Physics
Boyle's law is a relationship between

Volume and temperature
Pressure and volume
Pressure and temperature
Volume and density

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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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Physics
Stationary wave is formed by

Two waves of same frequency travelling in the opposite direction
A transverse wave superposing a longitudinal wave
Two waves of same frequency travelling in the same direction
Two waves of the same speed superposing

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