Physics
The density of a gas is maximum at

Low temperature, low pressure
Low temperature, high pressure
High temperature, low pressure
High temperature, high pressure

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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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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water at 4°C
Density of the substance to the density of water
Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 0°C

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