Nuclear and Particle Physics MCQs Question and Answer in Engineering Physics

51

In the quark model which one of the following represents a proton?

A) udd B) uud C) $${\text{u}}\overline {\text{b}} $$ D) $${\text{c}}\overline {\text{c}} $$

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Answer & Solution

Answer: Option B

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52

A nucleus having mass number 240 decays by α-emission to the ground state of its daughter nucleus. The Q value of the process is 5.26 MeV. The energy (in MeV) of the α particle is

A) 5.26 B) 5.17 C) 5.13 D) 5.09

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Answer & Solution

Answer: Option B

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53

A relativistic particle travels a length of 3 × 10^-3 m in air before decaying. The decay process of the particle is dominated by

A) strong interactions B) electromagnetic interactions C) weak interactions D) gravitational interactions

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Answer & Solution

Answer: Option C

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54

Pick the wrong statement.

A) The nuclear force is independent of electric charge B) The Yukawa potential is proportional to $${r^{ - 1}}\exp \left( {\frac{{mc}}{h}r} \right),$$ where r is the separation between two nucleons C) The range of nuclear force is of the order of 10^-15 m - 10^-14 m D) The nucleons interact among each other by the exchange of mesons

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Answer & Solution

Answer: Option C

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55

The strange Baryon $${\sum {} ^ + }$$ has the quark structure

A) uds B) uud C) uus D) $${\text{u}}\overline {\text{s}} $$

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Answer & Solution

Answer: Option C

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56

According to the shell model, the ground state of $${}_8^{15}{\text{O}}$$ nucleus is

A) $$\frac{{{3^ + }}}{2}$$ B) $$\frac{{{1^ + }}}{2}$$ C) $$\frac{{{3^ - }}}{2}$$ D) $$\frac{{{1^ - }}}{2}$$

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Answer & Solution

Answer: Option D

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57

The nuclear spins of $${}_6^{14}{\text{C}}$$ and $${}_{12}^{25}{\text{Mg}}$$ nuclei are respectively,

A) zero and half integer B) half integer and zero C) an integer and half integer D) both half integers

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Answer & Solution

Answer: Option A

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58

A heavy nucleus is found to contain more neutrons than protons. This fact is related to which one of the following statements:

A) The nuclear force between neutrons is stronger than that between protons B) The nuclear force between protons is of a shorter range than those between neutrons, so that a smaller number of protons are held together by the nuclear force C) Protons are unstable, so their number in a nucleus diminishes D) It costs more energy to add a proton to a (heavy) nucleus than a neutron because of the Coulomb repulsion between protons

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Answer & Solution

Answer: Option D

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59

Let $$\left| n \right\rangle $$ and $$\left| p \right\rangle $$ denote the isospin state with $$I = \frac{1}{2},\,{I_3} = \frac{1}{2}$$ and $$I = \frac{1}{2},\,{I_3} = - \frac{1}{2}$$ of a nucleon respectively. Which one of the following two-nucleon states has $$I = 0,\,{I_3} = 0\,?$$

A) $$\frac{1}{{\sqrt 2 }}\left( {\left| {nn} \right\rangle - \left| {pp} \right\rangle } \right)$$ B) $$\frac{1}{{\sqrt 2 }}\left( {\left| {nn} \right\rangle + \left| {pp} \right\rangle } \right)$$ C) $$\frac{1}{{\sqrt 2 }}\left( {\left| {np} \right\rangle - \left| {pn} \right\rangle } \right)$$ D) $$\frac{1}{{\sqrt 2 }}\left( {\left| {np} \right\rangle + \left| {pn} \right\rangle } \right)$$

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Answer & Solution

Answer: Option C

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60

Typical energies released in a nuclear fission and a nuclear fusion reactions are respectively

A) 50 MeV and 1000 MeV B) 200 MeV and 1000 MeV C) 1000 MeV and 50 MeV D) 200 MeV and 10 MeV

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Answer & Solution

Answer: Option D

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