Question # 1

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

The dead time of G.M tube is.

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10^-1 sec

10^-6sec

10^-4sec

10^-8sec

One joule of energy absorbed per kilogram of a body is

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Roentgen

Grey

Rem

Curie

1 gray is equal to.

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1 JKg-1

1KgJ-1

1JKg

1 JKg-2

Cosmic rays consist of

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Protons

High energy photons

Positron

All of above

Iodine -131 is used for the treatment by

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Bones

Eyes

thyroid glands

Lungs

The quantity of U in the naturally occurring uranium is.

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0.2%

0.3%

0.7%

0.4%

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

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Circulation of blood

Cancer

Heart Attack

Thyroid glands

The radio active nuclide ₈₆Ra²²⁸ decays by a series of emissions of three alpha particles and one beta particle. The nuclide X finally formed is:

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₆₄X²²⁰

₈₆X²²²

₈₄X²¹⁶

₈₈X²¹⁵

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

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

Alpha particle carries a charge.

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-e

+2e

-2e

No charge

Materials can be identified by measuring their

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Mass

Half life

Both a and b

None of a,b,c

The mass of proton in amu is:

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1.07276

1.7276

1.007276

1.0007276

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

The half life of radioactive elements depends upon

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Temperature

Nature of element

Amount of the radioactive substance

Pressure

The energy of photon for photoelectric effect is less than

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1 MeV

2 MeV

5 MeV

8 MeV

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

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