Physics
What is the direction of torque?

Opposite to the direction of applied force
Parallel to the radius
Same as the direction of applied force
Perpendicular to the direction of applied force

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Physics
What is refractive index ?

It is defined as the product of speed of light in medium and 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 ratio of speed of light in the medium to the speed of light 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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