\therefore \quad K_{1} A_{1} \frac{\left(T_{1}-T_{2}\right)}{L_{1}}=K_{2} A_{2} \frac{\left(T_{1}-T_{2}\right)}{L_{2}}\)   \(\Rightarrow \quad \frac{A_{1}}{A_{2}}=\frac{K_{2}}{K_{1}}\)   i.e., the cross-sectional area of two rods must be in inverse ratio of their thermal conductivities.

(i) Stefan - Boltzman law states that E =  \(\sigma T^{4}\)   where E - stands for the total energy emitted per unit area per second. Thus dimensions of E = dimensions of  \(\left(\frac{\text { Energy }}{\text { area } \times \text { time }}\right)\)   i.e.,  \(\frac{\mathrm{ML}^{2} \mathrm{~T}^{-2}}{\mathrm{~L}^{2} \mathrm{~T}}=\mathrm{MT}\)  ,therefore, dimension of \(\sigma=\frac{\mathrm{MT}^{-3}}{\mathrm{~K}^{4}}=\mathrm{MT}^{-3} \mathrm{~K}^{-4}\)   (ii) S.I unit of Stefan's constant is Wm -2 K -4 (iii) Thermal radiations lie in the infrared region of electro magnetic spectrum. (iv) Thermopile is used to detect thermal radiation. (v)  \(E \propto\left(T_{1}^{4}-T_{2}^{4}\right)\)   (vi) The rate at which energy is radiated by a body depends upon. (i) the surface area of the body (ii) the temperature of the body (iii) nature of the surface of the body (iv) the emissivity of the surface of the body. (vii) According to Wein's law  \(\lambda_{\mathrm{m}} \mathrm{T}\)  = Constant. Colour of star depends upon its surface temperature.

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Class 11 Physics Case Study Questions Chapter 3 Motion in a Straight Line

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In Class 11 Final Exams there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Downloads of CBSE Class 11 Physics Chapter 3 Case Study and Passage-Based Questions with Answers were Prepared Based on the Latest Exam Pattern. Students can solve Class 11 Physics Case Study Questions Motion in a Straight Line  to know their preparation level.

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 11 Physics Paper, 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.

Motion in a Straight Line Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 11 Physics  Chapter 3 Motion in a Straight Line

Case Study/Passage-Based Questions

Case Study 1:

When an object is in motion, its position changes with time. But how fast is the position changing with time and in what direction? To describe this, we define the quantity average velocity. Average velocity is defined as the change in position or displacement ( △ x) divided by the time intervals ( △ t), in which the displacement occurs:

Where x2 and x1 are the positions of the object at times t2 and t1, respectively. The SI unit for velocity is m/s or m s–1, although km h–1 is used in many everyday applications. Like displacement, average velocity is also a vector quantity. Average speed is defined as the total path length traveled divided by the total time interval during which the motion has taken place:

Average speed = Total path length/ Total time interval.

Average speed has obviously the same unit (m s –1 ) as that of velocity. But it does not tell us in what direction an object is moving. Thus, it is always positive (in contrast to the average velocity which can be positive or negative). If the motion of an object is along a straight line and in the same direction, the magnitude of displacement is equal to the total path length.

The velocity at an instant is defined as the limit of the average velocity as the time interval Dt becomes infinitesimally small. In other words

Note that for uniform motion, velocity is the same as the average velocity at all instants. Instantaneous acceleration is defined in the same way as the instantaneous velocity

1) For uniform motion instantaneous velocity is the same as

• a) Average velocity
• b) Average acceleration
• c) Instantaneous speed
• d) None of these

Answer: a) Average velocity

2 If velocity is constant then

• a) Acceleration is zero
• b) Acceleration is positive
• c) Acceleration is negative

Answer: a) Acceleration is zero

What is average velocity defined as? a) Total path length / Total time interval b) Displacement / Time interval c) Speed / Direction d) Time interval / Displacement

Answer: b) Displacement / Time interval

Which unit is used for velocity in everyday applications? a) m/s b) m s–1 c) km/h d) Both a and b

Answer:c) km/h

Which of the following is true about average speed? a) It is a vector quantity b) It can be negative c) It is always positive d) It describes the direction of motion

Answer: c) It is always positive

Case Study 2:

When an object is in motion, its position changes with time. So, the quantity that describes how fast is the position changes w.r.t. time and in what direction is given by average velocity. It is defined as the change in position or displacement (Δx ) divided by the time interval (Δt ) in which that displacement occurs. However, the quantity used to describe the rate of motion over the actual path is average speed. It is defined as the total distance traveled by the object divided by the total time taken.

