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Physics

Physics
A wheel-barrow is an example of

Class I lever
Pulley system
Class II lever
Class III lever

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Physics
An electric iron of 750 W is used for S hours per day. Then the energy consumed in one day by the iron is:

600 units
6 units
60 units
0.6 units

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Physics
Intensity of sound has

an object existence
both subjective and objective existence
a subject existence
no existence

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

Hertz
Phon
Decibel
Sone

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Physics
What is the name of the device used to convert alternating current into direct current ?

Galvanometer
Rectifier
Transformer
Ammeter

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Physics
The hair of shaving brush clings together when removed from water due to

Viscosity
Friction
Elasticity
Surface tension

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