class 9 physics practical experiment 5

• CBSE Class 9

CBSE Class 9 Science Practicals

CBSE Practicals of Class 9 Science are equally important as the theory subject. By performing the practicals, students will learn by actual participation, which lasts in their memory for a longer time. Generally, most students forget the concepts that they have learnt in theory classes. But, when they perform the Science practicals, they remember it for a longer period. We easily forget the things that we listen to, but what we see remains firmly etched in our memory. Therefore, the CBSE Board has introduced practicals for Science subjects in Class 9. Here, we have provided all the details of Class 9 Science CBSE practicals for students.

Science practicals not only help students to understand the concepts but also generate interest among them. They get a platform to try out different things and showcase their creativity. In this way, their love for Science also gets enhanced. Moreover, students who find Science difficult also begin taking an interest in the subject.

CBSE Class 9 Science Practicals – Syllabus, Lab Manual and Kit

The CBSE Board has provided the official syllabus for Class 9 Science practicals. Also, the Board has allocated 30 periods for conducting all the practicals.  Here, we have provided a list of Science experiments that students need to perform in the laboratory. Further, we have also provided the information on the lab manual, important questions asked in practical exams and NCERT Science manual kit.

CBSE Class 9 Science Practicals Syllabus – List of Experiments

1) Preparation of:

a) A true solution of common salt, sugar and alum

b) A suspension of soil, chalk powder and fine sand in water

c) A colloidal solution of starch in water and egg albumin/milk in water and distinguish between these on the basis of

• transparency
• filtration criterion

2) Preparation of:

a) A mixture

b) A compound

using iron filings and sulphur powder and distinguishing between these on the basis of:

(i) Appearance, i.e., homogeneity and heterogeneity

(ii) Behaviour towards a magnet

(iii) Behaviour towards carbon disulphide as a solvent

(iv) Effect of heat

3) Perform the following reactions and classify them as physical or chemical changes:

a) Iron with copper sulphate solution in water

b) Burning of magnesium ribbon in air

c) Zinc with dilute sulphuric acid

d) Heating of copper sulphate crystals

e) Sodium sulphate with barium chloride in the form of their solutions in water

Also Check: CBSE Class 9 Chemistry Viva Questions

4) Preparation of stained temporary mounts of

(a) Onion peel

(b) Human cheek cells and to record observations and draw their labelled diagrams

5) Identification of Parenchyma, Collenchyma and Sclerenchyma tissues in plants, striped, smooth and cardiac muscle fibres and nerve cells in animals from prepared slides. Draw their labelled diagrams.

6) Determination of the melting point of ice and the boiling point of water.

7) Verification of the laws of reflection of sound.

8) Determination of the density of a solid (denser than water) by using a spring balance and a measuring cylinder.

9) Establishing the relation between the loss in weight of a solid when fully immersed in

a) Tap water

b) Strongly salty water with the weight of water displaced by it by taking at least two different solids

10) Determination of the speed of a pulse propagated through a stretched string/slinky (helical spring).

11) Verification of the law of conservation of mass in a chemical reaction.

CBSE Class 9 Science Laboratory Manuals

Students performing experiments by themselves will get a thrilling experience as they learn by participating. All the experiments are performed in the school Science laboratory. So, students must be aware of certain rules and regulations before performing experiments in the laboratory. For this purpose, the CBSE Class 9 Science lab manual has been provided by the Board. The laboratory manual familiarises students with the general facilities, chemical and glassware, measuring instruments, equipment, and specimen available in a school Science laboratory. The lab manual also mentions the precautions and safety measures mandatory for students to follow.

The description of the experiment in the CBSE Class 9 Science laboratory manual is provided in the following format:

• Aim of the experiment.
• Theory or the principle involved in the experiment.
• List of materials required to perform the experiment.
• Steps to be followed while performing the experiment.
• Recording the observations.
• The formula required for calculations and, finally, recording the result of the experiment.

Download CBSE Class 9 Science Lab Manuals

The Class 9 Science laboratory manual has 4 parts. Students can download them in the form of PDFs by clicking on the respective links below.

