Physics
Vehicles use ________ to see the objects coming from behind.

Convex lens
Concave mirror
Concave lens
Convex mirror

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Physics
For an ideal gas, which one of the following statements does not hold true?

The kinetic energies of all gas molecules are not same
There is no interactive force between the molecules.
The speed of all gas molecules is same
The potential energy of the gas molecules is zero

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

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