Question # 1

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

During the nuclear changes, the law/s of conservation that hold/s are that of:

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Charge

energy

Momentum

Mass

All of these

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

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polonium uranium

uranium and radium

polonium and radium

none of these

A mass difference of 0.0012 u is equivalent to and energy of:

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0.5 Me V

1.13 MeV

5.13 MeV

1.13 keV

1.13 eV

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

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

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Protactinium

Actinium

Uranium

Radium

Redon

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

When a nucleus emits an alpha particle, it atomic mass decreased by

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2

1

4

3

The rate of decay of radioactive substance

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is constant

decrease exponentially with time

varies inversely as time

decreases linearly with time

The half life of uranium-238 is

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6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

Which of the following material has longer half life

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radium

polonium

radium

uranium

Mass of neutron is

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1.67 x 10^-31kg

1.67 x 10^-27kg

9.1 x 10^-31kg

1.67 x 10^-19kg

In 1932 Chadwick discovered

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proton

neutron

photon

electron

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

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ECAT Physics Chapter 21 Nuclear Physics Online Test MCQs With Answers

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