case study of class 11 physics

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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 Sample Papers, Notes | NCERT Solutions

Get our premium content for CBSE class 11 Physics in the form of Sample Question Papers, Notes,  Exemplar Solutions, NCERT Solutions & Question Bank as PDF tailor-made for the toppers.

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Cbse last year papers, user submitted papers, case study questions,   mock tests, units and measurements, motion in a straight line, motion in a plane, laws of motion, work energy and power, system of particles and rotational motion, gravitation, mechanical properties of solids, mechanical properties of fluids, thermal properties of matter, thermodynamics, kinetic theory, oscillations.

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CBSE class 11 Physics solved sample question papers, NCERT textbook answers, revision notes, and guess papers for free download, online practice tests in MCQ format for CBSE, IIT JEE, AIPMT, NEET, and other entrance exams along with high-quality free videos. 

CBSE Class 11 Physics Study Material

There is a transition from general education to a discipline-based focus on the curriculum at the senior secondary stage of school education. Hence, young learners need to pay extra attention to the preparation for their board examinations. For CBSE Class 11 Physics quality study material like NCERT exemplar solutions, the latest sample question papers, test papers, and chapter-wise quick revision notes students can check our website . Here you can also find learning videos for class 11 Physics for a better understanding of the chapter.

CBSE Class 11 Physics Syllabus

Physics as a subject in the senior secondary stage of school education aims to develop conceptual competence in the learners and make them realize and appreciate the interface of Physics with other disciplines. Therefore, it becomes very important for the students at this stage to prepare vigorously in concurrence with the updated syllabus. Those who are looking for a reliable stop to get everything for Class 11 Physics like syllabus, sample papers, notes, and NCERT Solutions may download the myCBSEguide App .

A syllabus is subject to change. This change may not be very big but there are small changes that are mostly accommodated in the syllabus. That is the reason students must know their syllabus well. Given below are the chapter names of the present CBSE Class 11 Physics syllabus.

COURSE STRUCTURE

• Class XI – 2022-23 (Theory)
• Unit–I Physical World and Measurement
• Unit-II Kinematics
• Unit–III Laws of Motion
• Unit–IV Work, Energy, and Power
• Unit–V Motion of System of Particles and Rigid Body
• Unit-VI Gravitation
• Unit–VII Properties of Bulk Matter
• Unit–VIII Thermodynamics
• Unit–IX Behaviour of Perfect Gases and Kinetic Theory of Gases
• Unit–X Oscillations and Waves

The CBSE senior secondary Physics basically aims to expose the learners to different processes used in Physics-related industrial and technological applications. Therefore, the topics and chapters have been thoughtfully chosen. For detailed information on the syllabus, you can check Class 11 Physics Syllabus 2023 .

CBSE Class 11 Physics Revision Notes

It is impossible to get good marks without understanding the key concepts properly. Physics is a subject of theories and formulae, one has to know them well in order to answer the questions based on them. For this revision notes become important. You can download the revision notes for CBSE Class 11 Physics from myCBSEguide which has explanations of important topics in layman’s language. Students can make the best use of these notes for their preparations. The Physics revision notes are helpful in understanding the concepts easily.

CBSE Class11 Physics NCERT Exemplar Solutions

A complete knowledge of NCERT is a must for any CBSE subject.  Students of senior secondary science need to focus more on the NCERT textbook solutions and Exemplar Solutions. The best part is our class NCERT solutions are available free of cost on our students’ dashboard with a simple registration. Get the Class 11 Physics NCERT Solutions with detailed answers. Students can also learn from the video solution for better understanding. The Physics exemplar solutions can also be accessed which are available for download.

CBSE Class 11 Physics Question Bank

There is a dynamic range of questions that the students need to be aware of. These questions can be multiple choice questions, case study questions, competency-based objective questions, and description subjective questions. The question bank of myCBSEguide is very rich in this matter and has numerous questions for every type. To get the best and latest question type for CBSE Class 11 Physics you must check our website. Our question bank is revived even and accommodates even a subtle change in the syllabus.

CBSE Class 11 Physics Sample Papers

Based on the CBSE question paper pattern, the myCBSEguide model question papers are one of our top-selling products. Students are advised to solve as many sample papers as they can because sample papers reflect the original question paper. Practicing sample papers drives away stress and boosts the confidence of the students. The class 11 Physics sample papers with the latest blueprint are now available on the myCBSEguide app. For more information check out Class 11 Physics Sample Paper 2023 .

