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

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## Question 1

Sound
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### Question

MCQ▾

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 2

Sound
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### Question

MCQ▾

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 3

Sound
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### Question

MCQ▾

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 4

Sound
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### Question

MCQ▾

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 5

Sound
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### Question

MCQ▾

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 6

Sound
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### Question

MCQ▾

The sound waves are:

### Choices

Choice (4)Response
a.Transverse waves
b.Electromagnetic waves
c.Longitudinal waves
d.All of the above