9th science case study questions

Class 9 Science Case Study Questions PDF Download

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Class 9 Science Case Study Questions play a crucial role in the field of science education as they provide real-life scenarios for students to analyze, apply their knowledge, and develop problem-solving skills. This article aims to present a comprehensive collection of case study questions for Class 9 Science , covering various topics and concepts.

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CBSE Class 9 Science Exam will have a set of questions based on case studies in the form of MCQs. The CBSE Class 9 Science Question Bank on Case Studies, provided in this article, can be very helpful to understand the new format of questions. Share this link with your friends.

If you want to want to prepare all the tough, tricky & difficult questions for your upcoming exams, this is where you should hang out.  CBSE Case Study Questions for Class 9  will provide you with detailed, latest, comprehensive & confidence-inspiring solutions to the maximum number of Case Study Questions covering all the topics from your  NCERT Text Books !

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CBSE Class 9th SCIENCE Chapterwise Case Study Question & Solution

Case study questions provide students with real-life scenarios that require critical thinking and application of scientific concepts. They help students understand the practical application of scientific principles and develop problem-solving skills in various scientific disciplines.

Chapterwise Case Study Questions for Class 9 Science

Inboard 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. For Science subjects, there would be 5 case-based sub-part questions, wherein a student has to attempt 4 sub-part questions.

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

The above  Case studies for Class 9 Science  will help you to boost your scores as Case Study questions have been coming in your examinations. These CBSE Class 9 Science Case Studies have been developed by experienced teachers of schools.studyrate.in for the benefit of Class 10 students.

Class 9 Maths Case Study Questions

Benefits of Case Studies in Science Education

Case studies offer several advantages over traditional teaching methods. Here are some key benefits:

• Real-World Application : Case studies present authentic scenarios, enabling students to understand how scientific concepts are applied in real-life situations.
• Critical Thinking : Analyzing case studies requires students to think critically, make connections, and apply scientific knowledge to solve problems.
• Interdisciplinary Approach : Case studies often involve multiple scientific disciplines, fostering an interdisciplinary understanding of complex issues.
• Engagement and Active Learning : Case studies actively engage students in the learning process, promoting active participation, discussion, and collaboration.
• Skill Development : Case studies develop essential skills such as analytical thinking, problem-solving, and effective communication of scientific concepts.

Importance of Practicing Case Study Questions

Practicing case study questions is crucial for Class 9 Science students to enhance their understanding and application of scientific concepts. Here’s why it is important:

• Application of Knowledge : Case studies allow students to apply their theoretical knowledge to practical situations, bridging the gap between theory and real-world scenarios.
• Developing Analytical Skills : Analyzing case studies improves students’ ability to identify relevant information, make connections, and draw logical conclusions.
• Problem-Solving Skills : Case studies present complex problems that require students to think critically and develop effective problem-solving strategies.
• Enhanced Exam Performance : Practicing case study questions familiarizes students with the format and types of questions they may encounter in exams, leading to improved performance.

Subjects Covered in the Case Study Questions for Class 9 Science

The case study questions for Class 9 Science cover the following subjects:

• Motion and Forces
• Light and Reflection
• Electricity
• Matter and Its Properties
• Atoms and Molecules
• Structure of the Atom
• Chemical Reactions
• Cell: The Fundamental Unit of Life
• Diversity in Living Organisms
• Natural Resources

Tips for Approaching Case Study Questions

To tackle case study questions effectively, consider the following tips:

• Read Carefully : Pay close attention to the details provided in the case study, as they hold crucial information for solving the problem.
• Analyze Methodically : Break down the problem into smaller components and analyze each part systematically.
• Apply Relevant Concepts : Identify the scientific principles relevant to the case study and apply them appropriately.
• Consider Multiple Perspectives : Explore different angles and viewpoints while proposing solutions, taking into account various scientific factors.
• Provide Justifications : Support your answers with scientific explanations and logical reasoning to strengthen your responses.

The Class 9 Science Case Study Questions provided in this article serve as a valuable resource for students seeking to enhance their scientific knowledge and problem-solving skills. By practicing these case studies, students can develop a deeper understanding of scientific concepts and their practical applications. Embrace this opportunity to engage with real-world scenarios and strengthen your scientific acumen.

Q1: Are the Class 9 Science Case Study Questions aligned with the official curriculum?