CBSE Class 9 Science Practical Important Questions

Here, we have listed a few questions from the CBSE Class 9 Science manuals. These questions are related to Physics, Chemistry and Biology topics of Science. However, students will get all these questions in the PDF files, which are provided above. Besides, at the end of each experiment, a few questions are provided in the lab manual.

Q1) A 100 g block slides when tension in the string is x N. What will be the tension in the string when an identical block is placed at the top of the first block?

Q2) State the factors on which the buoyant force acting on an object immersed in a fluid depends.

Q3) What will happen if a de-shelled egg is placed in a solution with the same osmotic concentration as in the egg?

Q4) What are the conditions that are helpful for the breeding of mosquitoes?

Q5) A metal cylinder is melted, and the whole mass is cast in the shape of a cube. What happens to its density? Give reasons.

Q6) What different techniques of separation can be employed for the separation of components of a homogeneous and heterogeneous mixture?

NCERT Class 9 Science Manual Kit

The NCERT Class 9 Science manual kit describes the kit items and their uses. It contains the activities of NCERT Class 9 Science textbook. Also, the experiments that are provided can be performed using this kit. The NCERT textbooks are designed in such a way that it covers various activities. In each chapter, topics are explained with the help of these activities. Just merely reading through the textbook will not help students to understand the concepts explained. It is required that students perform these activities. This can be done through the NCERT manual of the Class 9 Science kit. Performing these activities will enable students to think and explore. This will inculcate the questioning ability, exploring and discovering Science facts, which will create interest towards scientific discovery in students.

To download the NCERT Manual of Class 9 Science kit in PDF, click on the link below:

Download NCERT Class 9 Science Manual Kit

Each activity in the NCERT Class 9 Science manual kit is explained through the following points:

• The materials and instruments required to perform the activity.
• Steps to perform the activity.
• The outcome of the activity that students have learnt from it.

We hope students have found this article on “CBSE Class 9 Science Practicals” useful in their studies. Keep learning and stay tuned to BYJU’S for further updates on CBSE and other competitive exams. Download the BYJU’S – The Learning App and subscribe to the YouTube channel to access interactive Maths and Science videos.

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Physics Lab Manual Class 9 PDF Download

Free pdf download.

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Physics is an essential subject of Science in which students learn by doing better than the theory. The Class 9 Physics Lab Manual is prepared to keep in mind the same. It helps students enhance their overall learning by helping them implement theoretical knowledge in practice or the real world. Also, it helps to know the key points to remember when doing an experiment. 

The Physics Lab Manual Class 9 in PDF for free is available here for ease of access, students can access the CBSE Class 9 Physics Lab Manual anytime, anywhere they want. A link to access Chapter wise CBSE Class 9 Physics manual in PDF file format is given on this page.

What is Physics Lab Manual Class 9 in PDF?

The CBSE Lab Manual Class 9  for Physics in PDF is an unofficial booklet prepared and released by our subject matter experts to help students better prepare for the practicals and internal assessments.

For ease of access, the Class 9 Physics Lab Manual is prepared in a chapter-wise manner. Students studying in Class 9 should access the lab manual as it will help them better understand the lessons and enable them to prepare for the examination much easier and faster.

Chapter Wise NCERT Physics Lab Manual Class 9 PDF

Every chapter of NCERT Class 9 Physics is considered while developing the NCERT Physics Lab Manual Class 9 PDF. The PDF file of Class 9 Physics is filled with various theories and experiments.

Going through the Chapter-wise NCERT Physics Lab Manual Class 9 PDF help students boost their command of the topics mentioned in the syllabus.

In this section, we have shared links to NCERT Physics Lab Manual Class 9 PDF:

• Physics Lab Manual Class 9 for Sound
• Physics Lab Manual Class 9 for Density Of Solid
• Physics Lab Manual Class 9 for Archimedes’ Principle
• Physics Lab Manual Class 9 for Pressure
• Physics Lab Manual Class 9 for Velocity Of a Pulse In Slinky
• Physics Lab Manual Class 9 for Relationship Between Weight Of a Body & Force Required to Just Move It

What Includes in NCERT Physics Lab Manual Class 9 PDF?

