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

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

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Physics
Which of the following occurred first ?

Wright Brothers successfully flew an aircraft
Guglielmo Marconi sent out the first wireless signals
Albert Einstein propounded the General Theory of Relativity
Max Planck unveiled the Quantum Theory

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Physics
RADAR is used for:

locating geostationary satellites.
locating submerged submarines.
receiving a signals in a radio receiver.
detecting and locating the position of objects such as Aeroplanes.

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