Question # 1

In nuclear radiation , track of alpha particle is.

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Thin

Discontinuous

Erratic

Continuous

When gama rays are emitted, the nuclear mass.

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Decreases by 4 units

Does not change

Increases by 2 units

Increase by 1 unit

Subatomic particles are divided into groups.

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Photon

Laptons

Hadrons

All of these

Which is true for both alpha particle and gama rays.

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They cause ionization in air

They can be deflected by electric field

They can be deflected by magnetic field

The y can penetrate a few millimeters of aluminium

Low level radiations effects

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Less of hair

Ulceration

Drop of white blood cells

All

1 amu is equal to

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1.0606 x 10^-27 kg

1.66 x 10^-31 kg

1.66 x 10^-34 kg

1.66 x 10^-19 kg

Cosmic rays consist of

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Protons

High energy photons

Positron

All of above

The mass spectrum of naturally occurring neon shows the most abundant isotope has atomic mass.

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19

20

21

22

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

For workers in nuclear facilities is, a weekly does of is normally considered safe

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1.0 msv

5.0 msv

2.0 msv

3.0 msv

The dead time of G.M tube is.

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10^-1 sec

10^-6sec

10^-4sec

10^-8sec

The particles which do not experience strong force are called.

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Baryons

Hadrons

Mesons

Laptons

When a nucleus emits alpha particle its atomic mass decreases by

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1

2

3

4

Which of the following is typical source of alpha particle.

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Strontium -94

Radon -222

Cobalt -60

Zic sulphate

The number of neutron present in a nucleus in a given by

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N = A+Z

N = A- z

N = Z - A

N = A X Z

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

Marie Curie and Pierre Curie discovered.

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Uranium

Uranium and Radium

Polonium and radium

Radium

Circulation of blood is studied by radio isotope.

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Cobalt -60

Phosphorus -32

Sodium -24

Iodine -131

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