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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Physics
What is a neuron ?

Basic unit of energy
Particle released during radioactivity
Basic unit of nervous system
The anti-particle of neutron

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Physics
Mirage is due to:

Magnetic disturbances in the atmosphere
Depletion of ozone layer in the atmosphere
Unequal heating of different parts of the atmosphere
Equal heating of different parts of the atmosphere

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