Question # 1

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

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Circulation of blood

Cancer

Heart Attack

Thyroid glands

The quantity of U in the naturally occurring uranium is.

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0.2%

0.3%

0.7%

0.4%

Charge on an electron was determined by

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Ampere

Millikan

Maxwell

Bohr

The place for soring the nuclear waste is

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Ocean

Damping in earth

Damping in desert

Bottom of old salt mines

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

The unit of radioactivity is:

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Bequerel

Henry

Pascal

Joule

The types of quacks are.

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2

3

4

6

Subatomic particles are divided into groups.

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Photon

Laptons

Hadrons

All of these

Both xenon and caesium each have:

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41 isotopes

36 isotopes

43 isotopes

33 isotopes

The binding energy per nucleon is maximum for

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Helium

Iron

Potassium

Radium

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

Gamma radiations are emitted due to:

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De-excitation of atom

De-excitation of nucleus

Excitation of atom

Excitation of nucleus

By emitting Beta particle and gama particle simultaneously the nucleolus changes in its charges by

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N

N/2

N/4

3N/4

The early Greeks believed that matter waves was

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Discrete

Continuous

Both continuous and discrete

All of above

The energy of photon for photoelectric effect is less than

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1 MeV

2 MeV

5 MeV

8 MeV

The half life of radioactive elements depends upon

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Temperature

Nature of element

Amount of the radioactive substance

Pressure

The bnding energy for nucleus A is 7.7 Me V and that for nucleus B is 7.8 MeV. Which nucleus has the larger mass?

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Nucleas A

Nucleus B

Less than nucleus

None of these

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

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19

20

21

22

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

Nuclear fission chain reaction is controlled by using.

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Cadmium rods

Iron rods

Platinum rods

Steel rods

A particles equal or greater in mass than of protons are called.

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Baryons

Leptons

Mesons

Quarks

The mass of protons is:

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1.675 x 10^-27 kg

1.693 x 10^-27 kg

1.673 x 10^-31 kg

1.673 x 10^-27 kg

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