Physics
Mirage is due to:

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

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Physics
What is a compound microscope?

A microscope whose lenses are convex.
A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope whose lenses are concave.
A microscope that has one lens.

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Physics
Analog synthesis refers to a technology based on

Representing physical quantities as numbers.
Representing data in terms of measurable physical quantities.
Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.
Interfacing synthesizer equipment.

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Physics
Why does the sea appear blue in colour?

Reflection of the sun light from water surface
Interference of the sun light from water surface
Refraction of the sun light
Scattering of the sunlight by water molecules

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