Physics
Angle of friction and angle of repose are

Proportional to each other
None of these
Not equal to each other
Equal to each other

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

His weight may be reduced
No frictional force may be produced between the wheels and the axle
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.

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Physics
The wall of a dam is broader at the base

To withstand pressure that increases in a horizontal plane
To withstand pressure that increases with depth
To withstand pressure that is increased with atmospheric pressure
Because streamlining is required

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Physics
The earth is a

Non-absorber of heat
Bad absorber and bad radiator of heat
Good absorber and good radiator of heat
Good reflector of heat

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