Physics
Water cannot be used to extinguish fire caused by electric current, because

It may cause electrolysis
It may spoil the wiring
It may cause electrocution
It may cause hydrolysis

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Physics
X-rays region lies between

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

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Physics
A cyclist leans inwards when he is negotiating a curve so that

No frictional force may be produced between the wheels and the axle
His weight may be reduced
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
He may increase his speed

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