Physics
The spring balance works on the principle of ________ .

Pascal's Law
Hooke's Law
Boyle's Law
Bernoulli's principle

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

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Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Plastics have a lower density than metals
Plastics have a higher thermal conductivity than metals
Metals are good conductors of heat
Metals have higher thermal capacity than plastics

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