Question # 1

A,C electric supply at homes:

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240 volt

50 volt

220 volt

1000 volt

The potential difference between tow paints in a circuit is measured by:

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Galvanometer

Ammeter

Voltmeter

Multi - meter

Which element is used to make LED?

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Aluminum

Calcium

sodium

Arsenic

Element having atomic numebr greater than.......... go on emitting radiations.

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80

92

82

83

The number of hydrogen isotopes;

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3

2

8

10

The Si unit of energy :

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meter per second

meter

joule

kilowatt hour

The potential of the neutral wire is.

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Zero

+220 volts

220 volts

Changing

Electric signal is converted into digital signal by.

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Key board

Monitor

Scanner

Modem

Energy possessed bu a body due to its motion is known as:

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Kinetic energy

Heat energy

Electric energy

Chemical

Natural gas is measured in:

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square meter

cubic meters

Btu

B and C both

America launched its first space station in to space.

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Apallo -1

Skylab -1

Both a and b

None

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

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Free electron

Holes

Positive ions

Heat

The device use to store electric current:

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Fuse

Switch

Resistor

Capacitor

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 total production capacity of Pakistan's first nuclear power plant is.

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10 mega watt

137 mega watt

300 mega watt

40 mega watt

The device used for turning a circuit ON or OFF is.

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Switch

Fuse

Circuit breaker

Earth wire

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