Physics
Find the resistance (in mega) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200m.

2000
4000
40
80

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Physics
We always see the same face of the moon, because

It takes equal time for revolution around the earth and rotation on its own axis
It rotates at the same speed as the earth around the sun
It revolves on its axis in adirection opposite to that ofthe earth
It is smaller than the earth

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Physics
Energy in reflected light :

Decreases with the increase in angle of incidence
Increases with the increase in angle
Does not depends on the angle of incidence
Becomes maximum for angle of incidence equal to 45°

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