Physics
The apparent weight of a man in a lift is less the real weight when :

The lift is going up with uniform speed
The lift is going up with an acceleration
The lift is going down with an acceleration
The lift is going down with uniform speed

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Physics
Circuit breaker usually operate under

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

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