Question # 1

Which of the following is a brain of computer?

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Central processing unit

Mouse

Monitor

Hard disc

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

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

Electric signal is converted into digital signal by.

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Key board

Monitor

Scanner

Modem

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

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30

40

50

60

Which element is used to make LED?

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Aluminum

Calcium

sodium

Arsenic

Which disk consisting of metal plates for recording.

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Floopy

RAM

HARD

CD

The frequency of the carrier waver used of radio transmission:

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30 KHZ

40 KHZ

50 KHZ

60 KHZ

Operation " 2+3" in computer performed by.

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CU

CPU

ALU

None of these

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 speed of radio wave is:

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Light

Air

Sound

Rocket

The examples of semi - conductors:

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sodium and potassium

calcium and potassium

Germanium and silicon

carbon and nitrogen

The substances through which current can pass easily are called:

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conductors

insulators

Semi - conductors

Non - Electrolytes

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 are electromagnetic waves:

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sound

water waves

Ultrasound

light

Which of the following is used as rectifier;

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semi - conductor diode

resistors

capacitors

Germanium

Word"Computer" is derive from.

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Machine

Calculator

Compute

All of these

Purose of electron gun in TV is to.

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Fire electron

Receive electron

Consume electron

Display picture

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