Question # 1

Operation " 2+3" in computer performed by.

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CU

CPU

ALU

None of these

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

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30

40

50

60

The substances through which current can pass easily are called:

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conductors

insulators

Semi - conductors

Non - Electrolytes

Word FAX is short form of.

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Facsiline

Facsimile

Fasimile

None of these

Which of the following are electromagnetic waves:

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sound

water waves

Ultrasound

light

Which of the following is a brain of computer?

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Central processing unit

Mouse

Monitor

Hard disc

The examples of semi - conductors:

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sodium and potassium

calcium and potassium

Germanium and silicon

carbon and nitrogen

The major function of electronic devices is to amplify the ........ signals.

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Stronge electric

Semi strong electric

Both a and c

weak electric

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

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360 km

3600 km

36000 km

360000 km

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

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

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Free electron

Holes

Positive ions

Heat

Which of the following is an input device:

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key board

printer

monitor

CPU

Digital singles are represented by;

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zero and 1

zero and 10

1 and 2

o and 9

analogue signal is recorded on.

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Magnetic tape

Floppy disk

Hard Disk

C.D

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