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

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

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Physics
X-rays region lies between

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

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