A Statement followed by Aim, Apparatus/Material Required, Theory, Diagram (if applicable), Procedure, Observations, Calculations, Results/Outcome, Precautions, and Source of Error is the core elements mentioned in the NCERT Physics Lab Manual Class 9 PDF that we provide here. 

A brief intro to things mentioned in the Lab Manual of Class 9 Physics is mentioned here:

• Statement: The statement is like a question that needs to be answered by students, but in a systemic manner.
• Aim: The purpose of the statement or what the given statement wants from students is mentioned in the Aim section.
• Apparatus/Material Required: This section contains details of the Material required to complete the experiment mentioned in the form of the statement.
• Theory: Based on the topic, the experiments are given in the Lab Manual of CBSE Class 9; therefore, the theory is also explained in the Lab Manual.
• Diagram (if applicable): Not all but, in many experiments or practicals students are required to mention the charts.
• Procedure: A complete step-by-step process to successfully conducts the experiments are mentioned below.
• Observations: The observation section contains all the crucial data produced by the experiment or practical assessment.
• Calculations: Many experiments require separate Mathematical calculations which are also available in the Class 9 Physics Lab Manual.
• Results/Outcome: The result section requires the input of the total result of an experiment.
• Precautions: In order to do an error-free experiment, the precautions are mentioned in the CBSE Class 9 Physics Lab Manual PDF. The precautions ensure, students aren’t making any mistakes.
• Source of Error: In case of some error or wrong output in experiments, this section contains the possible source of errors.
• MCQ Questions and Answers: Based on the experiments, the CBSE Class 9 Lab Manual contains objective questions along with solutions. These MCQ Questions and answers can be useful when preparing for the viva questions.

Benefits of Class 9 Physics Lab Manual

There are several benefits of the Class 9 Physics Lab Manual that are discussed in this section.

• Helps Prepare Practical Notebook of CBSE Class 9 Physics to Submit for Internal Assessment: One of the benefits of the Class 9 Physics Lab Manual is that it helps students prepare the practical notebooks for CBSE Class 9 Physics which can be submitted for the internal assessment.
• A Better Preparation for Class 9 Physics Viva Questions: Various short and objective questions are available in the CBSE Class 9 Physics Lab Manual that are very helpful for the viva test as well as helps in answering the MCQ questions in the annual examination of CBSE Class 9.
• Helps Develop In-depth Understanding in Class 9 Physics: Due to hands-on experience with practical questions, students develop a better understanding of Class 9 Physics. It helps score better marks in the examination of CBSE Class 9 Physics.

Why Should You Use Physics Lab Manual Class 9?

Since Class 9 Lab Manual Physics is a study material, there are some reasons why students should use the Class 9 Physics Lab Manual.

• Hands-on Experience: Class 9 Physics lab manuals provide students with hands-on experience in conducting experiments and analyzing data. This hands-on experience helps students to better understand the concepts they are learning in Class 9 Physics.
• Strengthen Concepts: The lab manual of CBSE Class 9 Physics provides a practical way to strengthen the concepts learned in class. Students can apply the theories they learned in class to real-world situations and see how they work in practice.
• Develop Skills: With the help of the Physics Lab Manual Class 9 PDF, students develop important skills such as observation, data analysis, and critical thinking. These skills are essential in many fields, not just in physics, and will be useful throughout a student's academic and professional career.
• Preparation for Exams: Practicing experiments from the lab manual can help students prepare for their exams. By performing hands-on experiments, students can gain confidence in their abilities and improve their performance in exams.
• Due to Safety Reasons: There are safety guidelines and precautions in the Physics lab manual of NCERT Class 9 that students need to follow while conducting experiments. This ensures that students are aware of the risks involved and take necessary precautions to avoid any damage or accident.

When Is the Best Time to Use Physics Lab Manual Class 9 PDF?

Physics Lab Manual is not something to use on a regular basis but it becomes important when the annual examination date comes closer. In this section, we have shared the best time to use Physics Lab Manual Class 9 PDF.

