Question # 1

A particle having the mass of electron and charge of a proton is called a

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photon

position

antiproton

antineutrino

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called

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deuterium

protium

tritium

none of these

The number of isotopes of hydrogen are

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2

1

3

4

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

Binding energy per nucleus is

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greater for heavy nucleus

least for heavy nucleus

greatest for light nuclei

decreases for medium weight niclei

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

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

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

Which of the following material has smaller has life

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uranium

polonium

radium

radian

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

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

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A - Z

A + Z

Z

A

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

The half life of radioactive substances depends upon

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amount of substance

energy of substance

state of substance

temperature of substance

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