Question # 1

The energy is found from Einstein's mass energy relation is called

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binding energy of electron

binding energy of proton

binding energy of neutron

binding energy of nucleus

When certain nucleus emits aβ-particles, is mass number:

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Remain same

Increases by one

Decreases by one

Decreases by four

None of these

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

Which of the following material has longer half life

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radium

polonium

radium

uranium

Proton was discovered by Rutherford in

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1915

1906

1910

1920

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

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nuclear fission

nuclear fusion

man defect

radioactivity

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

The time required for a radioactive material to decrease in active by one half is called

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half time

half life

disintegration time

mean life

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

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

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

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

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

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