Physics
When the Sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is

Reflection of light
Scattering of light
Dispersion of light
Refraction of light

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

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