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
The blue colour of water in the sea is due to

Reflection of blue light by impurities in sea water
Scattering of blue light by water molecules
Reflection of blue sky by sea water
Absorption of other colours except blue by water molecules

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Physics
Purpose of an optical filter is to

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

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Physics
Should cars have bumpers that collapse under impact?

Yes, since they help to absorb the impact of a collision and keep the occupants safe
Yes, since the offending car should get damaged and pay for the mistake
No, since it would be very expensive to get the car repaired
No, since the colliding car would then ram into the occupants and kill them

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