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Physics ECAT Pre Engineering Chapter 21 Nuclear Physics Physics Online Test MCQs With Answers
Question # 1
When a nucleus emits an alpha particle, it atomic mass decreased by
Choose an answer
2
1
4
3
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Question # 2
Structure of the nucleus was explained by
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J.J Thomson
Bohr
Millikan
Rutherford
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Question # 3
Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:
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50
100
150
200
250
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Question # 4
Nucleus consists of
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proton and neutron
protons and electron
electron and neutron
protons only
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Question # 5
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
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Question # 6
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 # 7
The most abundant isotope of neon is
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neon-20
neon-21
neon-22
neon-23
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Question # 8
Alfa particles are
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hydrogen nuclei
helium nuclei
electrons
photons
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Question # 9
Which are not the elementary particles?
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Photons
Leptons
Hadrons
Quarks
None of these
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Question # 10
If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be
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Equal to 1
Less than 1
Greater than 1
Infinity
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Question # 11
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 # 12
Mass of proton is of order of
Choose an answer
10
-31
gm
10
-27
kg
10
-24
gm
10
+27
kg
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Question # 13
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
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Question # 14
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
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Question # 15
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 # 16
An alpha particle has a charge of
Choose an answer
+2e
-2e
-e
+3e
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