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

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

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Physics
Why does the sea appear blue in colour?

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

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Physics
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
at the top of Mt. Everest
at sea level
at a place in a valley below sea level

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