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

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

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Physics
Plants are dried up in winter due to frost because

Photosynthesis does not take place at such low temperature
There is mechanical loss of tissues and drought condition prevails
Evaporation does not take place
Respiration does not take place at low temperature

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