Question # 1

Examples of moderators used in a fission reactor is/are:

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Water

Heavy water

Carbon

Hydrocarbon

All of these

The range ofβ-particle in air is greater than that ofα-particle by

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1000 times

100 times

15 times

10 times

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

After alpha decay the atomic number of the atom

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increase by four

decreases by two

increases by two

decrease by four

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

Rutherford performed an experiment on nuclear reactions in:

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1718 A.D

1818 A.D

1918 A.D

2001 A.D.

1701 A.D.

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

The rate of decay of a radioactive substance

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decrease exponentially with time

decreases linearly with time

increases linearly with time

increases exponentially with time

In 1932 Chadwick discovered

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proton

neutron

photon

electron

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

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-4

4

2

1

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

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A - Z

A + Z

Z

A

Pair production take place when energy ofγ-rays photon is

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equal to 1.02 Mev-

greater than 1.02 Mev

less than 1.02 Mev

none of these

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

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