Class 11 Physics Previous Year Questions & Practice Papers

You can find previous years’ question papers for class 11 Physics on our student dashboard absolutely free. In fact, you can check CBSE Previous Years Paper for all the subjects here. These are the most important question for senior secondary students from the board exam perspective.

The CBSE has released practice papers for the main subjects. Students who would be sitting for the upcoming boards must thoroughly revise these papers before sitting for their exams. You can find the class 11 Physics Practice papers 2023 and begin your preparation right away.

CBSE Class 11 Physics Case Study Questions

The senior secondary Physics curriculum is designed to promote problem-solving abilities and creative thinking in learners. The CBSE has incorporated the concept of competency-based education (CBE) by including a new model of questions called Case-based questions or simply case study questions. Our CBSE Class 11 Physics case study question has been prepared by senior CBSE teachers and is sure to give efficient outcomes.

Our Class 11 Physics Case Study Questions  will help to develop conceptual competence in the learners and make them realize and appreciate the interface of Physics with other disciplines.

CBSE Class 11 Physics Test Papers & Online Tests

The chapter-based test can be a good way to achieve small targets. The test papers of class 11 Physics help in providing logical sequencing of units of the subject matter and proper placement of concepts with their linkage for better learning.

Along with the test papers, students can also test their acquired knowledge through our online MCQ tests. This can fill the gap during the preparation of a particular chapter. These Physics test papers and Physics online tests can ease the burden of completing the whole syllabus before taking a test. These tests can opt for chapter-wise as well.

Class 11 Physics Case Study Questions

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 …

CBSE Class 11 Physics Syllabus 2022-23

CBSE Class 11 Physics Syllabus 2022-23 includes Units and Measurements, Motion in a Straight Line, Work, Energy and Power, System of Particles and Rotational Motion, Thermal Properties of Matter etc for the session 2022 – 2023. Here is the detailed syllabus. To download class 11 Physics CBSE latest sample question …

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Class 11 Physics Case Study Questions Chapter 4 Motion In A Plane

• Post author: studyrate
• Post published:
• Post category: Class 11
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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 4 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 Plane  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 Plane Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 11 Physics  Chapter 4 Motion In A Plane

Case Study/Passage-Based Questions

Case Study 1: When an object follows a circular path at a constant speed, the motion of the object is called uniform circular motion. The word “uniform” refers to the speed, which is uniform (constant) throughout the motion. Suppose an object is moving with uniform speed v in a circle of radius R Since the velocity of the object is changing continuously in direction, the object undergoes acceleration. Let us find the magnitude and the direction of this acceleration. Thus, the acceleration of an object moving with speed v in a circle of radius R has a magnitude V2/R and is always directed towards the center. This is why this acceleration is called centripetal acceleration (a term proposed by Newton). A thorough analysis of centripetal acceleration was first published in 1673 by the Dutch scientist Christiaan Huygens (1629-1695) but it was probably known to Newton also some years earlier. “Centripetal” comes from a Greek term that means ‘center-seeking’. Since v and R are constant, the magnitude of the centripetal acceleration is also constant. However, the direction changes pointing always toward the center. Therefore, centripetal acceleration is not a constant vector. We can express centripetal acceleration ac in terms of angular speed as

a c  = ω 2 R

The time taken by an object to make one revolution is known as its time period T and the number of revolutions made in one second is called its frequency v (=1/ T ). However, during this time the distance moved by the object is  s  = 2π R . Therefore,  v  = 2π R / T  =2π Rv  In terms of frequency n, we have

v  = 2π Rv

ac  = 4π 2 v 2 R

1) SI unit of angular velocity is

d) None of these

Answer: a) Rev/sec

2) A centripetal acceleration is not a constant vector. True or false?

Answer: a) True

3) What does the term “uniform” refer to in uniform circular motion? a) Constant acceleration b) Constant radius c) Constant velocity d) Constant speed

Answer: d) Constant speed

4) How is the direction of centripetal acceleration characterized? a) Always pointing outward b) Always pointing toward the center c) Constant in one direction d) Changing randomly

Answer: b) Always pointing toward the center

5) Who first published a thorough analysis of centripetal acceleration? a) Isaac Newton b) Albert Einstein c) Christiaan Huygens d) Galileo Galilei

Answer: c) Christiaan Huygens

Case Study 2: We consider the motion of a projectile. An object that is in flight after being thrown or projected is called a projectile. Such a projectile might be a football, a cricket ball, a baseball or any other object. The motion of a projectile may be thought of as the result of two separate, simultaneously occurring components of motion. One component is along a horizontal direction without any acceleration and the other is along the vertical direction with constant acceleration due to the force of gravity. It was Galileo who first stated this independency of the horizontal and the vertical components of projectile motion in his Dialogue on the great world systems.

