Physics
Sun appears red in colour at sunrise and sunset due to

The fact that sun emits only red colour at that time
Red light having longer wave length scatters away
That all other colours scatter away except red
That sun comes out of the mountains

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Physics
Purpose of an optical filter is to

Dispense light into component colours
Refract light of different colours
Reflect lights of different colours
Transmit or absorb light of different colours

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Physics
A drop of liquid assumes spherical shape because:

Inter molecular forces are weak in liquids
A sphere has the least surface area for a given volume
A sphere has the largest surface area for a given volume
Intermolecular forces are strong in liquids

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