Question # 1

The speed of radio wave is:

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Light

Air

Sound

Rocket

The examples of semi - conductors:

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sodium and potassium

calcium and potassium

Germanium and silicon

carbon and nitrogen

The frequency of the carrier waver used of radio transmission:

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30 KHZ

40 KHZ

50 KHZ

60 KHZ

The number of hovering satellites which can send transmissions to all over the world:

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one

Two

Three

Four

In P-type semi -conductior, most of the current is due to.

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Free electron

Holes

Positive ions

Heat

Purose of electron gun in TV is to.

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Fire electron

Receive electron

Consume electron

Display picture

Word FAX is short form of.

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Facsiline

Facsimile

Fasimile

None of these

Operation " 2+3" in computer performed by.

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CU

CPU

ALU

None of these

Diodes are used to.

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Convert A.C. into D.C

Convert D.C into A.C

Store Charge

Change voltage

in binary system. 37 is written as.

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101101

100101

110011

101011

Digital singles are represented by;

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zero and 1

zero and 10

1 and 2

o and 9

Word"Computer" is derive from.

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Machine

Calculator

Compute

All of these

The substances through which current con not pass are called:

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Semi - conductors

Insulators

conductors

non - metal

Electric signal is converted into digital signal by.

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Key board

Monitor

Scanner

Modem

Which element is used to make LED?

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Aluminum

Calcium

sodium

Arsenic

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