• When Preparing for the CBSE Class 9 Physics Examination: At the time of Class 9 Physics exam preparation, students can use the NCERT Class 9 Physics Lab Manual which will help students better prepare for the MCQs as well as it will help them better develop practical knowledge of Physics.
• While Preparing the Practical Notebook for Internal Assessment: All the Class 9 students are required to submit the practical notebook before the examination for internal assessment purposes, this is the best time to use the Physics Lab Manual Class 9 in PDF for free of cost.

How to Download Physics Lab Manual Class 9 in PDF for Free?

For ease of access, here, we have a step-by-step guide:

• Visit Selfstudys.com
• Find & Click on the Navigation button

• Navigate to the CBSE and click to expand

• Then, Click on Lab Manual

• A new page opens, Choose Class 9 and you are ready to access the Physics Lab Manual Class in PDF for free.

What Are The Major Skills In Physics Practical Work for Class 9?

There are a few major skills Class 9 students who opted for Physics are expected to have in Physics practical work for Class 9.

• Manipulative Skills: One of the most important skills is Manipulative Skills which means, the ability to use hands or body to perform precise movements and control objects or tools.
• Observational Skills: Class 9 Students should have the observational skills to perform the practical work of Class 9 Physics. This skill helps students read about instruments and measure physical quantities, keeping the least count in mind.
• Drawing Skills: In order to depict the direction of force, tension, current, ray of light etc using suitable lines and arrows in Class 9 Physics, drawing skills are a must.
• Reporting Skills: To represent the observational data such as aim, apparatus, the formula used, principle, observation table, calculations and result for the experiment, from the Class 9 Physics experiments, the reporting skills are the most among all the major skills in Physics Practical Work for Class 9.
• Process-Oriented Performance Skills: One among many major skills is process-oriented performance skills in which students should have the ability to take the right decision while choosing the tools, instruments, materials, apparatus and chemicals and handle them appropriately.
• Product-Oriented Performance Skills: The skill to set up the apparatus according to the plan of the experiment, as well as the ability to verify the errors of the apparatus before attempting the Class 9 Physics practical exam, is known as Product-Oriented Performance skills.
• Mathematical Skills: To analyse, collect data, and prepare observations and calculations in Class 9 Physics Practicals, Mathematical Skills are important. 

Importance of Class 9 Physics Lab Manual for CBSE Class 9 Exam

The Class 9 Physics Lab Manual for CBSE Class 9, helps students in a variety of ways in the annual exam preparation. Here is the list of points of how the CBSE Class 9 Physics Lab Manual plays an important role in a Class 9 student’s life during exam preparation.

• Enhances Problem-Solving Skills: The Physics Lab Manual of Class 9 has a few questions that require students to identify problems, design experiments, and analyze data. This helps students develop problem-solving skills and critical thinking abilities. Due to this skill, students better perform in the final examination of CBSE Class 9.
• Improves Accuracy and Precision: Having better accuracy and precision helps students score better marks in the examination. Similarly, performing experiments in the lab requires students to be accurate and precise in their measurements and observations. This helps them improve their scientific skills and develop a better understanding of the importance of accuracy and precision in Class 9 Physics. Due to this skill learnt from the Class 9 Physics Lab Manual, students are able to score impressive marks in the examination.
• Helps In Exam Preparation: The lab manual includes a range of experiments that cover the CBSE Class 9 Physics syllabus. Students can use the Lab manual of Class 9 Physics to practice the experiments and become familiar with the types of questions that may be asked in the practical exam.

Common Mistakes to Avoid in Class 9 Physics Practical Exams?

Here are some common mistakes to avoid in Class 9 Physics 

Practical Exams that you should improve when practising using the NCERT Class 9 Physics Lab Manual PDF for free of cost. 