Yes, the Class 9 Science Case Study Questions presented in this article are aligned with the official curriculum. They cover relevant topics and concepts that students need to study for their exams.

Q2: Can practicing case study questions alone guarantee success in Class 9 Science exams?

Practicing case study questions is an important part of exam preparation, but it should be complemented with a thorough understanding of the subject matter. It is advisable to study the concepts in detail, refer to textbooks, and engage in other learning activities to achieve success in exams.

Q3: Where I Can get Class 9 Science Case Study Questions ?

You can practice Class 9 Science Case Study Questions on schools.studyrate.in for free.

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Case Study Questions of Class 9 Science PDF Download

Download PDF Case Study Questions of Class 9 Science to prepare for the upcoming CBSE Class 9 Exams Exam 2023-24. With the help of our well-trained and experienced faculty, we provide solved examples and detailed explanations for the recently added  Class 9 Science case study questions .

Case study questions are based on real or hypothetical scenarios that require students to analyze, evaluate, and apply scientific concepts to solve problems or make informed decisions. They often present a detailed context, providing students with the opportunity to demonstrate their understanding of the subject matter beyond basic recall.

Table of Contents

Class 9 Science: Case Study Questions

The inclusion of case study questions in Class 9 science CBSE is a great way to engage students in critical thinking and problem-solving. By working through real-world scenarios, Class 9 Science students will be better prepared to tackle challenges they may face in their future studies and careers. Class 9 Science Case study questions also promote higher-order thinking skills, such as analysis and synthesis. In addition, case study questions can help to foster creativity and innovation in students. As per the recent pattern of the Class 9 Science examination, a few questions based on case studies/passages will be included in the CBSE Class 9 Science Paper. There will be a paragraph presented, followed by questions based on it.

Chapterwise Case Study Questions of Class 9 Science

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

You can find a wide range of solved case studies on cbseexperts, covering various topics and concepts. Class 9 Science case studies are designed to help you understand the application of various concepts in real-life situations.

Class 9 Science Syllabus

Unit I: Matter-Nature and Behaviour

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

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

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

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

Unit II: Organization in the Living World

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

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

Unit III: Motio n, Force,  and Work

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

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

Gravitation:  Gravitation; Universal Law of Gravitation, Force of Gravitation of the earth (gravity), Acceleration due to Gravity; Mass and Weight; Free fall. Floatation: Thrust and Pressure. Archimedes’ Principle; Buoyancy.

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

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

Unit IV: Food Production

Plant and animal breeding and selection for quality improvement and management; Use of fertilizers and manures; Protection from pests and diseases; Organic farming.

Books for Class 9 Science Exams

Benefits of Case Study Questions

• Enhancing Analytical Skills : Case study questions challenge students to analyze complex scenarios, identify relevant information, and derive meaningful insights. By engaging with these questions, students develop critical analytical skills that are essential for scientific thinking and problem-solving.
• Promoting Critical Thinking : Case study questions encourage students to think critically and evaluate different perspectives. They require students to reason, make logical deductions, and justify their answers with supporting evidence. This process helps in honing their critical thinking abilities, enabling them to approach problems from multiple angles.
• Encouraging Practical Application of Concepts : By presenting real-world or hypothetical situations, case study questions promote the application of scientific concepts in practical scenarios. This application-based approach fosters a deeper understanding of the subject matter and helps students see the relevance of what they learn in the classroom to everyday life.

Case study questions of Class 9 Science provide students with an opportunity to apply their knowledge, enhance analytical skills, and think critically. By understanding the format, benefits, and effective strategies for answering case study questions, students can excel in this form of assessment. While challenges may arise, practicing time management, improving information extraction skills, and enhancing observation abilities will enable students to overcome these obstacles and perform well. Embracing case study questions as a valuable learning tool can contribute to a holistic understanding of scientific concepts and foster problem-solving abilities.

1. What is the purpose of case study questions in Class 9 Science?

Case study questions serve the purpose of evaluating a student’s understanding of scientific concepts, their ability to apply knowledge in real-life situations, and their analytical and critical thinking skills.

2. How can case study questions help improve analytical skills?

Case study questions require students to analyze complex scenarios, identify relevant information, and derive meaningful insights. Regular practice with such questions can significantly enhance analytical skills.

