Question # 1

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.

Neutron was discovered in

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1915

1920

1925

1932

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

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photon

position

antiproton

antineutrino

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

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

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

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

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Protactinium

Actinium

Uranium

Radium

Redon

Neutrons are

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positive charge

negatively charged

massless

neutral

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

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 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 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

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