• Not reading the instructions carefully: Many Class 9 students lose marks by not reading the instructions carefully or skipping steps in the Physics experiment. It is important to read the instructions thoroughly before starting the experiment and to follow each step carefully to avoid any type of confusion and doubts.
• Not taking accurate measurements: The CBSE Class 9 Physics experiments require accurate measurements. Students should take care to use measuring instruments correctly and record their measurements accurately. It is also important to pay attention to units and significant figures. Because these are the most common mistakes Class 9 students often make in the Physics Practical exam.
• Not understanding the concepts: Physics practical work is not just about following procedures; it requires an understanding of the concepts covered. CBSE Class 9 Students should take care to understand the physics principles or theory involved in the experiment, as this will help them interpret their results and draw conclusions.
• Not being organized: A messy representation of Practical work also creates several confusions. Class 9 Physics practical exams often involve multiple experiments to be completed within a limited time. Class 9 Students should be organized and manage their time effectively to complete all Physics experiments within the given time frame.
• Not presenting the results clearly: In addition to performing the Physics experiment of Class 9, students need to present their results clearly and accurately. It is important to mention the graphs and tables correctly, include units and uncertainties, and provide a clear explanation of the Class 9 Physics Practical results.

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Density of Solid

• Science Experiment
• Density Of Solid

Physics Experiment - Density of Solid

Mass per unit volume is one method for describing a material's density. The lab can use a spring balance to determine the material's mass. The mass that was determined shall be referred to as weight per convention. If a solid has a regular geometric shape, its volume can be measured directly. Here, we will experiment to measure the density of a solid by measuring its mass and volume.

Table of Contents

Apparatus required

Precautions

The aim of this experiment is to determine the density of a solid, which will be denser than water. 

Apparatus Required

Spring balance, a beaker filled with water, a metal object, a measuring cylinder, string and a stand

The mass per unit volume of a substance is defined as the density of the substance. The formula for density is: 

\[Density = \dfrac{{Mass}}{{Volume}}\] . 

S.I. unit of density is \[Kg/{m^3}\] . The ratio of a density of a substance to the ratio of the density of reference (water, in our case) is defined as the Relative density of the substance. The difference between density and relative density is that the density is mass divided by volume (its unit is ${kg/m^3}$). In contrast, relative density is the density of a substance divided by the density of reference (it has no units).

The density of water is 1000 \[Kg/{m^3}\] . So, if the density of the solid is less than the water, then the solids will float on the water, and if the density of the solid is more than the water, i.e., the solid is denser, the solid will sink in water.

Spring balance is used to measure the weight of a substance, and weight can be defined as the force on an object due to the earth's gravity.

Force = mass x acceleration, 

As weight is a force, so weight = mass x acceleration due to gravity, 

Weight = m x g

Tie the metal object with a string and attach the string to the hook of the spring balance. Take the reading of spring balance before attaching a metal object. Write it down as ‘x’. Make sure it’s zero. This is called zero error.

Tie the spring balance to the stand or hold it in hand. Measure the weight of the object. Consider this weight as ‘W F ’.

Pour water into a given measuring cylinder. And note down its initial volume as ‘V 1 ’.

Now put the metal object in a measuring cylinder which contains water. Do not let the object touch the sides of the cylinder or base. The water level rises after putting metal objects in the cylinder. Now note down the increased volume in the measuring cylinder. Write this volume as ‘V 2 ’.

Take some more readings and perform the calculations to find the density of a given metal object. 

Density of Solid 

Observations

An initial reading of spring balance x = 0

Weight of the metal object = W = W F – x 

Mass of metal object = M = W F /9.8 

Initial volume in measuring cylinder at P = V 1

The final volume in the measuring cylinder at Q = V 2

Volume of Metal object V = V 2 - V 1  

Calculations 

${Density= {\dfrac{Mass (M)}{Volume(V)}}}$ = ……… (${kg/m^3}$)

Density of Metal is ……………. (${kg/m^3}$)

Make sure the spring balance reads zero initially.

Take all the readings of spring balance and measuring cylinder carefully such that your eyes are parallel to the reading.

Make sure that the metal object does not touch the sides of the cylinder.

Lab Manual Questions

1. Can you determine the density of any porous solid by using the spring balance and measuring cylinder setup?

Ans: We cannot find the density of porous solid using spring balance and measuring cylinder. Because the porous solid will absorb water, the mass of the solid will increase instead of decrease. This will affect the volume of water displaced.

2. How will the presence of air bubbles in the measuring cylinder affect the volume of the solid?

Ans: Air bubbles in liquid in the measuring cylinder will affect volume because air bubbles will occupy some space in the liquid, increasing the volume of the liquid.

