Question # 1

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 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 disk consisting of metal plates for recording.

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Floopy

RAM

HARD

CD

Which of the following is used as rectifier;

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semi - conductor diode

resistors

capacitors

Germanium

The substances through which current con not pass are called:

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Semi - conductors

Insulators

conductors

non - metal

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 deficiency of elctrons in outermost shell of silicon atom is called.

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Valent shell hole

Doping

Hole

None of these

Electric signal is converted into digital signal by.

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Key board

Monitor

Scanner

Modem

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

Operation " 2+3" in computer performed by.

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CU

CPU

ALU

None of these

Word"Computer" is derive from.

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Machine

Calculator

Compute

All of these

analogue signal is recorded on.

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Magnetic tape

Floppy disk

Hard Disk

C.D

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

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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

Which of the following are electromagnetic waves:

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sound

water waves

Ultrasound

light

English word "9" has been divided into ............ segments.

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5

6

7

8

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

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one

Two

Three

Four

The examples of semi - conductors:

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sodium and potassium

calcium and potassium

Germanium and silicon

carbon and nitrogen

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General Science 10th Class English Medium Chapter 9 Online Test MCQs With Answers

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