Physics
Supersonic plane fly with the speed

less than the speed of sound
of light
greater than the speed of sound
of sound

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

density of mercury is greater than that of water.
cohesion of mercury is greater than its adhesion with glass.
mercury is a metal.
cohesion of water is greater than its adhesion with glass.

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

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

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