3. Are case study questions difficult to answer?

Case study questions can be challenging due to their comprehensive nature and the need for critical thinking. However, with practice and effective strategies, students can develop the skills necessary to answer them effectively.

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Case Study Questions for Class 9 Science Chapter 12 Sound

• Last modified on: 4 weeks ago
• Reading Time: 7 Minutes

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Here we are providing case study questions for class 9 science chapter 12 sound. Students are suggested to go through each and every case study questions for better understanding of the chapter.

Case Study/Passage Based Questions:

Question 1:

Read the following and answer any four questions from (i) to (iv) given below :

Sound bounces off a solid or a liquid like a rubber ball bounce off a wall. Like the light, sound gets reflected at the surface of a solid or liquid and follows the same laws of reflection.

The directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface at the point of incidence, and the three are in the same plane. If we clap near a suitable reflecting object such as a tall building or a mountain, we will hear the same sound again a little later. This sound that we hear is called an echo.

The sensation of sound persists in our brain for about 0.1 s. To hear a distinct echo the time interval between the original sound and the reflected one must be at least 0.1s. Hence, for hearing distinct echoes, the minimum distance of the obstacle from the source of sound must be 17.2 m. This distance will change with the temperature of air. Another phenomenon of reflection of sound is reverberation.

A sound created in a big hall will persist by repeated reflection from the walls until it is reduced to a value where it is no longer audible. The repeated reflection that results in this persistence of sound is called reverberation. Excessive reverberation is highly undesirable.

(i) Which of the following is true related to the reflection of sound? (a) Directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface at the point of incidence. (b) Incident wave reflected wave and normal lies in the same plane (c) Both a and b are true. (d) None of these

(ii) For hearing distinct echoes, the minimum distance of the obstacle from the source of sound must be (a) 10m (b) 20m (c) 17.2m (d) None of these

(iii) Excessive reverberation is  (a) Desirable phenomenon (b) Undesirable phenomenon (c) Does not exist (d) None of these

(iv) A person makes a sound near an obstacle and heard the echo after 1 s. What is the distance of the obstacle from the person if the speed of the sound, v is taken as 346 m/s?

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Class 9 Social Science Case Study Questions

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myCBSEguide App

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.

If you’re seeking Class 9 Social Science Case Study Questions, you’ve come to the correct spot. Students can use Class 9 Social Science Case Study Questions to help them answer a variety of questions about the Class 9 Social Science case study.

The CBSE Board has included case study questions in Class 9 Social Science examination pattern. As a result, it becomes an indispensable study tool.

The need for a student-friendly app to explain and facilitate the understanding of the social sciences subject has been felt for a long. Especially for students who do not have a strong foundation in Class 9 Social Science. With myCBSEguide , class 9 social science students now have a place where they can find resources that are student-friendly, interesting and easy to understand.

Class 9 Social Science Case Study questions are intended to assess student’s abilities to apply their learning to practical scenarios. You’ll need to employ your critical thinking and problem-solving skills to come up with the best solution. Class 9 Social Science case study questions are designed to test your knowledge and help you improve your skills.

Class 9 Social Science Case Study Questions Samples

myCBSEguide has identified the essential themes connected to CBSE case study questions for Class 9 Social Science that every student should be aware of following a comprehensive examination of CBSE Sample Papers and Marking Scheme. Students in Class 9 Social Science will benefit from this information in understanding the changes in the Class 9 Social Science. For a better understanding and analysis, students should refer to the example of Class 9 Social Science case study questions attached below:

Class 9 Social Science Case Study Question 1

Read the source given below and answer the questions that follow: On the morning of 14 July 1789, the city of Paris was in a state of alarm. The king had commanded troops to move into the city. Rumours spread that he would soon order the army to open fire upon the citizens. Some 7,000 men and women gathered in front of the town hall and decided to form a peoples’ militia. They broke into a number of government buildings in search of arms. Finally, a group of several hundred people marched towards the eastern part of the city and stormed the fortress-prison, the Bastille, where they hoped to find hoarded ammunition. In the armed fight that followed, the commander of the Bastille was killed and the prisoners released – though there were only seven of them. Yet the Bastille was hated by all because it stood for the despotic power of the king. The fortress was demolished and its stone fragments were sold in the markets to all those who wished to keep a souvenir of its destruction. The days that followed saw more rioting both in Paris and the countryside. Most people were protesting against the high price of bread. Much later, when historians looked back upon this time, they saw it as the beginning of a chain of events that ultimately led to the execution of the king in France, though most people at the time did not anticipate this outcome. Answer the following MCQs by choosing the most appropriate option:

On 14th July, 1789 the people of the ________ estate attacked the Bastille prison and freed all the prisoners signalling the start of the _________.

