Question # 1

isotopes are atom of same element with different.

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Atomic mass

Atomic number

Number of proton

Number of electron

The equivalent resistance of a parallel combination is:

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Equal to sum of all resistance

Is greater than the largest resistance of combination

Is smaller than the smallest resistance of combination

All of these

Radiations present in atmosphere due to the presence of different radioactive elements are:

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Cosmic radiations

Background radiations

secondary radiations

Electromagnetic radiations

The symbol of alpha particles is:

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4AHe

42He

0-1B

00Y

The half life of carbon -14 is:

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5730 years

5740 years

5750 years

5760 years

The reason carbon dating work is that.

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Plants and animals are such strong emitters of carbon 14

After a plant or animal dies, it stops in fresh carbon

There is so much non radioactive carbon dioxide in the air

When a plant or animal dies.

The rating of a fuse wire is always expressed in:

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ampere-hours

KWh

Volts

Amperes

The half life of radium - 226 is 1620 years. If N is its total amount then after the four half lives, its left amount will be:

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1/2 N

1/4 N

1/8 N

1/16 N

The property of substance, which opposes the flow of current through it is called:

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Resistance

Reactance

Resistivity

None

an ideal voltmeter is that which draws:

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small current

no current

high current

none of these

The A.C used in Pakistan has frequency:

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60 Hz

30 Hz

50 Hz

130 Hz

The commercial unit of electrical energy is:

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Joule

Watt

Kilowatt hour

Electron volt

a fuse is connected in series with:

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neutral wire

live wire

earth wire

cable wire

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