Physics
Velocity of sound in air does not depend on

Density of air
Pressure of air
Temperature of air
Humidity of air

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Physics
The Hooke's law is valid for

Entire elastic region of the stress strain curve
Entire stress strain curve
Only proportional region of the stress strain curve
Elastic as well as plastic region of the stress strain curve

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Physics
It is easier to roll a stone up a sloping road than to lift it vertical upwards because

Work done in rolling a stone is less than in lifting it.
Work done in both is same but the rate of doing work is less in rolling.
Work done in lifting the stone is equal to rolling it.
Work done in rolling is more than in lifting.

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