Physics
Pipelines in cold countries often burst in winter, because

Pipelines expand due to freezing
Temperature of ice is less than that of water
Water freezes and expands in its volume
Pipelines contract in their volume

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

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

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