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 8 of 63
- A. An atomic electron is ejected
- B. An electron which 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. Decreases
- B. Increases
- C. Remains the same
- D. None of the above
Explanation: Option B is correct because when a radioactive nucleus emits a beta particle, the proton-neutron ratio increases because the mass number…
Correct answer: Increases- A. An α-particle has charge +4e
- B. When α particle travel through air, they cause ionization
- C. When α-particle travel through a sheet of gold foil, they can not make the gold radioactive
- D. None of the above
Explanation: Option B is correct because alpha particles have high ionization power but low penetrating power.
Correct answer: When α particle travel through air, they cause ionization- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Option D is correct because during the decay of a neptunium nucleus with the emission of a β-particle and γ-radiation, the proton number…
Correct answer: Option D- A. Beta particles
- B. Gamma particles
- C. Alpha particles
- D. X-rays
Explanation: Option A is correct because the transformation of a neutron into a proton in the nucleus gives rise to the emission of a beta (β)…
Correct answer: Beta particles- A. 1st orbit
- B. Nucleus
- C. 2nd orbit
- D. Valence Shell
Explanation: Option B is correct because the electron (e^-) is emitted from the parent nucleus 234Th92 during the process of radioactive decay.
Correct answer: Nucleus147. According to the equation AZ X → Y + 3 α particles, what are the atomic and mass numbers of 'Y'?
- A. Z - 6, A - 12
- B. Z + 1, A
- C. Z - 2, A - 4
- D. Z + 3, A
Explanation: Option A is correct because the equation shows that 3 alpha particles are emitted from the nucleus.
Correct answer: Z - 6, A - 12- A. n1 = 8, n2 = 8
- B. n1 = 8, n2 = 6
- C. n1 = 6, n2 = 6
- D. n1 = 6, n2 = 8
Explanation: The radioactive decay series you've described involves the transformation of uranium-238 (^238U) into lead-206 (^206Pb) through a sequence…
Correct answer: n1 = 8, n2 = 6- A. γ-rays
- B. α-particles
- C. β-rays
- D. X-rays
Explanation: Option A is correct because alpha particles have high ionization power but low penetrating power.
Correct answer: γ-rays- A. Decrease as the age of atoms increase
- B. Increase as the age of atoms increase
- C. Is independent of the age
- D. Depends on the nature of activity
Explanation: The decay constant is a property of the radioactive material itself, and it does not change over time.
Correct answer: Is independent of the age- A. 90/144
- B. 91/144
- C. 91/143
- D. 90/143
Explanation: Proton number of Thorium = 90 Neutron number of Thorium = 243 - 90 = 143 β-particle =-1β0 After the emission of β particle: Proton number…
Correct answer: 91/143- A. Alpha
- B. Gamma
- C. Beta
- D. Cathode rays
Explanation: Gamma rays are electromagnetic waves and are neutral. The presence of an electric field does not affect their path of motion and they…
Correct answer: Gamma- A. α
- B. γ
- C. β
- D. Neutron
Explanation: The explanation is given below: In the context of nuclear physics, when a nucleus emits radiation without any change in its mass number…
Correct answer: γ- A. α
- B. γ
- C. β
- D. 1 α and 2 β
Explanation: The explanation is given below: When an atom emits radiation, and the daughter nucleus is an isotope of the parent nucleus, this typically…
Correct answer: 1 α and 2 β- A. K-shell electron
- B. The decay of neutron
- C. Pre existing electron in nucleus
- D. The decay of proton
Explanation: The explanation is given below: Beta (β) particles in radioactivity originate from the decay of certain types of atomic nuclei.
Correct answer: The decay of neutron- A. Stable
- B. Unstable
- C. Small
- D. None
Explanation: Correct. Elements with atomic number Z > 82 are typically unstable and undergo radioactive decay.In summary, the correct option is **b.
Correct answer: Unstable- A. 1: 16
- B. 16: 1
- C. 1: 8
- D. 8: 1
Explanation: To solve this problem, we need to determine the number of half-lives that have passed for each element within the given time frame.
Correct answer: 1: 16- A. Photons
- B. Leptons
- C. Bosons
- D. Hadrons
Explanation: The particles that experience the strong nuclear force are hadrons. The strong nuclear force is a short-range but extremely powerful force…
Correct answer: Hadrons- A. 1.66 x 10^-27kg
- B. 602 x 10^-27 Kg
- C. 6.02 x 10^-23Kg
- D. 2.67 x 10^-23kg
Explanation: The mass equivalent of 931 MeV of energy can be calculated using Einstein's mass-energy equivalence formula E = mc2 where ( E ) is energy…
Correct answer: 1.66 x 10^-27kg- A. Negligible
- B. Same
- C. Greater
- D. Smaller
Explanation: The sum of the masses of the constituent nucleons (protons and neutrons) is actually greater than the mass of the resultant nucleus.
Correct answer: Greater