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# Question Bank Solutions for CBSE Class 9 - CBSE - Science

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If bromine atom is available in the form of, say, two isotopes ""_35^79Br (49.7%)" and """_35^81Br (50.3%), calculate the average atomic mass of bromine atom.

[4] Structure of the Atom
Chapter: [4] Structure of the Atom
Concept: Structure of Atom Introduction

The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes ""_8^16X" and """_8^18X  in the sample?

[4] Structure of the Atom
Chapter: [4] Structure of the Atom
Concept: Structure of Atom Introduction

Who discovered cells and how?

[5] The Fundamental Unit of Life
Chapter: [5] The Fundamental Unit of Life
Concept: Concept of Living Organisms

Why is the cell called the structural and functional unit of life?

[5] The Fundamental Unit of Life
Chapter: [5] The Fundamental Unit of Life
Concept: Concept of Living Organisms

How does an Amoeba obtain its food?

[5] The Fundamental Unit of Life
Chapter: [5] The Fundamental Unit of Life
Concept: Concept of Living Organisms

What is a tissue?

[6] Tissues
Chapter: [6] Tissues
Concept: Concept of Tissues

What is the utility of tissues in multi-cellular organisms?

[6] Tissues
Chapter: [6] Tissues
Concept: Concept of Tissues

State any two conditions essential for good health.

[13] Why Do We Fall Ill
Chapter: [13] Why Do We Fall Ill
Concept: Health and Its Failure

State any two conditions essential for being free of disease.

[13] Why Do We Fall Ill
Chapter: [13] Why Do We Fall Ill
Concept: Health and Its Failure

State any two conditions essential for good health and two conditions essential for being free of disease?

Are the answers to the above questions necessarily the same or different? Why?

[13] Why Do We Fall Ill
Chapter: [13] Why Do We Fall Ill
Concept: Health and Its Failure

An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide a reason.

[9] Force and Laws of Motion
Chapter: [9] Force and Laws of Motion
Concept: Balanced and Unbalanced Forces

How does the sound produced by a vibrating object in a medium reach your ear?

[12] Sound
Chapter: [12] Sound
Concept: Production of Sound

Explain how sound is produced by your school bell.

[12] Sound
Chapter: [12] Sound
Concept: Production of Sound

What is sound and how is it produced?

[12] Sound
Chapter: [12] Sound
Concept: Production of Sound

What do we get from cereals, pulses, fruits and vegetables?

[15] Improvement in Food Resources
Chapter: [15] Improvement in Food Resources
Concept: Improvement in Crop Yields - Crop Variety Improvement

How do biotic and abiotic factors affect crop production?

[15] Improvement in Food Resources
Chapter: [15] Improvement in Food Resources
Concept: Improvement in Crop Yields - Crop Variety Improvement

What are the desirable agronomic characteristics for crop improvements?

[15] Improvement in Food Resources
Chapter: [15] Improvement in Food Resources
Concept: Improvement in Crop Yields - Crop Variety Improvement

What is genetic manipulation? How is it useful in agricultural practices?

[15] Improvement in Food Resources
Chapter: [15] Improvement in Food Resources
Concept: Improvement in Crop Yields - Crop Variety Improvement

Give two examples of bodies having non-uniform motion.

[8] Motion
Chapter: [8] Motion
Concept: Motion (Introduction)

What is the usual name of the forces which cannot produce motion in a body but only change its shape ?

[9] Force and Laws of Motion
Chapter: [9] Force and Laws of Motion
Concept: Balanced and Unbalanced Forces
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