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

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

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

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Physics
A standing wave occurs when

The amplitude of a wave exceeds its wavelength
Two waves overlap
The speed of the wave is zero or near zero
A wave reflects upon itself

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