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Physics

Physics
In SONAR which kind of wave is used?

Infrasonic
Radio
Audible sound
Ultrasonic

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Physics
In a Laser (say neon laser) all the atoms emit the light waves of

Same frequency
Same amplitude
Same phase
All of these

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Physics
The surface tension of water on adding detergent to it

Becomes zero
No change
Increases
Decreases

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Physics
Supersonic plane fly with the speed

of sound
greater than the speed of sound
of light
less than the speed of sound

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Physics
A concave lens always forms

A virtual image
An image type which depends on lens curvature
An image type which depends on object characteristics
A real image

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Physics
A gradual increase in loudness is known as

Crescendo
Timbre
None of these
Fortissimo

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