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

Refraction of light
Dispersion of light
Reflection 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

The ball will travel towards the center of the circle and fall down
None of these
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
It will fall down at the same place where the string breaks

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

Water in the pipes freezes and on freezing water expands, so pipes break
None of these
Frost makes the pipes rusty, so they break
The material of which pipes are made contracts due to cold and so breaks

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