Physics
X-rays region lies between

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

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Physics
'Mirage' is an example of

Total internal reflection of light only
Refraction of light only
Dispersion of light only
Refraction and total internal reflection of light

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Physics
Planets are

non-luminous heavenly bodies
luminous heavenly bodies revolving around a star
luminous heavenly bodies that twinkle
luminous heavenly bodies that do not twinkle

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