Nuclear And Particle Physics — Part 1 MCQs with Explanations

In the field of nuclear and particle physics, when it comes to detecting trace amounts of a gaseous species in a mixture of gases, the preferred probing tool is laser spectroscopy . Laser spectroscopy is a highly sensitive technique that utilizes laser light to interact with atoms or molecules, leading to characteristic absorption, emission, or scattering of light. This technique allows for precise identification and quantification of trace elements or species within a complex mixture of gases. While other spectroscopic techniques like ionization spectroscopy with X-rays (Option A), NMR spectroscopy (Option B), and ESR spectroscopy (Option C) are valuable in various contexts, they may not offer the same level of sensitivity and specificity as laser spectroscopy when it comes to detecting trace amounts of gaseous species in a mixture. Therefore, Option D: laser spectroscopy is the preferred probing tool for detecting trace amounts of a gaseous species in a mixture of gases in the field of nuclear and particle physics.

Neptunium series is the correct answer to “Which one of the following disintegration series of the heavy elements will give 209 Bi as a stable nucleus”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

10-6 eV is the correct answer to “The lifetime of an atomic state is 1ns. The natural line width of the spectral line in the emission spectrum of this state is of the order of”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

The process is not allowed because ΔS ≠ 1 and $$\Delta {I_3} \ne 0$$ is the correct answer to “The quark content of $$\sum {^ + } ,\,{K^ - },\,{\pi ^ - }$$ and p is indicated: $$\left| {\sum {^ + } } \right\rangle = \left| {uus} \right\rangle ;\,\left| {{K^ + }} \right\rangle = \left| {s\overline u } \right\rangle ;\,\left| \pi \right\rangle = \left| d \right\rangle ;\,\left| p \right\rangle = \left| {uud} \right\rangle $$ In the process, $${\pi ^ - } + p \to {K^ - } + \sum {^ + } ,$$ considering strong interactions only, which of the following statements is true”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

$${\left( {{}^1{s_{1/2}}} \right)^2}{\left( {{}^1{p_{3/2}}} \right)^3};\,J = \frac{3}{2}$$ is the correct answer to “The four possible configurations of neutrons in the ground state of $${}_4^9Be$$ nucleus according to the shell model, and the associated nuclear spin are listed below. Choose the correct one”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

energy distribution of electrons is the correct answer to “In the β-decay of neutron n → p + e - + $$\overline V e$$ , the anti-neutrino $$\overline V e$$ escapes detection. Its existence is inferred from the measurement of”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

strong and electromagnetic interactions is the correct answer to “The strangeness quantum number is conserved in”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

charge conjugation is the correct answer to “The cross-sections of the reactions $$p + {\prod {} ^ - } \to {\sum {} ^ - } + {K^ + }$$ and $${p^ - } + {\prod {} ^ + } \to {\overline {\sum {} } ^ - } + {K^ - }$$ at a given energy are the same due to”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

same energy is the correct answer to “A neutron scatters elastically from a heavy nucleus. The initial and final states of the neutron have the”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

1.39Δ MeV/c2 is the correct answer to “The mass difference between the pair of mirror nuclei $${}_6^{11}C$$ and $${}_5^{11}B$$ is given to be Δ MeV/c 2 . According to the semi-empirical mass formula, the mass difference between the pair of mirror nuclei $${}_9^{17}F$$ and $${}_8^{17}O$$ will approximately be (rest mass of proton m p = 938.27 MeV/c 2 and rest mass of neutron m n = 939.57 MeV/c 2 )”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

Nmn + Zmp + $$\frac{{BE}}{{{c^2}}}$$ is the correct answer to “Consider a nucleus with N neutrons and Z protons. If m p , m n and BE represents the mass of the proton, the mass of the neutron and the binding energy of the nucleus respectively and c is the velocity of light in free space, the mass of the nucleus is given by”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

0, -3 is the correct answer to “The isospin and the strangeness of $${\Omega ^ - }$$ Baryon are”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

Spin independent is the correct answer to “With reference to nuclear forces which of the following statements is not true”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

pion is the correct answer to “Choose the particle with zero Baryon number from the options given below.”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

(6+; 400 keV) is the correct answer to “The first three energy levels of $${}_{90}^{228}Th$$ are shown below. 4 + __________ 187 keV 2 + __________ 57.5 keV 0 + __________ 0 keV The expected spin parity and energy of the next level are given by”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

one, zero, zero and one is the correct answer to “The Baryon number of proton, the lepton number of proton, the Baryon number of electron and the lepton number of electron are respectively”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

$$\overline p + n \to {\pi ^ - } + {\pi ^0}$$ is the correct answer to “Which one of the following reaction is allowed”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

