Physics
The lift of an aeroplane is caused by

Pascel's law
Law of gravitation
Theorem of continuity
Bernouli's theorem

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Physics
What is refractive index ?

It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
None of above
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
It is defined as the product of speed of light in medium and in vacuum.

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Physics
Which of the following options correctly explains the term heat budget?

It is the balance between incoming and outgoing radiation
It is the amount of heat which the surface of earth receives from the sun.
It is the radiation from the earth in the form of long waves.
It is a mode of transfer of heat through matter by molecular activity.

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Physics
Which one of the following is not a property of electromagnetic waves?

Electromagnetic waves do not show interference and diffraction.
Electromagnetic waves are transverse waves
Oscillating electric field and magnetic field are perpendicular to each other.
Electromagnetic waves do not require a medium to propagate.

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