Physics
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

4.2 seconds
4.2 years
42 seconds
42 years

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Physics
Plants are dried up in winter due to frost because

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

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