Question # 1

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

The chemical behaviour of an atom is determined by

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binding energy

atomic number

mass number

number of isotopes

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

Mass of proton is

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1.67 x 10^-27kg

1.67 x 10^-31kg

1.66 x 10^-34kg

1.67 x 10^-17kg

Neutron was discovered in

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1915

1920

1925

1932

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

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

The most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

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 isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

Heavy water is made of one oxygen atom and two atoms of:

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Protium

Deuterium

Tritium

Any of these

None of these

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

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

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

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