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

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
It will fall down at the same place where the string breaks

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Physics
The blue colour of water in the sea is due to

Absorption of other colours except blue by water molecules
Reflection of blue light by impurities in sea water
Reflection of blue sky by sea water
Scattering of blue light by water molecules

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Physics
A balloon filled with hydrogen will

Reach a particular height and remain floating
Reach a particular height and start coming down
Continue going upwards uninterrupted
Burst after reaching some height

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