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Physics

Physics
In MRI machine, which one of the following is used?

X-ray
Magnetic wave
Sound wave
Ultra-sound wave

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Physics
Microphone is a device which transforms the

Light signal into sound signal
Sound signal into current signal
Current signal into sound signal
Sound signal into light signal

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Physics
Bubbles of air rise up through liquids due to

Viscosity and buoyancy
Surface tension and adherence
Air current over the liquid and buoyancy
Up thrust and surface tension

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Physics
Which is best used as a sound absorbing material in partition walls ?

Glass pieces
Stone chips
Steel
Glass - wool

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Physics
The base of an electric iron is brightly polished mainly

To make it more durable
To make it rust-proof
To reduce heat loss by radiation
To make it smooth and frictionless

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Physics
Which of the following is used for regulated electric supply ?

Zener diode
Junction diode
Gun diode
Tunnel diode

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