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 lifting the stone is equal to rolling it.
Work done in rolling is more than in lifting.
Work done in rolling a stone is less than in lifting it.

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

cohesion of water is greater than its adhesion with glass.
density of mercury is greater than that of water.
cohesion of mercury is greater than its adhesion with glass.
mercury is a metal.

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