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

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

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Physics
In a conductor

The forbidden energy gap is very narrow
The valence band and the conduction band overlap each other
There is no conduction band
The forbidden energy gap is very wide

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