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

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

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Physics
Rainbows are produced when sunlight :

Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
None of the given statements is correct.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.

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Physics
Inside an aeroplane, flying at a high altitude,

normal humidity and partial vacuum are maintained.
the pressure is the same as that outside.
normal atmospheric pressure is maintained by the use of air pumps.
the pressure inside is less than the pressure outside.

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