Physics
A bomb explodes on the moon. You will hear its sound on earth after ________

2 hours 20 minutes
You cannot hear the sound of explosion
3.7 hours
20 minutes

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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 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

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