Physics
Two stones of different masses are dropped simultaneously from the top of a building

Depends on the composition of the stone
Smaller stone reaches the ground earlier
Both the stones reach the ground at the same time
Larger stone reaches the ground earlier

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Physics
It is dangerous to observe Solar eclipse with naked eyes because

Cosmic rays reach eyes more during the eclipse
All radiations from sun initiate chemical reactions in eyes
Infrared radiations from sun burn our retina
Ultraviolet radiations from Sun burn our retina

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Physics
The blue colour of sky is due to

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

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