Horizontal range of a projectile:  The horizontal distance traveled by a projectile from its initial position (x = y = 0) to the position where it passes y = 0 during its fall is called the horizontal range, R. It is the distance traveled during the time of flight T f . Therefore, the range

R is R = ( v 0  cos θ 0 ) ( T f )

R = (v 0  cos θ 0 ) (2 v 0  sin θ 0 )/g

R = (v 0 2  sin 2 θ 0 )/g

This shows that for a given projection velocity, R is maximum when sin 2θ 0  is maximum, i.e., when  θ 0  = 45 0 . The maximum horizontal range is, therefore

R= v 0 2 /g

Maximum height of a projectile:  Maximum height that can be achieved during projectile and it is given by

H m  = (v 0  sin θ 0 ) 2 /2g

Who first stated the independency of horizontal and vertical components of projectile motion? a) Isaac Newton b) Albert Einstein c) Galileo Galilei d) Johannes Kepler

Answer: c) Galileo Galilei

The horizontal range is directly dependent on: a) The initial velocity and angle of projection b) The maximum height and time of flight c) Gravity and maximum height d) Only the initial velocity

Answer: a) The initial velocity and angle of projection

At what angle θ is the horizontal range of the projectile maximum? a) 30° b) 45° c) 60° d) 90°

Answer: b) 45°

Hope the information shed above regarding Case Study and Passage Based Questions for Class 11 Physics Chapter 4 Motion In A Plane with Answers Pdf free download has been useful to an extent. If you have any other queries about CBSE Class 11 Physics Motion In A Plane 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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• Electric Charges and Fields Class 12 Case Study Questions Physics Chapter 1

Last Updated on September 4, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 12 physics. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 12 physics. In this article, you will find case study questions for cbse class 12 physics chapter 1 Electric Charges and Fields.

Table of Contents

Case Study Questions on Electric Charges and Fields

Question 1:

Surface charge density is defined as charge per unit surface area of surface charge distribution. i.e., $\sigma=\frac{d q}{d s}$. Two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs having magnitude of $17.0 \times 10^{-22} \mathrm{Cm}^{-2}$ as shown. The intensity of electric field at a point is $E=\frac{\sigma}{\varepsilon_0}$, where $\varepsilon_0=$ permittivity of free space.

(i) $E$ in the outer region of the first plate is (a) $17 \times 10^{-22} \mathrm{~N} / \mathrm{C}$ (b) $1.5 \times 10^{-25} \mathrm{~N} / \mathrm{C}$ (c) $1.9 \times 10^{-10} \mathrm{~N} / \mathrm{C}$ (d) zero (ii) $E$ in the outer region of the second plate is (a) $17 \times 10^{-22} \mathrm{~N} / \mathrm{C}$ (b) $1.5 \times 10^{-15} \mathrm{~N} / \mathrm{C}$ (c) $1.9 \times 10^{-10} \mathrm{~N} / \mathrm{C}$ (d) zero (iii) $E$ between the plates is (a) $17 \times 10^{-22} \mathrm{~N} / \mathrm{C}$ (b) $1.5 \times 10^{-15} \mathrm{~N} / \mathrm{C}$ (c) $1.9 \times 10^{-10} \mathrm{~N} / \mathrm{C}$ (d) zero (iv) The ratio of $E$ from right side of $B$ at distances 2 cm and 4 cm , respectively is (a) $1: 2$ (b) $2: 1$ (c) $1: 1$ (d) $1: \sqrt{2}$ (v) In order to estimate the electric field due to a thin finite plane metal plate, the Gaussian surface considered is (a) spherical (b) cylindrical (c) straight line (d) none of these

(i) Option (d) is correct.

There are two plates $A$ and $B$ having surface charge densities,

$$ \sigma_A=17.0 \times 10^{-22} \mathrm{C} / \mathrm{m}^2 $$

on $A$ and $\sigma_B=-17.0 \times 10^{-22} \mathrm{C} / \mathrm{m}^2$ on $B$, respectively. According to Gauss’ theorem, if the plates have same surface charge density but having opposite signs, then the electric field in region I is zero.

$$ E_{\mathrm{I}}=E_A+E_B=\frac{\sigma}{2 \varepsilon_0}+\left(-\frac{\sigma}{2 \varepsilon_0}\right)=0 $$

(ii) (d): The electric field in region III is also zero.

