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
80
40
4000

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Physics
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

at sea level
at the top of Mt. Everest
at a place in a valley below sea level
in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level

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Physics
The bats can fly in the dark because

They have weak legs and are likely to be attacked by predators
They can see the objects in darkness
They generate ultrasonic sound waves
They generate flashes of light

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