• first, civil war
• fourth, Russian war
• second, movement
• third, revolution

Which of the following statement is incorrect?

• The Bastille was the fortress-prison.
• The Bastille stood for the democratic power of the king.
• On the morning of 14 July 1789, the people of Paris stormed Bastille
• All are correct

In the question given below, there are two statements marked as Assertion (A) and Reason (R). Read the statements and chose the correct option: Assertion (A): The people of France storm the Bastille. Reason (R): They were hopeful to find King Louis XIV and commander of the Bastille there.

• Both A and R are correct and R is the correct explanation of A.
• Both A and R are correct but R is not the correct explanation of A.
• A is correct but R is wrong.
• Both A and R are wrong.

What was the immediate cause of rioting in Paris?

• Atrocities by the commander
• The high price of bread
• The killing of women and children
• All of these

Answer Key:

• (d) third, revolution
• (b) The Bastille stood for the democratic power of the king. [Explanation: The Bastille stood for the despotic power of the king.]
• (c) A is correct but R is wrong. [Explanation: The people of France stormed the fortress-prison, the Bastille because they were hopeful to find hoarded ammunition there.]
• (b) high price of bread

Class 9Social Science Case Study Question 2

Read the extracts and answer the question that follows:

The Himalayas, geologically young and structurally fold mountains stretch over the Himalayas northern borders of India. These mountain ranges run in a west-east direction from the Indus to the Brahmaputra. The Himalayas represent the loftiest and one of the most rugged mountain barriers of the world. They form an arc, which covers a distance of about 2,400 Km. Their width varies from 400 Km in Kashmir to 150 Km in Arunachal Pradesh. The altitudinal variations are greater in the eastern half than those in the western half. The Himalaya consists of three parallel ranges in its longitudinal extent. A number of valleys lie between these ranges. The northern most range is known as the Great or Inner Himalayas. It is the most continuous range consisting of the loftiest peaks with an average height of 6,000 metres. It contains all the prominent Himalayan peaks.

The folds of Great Himalayas are asymmetrical in nature. The core of this part of Himalayas is composed of granite. It is perennially snow bound, and a number of glaciers descend from this range.

• The Great or Inner Himalayas is also known as?
• Give two features of the folds of Great Himalayas.
• Give two features of the Inner Himalayas.
• The Great or Inner Himalayas is also known as the ‘Himadri’.
• (Any two relevant points)
• The folds of Great Himalayas are asymmetrical in nature.
• The core of this part of Himalayas is composed of granite.
• It is perennially snow bound, and a number of glaciers descend from this range.
• Features of the Inner Himalayas:
• It is the most continuous range consisting of the loftiest peaks with an average height of 6,000 metres.
• It contains all the prominent Himalayan peaks.  

Class 9 Social Science Case Study Question 3

Read the source given below and answer the questions that follow: In Pakistan, General Pervez Musharraf led a military coup in October 1999. He overthrew a democratically elected government and declared himself the ‘Chief Executive’ of the country. Later he changed his designation to President and in 2002 held a referendum in the country that granted him a five-year extension. Pakistani media, human rights organisations and democracy activists said that the referendum was based on malpractices and fraud. In August 2002 he issued a ‘Legal Framework Order’ that amended the Constitution of Pakistan. According to this Order, the President can dismiss the national and provincial assemblies. The work of the civilian cabinet is supervised by a National Security Council which is dominated by military officers. After passing this law, elections were held to the national and provincial assemblies. So Pakistan has had elections, elected representatives have some powers. But the final power rested with military officers and General Musharraf himself. Clearly, there are many reasons why Pakistan under General Musharraf should not be called a democracy. People may have elected their representatives to the national and provincial assemblies but those elected representatives were not really the rulers. They cannot take the final decisions. The power to take final decision rested with army officials and with General Musharraf, and none of them were elected by the people. This happens in many dictatorships and monarchies. They formally have an elected parliament and government but the real power is with those who are not elected. In a few countries, the real power was with some external powers and not with locally elected representatives. This cannot be called people’s rule. Answer the following MCQs by choosing the most appropriate option:

What is the meaning of Referendum?

