Physics
The redness in atmosphere at Sunrise and Sunset is due to :

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

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Physics
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

It will fall down at the same place where the string breaks
It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
None of these
The ball will travel towards the center of the circle and fall down

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Physics
Stars twinkle because

the distance of the stars from the earth changes with time.
None of these
the refractive index of the different layers of the earth's atmosphere ch
the intensity of light emitted by them changes with time.

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