Question # 1

A device that shows the visible path of ionizing particle is called.

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GM counter

Solid state detector

Scalar

Wilson cloud chamber

Cosmic rays consist of

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Protons

High energy photons

Positron

All of above

Which of the following is typical source of alpha particle.

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Strontium -94

Radon -222

Cobalt -60

Zic sulphate

The particles which do not experience strong force are called.

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Baryons

Hadrons

Mesons

Laptons

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

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

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19

20

21

22

GM counter uses

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Alcohol only

Bromine

argon

Neon and bromine

The mass spectrum of naturally occurring neon, showing

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1 isotope

2 isotope

3 isotope

4 isotope

The scientist who suggested the presence of neutron was:

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Bohr

Rutherford

Chadwick

J.J Thomson

Both xenon and caesium each have:

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41 isotopes

36 isotopes

43 isotopes

33 isotopes

The Unit of decay constant.

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Second

(second)-1

m-1

mk

When a nucleus emits an alpha particle, its atomic mass decreases by

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1

2

3

4

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

The building blocks of protons and neutrons are called.

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Ions

Electrons

Positrons

quarks

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

How many neutrons are there in the nuclide Zn⁶⁶?

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22

30

36

66

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

The moderator used in a nuclear reactor

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Sodium

Uranium

Graphite

Cadmium

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