• Direct vote in which the entire electorate is asked to either accept or reject a particular proposal
• A form of government in which the rulers are elected by the people
• A system where the majority or elected representatives are allowed to take decisions on behalf of all the people

In the question given below, there are two statements marked as Assertion (A) and Reason (R). Read the statements and chose the correct option: Assertion (A): Pakistan not considered a democratic country even after having elections Reason (R): Despite elections to the national and provincial assemblies, the final powers rested with General Musharraf and military officers.

• Both A and R are true and R is the correct explanation of A.
• Both A and R are true but R is not the correct explanation of A.
• A is wrong but R is correct.

After the passage of the ________, elections were held to the national and state assemblies.

• Military rule
• Legal Framework Order
• Both (b) and (c)

Does the given source explain the significance of which feature of democracy?

• Democracy must be based on a free and fair election
• In a democracy, the final decision-making power must rest with those elected by the people
• In a democracy, each adult citizen must have one vote
• Democratic government rules within limits set by constitutional law and citizens’ rights
• (a) Direct vote in which the entire electorate is asked to either accept or reject a particular proposal
• (a) Both A and R are true and R is the correct explanation of A.
• (c) Legal Framework Order
• (b) In a democracy, the final decision-making power must rest with those elected by the people

Steps to Master Class 9 Social Science Case Study Questions

Class 9 Social Science case study questions can be daunting, but there are some strategies you can use to ace them. There is no one-size-fits-all answer to Class 9 social science case study questions. The best way to solve a social science case study will vary depending on the specific case in question. However, there are some general tips that can be followed in order to improve your chances of success while answering class 9 social science case study questions.

• First, make sure to read the question carefully and understand what is being asked. It is often helpful to re-read the question after gathering all of your information.
• Next, organize your thoughts and create an outline of your answer. This will help you to stay on track and include all relevant information.
• Finally, write your answer in a clear and concise manner.

Class 9 Social Science Content Structure

Class 9 social science content is divided into four parts: History, Geography, Economics and Political Science. Each part is further divided into smaller themes/chapters.

Each of these topics given in Class 9 Social Science is important in its own right, and together they provide a comprehensive overview that affect our world today. The content is structured in such a way as to provide Class 9 Social Science students with a broad understanding of each issue, while also allowing them to focus on specific areas that are of particular interest to Class 9 Social Science students.

Class 9 Social Science COURSE CONTENT 

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Class 9th Science - Work and Energy 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 9th Science Subject - Work and Energy, CBSE. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.

QB365 - Question Bank Software

Work and energy case study questions with answer key.

9th Standard CBSE

Final Semester - June 2015

(ii) What is the value of total energy of the bob at position A ?

(iii) What is the value of kinetic energy of the bob at mean position 'O' ?

(iv) What is the value of kinetic energy and potential energy of the bob at the position 'P' whose height above 'O' is 2 cm ?

(v) What is kinetic energy? (a) Energy acquired due to motion (b) Energy acquired due to rest (c) Sum of Potential and mechanical energy (d) It is the energy stored inside a body.

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Work and energy case study questions with answer key answer keys.

(i) (a) 0.05 J The work done in raising the bob through a height of 5 cm (against the gravitational attraction) gets stored in the bob in the form of its potential energy. PE = mgh = 0.1 x 10 x 5 x 10-2 = 0.05 J (ii) (b) 0.05 J At position A, PE = 0.05 J, KE = 0 So, Total energy = 0.05 J (iii) (c) 0.05 J At mean position, potential energy is zero, hence KE at O = 0.05 J (iv) (d) P.E. = 0.02 J and K.E. = 0.03 J PE at P = mgh = 0.1 x 10 x 2 x 10-2 = 0.02 J K.E = Total energy – PE = 0.05 – 0.02 = 0.03 J (v) (a) Energy acquired due to motion

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Case Study Questions Class 9 Science Sound

Case study questions class 9 science chapter 12 sound.

CBSE Class 9 Case Study Questions Science Sound. Important Case Study Questions for Class 9 Exam. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Sound.

