Physics
Which one among the following doesn't have any effect on velocity of sound ?

Temperature
Humidity
Pressure
Density

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Physics
Superconductors are substances which

conduct electricity at high temperatures
offer no resistance to the flow of electricity
offer high resistance to the flow of current
conduct electricity at low temperature

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Physics
Rain drops fall from great height. Which among the following statements is true regarding it?

They fall with same ultimate velocity
They fall with that ultimate velocity, which are different for different droplets
Their velocity increases and they fall with same velocity on the earth
Their velocity increases and they fall with different velocity on the earth

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Physics
A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

The stone conveys the heat away from the feet more rapidly than the carpet
The human body maintains a constant temperature
The carpet is a better conductor of heat than the stone
The floor and carpet are at different temperatures

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