Physics
A mirage occurs because of

Diffraction of light
Total internal reflection by layers of air
Reflection by hot ground
Interference of light

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Physics
Indicate the false statement about the resistance of a wire

It is directly proportional to the length of wire
Resistance of metallic wire increases with increase in temperature
It is directly proportional to the area of cross-section of wire
It depends on material of wire

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Physics
X-rays region lies between

Gamma-rays and ultraviolet region
Visible and infra-red region
Short radio waves and long radio waves
Ultraviolet and visible region

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