Question # 1

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

The nucleus/nuclei of hydrogen is/are:

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Proton

Deuteron

Triton

All of these

None of these

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

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decrease

increase

same

none of these

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

In radioactive decay, the new element which is formed due to the disintegration of original element is called

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element

daughter element

parent element

none of these

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

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

A mass difference of 0.0012 u is equivalent to and energy of:

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0.5 Me V

1.13 MeV

5.13 MeV

1.13 keV

1.13 eV

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

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A - Z

A

Z

A + Z

An alpha particle has a charge of

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+2e

-2e

-e

+3e

Neutron was discovered in

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1915

1920

1925

1932

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 chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

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

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

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

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

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

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

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Water

Heavy water

Carbon

Hydrocarbon

All of these

The missing mass which is converted to energy in the formation of nucleus, is called

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packing fraction

mass defect

binding energy

none of these

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

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

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

Electrons are

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positive charged

negatively charged

massless

neutral

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