Physics
The blue colour of sky is due to

Reflection of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere
Refraction of sunlight
Scattering of longer wavelengths of sunlight in the atmosphere

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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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Physics
In the process of magnetisation of a bar

Only the ends of the bar get magnetised
The entire bulk of the bar gets magnetised
Only some parts of the outer layers of the bar get magnetised
Only the surface of the bar gets magnetised

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Physics
The wall of a dam is broader at the base

Because streamlining is required
To withstand pressure that is increased with atmospheric pressure
To withstand pressure that increases with depth
To withstand pressure that increases in a horizontal plane

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