Nuclear and Particle Physics MCQs Question and Answer in Engineering Physics

41

Suppose that a neutron at rest in free space decays into a proton and an electron. This process would violate

A) conservation of charge B) conservation of energy C) conservation of linear momentum D) conservation of angular momentum

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

42

A thermal neutron having speed v impinges on a ²³⁵U nucleus. The reaction cross-section is proportional to

A) v^-1 B) v C) v^1/2 D) v^-1/2

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

43

Which of the following functions describes the nature of interaction potential V(r) between two quarks inside a nucleon? (r is the distance between the quarks and a and b positive constants of suitable dimensions).

A) $$V\left( r \right) = \frac{a}{r} + br$$ B) $$V\left( r \right) = - \frac{a}{r} + br$$ C) $$V\left( r \right) = \frac{a}{r} - br$$ D) $$V\left( r \right) = - \frac{a}{r} - br$$

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

44

The experimentally measured spin g factors of proton and a neutron indicate that

A) both proton and neutron are elementary point particles B) both proton and neutron are not elementary point particles C) while proton is an elementary point particle, neutron is not D) while neutron is an elementary point particle, proton is not

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

45

An O¹⁶ nucleus is spherical and has a charge radius R and a volume $${\text{V}} = \frac{4}{3}\pi {{\text{R}}^3}.$$ According to the empirical observations of the charge radii, the volume of the ₅₄¹²⁸Xe nucleus assumed to be spherical is

A) 8 V B) 2 V C) 6.75 V D) 1.89 V

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

46

The spin and parity of $${}_4^9{\text{Be}}$$ nucleus as predicted by the shell model are respectively

A) 3/2 and odd B) 1/2 and odd C) 3/2 and even D) 1/2 and even

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

47

The evidence for the non-conservation of parity β in β-decay has been obtained from the observation that the β intensity

A) antiparallel to the nuclear spin directions is same as that along the nuclear spin direction B) antiparallel to the nuclear spin direction is not the same as that along the nuclear spin direction C) shows a continuous distribution as a function of momentum D) is independent of the nuclear spin direction

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

48

The masses of a hydrogen atom, neutron and $${}_{92}^{238}{\text{U}}$$ are given by 1.0078, 1.0087 and 238.0508 respectively. The binding energy of $${}_{92}^{238}{\text{U}}$$ is therefore approximately equal to (taking 1 amu = 931.64 MeV)

A) 120 MeV B) 1500 MeV C) 1600 MeV D) 1800 MeV

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

49

Which one of the following nuclear reactions is possible?

A) $${}_7^{14}N \to {}_6^{13}C + {\beta ^ + } + {v_c}$$ B) $${}_7^{13}N \to {}_6^{13}C + {\beta ^ + } + {v_c}$$ C) $${}_7^{13}N \to {}_6^{13}C + {\beta ^ + }$$ D) $${}_7^{13}N \to {}_7^{13}C + {\beta ^ + } + {v_c}$$

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

50

The asymmetry terms in the Weizsacker semi-empirical mass formula is because of

A) non-spherical shape of the nucleus B) non-zero spin-of nucleus C) unequal number of protons and neutrons inside the nucleus D) odd number of protons inside the nucleus

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board