Question # 1

The reciprocal of decay constant λ of a radioactive material is:

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Frequency

Half life

Year

Mean life

None of these

The most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

When certain nucleus emits anα particle, its mass number:

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Increases by one

Decreases by one

Remain same

Decreases by four

None of these

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

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deuteron

deterium

protium

tritium

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

The number of isotopes of hydrogen are

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2

1

3

4

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

Examples of moderators used in a fission reactor is/are:

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Water

Heavy water

Carbon

Hydrocarbon

All 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

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

β-particles are easily deflected by collisions than heavy

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α-particles

β-particles

γ-particles

none of these

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

Referring to the above figure, we can say that of all the elements, the most stable element is

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Phosphours

Iron

uranium

Lithium

Bismuth

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