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

2 hours 20 minutes
3.7 hours
You cannot hear the sound of explosion
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 as well as electricity
a bad conductor of heat but a good conductor of 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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Physics
The bats can fly in the dark because

They generate flashes of light
They can see the objects in darkness
They have weak legs and are likely to be attacked by predators
They generate ultrasonic sound waves

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