Physics
A white and smooth surface is

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

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Physics
Plants are dried up in winter due to frost because

Photosynthesis does not take place at such low temperature
Evaporation does not take place
Respiration does not take place at low temperature
There is mechanical loss of tissues and drought condition prevails

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Physics
Hydro-electric power is a:

Neither renewable nor non renewable resource
Renewable natural resource
A mixture of renewable and non-renewable natural resource
non-renewable natural resource

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