Physics
A balloon filled with hydrogen will

Continue going upwards uninterrupted
Reach a particular height and remain floating
Reach a particular height and start coming down
Burst after reaching some height

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

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

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