Physics
A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.

The mercury level starts rising
The mercury level starts falling
The bell jar breaks up
The mercury level does not change

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

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.
Electromagnetic waves do not show interference and diffraction.

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