Sound Class 8 MCQ Questions and Answers

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Sound Class 8 MCQ Questions and Answers. We covered all the Sound Class 8 MCQ Questions and Answers in this post for free so that you can prepare for the competitive exams.

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MCQ on Sound for School Students

The vibrations produced in a body when it is set into vibration and then left to itself, are

1. forced vibrations

2. natural vibrations

3. free vibrations

4. (2) and (3)

Option 4 – (2) and (3)

Periodic vibrations of decreasing amplitude are called

1. forced vibrations

2. natural vibrations

3. damped vibrations

4. resonance

Option 3 – damped vibrations

The continuous decrease in the amplitude of a vibrating body is due to

1. the resistance offered by the air around it

2. the nature of a vibrating body

3. the gravitational force of attraction

4. None

Option 1 – the resistance offered by the air around it

When the stem of a vibrating tuning fork is pressed against the top of a table, the sound becomes louder because

1. the table top has a much larger vibrating area 3 than the tuning fork

2. the table top has a much smaller vibrating area than the tuning fork

3. the vibrating area of table top is same as that of tuning fork

4. None of these

Option 1 – the table top has a much larger vibrating area 3 than the tuning fork

The vibrations produced in a table top when the stem of a vibrating tuning fork is pressed against the table top, are

1. Natural vibrations

2. Forced vibrations

3. Free vibrations

4. None of these

Option 2 – Forced vibrations

The frequency of vibration attained by a table top when the stem of a vibrating tuning fork is pressed against it is equal to the

1. Natural frequency of the table top

2. Natural frequency of the tuning fork

3. Sum of the natural frequencies of table top and tuning fork

4. None

Option 2 – Natural frequency of the tuning fork

The vibrations produced in a body under the influence (action) of an external periodic force are called

1. Natural vibrations

2. Forced vibrations

3. Free vibrations

4. Resonance

Option 2 – Forced vibrations

The frequency of vibrations produced in a body under the influence of an external body is

1. equal to the natural frequency of the body

2. equal to twice the frequency of the external periodic force

3. equal to the frequency of the external periodic force

4. None of above

Option 3 – equal to the frequency of the external periodic force

If a body under the influence of an external periodic force vibrates with its natural frequency, then

1. the natural frequency of the body is equal to the natural frequency of the external periodic force

2. the natural frequency of the body is not equal to the frequency of the external periodic force

3. both of these

4. None of these

Option 1 – the natural frequency of the body is equal to the natural frequency of the external periodic force

If one of the two bodies vibrates with larger amplitude under the influence of the first body, then their frequencies are

1. equal

2. not equal

3. equal after some time

4. none of these

Option 1 – equal

The value of the frequency of oscillation of a simple pendulum depends upon

1. its length

2. amplitude

3. the size of its bob

4. the shape of its bob

Option 1 – its length

The frequency of vibration of a given tuning fork

1. does not change even if it is striked hardly on gently

2. increases when it is striked hardly

3. decreases when it is striked hardly

4. decreases when it is striked gently

Option 1 – does not change even if it is striked hardly on gently

The value of the frequency of oscillation of a simple pendulum

1. changes with the increase in the amplitude of oscillation

2. does not change even if its amplitude is slightly increased

3. does not change even if its amplitude is slightly decreased

4. (2) and (3)

Option 4 – (2) and (3)

The value of frequency of vibration of a tuning fork

1. does not change even if it is striked harder

2. does not change even if it is striked gently

3. changes when its dimensions are changed

4. All of the above

Option 3 – changes when its dimensions are changed

We covered all the sound class 8 MCQ questions and answers in this post for free so that you can practice well for the exam.

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