Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

Both suffer the same change in momentum
The rubber ball suffers greater change in momentum
The metal ball suffers greater change in momentum
The initial momentum of the rubber ball is greater than that of the metal ball

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Physics
Solids have definite shapes.This is because

The forces of adhesion are large
The forces of cohesion are very large
The forces of cohesion of the molecules within are very much less in them
The forces of adhesion are less

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Physics
Siphon will fail to work if:

Both its limbs are of unequal length.
The densities of the liquid in the two vessels are equal.
The temperature of the liquids in the two vessels are the same.
The level of the liquid in the two vessels are at the same height.

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