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

CBSE Case Study Questions Class 9 Science – Sound

(1) Sound is produced by vibrating objects. The matter or substance through which sound is transmitted is called a medium. It can be solid, liquid or gas. Sound moves through a medium from the point of generation to the listener. When an object vibrates, it sets the particles of the medium around it vibrating. The particles do not travel all the way from the vibrating object to the ear. Sound waves are characterized by the motion of particles in the medium and are called mechanical waves.When a vibrating objectmoves forward, it pushes and compresses theair in front of it creating a region of highpressure; this region is called a compression(C).When the vibrating object moves backwards,it creates a region of low pressure calledrarefaction (R). Hence sound is longitudinal wave.

(i) Sound waves are

(a) Mechanical waves

(b) Electromagnetic wave

(c) Transverse waves

(d) None of these

(ii) Sound travel in medium with

(a) Compression and rare fraction

(b) Crest and trough

(c) Both can be possible

(iii) Compression is the region of

(a) High pressure

(b) Low pressure

(c) Medium pressure

(iv) What is sound and how is it produced?

(v) Why sound wave is called as longitudinal wave?

Answer key 1

(iv) Sound is vibrations created by object. When body vibrates, it forces the adjacent particles of the medium to vibrate. This results in disturbance in the medium, which travels as waves an reaches the ear hence sound is produced.

(v) The vibration of medium that travels parallel to direction of wave or along in the direction of the wave is called longitudinal wave. The direction of particles of medium vibrates parallel to direction of propagation of disturbance. Therefore a sound is called longitudinal waves.

(2) The individual particlesof the medium move in a direction parallel tothe direction of propagation of thedisturbance. The particles do not move fromone place to another but they simply oscillateback and forth about their position of rest.This is exactly how a sound wave propagates;hence sound waves are longitudinal waves.There is also another type of wave, calleda transverse wave. In a transverse waveparticles do not oscillate along the direction of wave propagation but oscillate up and downabout their mean position as the wave travels.Thus, a transverse wave is the one in whichthe individual particles of the medium move about their mean positions in a directionperpendicular to the direction of wavepropagation.

(a) Transverse waves

(b) Longitudinal  wave

(c) Both a and b

(ii) Light is

(iii) In case of Longitudinal waves

(a) The particles do not move fromone place to another but they simply oscillateback and forth about their position of rest

(b) The particles move fromone place to another

(c) The particles move up and down.

(iv) When stone is dropped in water; waves are generated of which types?

(v) Differentiate between longitudinal wave and transverse waves.

Answer key-2

(iv) When stone is dropped in water. Waves are generated where water particles are moving up and down and propagated away from dropping point .hence this is sign of transverse waves. Hence transverse waves are produced when stone is dropped in water.

(v) Following are differentiated points

• The distance between two consecutivecompressions (C) or two consecutiverarefactions (R) is called the wavelength.The wavelength is usually represented by λ (Greek letter lambda). Its SI unit is meter (m). • If we can count the number of the compressions or rarefactions that cross us per unit time, we will get the frequency of the sound wave. It is usually represented by υ (Greek letter, nu). SI unit is hertz (symbol, Hz). • The time taken for one complete oscillation is called the time period of the sound wave. It is represented by the symbol T. Its SI unit is second (s).Frequency and time period are related asfollows: υ=1/λ • The speed of sound is defined as the distance which a point on a wave, such as a compression or a rarefaction, travels per unit time.

speed, v = distance / time

v= λ/T = υλ

(i ) SI unit of wavelength

(ii)SI unit of Frequency

(iii) Relation between frequency and time is given by

(a) frequency and time are directly proportional

(b) frequency and time are inversely  proportional

(c) There is no relation between them

(iv) Define speed of sound. Give its formula in terms of wavelength and frequency

(v) Define wavelength frequency and time period of longitudinal wave

answer key-3

(iv) The speed of sound is defined as the distance which a point on a wave, such as a compression or a rarefaction, travels per unit time.

v= λ/T = υλ.

(v) The distance between two consecutive compressions (C) or two consecutive rarefactions (R) is called the wavelength.The wavelength is usually represented by λ (Greek letter lambda). Its SI unit is meter (m).

If we can count the number of the compressions or rarefactions that cross us per unit time, we will get the frequency of the sound wave. It is usually represented by υ (Greek letter, nu). SI unit is hertz (symbol, Hz).

The time taken for one complete oscillation is called the time period of the sound wave. It is represented by the symbol T. Its SI unit is second (s).Frequency and time period are related as follows:  υ= 1/λ.

