Physics
Green house effect is the heating up of the Earth's atmosphere which is due to

X-rays
G-rays
The infra-red rays
The ultraviolet rays

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Physics
It is easier to roll a stone up a sloping road than to lift it vertical upwards because

Work done in both is same but the rate of doing work is less in rolling.
Work done in rolling is more than in lifting.
Work done in lifting the stone is equal to rolling it.
Work done in rolling a stone is less than in lifting it.

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Above a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value depending on amount of water in the pail
Above a certain minimum value depending on amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail

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