3. What will happen to the density if we melt a metal cylinder and cast it in the shape of a cube? Give reason

Ans: Density will remain the same as the mass, and the volume of water displaced by the cylinder and cube will remain the same. So, the density will also remain the same.

4. At what temperature the density of water is maximum?

Ans: The density of water is maximum at 4 0 C.

Viva Questions

1. Define density.

Ans: Density is mass divided by volume.

2. State SI unit of density.

Ans: SI unit of density is Kg/m 3 .

3. Define density and give its SI unit

Ans: We can define density as mass upon volume, SI unit is Kg/m 3 .

4. What is C.G.S unit of density?

Ans: C.G.S. unit of density is g/cm 3 .

5. What is relative density?

Ans: Relative density is the density of a substance divided by the density of reference.

6. What is the value of acceleration due to gravity?

Ans: 9.8m/s 2

7. What is the difference in mass and weight?

Ans: Mass does not change with location but weight changes with a change in location.

8. What is the unit of relative density?

Ans: It is unitless.

9. What does spring balance measure?

Ans: Weight of body.

10. If we double the mass, what happens to density?

Ans: Density also doubles

Practice Based Questions

1. SI unit of Density is

Ans: c) kg/cm 3

2. Formula of density is

${Mass \times Volume}$

${Mass/Volume}$

${Mass \times Weight}$

${Mass/Weight}$

Ans: b) ${Mass/Volume}$

3. Which of the following has the highest density?

Ans: d) Iron

4. Relative density of water is

5. Two substances of relative densities d1 and d2 are mixed in the same volumes, then the relative density of the mixture becomes 4, and if mixed in the same masses, then the density of the mixture is 3. The values of d1 and d2 are _____ respectively

Ans: a) 6, 2

6. What happens when we put ice in water?

Ice floats partially and partially sinks

None of these

Ans: a) Ice floats

7. The body floats on water when its density is

More than water

Less than water

Equal to water

None of above

Ans: b) Less than water

8. If the mass of a body is halved

Density doubles

Density halves

Density remains same

Ans: b) Density halves

9. Density is

Directly proportional to mass

Directly proportional to volume

Inversely proportional to mass

Equal to Volume

Ans: a) Directly proportional to mass

10. Weight =

${m \times g}$

${m \times v}$

${v \times g}$

${v \times m}$

Ans: a) ${m \times g}$

In this experiment, we found the density value of a given solid using a spring balance and measuring cylinder. The density of a substance is mass divided by volume. When we put an object in water, the volume of water increases. This increase in volume is equal to the volume of the object.

FAQs on Density of Solid

1. Why do solids have higher density?

In solids, particles are very closely arranged. They have very few intermolecular spaces in between particles. In liquids, particles are not closely arranged. They have intermolecular spaces in between particles. Due to these low intermolecular spaces, solids have high density. In gases, the intermolecular spaces are even higher. Therefore, gases have even lesser density than solids. In the case of density, solids>liquids>gases. Solids are denser than liquids. Liquids are denser than gases.

2. What is the Volume of a solid?

The volume of solid measures the amount of space an object takes up. It can be measured by the number of unit cubes needed to fill the solid. The unit of volume is m 3 , mm 3 , cm 3 , etc. The volume of any three-dimensional object is the capacity of that object to hold the matter. Solids have definite volumes as they have definite shapes. The volume of the solid can be found by the method we used in the above experiment. The Volume of the solid will equal the amount of water displaced when we put that solid in water.

3. What is the difference between mass and weight?

Mass is a property of matter; it remains the same everywhere, while weight is the effect of gravity, it changes when acceleration due to gravity changes. Mass can never be zero, whereas weight can be zero where there is no gravity. Mass is a scalar quantity. It does not have direction; it has only magnitude, while weight is a vector quantity. It has magnitude and direction too. The unit of mass is g or kg. The unit of weight is N(Newton). Weight is a force, and mass is not a force.

4. When does the solid expand?

When we heat a solid, atoms vibrate faster around their fixed points. The relative increase in size is when heated is small. Metal railway tracks are kept small because the size increases when they heat due to the sun's heat. And the tracks fill small gaps and don’t buckle up on each other. This happens due to kinetic energy. This expansion decreases the density of the solid because the mass amount remains the same, but the volume it requires is increased.

