Question # 1

Rutherford performed on experiment on a nuclear reaction in:

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1921

1981

1927

1932

The early Greeks believed that matter waves was

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Discrete

Continuous

Both continuous and discrete

All of above

Low level radiations effects

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Less of hair

Ulceration

Drop of white blood cells

All

Energy needed to produce an electron hole in solid state detector is.

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1 to 2 eV

3 to 4 eV

6 to 7 eV

8 to 9 eV

By emitting Beta particle and gama particle simultaneously the nucleolus changes in its charges by

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N

N/2

N/4

3N/4

Curie is unit of.

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Conductivity

Binding energy

Radioactivity

Resistivity

The amount of energy equivalent to 1 a.m.u is

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931.5 MeV

93.15 MeV

9.315 MeV

2.224 MeV

Binding energy per nucleus for uranium is above:

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6.7 Mev

7.7 Mev

6.9 MeV

7.9 MeV

The moderator used in a nuclear reactor

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Sodium

Uranium

Graphite

Cadmium

In Wilson cloud chamber, ß-particles leave

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Thin and continuous tracks

Thick and continuous tracks

No tracks

Thin and discontinuous tracks

A positron is a particle having.

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Mass equal to electron

Charge equal to electron

Mass equal to mass of electron but charge opposite to charge of electron.

Mass equal to proton

There is no charge in A and Z of any radioactive element by the emission of.

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Alpha particle

Beta particle

Gama particle

X- rays

Half life of Uranium -239 is

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26.5 minutes

24.5 minutes

25.5 minutes

23.5 minutes

The quantity of U in the naturally occurring uranium is.

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0.2%

0.3%

0.7%

0.4%

Which one of the following is not affected by electric or magnetic field.

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Beta rays

Gama ryas

Alpha rays

Electron

The charge of an alpha particle is equal to

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-e

+e

-2e

2e

Before and after nuclear reaction the number of protons and neutrons:

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Must be different

Must be decreased

Must be increased

Remains same

Two up quarks and one down quarks makes a

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Proton

Newton

Photon

Meson

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