Physics
A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously ?

They must have the same density
They must have the same mass
They must have the same volume
They must be dropped in vacuum

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Physics
Circuit breaker usually operate under

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

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