Question # 1

The A.C used in Pakistan has frequency:

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60 Hz

30 Hz

50 Hz

130 Hz

The colour of live wire is:

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Black or blue

Green or yellow

White or grey

Red or brown

Which among the following radiation has more penetrating power?

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A beta pareticle

A gamma particle

An alpha particle

None of these

Release of energy by the sun is due to

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Nuclear fission

Nuclear fusion

Burning of gases

Chemical reaction

Joule’s law is W=

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IR/t

IRt²

IR²t

I²Rt

by connecting suitable high resistance in series with galvanometer it will convert into:

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voltmeter

galvanometer

ammeter

multimeter

Release of the energy by the sun is due to:

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Nuclear Fussion

Nuclear Fission

Burning of gases

Chemical reaction

Safe limit of radiations exposure in one year.

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4 rem

5 rem

3 rem

6 rem

The symbol of alpha particles is:

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4AHe

42He

0-1B

00Y

When a heavy nucleus splits into lighter nuclei,the process would.

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Release nuclear energy

absorb nuclear energy

Release Chemical energy

Absorb Chemical Energy

The value or current I passing through a conductor is inversely proportional to:

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Temperature

Potential difference

e.m.f.

resistance

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

When 1 kg of Uranium -235 is fused then energy released is

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67 x 10¹⁰ J

67 x 10⁷J

67 J

7 J

the resistance of conductor is inversely to:

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temperature

length

area of cross section

pressure

What happen to the atomic number of an element which emits one alpha particle and a beta particles.

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Increases by 1

Stay the same

Decrease by 2

Decrease by 1

When a Uranium (92 protons)ejects a beta particle, how many protons are left in the remaining nucleus?

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89 Protons

90 Protons

91 Protons

93 Protons

The half life of Lead Pb is

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10 hour

10.10 hours

10.6 hours

1 year

V²/R=:

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Power

Energy

Voltage

Resistance

diamond des not conduct electricity, because it has no:

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free electrons

free protons

free neutrons

free positive charge

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