Effect of Wind on Speed of Sound

Q. At the room temperature the velocity of sound in $O_2$ gas is V. Then in mixture of $H_2$ and $O_2$ gas the speed of sound at same temperature :

1. will be less than V.
2. will be more than V
3. will be equal to V
4. will becomes zero

Q.

The sound of an explosion on the surface of a lake is heard by a boatman $100m$ away and a driver $100m$ below the point of explosion. Of the two persons mentioned (boatman or driver) who would hear the sound first? And why?

Q. Speed of sound in air is

1. $343m/s$
2. $1234.8km/hr$
3. None
4. Both $A$ and $B$

Q. The increase in the speed of sound, on increasing the temperature of the medium by ${10}^{\circ }C$, will be

1. $0.61m{s}^{-1}$
2. $60m{s}^{-1}$
3. $6m{s}^{-1}$
4. $600m{s}^{-1}$

Q. Two sound waves, P and Q, of speeds $350\text{m/s}$ and $410\text{m/s}$, are travelling from A to B and B to A respectively at the same time. If the wind speed is $35\text{m/s}$ in the direction of A to B, which sound will reach an observation at either of the destinations first?

1. It depends on their frequency.
2. Both reach at the same time.
3. Q will reach first.
4. P will reach first.

Q. The direction of the wind affects the velocity of sound. True or False?

Q. If a source of sound and a man are at the same altitude, the sound is heard better in the direction of the wind than in the opposite direction. How can you explain this phenomenon?