Physics
The phenomenon of change in direction of light when it passes from one medium to another is called

Reflection
Dispersion
Propagation
Refraction

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

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

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Physics
Acceleration is

Directly proportional to mass
Inversely proportional to force
Directly proportional to force
Inversely proportional to mass

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