(4) A violin and a flute may both be played the same time in an orchestra. Bothsounds travel through the same medium,that is, air and arrive at our ear at the sametime. Both sounds travel at the same speedirrespective of the source. But the soundswe receive are different. This is due to thedifferent characteristics associated with thesound. Pitch is one of the characteristics.How the brain interprets the frequency ofan emitted sound is called its pitch. The fasterthe vibration of the source, the higher is the frequency and the higher is the pitch. The magnitude of the maximumdisturbance in the medium on either side ofthe mean value is called the amplitude of thewave. It is usually represented by the letter (A).

The loudness or softness of a sound isdetermined basically by its amplitude. Theamplitude of the sound wave depends uponthe force with which an object is made tovibrate. If we strike a table lightly, we hear asoft sound because we produce a sound waveof less energy (amplitude).

The quality or timber of sound is thatcharacteristic which enables us to distinguishone sound from another having the same pitchand loudness. The sound which is morepleasant is said to be of a rich quality. A sound of single frequency is called a tone. The sound which is produced due to a mixture of several frequencies is called a note and is pleasant to listen to. Noise is unpleasant to the ear! Music is pleasant to hear and is of rich quality.

(i) Pitch of sound is higher when

(a) Vibration of source of sound is higher

(b) Vibration of source of sound is Lower

(c) Independent of vibration of source of sound

(ii) Loudness and softness of sound depends upon

(a) Frequency of sound

(b) Amplitude of sound

(c) Wavelength of sound

(iii) Sound of single frequency is called

(iv)If we strike a table lightly, we hear asoft sound. If we hit the tablehard we hear a louder sound up to large distance. Why?

(v) Determine which of the following has higher pitch railway horn or guitar?

Answer key-4

(iv) If we hit the table hard we hear a louder sound because A sound wave spreads out from its source. As it moves away from the source its amplitude as well as its loudness decreases. Louder sound can travel a larger distance as it is associated with higher energy.

(v) Pitch of sound depends on the frequency of vibration of waves and if the frequency of vibration is higher we say that the sound has higher pitch. Pitch of the sound is the response of our ear. So, basically guitar has 6 strings and the sharpness of each string increases on going below. On the other hand in car horns, there is flat pitch with high noise which can affect anyone’s heart too. As guitar has higher frequency than car horn as number of vibrations per unit time of guitar string are more than car.

(5) Sound bounces off a solid or a liquid like a rubber ball bounces off a wall. Like light, sound

gets reflected at the surface of a solid or liquid and follows the same laws of reflection. The directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface at the point of incidence, and the three are in the same plane. If we clap near a suitable reflecting object such as a tall building or a mountain, we will hear the same sound again a little later. This sound which we hear is called an echo. The sensation of sound persists in our brain for about 0.1 s. To hear a distinct echo the time interval between the original sound and the reflected one must be at least 0.1s. Hence, for hearingdistinct echoes, the minimum distance of theobstacle from the source of sound must be 17.2 m. Thisdistance will change with the temperature ofair. Another phenomenon of reflection of sound is reverberation.A sound created in a big hall will persist byrepeated reflection from the walls until it isreduced to a value where it is no longeraudible. The repeated reflection that resultsin this persistence of sound is called reverberation. Excessive reverberation is highly undesirable.

(i) Which of the following is true related to reflection of sound?

(a) Directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface at the point of incidence.

(b) Incident wave reflected wave and normal lies in same plane

(c) Both a and b are true.

(ii)For hearing distinct echoes, the minimum distance of the obstacle from the source of sound must be

(iii) Excessive reverberation is 

(a) Desirable phenomenon

(b) Undesirable phenomenon

(c) Does not exist

(iv) A person makes sound near a obstacle and heard the echo after 1 s. What is the distance of the obstacle from the person if the speed of the sound, v is taken as 346 m/s?

(v) State law of reflection of sound.

Answer key-5

(iv) Given,

Speed of sound, v = 346 m/s

Time taken for hearing the echo, t = 1 s

Distance travelled by the sound= v × t = 346 m/s × 1 s = 346 m

In 1 s sound has to travel twice the distance between the obstacle and the person.

Hence, the distance between the obstacle and the person= 346/2 = 173 m.

(v) Law of reflection states that The directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface at the point of incidence, and the three  that is reflected wave, incident wave and normal to surface are in the same plane.

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