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Physics

Physics
A device used for converting a.c. into d.c. is called

Induction coil
Transformer
Dynamo
Rectifier

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Physics
In a filament type light bulb most of the electric power consumed appears as

Visible light
Ultra-violet rays
Infra-red rays
Fluorescent light

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Physics
In a optical fibre cable, the signal is propagated along the

Surface and cladding
Both core and cladding
Cladding
Inner Core

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Physics
The pitch of sound depends on its

Amplitude
Intensity
Frequency
Velocity

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Physics
Which among the following waves is used for communication by artificial satellites ?

M.
Radio waves
Micro waves
Frequency of 1016 series

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Physics
The oil in the wick of an oil lamp rises up due to:

Capillary action
Pressure difference
Gravitational force
Low viscosity of oil

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