Physics
Hydraulic brakes work on the principle of

Bernoulli's theorem
Thomson's law
Pascal's law
Newton's law

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Physics
A dynamo is a device which

Creates electrical energy
Creates mechanical energy
Converts mechanical energy into electrical energy
Converts electrical energy into mechanical energy

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Physics
The velocity of sound in air

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

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