Question # 1

Which of the following is used as rectifier;

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semi - conductor diode

resistors

capacitors

Germanium

Operation " 2+3" in computer performed by.

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CU

CPU

ALU

None of these

Which disk consisting of metal plates for recording.

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Floopy

RAM

HARD

CD

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

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30

40

50

60

The frequency of the carrier waver used of radio transmission:

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30 KHZ

40 KHZ

50 KHZ

60 KHZ

in binary system. 37 is written as.

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101101

100101

110011

101011

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

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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

Who was the inventor of radio system.

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Grahm bell

F. Crick

Charles babbage

Marconi

Which element is used to make LED?

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Aluminum

Calcium

sodium

Arsenic

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

Electric signal is converted into digital signal by.

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Key board

Monitor

Scanner

Modem

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

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One

Two

Three

Four

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

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