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.
Last updated
1,254 questions · page 28 of 63
- A. ɑ radiations
- B. β radiations
- C. ɣ radiations
- D. All of these
Explanation: Radioactive elements don't emit a specific type of radiation only. The most common forms of radiation emitted have been traditionally…
Correct answer: All of these- A. 3%
- B. 10%
- C. 6.25%
- D. 20%
Explanation: After 5 half lives, the fractions of atoms remains is given by,N0/N =(1/2)t/T. Given that t=5T: N0/N =(1/2)5T/T =1/32=3% approximately
Correct answer: 3%- A. Two up quarks and one down quark
- B. Two up quarks and one strange quark
- C. One up quark and two strange quarks
- D. Two down quarks and one up quark
Explanation: Protons and Neutrons are made up of 3 quarks each. An up quark has charge +2/3 whereas a down quark has charge -2/3.
Correct answer: Two up quarks and one down quark- A. When protons and neutrons combine to form nucleus, mass decrease due to gain of energy
- B. Possible mass loss is due to faulty techniques to measure mass of nucleus
- C. This statement is not true in most of the cases
- D. When protons and neutrons combine to form nucleus, some mass is destroyed resulting in energy release
Explanation: When protons and neutrons combine to form nuclei, some mass is destroyed resulting in energy release.
Correct answer: When protons and neutrons combine to form nucleus, some mass is destroyed resulting in energy release- A. 1H1 and 2H1
- B. 12C6 and 13H6
- C. 2H1 and 3H1
- D. 30H15 and 30Si14
Explanation: Isobars are atoms of different elements having the same atomic mass but different atomic numbers.
Correct answer: 30H15 and 30Si14- A. 3%
- B. 10%
- C. 6.25%
- D. 20%
Explanation: After 5 half-lives, the fractions of atoms remaining are given by, N0/N =(1/2)t/T. Given that t=5T: N0/N =(1/2)5T/T =1/32=3% approximately
Correct answer: 3%- A. Water or hydal energy
- B. Geothermal energy
- C. Fossil fuel energy
- D. Nuclear energy
- E. Tidal energy
Explanation: Both fission and fusion are nuclear reactions that produce energy, but the applications are not the same.
Correct answer: Nuclear energy- A. Core
- B. Control rods
- C. Shielding
- D. Moderators
- E. Coolants
Explanation: The heat released by fission in nuclear reactors must be captured and transferred for use in electricity generation.
Correct answer: Coolants- A. 1637 years
- B. 892 years
- C. 10 years
- D. 100 years
- E. 5730 years
Explanation: Carbon-14 has a half-life of 5,730 ± 40 years-i.e. half the amount of the radioisotope present at any given time will undergo spontaneous…
Correct answer: 5730 years- A. 11 Na 12
- B. 19 K 19
- C. 19 K 39
- D. 19 K 20
- E. 12 Na 12
Explanation: The conventional symbol of an element contains the mass number and proton number The mass number of the element shown above(20n+19p=39)…
Correct answer: 19 K 39- A. Less than 5,730 years
- B. Approximately 5,730 years
- C. Significantly greater than 5,730 years, but less than 11,460 years
- D. Approximately 11,460 years
- E. Approximately 15,730 years
Explanation: Because the half-life of carbon-12 is essentially infinite, a 25 percent decrease in the ratio of carbon-14 to carbon-12 means the same as…
Correct answer: Less than 5,730 years552. Sodium nucleus consists of 11 protons and 12 neutrons. The conventional symbol of this nucleus is?
- A. 11Na11
- B. 12Na12
- C. 11Na23
- D. 12Na23
- E. 12Na11
Explanation: The conventional symbol of the element contains the proton number(number of protons) and the mass number(proton number+number of…
Correct answer: 11Na23- A. Simple Analysis
- B. Spectral Analysis
- C. Activation Analysis
- D. Geometric Analysis
- E. Mechanical Analysis
Explanation: Activation analysis (AA) is an analytical method for determining the (stable isotope) concentration of trace elements in the bulk of a…
Correct answer: Activation Analysis- A. Greater than the mass of its constituents
- B. Equal to the mass of its constituents
- C. Less than the mass of its constituents
- D. Far greater than the mass of its constituents
Explanation: As mentioned earlier, the mass of the nucleus is slightly less than the sum of the masses of its individual constituents.
Correct answer: Less than the mass of its constituents- A. Law of radioactive decay
- B. Decay constant
- C. Half life
- D. Decay time
Explanation: Half-life is the time taken for the radioactivity of a specified isotope to fall to half its original value.
Correct answer: Half life- A. Emission Spectra
- B. Nuclear fusion
- C. Nuclear fission
- D. Radioactivity
Explanation: Radioactivity is the spontaneous emission of radiation in the form of particles or high-energy photons resulting from a nuclear reaction.
Correct answer: Radioactivity- A. Remains constant
- B. Decreases by 1
- C. Increases by 1
- D. Decreases by 2
Explanation: On emitting a β particle the number of nucleons in the nucleus (i.e. protons and neutrons) remains same, but the number of neutrons is…
Correct answer: Remains constant- A. Spectroscopy
- B. Radioactivity
- C. Gravimetery
- D. Chromatography
Explanation: Radioactivity is the phenomenon of the spontaneous disintegration of unstable atomic nuclei to atomic nuclei to form more energetically…
Correct answer: Radioactivity- A. X rays
- B. High energy electromagnetic radiations
- C. Electrons emitted from nuclei
- D. Ultraviolet rays
- E. Infrared rays
Explanation: Gamma rays are high-energy electromagnetic radiation emitted by radioactive elements. They possess energy but no mass.
Correct answer: High energy electromagnetic radiations- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The answer to this question can be reached just by finding what P is. P should be a ''particle'', in options having only a photon is the…
Correct answer: Option C