Question # 1

the number of (101)₁₀ in decimal is equal to .......... inbinary.

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0101111

0000101

10101101

1100101

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

The examples of semi - conductors:

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sodium and potassium

calcium and potassium

Germanium and silicon

carbon and nitrogen

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

Electric signal is converted into digital signal by.

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Key board

Monitor

Scanner

Modem

Digital singles are represented by;

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zero and 1

zero and 10

1 and 2

o and 9

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

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 substances through which current con not pass are called:

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Semi - conductors

Insulators

conductors

non - metal

Which of the following is used as rectifier;

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semi - conductor diode

resistors

capacitors

Germanium

Word FAX is short form of.

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Facsiline

Facsimile

Fasimile

None of these

Which disk consisting of metal plates for recording.

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Floopy

RAM

HARD

CD

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

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1110100

01011101

1100100

1001001

The speed of radio wave is:

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Light

Air

Sound

Rocket

Purose of electron gun in TV is to.

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Fire electron

Receive electron

Consume electron

Display picture

Word"Computer" is derive from.

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Machine

Calculator

Compute

All of these

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

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one

Two

Three

Four

Operation " 2+3" in computer performed by.

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CU

CPU

ALU

None of these

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