Physics
Nuclear Reactors are based on which of the following phenomenon?

None of these
Nuclear Fusion
Controlled Nuclear Fission
Magnetic confinement of Plasma

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Physics
Lightning is produced when

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

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