Question # 1

Radioactivity happen due to the disintegration of

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Nucleus

Mass

Electrons

Protons

The unit of radioactivity is:

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Bequerel

Henry

Pascal

Joule

Gamma radiations are emitted due to:

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De-excitation of atom

De-excitation of nucleus

Excitation of atom

Excitation of nucleus

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 activity of radioactive sample

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Is constant

Increases with time

Decreases linearly with time

Decreases exponentially with time

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 radioactive decay obeys the law

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The SI unit of decay constant is

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m

m^-1

S^-1

Nm^-1

Nuclear fission was discovered by:

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Otto Hahn

Friz strassmann

Both a and b

Michaelson

When a nucleus emits alpha particle its atomic mass decreases by

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1

2

3

4

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

1 amu is equal to

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1.0606 x 10^-27 kg

1.66 x 10^-31 kg

1.66 x 10^-34 kg

1.66 x 10^-19 kg

The first atomic reactor was introduced by

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Currie

Enrico Fermi

Newton

Bohr

The mass of proton in amu is:

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1.07276

1.7276

1.007276

1.0007276

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 most abundant isotope of neon is:

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Neon 21

Neon 20

Neon 22

None of above

How many neutrons are there in the nuclide Zn⁶⁶?

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22

30

36

66

The charge on Beta particle is

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+e

-e

-2e

None of these

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