Question # 1

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

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3

2

6

5

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

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

The emission of radiations take place in elements, having charge number greater than

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109

82

69

52

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

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

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

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-4

4

2

1

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

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

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

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isotones

isomers

isotopes

isobars

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 chemical behaviour of an atom is determined by

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binding energy

atomic number

mass number

number of isotopes

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

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

During the nuclear changes, the law/s of conservation that hold/s are that of:

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Charge

energy

Momentum

Mass

All of these

Rutherford performed an experiment on nuclear reactions in:

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1718 A.D

1818 A.D

1918 A.D

2001 A.D.

1701 A.D.

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

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Protactinium

Actinium

Uranium

Radium

Redon

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 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

Radiation detector are used to

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measure intensity of radiation

measure energy of radiation

difference between different types of radiation

all the above

The range ofβ-particle in air is greater than that ofα-particle by

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1000 times

100 times

15 times

10 times

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

Neutron was discovered in

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1915

1920

1925

1932

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

Neutron was suggested to be in the nucleus by:

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Rutherford in 1920

Bohar in 1913

Dirac in 1928

Anderson in 1932

None of these

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

The range of particle depends upon the factor

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charge, mass and energy of particle

density of medium

ionization potential of the atoms

all the above

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

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A - Z

A + Z

Z

A

Radioactivity

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is exhibited more by semiconductors in general

in exhibited more by the element when they are coupled

with other radioactive elements by a covalent bond

is an atomic property of radioactive elements

Binding energy per nucleus is

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greater for heavy nucleus

least for heavy nucleus

greatest for light nuclei

decreases for medium weight niclei

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

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