The phase difference between two points separated by 1m in a wave of frequency 120 Hz is 90°. The wave velocity is :

1. 180 m/s

2. 240 m/s

3. 480 m/s

4. 720 m/s

Subtopic:  Wave Motion |
 76%
From NCERT
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The echo of a gunshot is heard 8 sec. after the gun is fired. How far from him is the surface that reflects the sound? (velocity of sound in air = 350 m/s) :

1. 1400 m

2. 2800 m

3. 700 m

4. 350 m

Subtopic:  Speed of Sound |
 66%
From NCERT
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A man sets his watch by the sound of a siren placed at a distance 1 km away. If the velocity of sound is 330 m/s

1. His watch is set 3 sec. faster

2. His watch is set 3 sec. slower

3. His watch is set correctly

4. None of the above

Subtopic:  Speed of Sound |
 70%
From NCERT
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The velocity of sound in air is:

1. faster in dry air than in moist air.
2. directly proportional to the pressure.
3. directly proportional to temperature.
4. independent of the pressure of air.

Subtopic:  Speed of Sound |
 54%
From NCERT
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The frequency of a sound wave is n and its velocity is v. If the frequency is increased to 4n, the velocity of the wave will be 

(1) v

(2) 2v

(3) 4v

(4) v/4

Subtopic:  Speed of Sound |
From NCERT
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The speed of a wave in a certain medium is 960 m/s. If 3600 waves pass over a certain point of the medium in 1 minute, the wavelength is :

(1) 2 metres

(2) 4 metres

(3) 8 metres

(4) 16 metres

Subtopic:  Speed of Sound |
 84%
From NCERT
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The speed of sound at a constant temperature depends on:
1. Pressure 2. Density of gas
3. Above both 4. None of the above
Subtopic:  Speed of Sound |
 55%
From NCERT
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Sound velocity is maximum in :

(1) H2

(2) N2

(3) He

(4) O2

Subtopic:  Speed of Sound |
 77%
From NCERT
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The minimum distance of reflector surface from the source for listening the echo of sound is :

(1) 28 m

(2) 18 m

(3) 19 m

(4) 16.5 m

Subtopic:  Pressure Wave in Sound |
 62%
From NCERT
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The type of waves that can be propagated through solid is :

(1) Transverse

(2) Longitudinal

(3) Both (1) and (2)

(4) None of these

Subtopic:  Types of Waves |
 74%
From NCERT
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