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

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

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Physics
Scalar Quantities are

Physical quantities which have magnitude only and direction
Physical quantities which have no magnitude only and only direction
Physical quantities which have magnitude only and no direction
Physical quantities which have no magnitude and no direction

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Physics
Super conductors are substances that

Offer minimum resistance to flow of electric current
Conduct electricity at low temperature
Offer high resistance to the flow of electric current
Conduct electricity at high temperature

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