Physics
Solids have definite shapes.This is because

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

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Physics
In total internal reflection, the light travel from

Rarer to denser medium and it occurs with no loss of intensity
Rarer to denser medium and it occurs with loss of intensity
Denser to rarer medium and it occurs with loss of intensity
Denser to rarer medium and it occurs with no loss of intensity

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Physics
RADAR is used for:

locating submerged submarines.
locating geostationary satellites.
detecting and locating the position of objects such as Aeroplanes.
receiving a signals in a radio receiver.

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