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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.

[0.04] Structure of the Atom
Chapter: [0.04] Structure of the Atom
Concept: Structure of Atom

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?

[0.04] Structure of the Atom
Chapter: [0.04] Structure of the Atom
Concept: Structure of Atom

What is a tissue?

[0.06] Tissues
Chapter: [0.06] Tissues
Concept: Concept of Tissues

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

[0.06] Tissues
Chapter: [0.06] Tissues
Concept: Concept of Tissues

State any two conditions essential for good health.

[0.13] Why Do We Fall ill
Chapter: [0.13] Why Do We Fall ill
Concept: Disease and Its Causes > Health and Its Failure

State any two conditions essential for being free of disease.

[0.13] Why Do We Fall ill
Chapter: [0.13] Why Do We Fall ill
Concept: Disease and Its Causes > 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?

[0.13] Why Do We Fall ill
Chapter: [0.13] Why Do We Fall ill
Concept: Disease and Its Causes > 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.

[0.09] Force and Laws of Motion
Chapter: [0.09] 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?

[0.12] Sound
Chapter: [0.12] Sound
Concept: Production of Sound

Explain how sound is produced by your school bell.

[0.12] Sound
Chapter: [0.12] Sound
Concept: Production of Sound

What is sound and how is it produced?

[0.12] Sound
Chapter: [0.12] Sound
Concept: Production of Sound

Give two examples of bodies having non-uniform motion.

[0.08] Motion
Chapter: [0.08] Motion
Concept: Motion (Introduction)

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

[0.09] Force and Laws of Motion
Chapter: [0.09] Force and Laws of Motion
Concept: Balanced and Unbalanced Forces

Name the unbalanced force which slows down a moving bicycle when we stop pedalling it.

[0.09] Force and Laws of Motion
Chapter: [0.09] Force and Laws of Motion
Concept: Balanced and Unbalanced Forces

State whether the following statement is true or false :
Unbalanced forces acting on a body change its shape.

[0.09] Force and Laws of Motion
Chapter: [0.09] Force and Laws of Motion
Concept: Balanced and Unbalanced Forces

State whether force is a scalar or a vector quantity?

[0.09] Force and Laws of Motion
Chapter: [0.09] Force and Laws of Motion
Concept: Balanced and Unbalanced Forces

Fill in the following blank with suitable word:

When a running car stops suddenly, the passengers are jerked …………………..

[0.09] Force and Laws of Motion
Chapter: [0.09] Force and Laws of Motion
Concept: Balanced and Unbalanced Forces

Fill in the following blank with suitable word :

When a stationary car starts suddenly, the passengers are jerked …………………..

[0.09] Force and Laws of Motion
Chapter: [0.09] Force and Laws of Motion
Concept: Balanced and Unbalanced Forces

Fill in the following blanks with suitable word :

If there were no unbalanced force of……………….. and no…………………. resistance, a moving bicycle would go on moving for ever.

[0.09] Force and Laws of Motion
Chapter: [0.09] Force and Laws of Motion
Concept: Balanced and Unbalanced Forces

Which of the two, balanced forces or unbalanced forces, can change the shape of an object ? Give an example to illustrate your answer.

[0.09] Force and Laws of Motion
Chapter: [0.09] Force and Laws of Motion
Concept: Balanced and Unbalanced Forces
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