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

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

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Physics
A cyclist leans inwards when he is negotiating a curve so that

Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
No frictional force may be produced between the wheels and the axle
He may increase his speed
His weight may be reduced

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Physics
What is a compound microscope?

A microscope that has one lens.
A microscope whose lenses are convex.
A microscope whose lenses are concave.
A microscope that has two sets of lenses : an occular lens and an eyepiece.

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