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 62 of 63
- A. Neutron
- B. Proton
- C. Electron
- D. Positron
Explanation: When one up quark and two down quarks combine, they form a neutron. Neutrons are subatomic particles that are found in the nucleus of…
Correct answer: Neutron1222. Sum of the masses of constituent nucleons as compared to the mass of the resultant nucleus is:
- A. Smaller
- B. Greater
- C. Same
- D. Infinite
Explanation: The mass of the resultant nucleus is indeed smaller than the sum of the masses of its constituent nucleons.
Correct answer: Greater- A. Proton
- B. Neutrino
- C. Photon
- D. Pion
Explanation: A boson is a type of elementary particle that obeys Bose-Einstein statistics. Photons are examples of bosons.
Correct answer: Photon- A. Log2
- B. 1/log λ
- C. 1/λ
- D. (Log2)-1
Explanation: We have to remember formulaMean life = 1/lambda Half life = log2 / lambda =log2 × 1/lambdaReplacing 1/lambda by mean life,Half life = log2…
Correct answer: (Log2)-1- A. 0.1
- B. 0.2
- C. 0.3
- D. 2.3
Explanation: T1/2 = 0.693/λ.Where T1/2= half life and λ= decay constant When half life= 2.3 daysSo λ = 0.693/T1/2= 0.693/2.3=0.30 per day
Correct answer: 0.3- A. 22 years
- B. 88 years
- C. 11 years
- D. 44 years
Explanation: The correct answer is 44 years because the half-life of a sample is defined as the time required for half of the sample to decay.
Correct answer: 44 years- A. N0/8
- B. 2N0/3
- C. N0/3
- D. 7N0/8
Explanation: Each half-life reduces the remaining number of nuclei by half. After one half-life, N0/2 nuclei remain.
Correct answer: 7N0/8- A. X/32
- B. X/13
- C. X/8
- D. X/5
Explanation: Half life is 2.6 yearsInitially x grams of sodium isotope were present After 13 years which is 13/2.6 = 5 years Let the amount of sodium…
Correct answer: X/32- A. 12 hours
- B. 6 hours
- C. 2 hours
- D. 3 hours
Explanation: Original amount = 16gDecayed amount = 12gradioactive isotope left after 6 hours is, 16 g - 12 g = 4 gUse N = No/2nWhere N = 4g , No =…
Correct answer: 3 hours- A. Lead
- B. Steel
- C. Iron
- D. Copper
Explanation: Lead is commonly used as a shield against X-rays due to its high density and high atomic number.
Correct answer: Lead- A. Excitation phenomena
- B. Ionization
- C. Photoelectric effect
- D. Heating
- E. All of them
Explanation: The correct answer is All of them.Radiation can harm living organisms through a combination of mechanisms: excitation can cause energy…
Correct answer: All of them- A. Particle property
- B. Cost of X-ray unit is low
- C. High penetrating power
- D. It is not electromagnetic waves
Explanation: X-rays are a type of electromagnetic radiation with high frequency and energy, which grants them significant penetrating power.
Correct answer: High penetrating power- A. A proton
- B. A neutron
- C. An alpha particle
- D. a beta particle
Explanation: Beta decay is a radioactive decay in which a beta ray is emitted from an atomic nucleus.
Correct answer: a beta particle- A. Increase
- B. Remain the same
- C. Decrease
- D. Increase or decrease depending upon the temperature of the substance
Explanation: Radioactivity is always random and spontaneous. Random means one cannot know precisely when the next decay will happen, though one can…
Correct answer: Remain the same- A. 83Bi212
- B. 81Bi210
- C. 85Bi210
- D. None of these
Explanation: When a β-particle, which is an electron, is emitted from the nucleus during beta decay, a neutron is transformed into a proton.
Correct answer: 83Bi212- A. one Becquerel
- B. One curie
- C. One-half life
- D. None of above
Explanation: One becquerel is the quantity of a radioactive element in which there is one atomic disintegration per second.
Correct answer: One curie- A. 92U235
- B. 92U236
- C. 92U238
- D. 92U239
Explanation: 92U235 is the only naturally occurring isotope of uranium that is fissile (able to fission with slow neutrons).
Correct answer: 92U235- A. No charge
- B. Non-material nature
- C. Small size
- D. Lighter particles
Explanation: Gamma rays have higher penetrating power than alpha and beta particles due to their lack of charge.
Correct answer: No charge- A. Cyclotron
- B. Betatron
- C. Accelerator
- D. Nuclear reactor
Explanation: The device in which the controlled fission chain reaction is maintained is called a nuclear reactor.
Correct answer: Nuclear reactor- A. 90Rn^220
- B. 86Rn^222
- C. 89Rn^226
- D. 90Rn^222
Explanation: When an alpha particle is emitted, the mass number of the daughter nucleus will decrease by 4, and the charge number will decrease by 2.
Correct answer: 86Rn^222