Physics
Specific gravity is defined as the ratio of

Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 4°C
Density of the substance to the density of water
Density of the substance to the density of water at 0°C

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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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