Physics
A white and smooth surface is

Bad absorber and bad reflector of heat
Good absorber and bad reflector of heat
Good absorber and good reflector of heat
Bad absorber and good reflector of heat

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Physics
A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

None of these
Increasing the radius of the capillary tube
Decreasing the radius of the capillary tube
Increasing the height of water in the vessel

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Physics
The wall of a dam is broader at the base

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

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