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Physics

Physics
In SONAR which kind of wave is used?

Infrasonic
Radio
Audible sound
Ultrasonic

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Physics
Water boils at a lower temperature on the hills because

There is less carbon dioxide on the hills
There is a decrease in air pressure on the hills
It is cold on the hills
There is less oxygen

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Physics
Coolis tube is used to produce

Radio waves
X-rays
Micro waves
Gama rays

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Physics
Intensity of sound at a point is ____ its distance from the source.

inversely proportional to square of
directly proportional to
inversely proportional to
directly proportional to square of

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Physics
Which of the following is correct about the properties of Gravitational Forces?

None
They are the strongest forces in nature
They observe inverse square law
Both a and b

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Physics
Which one of the following determines the sharpness of image in a camera ?

The exposure time
The focal length of the lens
Size of the camera
The aperture

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