Physics
A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.

The mercury level does not change
The bell jar breaks up
The mercury level starts falling
The mercury level starts rising

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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 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.
Work done in both is same but the rate of doing work is less in rolling.

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