(i) A 250 m long train is moving with a uniform velocity of 45 km/h. The time taken by the train to cross a bridge of length 750 m is (a) 56 s (b) 68 s (c) 80 s (d) 92 s

Answer: (c) 80 s

(ii) A truck requires 3 hr to complete a journey of 150 km. What is the average speed? (a) 50 km/h (b) 25 km/h (c) 15 km/h (d) 10 km/h

Answer: (a) 50 km/h

(iii) Average speed of a car between points A and B is 20 m/s, between B and C is 15 m/s and between C and D is 10 m/s. What is the average speed between A and D, if the time taken in the mentioned sections is 20s, 10s and 5s, respectively? (a) 17.14 m/s (b) 15 m/s (c) 10 m/s (d) 45 m/s

Answer: (a) 17.14 m/s

(iv) A cyclist is moving on a circular track of a radius of 40 m and completes half a revolution in 40 s. Its average velocity (in m/s) is (a) zero (b) 2 (c) 4π (d) 8π

Answer: (b) 2

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Case Study Questions Class 11 Physics Oscillations

Case study questions class 11 physics chapter 14 oscillations.

CBSE Class 11 Case Study Questions Physics Oscillations. Important Case Study Questions for Class 11 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Oscillations.

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 11 Physics Oscillations

Case study – 1.

A motion that repeats itself at regular intervals of time is called periodic motion. Very often, the body undergoing periodic motion has an equilibrium position somewhere inside its path. When the body is at this position no net external force acts on it. Therefore, if it is left there at rest, it remains there forever. If the body is given a small displacement from the position, a force comes into play which tries to bring the body back to the equilibrium point, giving rise to oscillations or vibrations . Every oscillatory motion is periodic, but every periodic motion need not be oscillatory. Circular motion is a periodic motion, but it is not oscillatory. The smallest interval of time after which the motion is repeated is called its period. Let us denote the period by the symbol T. Its SI unit is second. The reciprocal of T gives the number of repetitions that occur per unit time. This quantity is called the frequency of the periodic motion. It is represented by the symbol n. The relation between n and T is n = 1/T. The unit of n is thus s -1 . After the discoverer of radio waves, Heinrich Rudolph Hertz (1857–1894), a special name has been given to the unit of frequency. It is called hertz (abbreviated as Hz). Answer the following.

1) Every oscillatory motion is periodic motion true or false?

2) Circular motion is

a) Oscillatory motion

b) Periodic motion

c) Rotational motion

d) None of these

3) Define period. Give its SI unit and dimensions

4) Define frequency of periodic motion. How it is related to time period

5) What is oscillatory motion

Answer key – 1

3) The smallest interval of time after which the motion is repeated is called its period. Its SI unit is second and dimensions are [T 1 ].

4) Reciprocal of Time period (T) gives the number of repetitions that occur per unit time. This quantity is called the frequency of the periodic motion. It is represented by the symbol n. The relation between n and T is n = 1/T i.e. they are inversely proportional to each other. The unit of n is thus s -1 or hertz.

5) Oscillatory motion is type of periodic motion in which body performs periodic to and fro motion about some mean position. Every oscillatory motion is periodic, but every periodic motion need not be oscillatory.

Case Study – 2

There are no physical examples of absolutely pure simple harmonic motion. In practice we come across systems that execute simple harmonic motion approximately under certain conditions.

Oscillations due to a spring:

The simplest observable example of simple harmonic motion is the small oscillations of a block of mass m fixed to a spring, which in turn is fixed to a rigid wall. The block is placed on a frictionless horizontal surface. If the block is pulled on one side and is released, it then executes a to and fro motion about the mean position. Let x = 0, indicate the position of the centre of the block when the spring is in equilibrium. The positions marked as –A and +A indicate the maximum displacements to the left and the right of the mean position. We have already learnt that springs have special properties, which were first discovered by the English physicist Robert Hooke. He had shown that such a system when deformed is subject to a restoring force, the magnitude of which is proportional to the deformation or the displacement and acts in opposite direction. This is known as Hooke’s law. It holds good for displacements small in comparison to the length of the spring. At any time t, if the displacement of the block from its mean position is x, the restoring force F acting on the block is,

F (x) = –k x

The constant of proportionality, k, is called the spring constant, its value is governed by the elastic properties of the spring. A stiff spring has large k and a soft spring has small k. Equation is same as the force law for SHM and therefore the system executes a simple harmonic motion.

Damped oscillations

We know that the motion of a simple pendulum, swinging in air, dies out eventually. Why does it happen? This is because the air drag and the friction at the support oppose the motion of the pendulum and dissipate its energy gradually. The pendulum is said to execute damped oscillations. In damped oscillations, the energy of the system is dissipated continuously; but, for small damping, the oscillations remain approximately periodic. The dissipating forces are generally the frictional forces.

The damping force is generally proportional to velocity of the bob and acts opposite to the direction of velocity. If the damping force is denoted by F d , we have

where the positive constant b depends on characteristics of the medium (viscosity, for example) and the size and shape of the block, is usually valid only for small velocity.

