Physics
When a steel ball is placed on the surface of mercury, it does not sink because

The density of mercury is greater than that of steel
Of the high viscosity of mercury
Mercury is a semisolid
Of the surface tension of mercury

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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
None of these
The ball will travel towards the center of the circle and fall down
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

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Physics
What is a neuron ?

Basic unit of energy
Particle released during radioactivity
The anti-particle of neutron
Basic unit of nervous system

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