Physics
If the velocity of a body is halved its kinetic energy ________

Become 4 times
Becomes half
Is also doubled
Becomes 1/4 th

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Physics
Rainbow is due to

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

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Physics
It is easier to roll a stone up a sloping road than to lift it vertical upwards because

Work done in rolling a stone is less than in lifting it.
Work done in both is same but the rate of doing work is less in rolling.
Work done in rolling is more than in lifting.
Work done in lifting the stone is equal to rolling it.

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