Question # 1

Those elements whose charge number z is greater then __________ are unstable:

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80

79

82

83

The most useful tracer is.

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Strontium -90

Iodine -31

Cobalt -60

Carbon -14

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

Two up quarks and one down quarks makes a

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Proton

Newton

Photon

Meson

Which of the following are not hadrons.

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Muons

Mesons

Positrons

Neutrons

How many neutrons are there in the nuclide Zn⁶⁶?

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22

30

36

66

The number of Neutron is²³⁸U₉₂is

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92

238

146

330

Absorbed Dose 'D' is defined as

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m/E

E/C

C/m

E/m

The charge of an alpha particle is equal to

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-e

+e

-2e

2e

A radio active substance has a half life of four months. 3 -fourth of the substance will decay in:

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6 months

8 months

12 months

16 months

The half life of radioactive elements depends upon

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Temperature

Nature of element

Amount of the radioactive substance

Pressure

The number of Isotopes of cesium are.

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4

32

22

36

I amu =

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9.31 MeV

931 MeV

9.031 MeV

None of above

The background radiation to which we are exposed, on the average is.

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1 mSv per year

2 mSv per year

3 mSv per year

4 mSv per year

Which of the following is typical source of alpha particle.

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Strontium -94

Radon -222

Cobalt -60

Zic sulphate

The radioactive decay obeys the law

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Binding energy per nucleon is maximum for

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Platinum

Iron

Uranium

Lead

X -rays are similar in nature to.

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Gama rays

Beta rays

Alpha rays

Cathode rays

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