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Online Tests
ECAT Pre General Science Physics Chapter 21 Nuclear Physics Online Test MCQs With Answers
Question # 1
When radioactive nucleus emits a
β-particle, the proton-neutron ratio
Choose an answer
decrease
increase
same
none of these
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Question # 2
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
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Question # 3
The distance travelled by
α-particle in a medium before coming to rest, is called
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range of
γ-particle
range of neutrons
range of particle
none of these
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Question # 4
Structure of the nucleus was explained by
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J.J Thomson
Bohr
Millikan
Rutherford
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Question # 5
Pair production take place when energy of
γ-rays photon is
Choose an answer
equal to 1.02 Mev-
greater than 1.02 Mev
less than 1.02 Mev
none of these
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Question # 6
A curie represents a very strong source of
Choose an answer
α-particle
β-particle
γ-particle
none of these
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Question # 7
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
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Question # 8
Beta particles are
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hydrogen nuclei
helium nuclei
electrons
photons
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Question # 9
For Protium, the mass defect is:
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Infinite
Zero
Very large
A few grams
None of these
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Question # 10
Different radioactive material have
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same half lives
different half lives
same mean lives
same total lives
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Question # 11
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
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Question # 12
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
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Question # 13
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
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Question # 14
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
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Question # 15
Which are not the elementary particles?
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Photons
Leptons
Hadrons
Quarks
None of these
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Question # 16
Examples of moderators used in a fission reactor is/are:
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Water
Heavy water
Carbon
Hydrocarbon
All of these
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Question # 17
Neutron was discovered in
Choose an answer
1915
1920
1925
1932
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Question # 18
Charge on proton is
Choose an answer
1.59 x 10
-9
C
1.59 x 10
-7
C
-1.59 x 10
-19
C
1.59 x 10
-19
C
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Question # 19
The chemical properties of all the isotopes of an elements are
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same
different
slightly different
none of these
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Question # 20
Nucleon means:
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Only electrons
Only neutrons
Only protons
Both (A ) and (C)
Both (B) and (C)
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Question # 21
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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Question # 22
Mass of proton is
Choose an answer
1.67 x 10
-27
kg
1.67 x 10
-31
kg
1.66 x 10
-34
kg
1.67 x 10
-17
kg
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Question # 23
When a charged particle passes through matter, it produces ionization, this effect is used in
Choose an answer
fission reaction
reactor
radiation detector
fusion reaction
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Question # 24
Rate of decay is actually described by.
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Half line
Decay constant
Mean life
Total life
None of these
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Question # 25
Neutrons are
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positive charge
negatively charged
massless
neutral
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Question # 26
Marie curie and Pierre curie discovered:
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Uranium
Polonium
Radium
Both (A) and (C)
Plutonium
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Question # 27
In 1932 Chadwick discovered
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proton
neutron
photon
electron
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Question # 28
Radioactivity was discovered by:
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Becquerel
Marie curie
Pierre curie
All of them
None of these
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Question # 29
A particle having the mass of electron and charge of a proton is called a
Choose an answer
photon
position
antiproton
antineutrino
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Question # 30
Nuclei that have the same charge number but different mass number are called
Choose an answer
isotones
isomers
isotopes
isobars
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Question # 31
According to Rutherford atomic model, the positive charge in an atom
Choose an answer
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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