Question # 1

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

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

Which of the following material has longer half life

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radium

polonium

radium

uranium

The nucleus left after the emission of some radiation is called:

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Parent nucleus

Daughter necleus

Mother necleus

Any of these

None of these

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

The number of isotopes of hydrogen are

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2

1

3

4

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

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decrease

increase

same

none of these

The energy acquired by a mass of 1g moving with the speed of light is

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3 x 10⁸J

9 x 10¹³J

3 x 10¹³J

9 x 10¹⁶J

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

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 unit of decay constant is

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sex

sec²

sec^-1

sec^-2

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

The nucleus/nuclei of hydrogen is/are:

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Proton

Deuteron

Triton

All of these

None of these

Radioactivity

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is exhibited more by semiconductors in general

in exhibited more by the element when they are coupled

with other radioactive elements by a covalent bond

is an atomic property of radioactive elements

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

Three quarks make:

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An electron

A meson

A baryon

A photon

None of these

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

Neon gas have three isotopes whose atomic numbers are

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20, 24 , 23

20, 21 , 22

20, 19 , 21

none of these

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

1 amu is equal to

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-34kg

1.66 x 10^-27kg

Neutron was suggested to be in the nucleus by:

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Rutherford in 1920

Bohar in 1913

Dirac in 1928

Anderson in 1932

None of these

The half life of radioactive substances depends upon

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amount of substance

energy of substance

state of substance

temperature of substance

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

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