Physics
The tidal waves on sea is mainly due to

Gravitational Effect of Sun on Earth
None of these
Gravitational Effect of Earth on Moon
Gravitational Effect of Moon on 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 carpet is a better conductor of heat than the stone
The floor and carpet are at different temperatures
The stone conveys the heat away from the feet more rapidly than the carpet
The human body maintains a constant temperature

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