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 38 of 63
- A. Meter
- B. Second
- C. Henry
- D. None of these
Explanation: The absorption power has no unit. It equals the amount of energy absorbed divided by the amount of energy incident.
Correct answer: None of these- A. 1/512
- B. 1/1024
- C. 1/256
- D. 1/2048
Explanation: As; remaining = ½^nWhere n is the number of half lives passedSo; ½^10 = 1/ 1024
Correct answer: 1/1024- A. 0.69 min
- B. 2 min
- C. 2.57 min
- D. 2.31 min
Explanation: Given: Mean time = t = 200s Half-1/2 = ?Solution:As we know that: T1/2 = 0.693 × t = 0.693 × 200s = 138.6 / 60 min T1/2 = 2.31 minutes
Correct answer: 2.31 min- A. 40 year, 0.9173/year
- B. 80 year, 0.0173 year
- C. 90 year, 9.017/year
- D. None of these options is correct
Explanation: The radioactive substance will reduce to ¼ of its original value in 2 half lives.
Correct answer: 80 year, 0.0173 year- A. 2400 years
- B. 3200 years
- C. 6400 years
- D. 4800 years
Explanation: 50 g of radium will remain unchanged after 1 half life and 25 g of radium will remain unchanged after 2 half lives.
Correct answer: 3200 years- A. Th234
- B. Po234
- C. Rn234
- D. None of these
Explanation: Option A is correct since Uranium-238 undergoes alpha decay to become Thorium-234.
Correct answer: Th234- A. H+
- B. C+
- C. Na+
- D. He+
Explanation: Option D is correct since an alpha particle is obtained by removing 2 electrons from a helium atom.
Correct answer: He+- A. Daughter element
- B. Modified element
- C. Radioactive element
- D. All of these
Explanation: a) Daughter element: This option suggests that when a radioactive element decays to its first half-life, the new element formed is called…
Correct answer: Daughter element- A. 1+
- B. 1-
- C. 0
- D. None of these options are correct
Explanation: Option C is correct since 'Gamma rays' have no charge so are unaffected by magnetic and electric fields.
Correct answer: 0- A. Th-234
- B. Po-234
- C. Rn-234
- D. None of these
Explanation: The decay equation of Uranium-238 is as follows;U-238→He-4+Th-234
Correct answer: Th-234- A. 1+
- B. 1-
- C. 0
- D. None of these
Explanation: The high penetrating power and long range of gamma rays are both a product of the lack of a charge on them.
Correct answer: 0- A. H
- B. O
- C. Cl
- D. None of these
Explanation: Correct Option:AThis option is correct because hydrogen is the element in the isotopes.
Correct answer: H- A. R=roA-1/3
- B. R=roA1/3
- C. R=roA3
- D. None of these
Explanation: Correct Option: BThe radius of a nucleus can be approximated by the formula R = roA^(1/3), where ro is a constant and A represents the…
Correct answer: R=roA1/3- A. Remains same
- B. Increase slightly
- C. Decreases slightly
- D. It will pass the nucleus
Explanation: Correct option: BThis option is correct because when a nucleus absorbs a photon its energy is increased and becomes excited.
Correct answer: Increase slightly- A. 1/6
- B. 3/2
- C. 5/6
- D. 1/2
Explanation: Correct Option: C This option is correct because after one half-life. N°/2 sample remains and N/2 decays After three half-lives, N°/6…
Correct answer: 5/6- A. Multiple wavelength
- B. Double wavelength
- C. Single wavelength
- D. Coherent photons
Explanation: Correct Option: CThis option is correct because it correctly defines coherent sources as the sources of light which emit light of the same…
Correct answer: Single wavelength757. 1 Curie is equal to:
- A. 1 MBq
- B. 37 MBq
- C. 37 GBq
- D. 3.7 GBq
Explanation: Correct Option :CIt's a fact that 1 Curie 37 GBq.A Curie (Ci) is a unit of measurement for radioactivity.
Correct answer: 37 GBq- A. Curie
- B. Rutherford
- C. Rontgen
- D. Rad
Explanation: Correct Option:AThe unit of measurement for radioactive decay rate is called the Curie (Ci).
Correct answer: Curie- A. Mass
- B. Charge
- C. Time
- D. Area
Explanation: Correct Option:AThe absorbed dose, denoted by the symbol D, is a measure of the energy absorbed from ionizing radiation per unit mass of…
Correct answer: Mass- A. -1/2
- B. +1/2
- C. -1/3
- D. +2/3
Explanation: The down quark has a charge of -1/3.Quarks are elementary particles that are the fundamental building blocks of matter.
Correct answer: -1/3