Question # 1

The nuclei of an element having the same charge number but different mass numbers are called:

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Isobars

Isotopes

Isomers

Isobaric

Isothermal

Nuclei that have the same charge number but different mass number are called

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isotones

isomers

isotopes

isobars

1 amu is equal to.

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-24kg

1.66 x 10^-27kg

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

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

The most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

When a nucleus emits an alpha particles, its charge number decreases by

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3

2

6

5

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

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

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

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

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

The nucleus/nuclei of hydrogen is/are:

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Proton

Deuteron

Triton

All of these

None of these

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

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photon

position

antiproton

antineutrino

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

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