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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1061. Which set of radioactive emissions corresponds to the descriptions given in the table heading?
- A. A option
- B. B option
- C. C option
- D. D option
Explanation: α- particles are helium nuclei.β-particles are electrons.γ-particles are photons.
Correct answer: C option- A. 7632As
- B. 7832As
- C. 7831As
- D. 7731As
Explanation: According to the equation:7732Ge → 7733As + 0-1e
Correct answer: 7731As- A. 1 hour
- B. 1 day
- C. 1 week
- D. 1 month
Explanation: Decay constant, λ = 10-6 s-1.The half-life T1/2 is thus given by:
Correct answer: 1 week- A. Between 0 mm and 5 mm
- B. Between 5 mm and 200 mm
- C. Between 200 mm and 500 mm
- D. Between 500 mm to 1000 mm
Explanation: By definition, range of α-particles is 5 mm to 200 mm. This range is more realistic for the maximum range of α-particles in air…
Correct answer: Between 5 mm and 200 mm- A. 1μ Ci
- B. 0.5μ Ci
- C. 4μ Ci
- D. 8μ Ci
Explanation: After first half-life, the activity would become 4 μ Ci.After second half-life, the activity would become 2 μ Ci.So, initially it had an…
Correct answer: 8μ Ci- A. J.J Thomson
- B. Chadwick
- C. Rutherford
- D. Neil Bohr
Explanation: Sir James Chadwick is the correct answer. He discovered the neutron in 1932, which is a subatomic particle with no charge.
Correct answer: Chadwick- A. Electron
- B. Proton
- C. Neutron
- D. Photon
Explanation: Neutrons are uncharged subatomic particles found in the nucleus of atoms.
Correct answer: Neutron- A. 1.6 x 10^-19 J
- B. 1.6 x 10^19 J
- C. 931 MeV
- D. 9.31 MeV
Explanation: Atomic mass unit (a.m.u.) is a unit of mass used to express mass of atomic particles.One atomic mass unit (1 a.m.u.) is defined as one…
Correct answer: 931 MeV- A. 92
- B. 143
- C. 235
- D. 327
Explanation: Atomic number=92Mass number=235No. of neutrons= Mass number − Atomic number=235−92=143
Correct answer: 143- A. 42He
- B. 5626Fe
- C. 14156Ba
- D. 23592U
Explanation: Iron is known for having a high binding energy per nucleon, making it one of the most stable nuclei.
Correct answer: 5626Fe1071. Curie is the unit of:
- A. Energy
- B. Intensity
- C. Radioactivity
- D. Half-life
Explanation: The Curie (symbol Ci) is a non-SI unit of radioactivity originally defined in 1910.
Correct answer: Radioactivity- A. α-rays
- B. β-rays
- C. γ-rays
- D. X-rays
Explanation: Alpha particles have the highest ionization power of the three main types of ionizing radiation: alpha, beta, and gamma.
Correct answer: α-rays- A. Equal to 82
- B. Less than 82
- C. Greater than 82
- D. Does not depend upon number
Explanation: A radioactive element will decay when its atomic number is greater than 82.
Correct answer: Greater than 82- A. Increased by 1
- B. Decreased by 1
- C. Increased by 2
- D. Remain the same
Explanation: When a radioactive element emits a beta particle, the mass number of the atom will remain the same.
Correct answer: Remain the same- A. ms
- B. m
- C. m-1
- D. s-1
Explanation: The correct option is s-1, which stands for "per second." The unit of decay constant (λ) is measured in s-1 because it represents the…
Correct answer: s-1- A. 0.85 MeV
- B. 28 MeV
- C. 150 MeV
- D. 200 MeV
Explanation: The energy released per fission reaction is about 200 million electron Volts (MeV). This is equivalent to about 3.2 × 10-11 Joules.
Correct answer: 200 MeV- A. Ice
- B. Heavy water
- C. Boron rods
- D. Cadmium rods
Explanation: A moderator is a substance used in a nuclear reactor to slow down the neutrons so that they can be more easily captured by the fuel.
Correct answer: Heavy water- A. 0.85 MeV
- B. 28 MeV
- C. 200 MeV
- D. 400 MeV
Explanation: The energy released in a fusion reaction depends on the specific reaction, but the most common fusion reactions release between 14 and 28…
Correct answer: 28 MeV- A. 2
- B. 2.5
- C. 3
- D. 3.5
Explanation: The average number of neutrons emitted per fission is 2.5. This means that for every fission event, there are 2.5 neutrons released on…
Correct answer: 2.5- A. Strong nuclear force
- B. Weak nuclear force
- C. Electromagnetic force
- D. Gravitational force
Explanation: While gravity affects all objects with mass, it's incredibly weak compared to the other three forces, especially at the scales of…
Correct answer: Gravitational force