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CBSE Class 9 Science Exam 2020: Important Practical Based Questions and Answers

Here you will get a set of important practical based questions for cbse class 9 science annual exam 2020. all the questions are thoroughly solved..

In CBSE Class 9 Annual Examination 2020, Science question papers may have a few question based on practical skills. Such questions are expected in set of 1 mark or 2 marks questions. So, to deal with the practical based questions, students must be aware of important practical concepts.

We are providing here important practical based questions for class 9 Science exam. All these questions are provided with detailed answers to make it easy for students to understand the concepts used. Practicing with these practical questions will help students to acquaint with important concepts and enhance their practical knowledge so that they are able to solve questions in exams to get correct answer.

Given below is a collection of important questions based on practical skills to prepare for CBSE class 9 Science exam:

1. Mention the two precautions to determine the boiling point of water in laboratory.

(i) The position of bulb should be slightly above the water level.

(ii) Stir the water continuously in beaker so that temperature should remain constant

2. The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?

Number of vibrations produced in 1s = 100

Number of vibrations produced in 60 sec = 100 × 60 = 6000

Now, 1 minute = 60 seconds

Thus, number of vibrations produced in one minute = 6000

CBSE Class 9 Science Notes: All Chapters

3. In which of the two, glycerine or kerosene, the loss in weight of a solid when fully immersed in them will be more and why ?

Density of glycerine is more than that of kerosene.

A liquid having higher density exerts more upthrust force on object than other liquid having low density. Thus, greater the density of a liquid, the more will be the the buoyant force exerted on the object immersed in it.  Now, due to this greater upthrust (buyont force), the object experiences greater apparent weight loss .

Thus in case of glycerine, the loss in weight of a solid when fully immersed in it will be more than when immersed in kerosene.

4. A sound wave travels at a speed of 340m/s. If its wavelength is 2 cm, what is the frequency of the wave? Will it be in the audible range?

It is given that,

Velocity of sound, v = 340 m/s

Wavelength, λ = 1.4 m

Frequency, ν =?

We know that, speed = wavelength × frequency

⟹          340 = 1.4 x ν ⟹              ν = 340/1.4 = 242.86 Hz As the audible range is between 20 Hz – 20,000 Hz Here, 242.86 Hz < 20,000 Hz Therefore it is in the audible range.

5. When dipped in a fluid, name the factor on which the loss in weight of a solid depends. Name the two forces which act upon the solid dipped in the fluid.

• True weight of the body acting vertically downwards.
• Buoyant force or upward thrust acting vertically upwards.

6. In an experiment to determine the boiling point of water, state reason for the following:

(i) Pumice stone pieces are added to water in the beaker.

(ii) A glass stirrer is used.

(i) Pumice stone is added to avoid any bumping of water. When the temperature is raised for boiling the water, it starts to bump. But pumice stone being porous, provides space for air. This reduces bubbling in hot water to facilitate the boiling process.

(ii) A glass stirrer is used to ensure uniform heating of water.

7. A mixture of sand, powdered glass and common salt is dissolved in water and then filtered. Name the substance left on filter paper. Name the substance in the filtrate.

Out of the given three substances only common salt is soluble in water whereas both sand and powdered glass are insoluble in water. Thus when a mixture of sand, powdered glass and common salt is dissolved in water and then filtered sand and powdered glass would be left on filter paper while common salt will be present in the filtrate. 

8. A free falling object eventually stops on reaching the ground. What happens to its kinetic energy?

Its kinetic energy will be zero on reaching the ground. Actually, when an object falls freely towards the ground, its potential energy decreases and kinetic energy increases. But as soon as the object touches the ground, all its potential energy gets converted into kinetic energy and finally when the ball stops after hitting the ground, all its kinetic energy gets converted into heat energy and sound energy. 

NCERT Solutions for Class 9 Science: All Chapters

9. Name the adaptation of fish which helps it in each of the following:

(i) Swimming in water

(ii) Breathing

(i) Fish have fins for swimming in water. (ii) They have gills for breathing in water.

