Physics
Solar eclipse will take place when

the sun is between the moon and the earth
the earth is between the moon and the sun
the moon does not lie on the line joining the sun and the earth
the moon is between the sun and the earth

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is-deeper than the river
The density of sea water is more than the density of river water
The density of sea water is lesser than the density of river water
The sea is wider than the river

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Physics
Conservation of energy refers to the fact that

Energy cannot be created or destroyed but can be converted from one form to another
The entropy of the universe is always increasing
If you conserve energy you will not be as tired
No chemical reaction is 100 percent efficient

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