Question # 1

Which of the following is used as rectifier;

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semi - conductor diode

resistors

capacitors

Germanium

The deficiency of elctrons in outermost shell of silicon atom is called.

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Valent shell hole

Doping

Hole

None of these

Which of the following is a brain of computer?

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Central processing unit

Mouse

Monitor

Hard disc

The elements used to increase the number of free electrons in the semi - conductor belong to:

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2^nd group

3^rd group

4^th group

5^th group

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

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one

Two

Three

Four

analogue signal is recorded on.

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Magnetic tape

Floppy disk

Hard Disk

C.D

How many electrons Guns are used in colour T.V?

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One

Two

Three

Four

The current flow from p-type semi conductors is due to.

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Free electrons

Valance electrons

Doping

Hole

The substances through which current can pass easily are called:

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conductors

insulators

Semi - conductors

Non - Electrolytes

Word"Computer" is derive from.

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Machine

Calculator

Compute

All of these

Revolutionary charges have occur in last ............. years.

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30

40

50

60

in binary system. 37 is written as.

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101101

100101

110011

101011

The numebr (100)16 in decimal is equal to............. in binary.

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1110100

01011101

1100100

1001001

Digital singles are represented by;

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zero and 1

zero and 10

1 and 2

o and 9

Who was the inventor of radio system.

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Grahm bell

F. Crick

Charles babbage

Marconi

The frequency of the carrier waver used of radio transmission:

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30 KHZ

40 KHZ

50 KHZ

60 KHZ

Which of the following is an input device:

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key board

printer

monitor

CPU

In Pure -semi conductors no free electrons are available to conduct electric current at.

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Ordinary temperature

Low temperature

High temperature

None of these

The speed of radio wave is:

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Light

Air

Sound

Rocket

Which of the following are electromagnetic waves:

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sound

water waves

Ultrasound

light

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