Velocity of sound in air

I. Increases with temperature

II. Decreases with temperature

III. Increase with pressure

IV. Is independent of pressure

V. Is independent of temperature

Choose the correct answer. [Kerala (Engg.) 2001]

(1) Only I and II are true

(2) Only I and III are true

(3) Only II and III are true

(4) Only I and IV are true

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If at same temperature and pressure, the densities for two diatomic gases are respectively d1 and d2, then the ratio of velocities of sound in these gases will be :

(1) d2d1

(2) d1d2

(3) d1d2

(4) d1d2

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The velocity of sound measured in hydrogen and oxygen gas at a given temperature will be in the ratio :

(1) 1 : 4

(2) 4 : 1

(3) 2 : 1

(4) 1 : 1

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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

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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

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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

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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

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Types of waves
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Water waves are 

(1) Longitudinal

(2) Transverse

(3) Both longitudinal and transverse

(4) Neither longitudinal nor transverse

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Types of waves
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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

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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

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