10. A baby is not able to tell her/his caretakers that she/he is sick. What would help us to find out that the baby is sick?

Behavioural changes like constant crying, irritabilty, improper intake of food, low period of activeness and mood swings can help to determine that the baby is sick.

11. List any two precautions you must take while finding the melting point of ice and boiling point of water.

(i)  The bulb of the thermometer should be completely inside the crushed ice.

(ii) The thermometer should not touch the wall of the beaker.

12. When a body hanging with the hook of a spring balance is immersed in a liquid, state the factor due to which the reading of spring balance decreases. Define the factor.

The factor due to which the reading of spring balance immersed in a liquid decreases is buoyant force or upthrust.

Buoyant force (upthrust) is the upward force exerted by any fluid upon a body immersed in it.

13. A student recorded the mass of dry raisins as 2.0 g and mass of raisins after soaking as 3.5 g. Calculate the percentage of water absorbed by raisins. Write one precaution for this experiment.

Mass of dry raisins = 2.0 g

Mass of raisins after soaking = 3.5 g

Mass of water absorbed = 3.5 – 2.0 = 1.5 g

Precaution:   Raisins should be well immersed in water instead of lying not on surface.

14. Mention two features adopted by birds which help them to fly.

• Streamlined body shape which helps them to cut the air flow.
• Light bones reduce their overall body weight to help in easy flight.

15. Which of the following will show Tyndall effect?

(a) Salt solution

(c) Copper sulphate solution

(d) Starch solution

Milk and starch solution are colloids and hence will show Tyndall effect.

CBSE Class 9 Syllabus for Annual Exam 2020: All Subjects

16. When the wire of a guitar is plucked, what types of wave are produced in (i) air and (ii) wire? Give reasons in support of your answer.

(i) When the wire of a guitar is plucked, a longitudinal wave is produced in air due to the to and fro motion of string of guitar. (ii) In the wire of guitar, transverse wave is produced as the particle vibrates perpendicular to the direction of motion.

17. Explain how both physical and chemical changes take place during the burning of a candle.

Wax of the candle undergoes the combustion process to produce light and heat along with the liberation of carbon dioxide gas and water vapour. This is a chemical change. As a result, the candle melts and its shape is deformed. This is a physical change. So, during the burning of a candle, both physical and chemical changes take place.

18. The given figure represents a tissue found in the human body.

(a) Identify the tissue and state its function.

(b) Mention any two locations where this tissue is found in the body.

(a) The figure shows simple columnar epithelial tissue. Its main functions include absorption and secretion.

(b) Simple  columnar  epithelial  tissue  forms  the  lining  of  the  stomach,  small intestine, colon, gall bladder and oviducts.

19. There are two nails; one sharp and other blunt with the point surface areas being 0.1 m 2 and 1.5 m 2 , respectively. These nails are to be hammered into a wooden plank. Which nail will be hammered more easily if the force applied on hammer is 200 N for both nails? Also calculate the pressure required to hammer each nail.

Let nail A be sharper than another nail B. Thus, the surface area covered by the nail A is lesser than that of nail B. Therefore, more pressure will be produced on nail A leading it to move inside the wooden plank more easily than nail B.

Finding pressure required to hammer each nail

Now, Area of nail A = 0.1 m 2

Area of nail B = 1.5 m

Force applied on both nails= 200 N

20. While verifying the laws of reflection of sound, a student measured the angle between the incident sound wave and reflected sound wave as 100°. What will be the angle of reflection?

Given that the angle between incident sound wave and reflected sound wave = 100°

⇒ angle of incidence (i) + angle of reflection (r) = 100 o          …(i)

But, according to the law of reflection of sound, the angle of the incident sound wave is equal to the angle of the reflected sound wave.

⇒              ∠i = ∠r

Thus, equation (i) becomes:

          ∠i + ∠i = 100 o

⇒            2∠i = 100 o

⇒              ∠i = 50 o

Thus, angle of reflection, r = ∠i = 50 o

Also check:

CBSE Class 9 Science Exam 2019: Important Long Answer Type Questions

CBSE Class 9 Science Exam 2019: Important Very Short Answer Type Questions

CBSE Class 9 Science: Chapterwise important topics and questions

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