Physics
X-rays region lies between

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

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Above a certain minimum value depending on amount of water in the pail
Below a certain minimum value depending on amount of water in the pail
Above a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail

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Physics
The term ''equinox' means

The axis of the Earth around which it rotates
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon
When the day and night are of equal duration
The path which the Earthtakes around the Sun

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