Physics
'Mirage' is an example of

Dispersion of light only
Total internal reflection of light only
Refraction and total internal reflection of light
Refraction of light only

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Physics
A transformer

Converts electrical energy into mechanical energy
Is used to decrease or increase AC voltage
Converts AC voltage to D.C. voltage
Converts DC to AC

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Physics
Circuit breaker usually operate under

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

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