A2/3 is the correct answer to “The semi-empirical mass formula for the binding energy of nucleus contains a surface correction term. This term depends on the mass number A of the nucleus as”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

μ- → e+ + e- + e- is the correct answer to “Which of the following decay is forbidden”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

d → u + e- + $$\overline {{V_e}} $$ is the correct answer to “The basic process underlying the neutron β decay is”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

tritium is radioactive is the correct answer to “In the deuterium + tritium (d + t) fusion more energy is released as compared to deuterium + deuterium (d + d) fusion because”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

$${e^ + } + n \to p + \nu $$ is the correct answer to “Which of the following reactions violates lepton number conservation”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

they have excess of neutrons is the correct answer to “Fission fragments are generally radioactive as”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

$$\frac{{{1^ - }}}{2}$$ is the correct answer to “In the nuclear shell model the spin parity of 15 N is given by”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

5.26 MeV is the correct answer to “The disintegration energy is defined to be the difference in the rest energy between the initial and final states. Consider the following process: $${}_{94}^{240}{\text{Pu}} \to {}_{92}^{236}{\text{U}} + {}_2^4{\text{He}}$$ The emitted α-particle has a kinetic energy 5.17 MeV. The value of the disintegration energy is”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

mass number is the correct answer to “The volume of a nucleus in an atom is proportional to the”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

$$ - \frac{a}{r} + br$$ is the correct answer to “The interaction potential between two quarks, separated by a distance r inside a nucleon can be described by (a, b and β are positive constants)”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

$$u\overline s $$ is the correct answer to “According to the Quark model, the K + meson is composed which of the following quarks”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

$$\frac{{{5^ + }}}{2}$$ is the correct answer to “According to the single particle nuclear shell model, the spin parity of the ground state of $${}_8^{17}O$$ is”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

2.3 is the correct answer to “A ferromagnetic mixture of iron and copper having 75% atoms of Fe exhibits a saturation magnetization of 1.3 × 10 6 Am -1 . Assume that the total number of atoms per unit volume is 8 × 10 28 m -3 . The magnetic moment of an iron atom in terms of the Bohr magneton is”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

$$\overline {\text{v}} $$ + p → n + e+ is the correct answer to “Which one of the following nuclear processes is forbidden”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

$$B = {a_1}A - {a_2}{A^{2/3}} - {a_3}\frac{{Z\left( {Z - 1} \right)}}{{{A^{1/3}}}} - {a_4}\frac{{{{\left( {A - 2Z} \right)}^2}}}{A} + \delta $$ is the correct answer to “Which of the following expressions for total binding energy B of a nucleus is correct (a 1 , a 2 , a 3 , a 4 > 0”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

The Hamiltonian does not conserve that total angular momentum is the correct answer to “The ground state wave function of deuteron is in a superposition of s and d states. Which of the following is not true as a consequence”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

$$\frac{{{5^ + }}}{2}$$ is the correct answer to “According to the shell model the ground state spin of the 17 O nucleus is”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

$$\frac{1}{4}{V_0}\left( r \right){\text{ and }} - \frac{3}{4}{V_0}\left( r \right)$$ is the correct answer to “Two spin-1/2 fermions having spins $$\overrightarrow {{S_1}} $$ and $$\overrightarrow {{S_2}} $$ interact via a potential $$V\left( r \right) = \overrightarrow {{S_1}} .\overrightarrow {{S_2}} \,{V_0}\left( r \right).$$ The contributions of this potential in the singlet and triplet states, respectively are”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

the particle is a boson is the correct answer to “A stationary particle in free space is observed to spontaneously decay into two photons. This implies that”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

spin dependent and have a non-central part is the correct answer to “Nuclear forces are”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

1-iii, 2-ii, 3-i is the correct answer to “Match the reactions on the left with the associated interactions on the right. 1. π + → μ + + v μ i. Strong 2. π 0 → γ + γ ii. Electromagnetic 3. π 0 → n → π - + p iii. Weak”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

the secondary particles produced in a nuclear reaction in the detector medium is the correct answer to “A neutron passing through a detector is detected because of”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.

1024 × 103 is the correct answer to “Half-life of a radioisotope is 4 × 10 8 years. If there are 10 3 radioactive nuclei in a sample today, the number of such nuclei in the sample 4 × 10 9 years ago were”. This question is standard in competitive examination syllabi for Nuclear And Particle Physics.