Communication Systems
The colour of an object is decided by

None of these
The wavelength transmitted through it
Reflected colour for opaque object and wavelength transmitted through it for transparent objects
The reflected colour

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Communication Systems
In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then

Amplitude of distant sidebands decreases
Amplitude of distant sidebands increases
Amplitude of distant sidebands remains constant
Amplitude of distant sidebands first increases, then decreases

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