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
The Hooke's law is valid for

Only proportional region of the stress strain curve
Entire elastic region of the stress strain curve
Elastic as well as plastic region of the stress strain curve
Entire stress strain curve

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

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

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