Physics
Ice cubes are added to a glass of pure water and a glass of pure alcohol. The ice would be

At the same level in both
At a higher level in alcohol
At a higher level in water
Floating in alcohol and sinking in water

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

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Physics
Purpose of an optical filter is to

Transmit or absorb light of different colours
Reflect lights of different colours
Dispense light into component colours
Refract light of different colours

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