If vm is the velocity of sound in moist air, vd is the velocity of sound in dry air, under identical conditions of pressure and temperature 

(1) vm > vd

(2) vm < vd

(3) vm = vd

(4) vmvd = 1

Subtopic:  Speed of Sound |
 74%
From NCERT
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A source of the sound of frequency 600 Hz is placed inside water. The speed of sound in water is 1500 m/s and in the air is 300 m/s. The frequency of sound recorded by an observer who is standing in the air is : 

1. 200 Hz

2. 3000 Hz

3. 120 Hz

4. 600 Hz

Subtopic:  Wave Motion |
 69%
From NCERT
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An underwater sonar source operating at a frequency of 60 kHz directs its beam towards the surface. If the velocity of sound in air is 330 m/s, the wavelength and frequency of waves in air are: 

(1) 5.5 mm, 60 kHz

(2) 330 m, 60 kHz

(3) 5.5 mm, 20 kHz

(4) 5.5 mm, 80 kHz

Subtopic:  Wave Motion |
 88%
From NCERT
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It is possible to distinguish between the transverse and longitudinal waves by studying the property of :

1. Interference

2. Diffraction

3. Reflection

4. Polarisation

Subtopic:  Types of Waves |
 58%
From NCERT
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Water waves are 

(1) Longitudinal

(2) Transverse

(3) Both longitudinal and transverse

(4) Neither longitudinal nor transverse

Subtopic:  Types of Waves |
 70%
From NCERT
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The waves in which the particles of the medium vibrate in a direction perpendicular to the direction of wave motion is known as 

1. Transverse wave

2. Longitudinal waves

3. Propagated waves

4. None of these

Subtopic:  Types of Waves |
 81%
From NCERT
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What is the phase difference between two successive crests in the wave?

(1) π

(2) π/2

(3) 2π

(4) 4π

Subtopic:  Wave Motion |
 52%
From NCERT
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A wave of the frequency of 500 Hz has a velocity of 360 m/sec. The distance between two nearest points 60° out of phase is :

(1) 0.6 cm

(2) 12 cm

(3) 60 cm

(4) 120 cm

Subtopic:  Types of Waves |
 77%
From NCERT
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Sound waves of wavelength greater than that of audible sound are called :

(1) Seismic waves

(2) Sonic waves

(3) Ultrasonic waves

(4) Infrasonic waves

Subtopic:  Types of Waves |
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The ratio of masses of nitrogen and oxygen is 14:16. The temperature at which the speed of sound in nitrogen will be same at that in oxygen at 55°C is -

1. 35°C

2. 48°C

3. 65°C

4. 14°C

Subtopic:  Speed of Sound |
 70%
From NCERT
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