Free Nuclear Physics MCQs with Answers
1,254 Nuclear Physics MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.
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1,254 questions · page 53 of 63
- A. 3,3
- B. 6,4
- C. 6,0
- D. 4,6
Explanation: 6 alpha particles and 4 beta particles are emitted.
Correct answer: 6,4- A. 176,69
- B. 172,69
- C. 176,71
- D. 172,71
Explanation: Z =72 - 2 + 1 - 2 - 0 = 69A =180 - 4 - 0 - 4 - 0 = 172
Correct answer: 172,69- A. Almost one, in light elements
- B. Smaller than one, in heavy elements
- C. Greater than one, in heavy elements
- D. Both A and B
Explanation: In light elements:P = NIn heavy elements, the ratio is smaller than one.
Correct answer: Both A and B- A. α-particles
- B. β-particles
- C. X-rays
- D. both A and B
Explanation: α and β-particles both radiate energy as X-rays photons when they are slowed by the electric field of the charged particles in the solid…
Correct answer: X-rays- A. Radium
- B. Protactinium
- C. Uranium
- D. Radon
Explanation: In this question, we are considering the process of beta decay, where a thorium nucleus emits a beta particle (an electron) and transforms…
Correct answer: Protactinium- A. 72 hours
- B. 144 hours
- C. 36 hours
- D. impossible fact
Explanation: After T1/2 the weight of un-decayed radioactive element = 0.5 gAfter 2T1/2 the weight of un-decayed radioactive element = 0.25 g2T1/2=…
Correct answer: 36 hours- A. A option
- B. B option
- C. C option
- D. D option
Explanation: 23592U Number of protons = Number of electrons = Z = 92Number of neutrons N = A-Z = 143
Correct answer: C option- A. 11 electrons, 11 protons and 13 neutrons
- B. 11 electrons, 13 protons and 11 neutrons
- C. 11 protons and 13 neutrons
- D. 11 protons and 13 electrons
Explanation: Nucleus of an atom whose atomic mass is 24 consists of:A = P+N24=11+13So, number of protons = 11Number of neutrons = 13
Correct answer: 11 protons and 13 neutrons- A. Two extra protons and two extra electrons
- B. Two extra protons but no extra electron
- C. Two extra neutrons and no extra electron
- D. Two extra neutrons and two extra electrons
Explanation: For 6C12, p= 6, e = 6, n = 6For 6C14, p= 6, e = 6, n = 8
Correct answer: Two extra neutrons and no extra electron- A. An atomic electron is ejected
- B. An electron which is already present with in the nucleus is ejected
- C. A neutron in the nucleus decays emitting an electron
- D. A part of binding energy of nuclei is converted into electron
Explanation: When ratio of neutrons to protons is more than one, then neutrons convert into protons by emitting an electron.
Correct answer: A neutron in the nucleus decays emitting an electron- A. γ,β,γ
- B. γ,α,β
- C. β,α,γ
- D. α,γ,β
Explanation: When β particle is emitted, the charge will increase.When α particle is emitted, the mass will reduce by 4 and charge will reduce by 2.
Correct answer: β,α,γ- A. α-emission
- B. γ-emission
- C. β-emission
- D. None of these
Explanation: According to the equation:10n → 0-1β + 11H
Correct answer: β-emission1053. What is the correct order of estimated magnitude for the diameter of a typical atomic nucleus?
- A. 10-14 m
- B. 10-18 m
- C. 10-22 m
- D. 10-26 m
Explanation: By definition, the diameter of a typical atomic nuclei is in the order of 10-14 m.
Correct answer: 10-14 m- A. 100 times more than that of the gamma particles
- B. 100 times less than that of an alpha ray
- C. 100 times more than that of an alpha ray
- D. 10 times more than that of an alpha particle
Explanation: Range of β-particle is 100 times more than α-particles.
Correct answer: 100 times more than that of an alpha ray- A. 230, 90
- B. 234, 90
- C. 230. 88
- D. 234, 88
Explanation: The equation can be written as:23892U → 23090Th + 242He + 2 0-1e
Correct answer: 230, 90- A. charge/mass ratio
- B. neutron number
- C. nucleon number
- D. proton number
Explanation: The correct option is d) Proton number. Isotopes of a given element all have the same number of protons, and it is the number of protons…
Correct answer: proton number- A. 21785At
- B. 21577Ir
- C. 20982Pb
- D. 21781Tl
Explanation: According to the equation:21785At → 20982X + 2 42He + 0-1e
Correct answer: 20982Pb- A. A option
- B. B option
- C. C option
- D. D option
Explanation: No of α - particles = 2No of β - particles = 1 The equations can be written as:22286Rn → 21884X + alpha particle21884X → 21482Y + alpha…
Correct answer: B option- A. 500, 125
- B. 1000, 1000
- C. 125, 500
- D. 100, 10
Explanation: The decay of a radioactive substance follows an exponential decay law. The rate of decay at any given time is proportional to the amount…
Correct answer: 500, 125- A. It is random
- B. It is spontaneous
- C. It is exponential
- D. It is non-linear
Explanation: Radioactive sources are random in nature i.e. emission of radioactive particles is unpredictable.
Correct answer: It is random