Question # 1

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

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Free electrons

Valance electrons

Doping

Hole

Energy resources consume dby industries is approximately.

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10%

20%

30%

50%

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 part of atmosphere where all living bodies reside is:

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8 to 20 kilometers

8 to 40 kilometers

8 to 30 kilometers

2 to 10 kilometers

The country, whihc launched its artificial satellite into space for the first time is

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America

France

Russia

Pakistan

Excessive growth in population is also one reason of enhancement in.

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Pollution

Radiations

Conduction

None of them

The major function of electronic devices is to amplify the ........ signals.

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Stronge electric

Semi strong electric

Both a and c

weak electric

The production capacity of research reactor PARR II is;

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17 kilowatt

27 kilowatt

37 kilowatt

47 kilowatt

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

Which circuits carry currents to the lights heaters and other appliances:

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parallel circuits

series circuits

common circuits

All of the above

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

The energy due to motion is called.

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Potential energy

Kinetic energy

Nuclear energy

Chemical energy

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