Physics
Mica is used in electrical appliances such as electric iron because mica is

a bad conductor of heat as well as electricity
a good conductor of heat as well as electricity
a good conductor of heat but a bad conductor of electricity
a bad conductor of heat but a good conductor of electricity

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Physics
Circuit breaker usually operate under

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

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Physics
'Mirage' is an example of

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

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