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#1 Class 12 Physics Semiconductor 2020 Mcq 1M CBSE

The formation of depletion region in a p-n junction diode is due to

A. movement of dopant atoms

B. diffusion of both electrons and holes

C. drift of electrons only

D. drift of holes only

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#2 Class 12 Physics Semiconductor 2021 Short 2M CBSE

In an extrinsic semiconductor, the number density of holes is $4 \times 10^{20}$ m$^{-3}$. If the number density of intrinsic carriers is $1.2 \times 10^{45}$ m$^{-3}$, find the number density of electrons in it.

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#3 Class 12 Physics Nuclei 2022 Short 2M CBSE

What is the nuclear radius of $^{125}$Fe, if that of $^{27}$Al is 3.6 fermi?

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#4 Class 12 Physics Nuclei 2023 Short 5M CBSE

A coin has a mass of 3.0 g and is entirely made of $^{63}_{29}$Cu atoms (mass 62.92960 u). Calculate the nuclear energy required to separate all neutrons and protons from each other. Given: $m_p = 1.007825$ u, $m_n = ...

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#5 Class 12 Physics Nuclei 2022 Short 2M CBSE

Binding energy per nucleon vs mass number curve for nuclei is shown in the figure. W, X, Y and Z are four nuclei indicated on the curve. Identify which nucleus is most likely to undergo: (i) Nuclear Fission, (ii) Nucl...

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#6 Class 12 Physics Nuclei 2025 Short 3M CBSE

A fast-moving neutron collides with the nucleus of Plutonium ($^{239}$Pu), producing Xenon ($^{134}$Xe) and Zirconium ($^{103}$Zr) along with neutrons. (I) Write the nuclear fission reaction. (II) Find the number of n...

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#7 Class 12 Physics Nuclei 2022 Long 5M CBSE

Give reasons for: (a) Lighter elements are better moderators for a nuclear reactor than heavier elements. (b) In a natural uranium reactor, heavy water is preferred over ordinary water as moderator. (c) Cadmium rods a...

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#8 Class 12 Physics Nuclei 2021 Short 3M CBSE

Explain giving necessary reactions how energy is released during: (i) nuclear fission, (ii) nuclear fusion.

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#9 Class 12 Physics Nuclei 2022 Short 3M CBSE

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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#10 Class 12 Physics Nuclei 2022 Short 3M CBSE

What are the utilities of (a) moderator, (b) coolant and (c) control rods in a nuclear reactor?

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#11 Class 12 Physics Nuclei 2008 Short 2M CBSE

Define the multiplication factor of a fissionable mass. Give its physical significance.

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#12 Class 12 Physics Nuclei 2021 Short 2M CBSE

What are uncontrolled and controlled chain reactions?

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#13 Class 12 Physics Nuclei 2022 Long 5M CBSE

What is nuclear fission? Explain how a chain reaction can occur in a fissionable material.

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#14 Class 12 Physics Nuclei 2022 Short 3M CBSE

What are nuclear forces? Give their important properties.

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#15 Class 12 Physics Nuclei 2020 Short 2M CBSE

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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#16 Class 12 Physics Nuclei 2021 Short 2M CBSE

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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#17 Class 12 Physics Nuclei 2020 Mcq 1M CBSE

Nuclear force is

A. long range

B. short range

C. infinite range

D. zero range

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#18 Class 12 Physics Nuclei 2019 Mcq 1M CBSE

A stable nucleus has

A. high binding energy

B. low binding energy

C. zero binding energy

D. negative mass defect

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#19 Class 12 Physics Nuclei 2018 Mcq 1M CBSE

Mass defect is due to

A. Coulomb force

B. Nuclear force

C. Gravitational force

D. Weak force

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#20 Class 12 Physics Nuclei 2020 Mcq 1M CBSE

The binding energy per nucleon is maximum for

A. Uranium

B. Iron

C. Helium

D. Hydrogen

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