Physics
X-rays region lies between

Visible and infra-red region
Short radio waves and long radio waves
Ultraviolet and visible region
Gamma-rays and ultraviolet region

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

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

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