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 element is used to make LED?

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Aluminum

Calcium

sodium

Arsenic

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

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One

Two

Three

Four

Electric signal is converted into digital signal by.

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Key board

Monitor

Scanner

Modem

Which of the following is an input device:

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key board

printer

monitor

CPU

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

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1110100

01011101

1100100

1001001

Which of the following are electromagnetic waves:

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sound

water waves

Ultrasound

light

in binary system. 37 is written as.

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101101

100101

110011

101011

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

Which of the following is used as rectifier;

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semi - conductor diode

resistors

capacitors

Germanium

analogue signal is recorded on.

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Magnetic tape

Floppy disk

Hard Disk

C.D

The substances through which current con not pass are called:

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Semi - conductors

Insulators

conductors

non - metal

Word"Computer" is derive from.

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Machine

Calculator

Compute

All of these

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

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Free electron

Holes

Positive ions

Heat

Word FAX is short form of.

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Facsiline

Facsimile

Fasimile

None of these

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