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Previous Year Questions

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Board, class, subject, chapter, year-wise PYQ. Practice effectively and ace your board exams.

9,374 Questions
CBSE
#1 Class 12 Physics Nuclei 2022 Short 3M
Calculate the energy released in MeV in the deuterium-tritium fusion reaction: $$^{2}_{1}\text{H} + ^{3}_{1}\text{H} \to ^{4}_{2}\text{He} + ^{1}_{0}\text{n}$$ Given: $m(^2\text{H}) = 2.014102$ u, $m(^3\text{H}) = 3.0...
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CBSE
#2 Class 12 Physics Nuclei 2022 Short 3M
What are the utilities of (a) moderator, (b) coolant and (c) control rods in a nuclear reactor?
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CBSE
#3 Class 12 Physics Nuclei 2008 Short 2M
Define the multiplication factor of a fissionable mass. Give its physical significance.
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CBSE
#4 Class 12 Physics Nuclei 2021 Short 2M
What are uncontrolled and controlled chain reactions?
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CBSE
#5 Class 12 Physics Nuclei 2022 Long 5M
What is nuclear fission? Explain how a chain reaction can occur in a fissionable material.
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CBSE
#6 Class 12 Physics Nuclei 2022 Short 3M
What are nuclear forces? Give their important properties.
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CBSE
#7 Class 12 Physics Nuclei 2020 Short 2M
What is the mass defect of a nucleus? Express it mathematically. What light does it throw on the binding energy of the nucleus?
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CBSE
#8 Class 12 Physics Nuclei 2021 Short 2M
How is the size of a nucleus estimated? Write the relation between the radius of a nucleus and its mass number.
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CBSE
#9 Class 12 Physics Nuclei 2020 Mcq 1M
Nuclear force is
A. long range
B. short range
C. infinite range
D. zero range
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CBSE
#10 Class 12 Physics Nuclei 2019 Mcq 1M
A stable nucleus has
A. high binding energy
B. low binding energy
C. zero binding energy
D. negative mass defect
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CBSE
#11 Class 12 Physics Nuclei 2018 Mcq 1M
Mass defect is due to
A. Coulomb force
B. Nuclear force
C. Gravitational force
D. Weak force
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CBSE
#12 Class 12 Physics Nuclei 2020 Mcq 1M
The binding energy per nucleon is maximum for
A. Uranium
B. Iron
C. Helium
D. Hydrogen
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CBSE
#13 Class 12 Physics Nuclei 2019 Mcq 1M
The radius of a nucleus is proportional to
A. $A$
B. $A^2$
C. $A^3$
D. $A^{1/3}$
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CBSE
#14 Class 12 Physics Nuclei 2021 Mcq 1M
Which of the following statements about nuclear forces is NOT true?
A. Nuclear force falls rapidly to zero for distance > few femtometres
B. Nuclear force is much weaker than Coulomb force
C. Force is attractive for $r > 0.8$ fm and repulsive for $r < 0.8$ fm
D. Nuclear force between n-n, p-n and p-p is approximately the same
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CBSE
#15 Class 12 Physics Nuclei 2022 Long 1M
Assertion (A): Nuclei having mass number about 60 are most stable. Reason (R): When two or more light nuclei are combined into a heavier nucleus, the binding energy per nucleon decreases.
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CBSE
#16 Class 12 Physics Nuclei 2021 Mcq 1M
The ratio of the nuclear densities of two nuclei having mass numbers 8 and 27 is
A. 08:27
B. 03:02
C. 02:03
D. 01:01
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CBSE
#17 Class 12 Physics Nuclei 2022 Long 1M
Assertion: Energy is released in nuclear fission. Reason: Total binding energy of the fission fragments is larger than the total binding energy of the parent nucleus.
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CBSE
#18 Class 12 Physics Nuclei 2021 Long 1M
Assertion: Between any two given energy levels, the number of absorption transitions is always less than the number of emission transitions. Reason: Absorption transitions start from the lowest level only and may end ...
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CBSE
#19 Class 12 Physics Nuclei 2022 Long 1M
Assertion: Isobars are elements having same mass number but different atomic number. Reason: Neutrons and protons are present inside the nucleus.
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CBSE
#20 Class 12 Physics Nuclei 2021 Mcq 1M
An element has binding energy 8 eV per nucleon. If it has a total binding energy of 128 eV, then the number of nucleons is
A. 8
B. 16
C. 32
D. 64
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