Physics
Optical fibres are based on the phenomenon of

Dispersion
Diffraction
Total Internal Reflection
Interference

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Physics
Circuit breaker usually operate under

Transient state of short-circuit current
After D. C. component has ceased
Sub-transient state of short-circuit current
Steady state of short-circuit current

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Physics
It is easier for a man to swim in sea water, than in river water because

The density of sea water is more than the density of river water
The sea is-deeper than the river
The density of sea water is lesser than the density of river water
The sea is wider than the river

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