Physics
A piece of wood is held under water. The upthrust on it will be:

More than weight of the wood
Less than weight of the wood
Zero
Equal to the weight of the wood

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

the friction between sand and feet is less than that between concrete and feet.
the sand is grainy but concrete is smooth.
the friction between sand and feet is more than that between concrete and feet.
sand is soft and concreter is hard.

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Physics
A white and smooth surface is

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

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