Physics
Which of the following are used for accurately measuring very small time intervals ?

Atomic clocks
White dwarfs
Pulsars
Quartz clocks

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Physics
Plants are dried up in winter due to frost because

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

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