# Physics-Sound (NSTSE (National Science Talent Search Exam- Unified Council) Class 9): Questions 1 - 6 of 55

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## Question number: 1

» Physics » Sound

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MCQ▾

### Question

A man starts walking away from the sound source, and he observes the frequency of sound, which he heard is different than frequency of sound source. It occurs because of:

### Choices

Choice (4) Response

a.

Resonance

b.

Interference of sound

c.

Reflection of sound

d.

Doppler’s effect

## Question number: 2

» Physics » Sound

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MCQ▾

### Question

The density of air is maximum at an instant, through which a sound wave is passing. The pressure at that point at same instant is:

### Choices

Choice (4) Response

a.

Equal to atmospheric pressure

b.

Minimum

c.

Maximum

d.

Same as the density

## Question number: 3

» Physics » Sound

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MCQ▾

### Question

If speed of sound in air is and an echo is heard in after the emission of sound, then the distance of the reflecting surface from the source is:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 4

» Physics » Sound

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MCQ▾

### Question

An object produces a sound wave of frequency of and wavelength . The time required to cover the distance of is?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 5

» Physics » Sound

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MCQ▾

### Question

Which of the following is/are quantity/quantities of sound waves?

### Choices

Choice (4) Response

a.

Wavelength

b.

Amplitude

c.

Frequency

d.

All a. , b. and c. are correct

## Question number: 6

» Physics » Sound

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MCQ▾

### Question

The sound waves are:

### Choices

Choice (4) Response

a.

Transverse waves

b.

Electromagnetic waves

c.

Longitudinal waves

d.

All of the above

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