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

A) work done in rolling is more than in lifting
B) work done in lifting the stone is equal to rolling it
C) work done in both is same but the rate of doing work is less in rolling
D) work done in rolling a stone is less than in lifting it

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Pick out the scalar quantity

A) force
B) pressure
C) velocity
D) acceleration

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Light year is a unit of

A) time
B) distance
C) light
D) intensity of light

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Radiocarbon is produced in the atmosphere as a result of

A) collision between fast neutrons and nitrogen nuclei present in the atmosphere
B) action of ultraviolet light from the sun on atmospheric oxygen
C) action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
D) lightning discharge in atmosphere

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Sound waves in air are

A) transverse
B) longitudinal
C) electromagnetic
D) polarised

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