Question # 1

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

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decrease

increase

same

none of these

In radio-active decay, the original element which disintegrate to another element is called

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element

daughter element

parent element

none of these

The distance travelled byα-particle in a medium before coming to rest, is called

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range ofγ-particle

range of neutrons

range of particle

none of these

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

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

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

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

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

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A - Z

A + Z

Z

A

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

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

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

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

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

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Water

Heavy water

Carbon

Hydrocarbon

All of these

Neutron was discovered in

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1915

1920

1925

1932

Charge on proton is

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1.59 x 10^-9C

1.59 x 10^-7C

-1.59 x 10^-19C

1.59 x 10^-19C

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)

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

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

When a charged particle passes through matter, it produces ionization, this effect is used in

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fission reaction

reactor

radiation detector

fusion reaction

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

Neutrons are

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positive charge

negatively charged

massless

neutral

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

In 1932 Chadwick discovered

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proton

neutron

photon

electron

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

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

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

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isotones

isomers

isotopes

isobars

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

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