Physics
Supercooling is cooling of liquid ________

At melting point
Below freezing point
Below melting point
Above melting point

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Physics
Planets do not twinkle because

Their distance from the earth does not change with time
They are very far away from the earth resulting in decrease in intensity of light
They are nearer to earth and hence we receive a greater amount of light.
They emit light of a constant intensity

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Physics
Rainbows are produced when sunlight :

Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
None of the given statements is correct.

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