Physics
The velocity of sound in moist air is more than in dry air because the moist air has

Less pressure than dry air.
Less density than dry air.
More density than dry air.
More pressure than dry air.

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Physics
Rainbows are produced when sunlight :

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.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction

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