Physics
According to special theory of relativity the mass of a particle

Decreases with decrease in velocity.
Decreases with increase in velocity.
Is independent of its velocity.
Increases with increase in velocity with respect to an observer.

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Physics
Air moves from the region where the air ________

Humidity is high to the region where the humidity is low
Pressure is low to the region where the pressure is high
Humidity is low to the region where the humidity is high
Pressure is high to the region where the pressure is low

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Physics
Rainbow is due to

refraction and reflection of sunlight by water droplets
diffusion of sunlight through water droplets
absorption of sunlight in minute water droplets
ionisation of water deposits

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