Physics
During thunderstorm you are travelling in a car. To protect yourself from the lightning you will have to

Remain in the car
Abandon the car and take shelter under a nearby tree
Get out of the car and lie flat in the ground
Touch the nearest electric pole

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Physics
What is refractive index ?

It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
None of above
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
It is defined as the product of speed of light in medium and in vacuum.

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Physics
Plants are dried up in winter due to frost because

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

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