Question # 1

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

Which of the following is used as rectifier;

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semi - conductor diode

resistors

capacitors

Germanium

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

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30

40

50

60

The examples of semi - conductors:

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sodium and potassium

calcium and potassium

Germanium and silicon

carbon and nitrogen

Word"Computer" is derive from.

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Machine

Calculator

Compute

All of these

Hovering satellite completes its rotation in 24 hours at the height of:

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360 km

3600 km

36000 km

360000 km

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

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One

Two

Three

Four

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 element is used to make LED?

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Aluminum

Calcium

sodium

Arsenic

Operation " 2+3" in computer performed by.

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CU

CPU

ALU

None of these

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 are electromagnetic waves:

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sound

water waves

Ultrasound

light

Diodes are used to.

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Convert A.C. into D.C

Convert D.C into A.C

Store Charge

Change voltage

Which of the following is a brain of computer?

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Central processing unit

Mouse

Monitor

Hard disc

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

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Free electron

Holes

Positive ions

Heat

The speed of radio wave is:

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Light

Air

Sound

Rocket

Which of the following is an input device:

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key board

printer

monitor

CPU

Which disk consisting of metal plates for recording.

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Floopy

RAM

HARD

CD

Purose of electron gun in TV is to.

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Fire electron

Receive electron

Consume electron

Display picture

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

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1110100

01011101

1100100

1001001

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