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Physics

Physics
The waves used in sonography are

Infra-red waves
Sound waves
Ultrasonic waves
Micro waves

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Physics
One nanometer is equal to ________ meters.

10 raised to the power (-12)
10 raised to the power (-3)
10 raised to the power (-6)
10 raised to the power (-9)

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

Steel
Glass pieces
Stone chips
Glass - wool

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Physics
A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the body is: [Given g = 9.8 m/s2]

1568 W
1568 J
1568 N
1568 C

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Physics
A rear-view mirror for driving is

Plain
Inverted
Convex
Concave

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Physics
Which of the following is the unit of perceived loudness of sound ?

Phon
Decibel
Sone
Hertz

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