$$ E_{\mathrm{III}}=E_A+E_B=\frac{\sigma}{2 \varepsilon_0}+\left(-\frac{\sigma}{2 \varepsilon_0}\right)=0 $$

(iii) (c): In region II or between the plates, the electric field

$$ \begin{aligned} & E_{\mathrm{II}}=E_A-E_B=\frac{\sigma}{2 \varepsilon_0}+\frac{\sigma}{2 \varepsilon_0} \\ &=\frac{\sigma\left(\sigma_A \text { or } \sigma_B\right)}{\varepsilon_0}=\frac{17.0 \times 10^{-22}}{8.85 \times 10^{-12}} \\ & E=1.9 \times 10^{-10} \mathrm{NC}^{-1} \end{aligned} $$

(iv) (c): Since, electric field due to an infinite-plane sheet of charge does not depend on the distance of observation point from the plane sheet of charge. So, for the given distances, the ratio of $E$ will be $1: 1$. (v) (b): In order to estimate the electric field due to a thin finite plane metal plate, we take a cylindrical cross-sectional area $A$ and length $2 r$ as the gaussian surface.

Case study questions for other chapters of class 12 physics is given below.

Case Study Questions for Class 12 Physics

We hope the given case study questions for Electric Charges and Fields Class 12 helps you in your learning.

Topics from which case study questions may be asked

• Electric charges
• Conservation of charge
• Coulomb’s law – force between two-point charges
• Forces between multiple charges
• Superposition principle
• Continuous charge distribution
• Electric field
• Electric field due to a point charge
• Electric field lines
• Electric dipole
• Electric field due to a dipole
• Torque on a dipole in a uniform electric field
• Electric flux
• Statement of Gauss’s theorem
• Applications of Gauss’s theorem to find field due to: Infinitely long straight wire Uniformly charged infinite plane sheet Uniformly charged thin spherical shell (field inside and outside)

Two electric field lines never cross each other. If they intersect, then there will be two directions of electric field at the point of intersection which is not possible.

For further practice on case study questions related to Electric Charges and Fields Class 12 Physics, we recommend exploring the link given below.

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Step 1: Click on the given link. You will see the below screen.

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Step 3: Click on start assessment. Now you are ready to take test.

Frequently Asked Questions (FAQs) on Electric Charges and Fields Case Study Questions

Q1: what are case study questions for cbse examinations.

A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.

Q2: Why are case study questions important for understanding class 12 physics chapters?

A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.

Q3: How should students approach answering case study questions for CBSE?

A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of chemical reactions and equations, and formulate well-supported solutions or responses.

Q4: Are there any resources available online for students to practice case study questions on class 12 physics chapters for CBSE exams?

A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our  website  to access these questions and enhance your learning experience. If you need more case study questions for your preparation, then you visit Physics Gurukul website.

Q5: How can students effectively prepare for case study questions on “Electric Charges and Fields” for CBSE exams?

A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.

Q6: How can teachers incorporate case study questions on “Electric Charges and Fields” class 12 physics into classroom teaching?

A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of “Electric Charges and Fields”.

Q7: Electrostatic forces are much stronger than gravitational forces. Give one example.

A7: A charged glass rod can lift a piece of paper against the gravitational pull of the earth on this piece.

Q8: What is an electric line of force? What is its importance?

A8: An electric line of force is an imaginary straight or curved path along which a small positive test charge is supposed to move when free to do so. The tangent at a point on an electric line of force gives the direction of the resultant electric field at that point. The relative closeness of electric lines of force in a certain region provides us an estimate of the electric field strength in that region

Q9: Can a charged body attract another uncharged body? Explain.

A9: Yes, a charged body can attract another uncharged body. When the charged body is placed near the uncharged body, the induced charges of opposite kind are produced on the uncharged body and the uncharged body is attract by charged body.

Q10: In Coulomb’s law, on what factors the value of electrostatic force constant K depends?

A10: It depends on the nature of medium between the two charges and also on the system of units.

Q11: Is the mass of a body affected on charging?

A11: Yes, very slightly. The negatively charged body gains mass also along with electrons.

Q12: How does a free electron at rest move in an electric field?

A12: When the electron is released, it will move in a direction opposite to the direction of electric field.

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Case Study Questions for Class 11 Physics Chapter 10 Mechanical Properties of Fluids

• Last modified on: 1 year ago
• Reading Time: 6 Minutes

Case Study Questions:

Question 1:

The property due to which the free surface of liquid tends to have minimum surface area and behaves like a stretched membrane is called surface tension. It is a force per unit length acting in the plane of interface between the liquid and the bounding surface i.e ., S = F/L, where F = force acting on either side of imaginary line on surface and L = length of imaginary line. Surface tension decreases with rise in temperature. Highly soluble impurities increases surface tension and sparingly soluble impurities decreases surface tension.

