Question # 1

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

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Valent shell hole

Doping

Hole

None of these

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

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1110100

01011101

1100100

1001001

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

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30

40

50

60

Which of the following are electromagnetic waves:

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sound

water waves

Ultrasound

light

Which of the following is an input device:

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key board

printer

monitor

CPU

Who was the inventor of radio system.

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Grahm bell

F. Crick

Charles babbage

Marconi

The examples of semi - conductors:

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sodium and potassium

calcium and potassium

Germanium and silicon

carbon and nitrogen

Which disk consisting of metal plates for recording.

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Floopy

RAM

HARD

CD

Purose of electron gun in TV is to.

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Fire electron

Receive electron

Consume electron

Display picture

Operation " 2+3" in computer performed by.

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CU

CPU

ALU

None of these

Word FAX is short form of.

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Facsiline

Facsimile

Fasimile

None of these

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

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

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one

Two

Three

Four

The frequency of the carrier waver used of radio transmission:

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30 KHZ

40 KHZ

50 KHZ

60 KHZ

analogue signal is recorded on.

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Magnetic tape

Floppy disk

Hard Disk

C.D

Which of the following is used as rectifier;

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semi - conductor diode

resistors

capacitors

Germanium

The speed of radio wave is:

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Light

Air

Sound

Rocket

The substances through which current can pass easily are called:

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conductors

insulators

Semi - conductors

Non - Electrolytes

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

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Free electron

Holes

Positive ions

Heat

Diodes are used to.

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Convert A.C. into D.C

Convert D.C into A.C

Store Charge

Change voltage

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