Physics
Heavy water is used in nuclear reactor to

Increase speed of neutron
Increase temperature
Slow down neutron
Absorb neutron

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Physics
The law of conservation of energy states that

Energy can either be created nor destroyed
Energy can neither be created or destroyed
Energy can neither be created nor destroyed
Energy can either be created or destroyed

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Physics
The velocity of sound in air

Increases with decrease of temperature
Decreases with decrease of temperature
Does not depend on temperature
Decreases with increase of temperature

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