1. The excess pressure inside a soap bubble is three times than excess pressure inside a second soap bubble, then the ratio of their surface area is

2. Which of the following statements is not true about surface tension?

(a) A small liquid drop takes spherical shape due to surface tension.

(b) Surface tension is a vector quantity.

(c) Surface tension of liquid is a molecular phenomenon.

(d) Surface tension of liquid depends on length but not on the area.

3. Which of the following statement is not true about angle of contact?

(a) The value of angle of contact for pure water and glass is zero.

(b) Angle of contact increases with increase in temperature of liquid.

(c) If the angle of contact of a liquid and a solid surface is less than 90°, then the liquid spreads on the surface of solid.

(d) Angle of contact depend upon the inclination of the solid surface to the liquid surface.

4. Which of the following statements is correct?

(a) Viscosity is a vector quantity.

(c) Reynolds number is a dimensionless quantity.

(d) Angle of contact is a vector quantity.

5. A liquid does not wet the solid surface if the angle of contact is

(b) equal to 45°

(c) equal to 90°

(d) greater than 90°

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Case Study Questions Class 11 Physics Waves

Case study questions class 11 physics chapter 15 waves.

CBSE Class 11 Case Study Questions Physics Waves. 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 Waves.

CBSE Case Study Questions Class 11 Physics Waves

Case study – 1.

When we speak, the sound moves outward from us, without any flow of air from one part of the medium to another. The disturbances produced in air are much less obvious and only our ears or a microphone can detect them. These patterns, which move without the actual physical transfer or flow of matter as a whole, are called waves. The most familiar type of waves such as waves on a string, water waves, sound waves, seismic waves, etc. is the so-called mechanical waves. These waves require a medium for propagation, they cannot propagate through vacuum. They involve oscillations of constituent particles and depend on the elastic properties of the medium. The electromagnetic waves that you will learn in Class XII are a different type of wave. Electromagnetic waves do not necessarily require a medium – they can travel through vacuum. Light, radio waves, X-rays, are all electromagnetic waves. We have seen that motion of mechanical waves involves oscillations of constituents of the medium. If the constituents of the medium oscillate perpendicular to the direction of wave propagation, we call the wave a transverse wave. If they oscillate along the direction of wave propagation, we call the wave a longitudinal wave. In transverse waves, the particle motion is normal to the direction of propagation of the wave. Therefore, as the wave propagates, each element of the medium undergoes a shearing strain. Transverse waves can, therefore, be propagated only in those media, which can sustain shearing stress, such as solids and not in fluids. Fluids, as well as, solids can sustain compressive strain; therefore, longitudinal waves can be propagated in all elastic media.

1) Air can sustain

d) none of these

3) Define Transverse waves

Answer key-1

4) If oscillations of constituents of the medium are along the direction of wave propagation that is parallel to direction of propagation we call the wave a longitudinal wave.

5) Following are differentiation points

Case Study – 2

a) a rigid boundary

Answer key – 2

3) A wave travelling in one direction will get reflected at one end, which in turn will travel and get reflected from the other end. This will go on until there is a steady wave pattern set up on the string. This wave remains steady in medium and does not travel further such wave patterns are called standing waves or stationary waves.

4) If the boundary is rigid, a pulse travelling along a stretched string and being reflected by the boundary. The reflected wave has the same shape as the incident pulse i.e. crest is reflected as crest and trough as trough but it suffers a phase change of π or 180 0 on reflection. This is because the boundary is rigid and the disturbance must have zero displacement at all times at the boundary. By the principle of superposition, this is possible only if the reflected and incident waves differ by a phase of π, so that the resultant displacement is zero. This reasoning is based on boundary condition on a rigid wall.

Case Study – 3

c) υ = (υ 1- υ 2)/2

b) decrease

Answer key – 3

d) Astrophysicists use it to measure the velocities of stars. Doctors use it to study heart beats and blood flow in different parts of the body.

e) Doctors use it to study heart beats and blood flow in different parts of the body. Here they use ultrasonic waves, and in common practice, it is called sonography. Ultrasonic waves enter the body of the person, some of them are reflected back, and give information about motion of blood and pulsation of heart valves, as well as pulsation of the heart of the foetus. In the case of heart, the picture generated is called echocardiogram.

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