Question # 1

The current flow from p-type semi conductors is due to.

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Free electrons

Valance electrons

Doping

Hole

Which disk consisting of metal plates for recording.

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Floopy

RAM

HARD

CD

The substances through which current can pass easily are called:

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conductors

insulators

Semi - conductors

Non - Electrolytes

The frequency of the carrier waver used of radio transmission:

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30 KHZ

40 KHZ

50 KHZ

60 KHZ

The substances through which current con not pass are called:

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Semi - conductors

Insulators

conductors

non - metal

analogue signal is recorded on.

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Magnetic tape

Floppy disk

Hard Disk

C.D

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 element is used to make LED?

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Aluminum

Calcium

sodium

Arsenic

Which of the following are electromagnetic waves:

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sound

water waves

Ultrasound

light

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

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Free electron

Holes

Positive ions

Heat

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

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30

40

50

60

in binary system. 37 is written as.

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101101

100101

110011

101011

Hovering satellite completes its rotation in 24 hours at the height of:

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360 km

3600 km

36000 km

360000 km

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

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