Question # 1

The dead time of G.M tube is.

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10^-1 sec

10^-6sec

10^-4sec

10^-8sec

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

Gamma rays from cobalt -60 are used for treatment of.

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Circulation of blood

Cancer

Heart Attack

Thyroid glands

Subatomic particles are divided into groups.

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Photon

Laptons

Hadrons

All of these

The first atomic reactor was introduced by

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Currie

Enrico Fermi

Newton

Bohr

A proton consists of quarks which are.

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Two up, one down

One up, two down

All up

All down

The Unit of decay constant.

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Second

(second)-1

m-1

mk

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

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19

20

21

22

Nuclear fission chain reaction is controlled by using.

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Cadmium rods

Iron rods

Platinum rods

Steel rods

Absorbed Dose 'D' is defined as

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m/E

E/C

C/m

E/m

Cosmic rays consist of

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Protons

High energy photons

Positron

All of above

When nitrogen is bombarded by alpha particles nitrogen nucleus changes into

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Oxygen

Carbon

Barium

Helium

Bottom quark carries charge :

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2/3 e

-2/3 e

+1/3 e

-1 /3 e

The half life of radioactive elements depends upon

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Temperature

Nature of element

Amount of the radioactive substance

Pressure

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

The unit of radioactivity is:

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Bequerel

Henry

Pascal

Joule

The mass spectrum of naturally occurring neon, showing

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1 isotope

2 isotope

3 isotope

4 isotope

How many neutrons are there in the nuclide Zn⁶⁶?

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22

30

36

66

What is difference is isotopes

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Number of protons

Number of neutrons

Number of electrons

Charge number

GM counter uses

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Alcohol only

Bromine

argon

Neon and bromine

The binding energy for_________ is maximum.

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Copper

Glass

Iron

Aluminum

When a nucleus emits alpha particle its atomic mass decreases by

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1

2

3

4

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