Physics
Which of the following devices can be used to detect radiant heat ?

Six's maximum and minimum thermometer
Thermopile
Constant volume air thermometer
Liquid thermometer

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

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

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