Physics
When the speed of car is doubled, then what will be the braking force of the car to stop it in the same distance ?

Four times
One-fourth
Two times
Half

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Physics
Lightning is produced when

Clouds strike against impurities in air and the friction burns up these impurities
Strong opposite charges in different clouds break down the resistance offered by the intervening air
Similar charges of electricity rush towards each other and then get repelled
Water vapour produces electricity in the clouds

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Physics
What is a compound microscope?

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

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