Physics
The motion of a body that repeats itself after a regular interval of time is

An aperiodic motion
A simple harmonic motion
An oscillatory motion
A periodic motion

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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 rolling is more than in lifting.
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
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Two thin shirts become thicker so prevent transmission of heat
Air layer between two shirts behaves like insulating media
No radiation of heat takes place
Air layer between two shirts works as good conductor

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