Physics
Solids have definite shapes.This is because

The forces of adhesion are large
The forces of cohesion are very large
The forces of adhesion are less
The forces of cohesion of the molecules within are very much less in them

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Physics
A balloon filled with hydrogen will

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

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Physics
Mica is used in electrical appliances such as electric iron because mica is

a bad conductor of heat as well as electricity
a good conductor of heat as well as electricity
a bad conductor of heat but a good conductor of electricity
a good conductor of heat but a bad conductor of electricity

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