1) Damping force is directly proportional to

a) Velocity

c) Acceleration

2) Oscillations due to spring performs SHM for

a) Only small oscillations of spring

b) Only for large oscillations of spring

c) Both large as well as small oscillations of spring

3) Give expression for restoring force in spring while performing small SHM oscillations.

4) Explain damped oscillations

5) Explain oscillations due to spring

Answer key-2

3) At any time t, if the displacement of the block from its mean position is x, the restoring force F acting on the block is,

The constant of proportionality, k, is called the spring constant, its value is governed by the elastic properties of the spring

4) In the motion of a simple pendulum, swinging in air amplitude became zero after some time. This is because the air drag and the friction oppose the motion of the pendulum and dissipate its energy gradually. The pendulum is said to execute damped oscillations. In damped oscillations, the energy of the system is dissipated continuously. The damping force is generally proportional to velocity of the bob and acts opposite to the direction of velocity. If the damping force is denoted by F d , we have F d = –b v. Where the positive constant b depends on characteristics of the medium and the size and shape of the block.

5) the small oscillations of a block of mass m fixed to a spring, which in turn is fixed to a rigid wall. The block is placed on a frictionless horizontal surface. If the block is pulled on one side and is released, it then executes to and fro motion about the mean position. Let x = 0, indicate the position of the centre of the block when the spring is in equilibrium. We know that springs have special property that when deformed is subject to a restoring force, the magnitude of which is proportional to the deformation or the displacement and acts in opposite direction. It holds good for displacements small in comparison to the length of the spring. At any time t, if the displacement of the block from its mean position is x, the restoring force F acting on the block is,

Case Study – 3

When a system (such as a simple pendulum or a block attached to a spring) is displaced from its equilibrium position and released, it oscillates with its natural frequency ω, and the oscillations are called free oscillations. All free oscillations eventually die out because of the ever present damping forces. However, an external agency can maintain these oscillations. These are called forced or driven oscillations. We consider the case when the external force is itself periodic, with a frequency w d called the driven frequency. The most important fact of forced periodic oscillations is that the system oscillates not with its natural frequency ω, but at the frequency ω d of the external agency; the free oscillations die out due to damping. The most familiar example of forced oscillation is when a child in a garden swing periodically presses his feet against the ground (or someone else periodically gives the child a push) to maintain the oscillations. The maximum possible amplitude for a given driving frequency is governed by the driving frequency and the damping, and is never infinity. The phenomenon of increase in amplitude when the driving force is close to the natural frequency of the oscillator is called resonance . In our daily life, we encounter phenomena which involve resonance. Your experience with swings is a good example of resonance. You might have realized that the skill in swinging to greater heights lies in the synchronization of the rhythm of pushing against the ground with the natural frequency of the swing.

1) When a system oscillates with its natural frequency ω, and the oscillations are called

a) Free oscillations

b) Forced oscillations

2) All free oscillations eventually die out because of

a) Damping force

b) electromagnetic force

c) None of these

3) What is free oscillation?

4) What is forced oscillations?

5) What is resonance?

Answer key – 3

3) When a system (such as a simple pendulum or a block attached to a spring) is displaced from its equilibrium position and released, it oscillates with its natural frequency ω, and the oscillations are called free oscillations.

4) Forced oscillations are oscillations where external force drives the oscillations with frequency given by external force.

5) The phenomenon of increase in amplitude when the driving force is close to the natural frequency of the oscillator is called resonance. In our daily life, we encounter phenomena which involve resonance. Your experience with swings is a good example of resonance. You might have realized that the skill in swinging to greater heights lies in the synchronization of the rhythm of pushing against the ground with the natural frequency of the swing.

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Case Study Questions for Class 11 Physics Chapter 9 Mechanical Properties of Solids

• Last modified on: 10 months ago
• Reading Time: 4 Minutes

Case Study Questions:

Question 1:

The graph shown below shows qualitatively the relation between the stress and the strain as the deformation gradually increases. Within Hooke’s limit for a certain region stress and strain relation is linear. Beyond that up to a certain value of strain the body is still elastic and if deforming forces are removed the body recovers its original shape.

1. If deforming forces are removed up to which point the curve will be retraced?

(a) upto OA only

(b) upto OB

(d) Never retraced its path

2. In the above question, during loading and unloading the force exerted by the material are conservative up to

(a) OA only

(b) OB only

(c) OC only

(d) OD only

3. During unloading beyond B , say C , the length at zero stress in now equal to

(a) less than original length

(b) greater than original length

(c) original length

(d) can’t be predicted

4. The breaking stress for a wire of unit cross-section is called

(a) yield point

(b) elastic fatigue

(c) tensile strength

(d) Young’s modulus

5. Substances which can be stretched to cause large strains are called

(a) isomers

(b) plastomers

(c) elastomers

(d) polymers

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