Question # 1

The advantages of electronic mail are:

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Fast communication

Cost free service

More efficient

All of these

The voltage is decreased by:

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Step-up transformer

Step-down transformer

A.C. generator

D.C. Motor

100x10³ A= :

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10^-3 A

10^-2 A

10 A

10^-1A

Those quantities whose values change gradually or stay constant are called:

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Physical quantities

Digital quantities

Log quantities

Analog quantities

Two charged spheres are separated by 2 mm. Which of the following would produced the greatest attractive force?

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+1 q and +4q

-1 q and -4q

+2 q and +2q

+2 q and -2q

A device which has two ways communication is:

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Television

Radio

Hard disk

Mobile phone

The speed of sound in iron at 25 ^oC is ms^-1

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5950

5900

6950

6940

What is the power rating of a lamp connected to a 12 v source when it carries 2.5 A?

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4.8 W

14.5 W

30 W

60 W

Example of mechanical waves is:

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Radio waves

X-rays

Light waves

Sound waves

F=

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qE

q-E

q/E

q+E

Circuit breaker works on the principle of:

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Electric current

Magnetism

Electromagnetism

Electrostatics

Big unit of capacitance is:

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Farad

Volt

Watt

Coulomb

Mice can hear frequencies upto:

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100, 000 Hz

25.000 Hz

120,000 Hz

1,000 Hz

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