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.

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

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

Sound velocity is maximum in :

(1) H₂

(2) N₂

(3) He

(4) O₂

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

The type of waves that can be propagated through solid is :

(1) Transverse

(2) Longitudinal

(3) Both (1) and (2)

(4) None of these

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.

(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

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) $\sqrt{\frac{d_2}{d_1}}$

(2) $\sqrt{\frac{d_1}{d_2}}$

(3) d₁d₂

(4) $\sqrt{d_1{d}_2}$

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