Physics
A solid needle placed horizontally on the surface of the water floats due to

Viscosity of water
Capillary action
Surface tension of water
Water pressure

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Physics
What is a compound microscope?

A microscope whose lenses are convex.
A microscope that has one lens.
A microscope whose lenses are concave.
A microscope that has two sets of lenses : an occular lens and an eyepiece.

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Physics
Super conductors are substances that

Offer high resistance to the flow of electric current
Conduct electricity at high temperature
Conduct electricity at low temperature
Offer minimum resistance to flow of electric current

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Physics
In the process of magnetisation of a bar

The entire bulk of the bar gets magnetised
Only the surface of the bar gets magnetised
Only some parts of the outer layers of the bar get magnetised
Only the ends of the bar get magnetised

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