Physics
Velocity of sound in air does not depend on

Pressure of air
Temperature of air
Humidity of air
Density of air

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Physics
Plants are dried up in winter due to frost because

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

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Physics
Why does the sea appear blue in colour?

Reflection of the sun light from water surface
Scattering of the sunlight by water molecules
Interference of the sun light from water surface
Refraction of the sun light

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