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 45 of 63
- A. 0%
- B. 12.5%
- C. 50%
- D. 75%
Explanation: To solve the question, we first determine how many half-lives have passed in 90 years.
Correct answer: 12.5%- A. 0.469 min
- B. 32 min
- C. 15 min
- D. 3 min
Explanation: The correct answer is 3 minutes. To determine this, we first need to understand the relationship between the half-life and the remaining…
Correct answer: 3 min- A. Equal to the sum of the masses of its constituent protons and neutrons
- B. Less than the sum of the masses of its constituent protons and neutrons
- C. Greater than the sum of the masses of its constituent protons and neutrons
- D. Unpredictable and varies depending on the nucleus
Explanation: This is the correct answer. The difference between the sum of the individual masses and the actual mass of the nucleus is known as the…
Correct answer: Less than the sum of the masses of its constituent protons and neutrons- A. Radioactivity
- B. Fission
- C. Fusion
- D. None of the above
Explanation: This is the correct answer. Radioactivity is the spontaneous emission of radiation from the nucleus of an unstable atom.
Correct answer: Radioactivity- A. Radioactivity
- B. Fluorescence
- C. Phosphorescence
- D. Luminescence
Explanation: Radioactivity is the spontaneous emission of radiation from the nuclei of unstable atoms.
Correct answer: Radioactivity- A. 15 hrs
- B. 16 hrs
- C. 900 s
- D. 3600 s
Explanation: The half-life (t1/2) of a substance is related to its decay constant (λ) by the following equation:t1/2 = ln(2) / λwhere:ln(2) = natural…
Correct answer: 15 hrs- A. (7/8) min
- B. (8/7) min
- C. (7/4) min
- D. (7/2) min
Explanation: N(t) = No × (1/2)^(t/T)N(t) = remaining amount after time tNo = initial amountt = time elapsed (14 min)T = half-life (unknown)Given:N(t) =…
Correct answer: (7/2) min- A. 16 J
- B. 32 J
- C. 48 J
- D. 64 J
Explanation: Explanation:Equivalent dose (rem) = RBE factor × Absorbed dose (rad) Absorbed dose (rad) = Equivalent dose (rem) / RBE factor = 400 rem /…
Correct answer: 32 J889. When a nucleus emits beta particle, its mass number remains constant but charge number increases by:
- A. 2
- B. 3
- C. 4
- D. 1
Explanation: Explanation: Beta decay involves the transformation of a neutron into a proton (or vice versa).
Correct answer: 1890. According to the law of radioactive decay, the rate of disintegration is directly proportional to:
- A. Pressure
- B. Density of substance
- C. Volume of substance
- D. Number of atoms present
- E. Temperature
Explanation: According to law of radioactive decay, the rate of disintegration is direct proportional to number of atoms present.
Correct answer: Number of atoms present- A. (0.693)2/λ
- B. T = (0.693)
- C. (0.693) x λ
- D. T =√0.693/λ
- E. 0.693/λ
Explanation: Half-life of a radioactive sample is given by: 0.693/λAs it is numerical only one option E is correct
Correct answer: 0.693/λ- A. Proton
- B. alpha-particle
- C. Electron
- D. Position
- E. Neutron
Explanation: Adding the atomic numbers on reactant side the answer should be 9. Since oxygen has atomic number 8.
Correct answer: Proton- A. Alpha
- B. Beta
- C. Gamma
- D. Alpha, Beta, Gamma
Explanation: When a β-particle is emitted out of any nucleus, then its mass number does not change but its charge number is increases by one.
Correct answer: Beta- A. 0.000022 s
- B. 45000 /s
- C. 0.000022 / s
- D. 0.000032 / s
Explanation: The decay constant (λ) can be calculated using the formula: λ = 0.693 / t1/2 In this case, the half-life of strontium is given as 8.70…
Correct answer: 0.000022 / s- A. Whole life of sample
- B. Disintegration time for half of the atoms
- C. Decay only
- D. Total time for stable atoms
Explanation: The radioactive half-life for a given radioisotope is the time for half the radioactive nuclei in any sample to undergo radioactive decay.
Correct answer: Disintegration time for half of the atoms- A. Infrared
- B. Ultraviolet
- C. X-rays
- D. Gamma rays
Explanation: In an electronic transition of atom it only emits ultraviolet, visible and infrared rays and if transitions are from heavier atoms X-ray…
Correct answer: Gamma rays- A. Initial number of atoms
- B. Temperature
- C. Nature of material
- D. Time
Explanation: Radioactivity is a process of spontaneous disintegration or breaking of unstable atomic nuclei by the emission of radiation like α−ray or…
Correct answer: Temperature- A. Bq
- B. Ci
- C. Decay/second
- D. tesla/m2
Explanation: Tesla m2 is the unit of magnetic flux .tesla/m2 is not the unit of any physical quantity.
Correct answer: tesla/m2- A. Radioactivity
- B. Temperature
- C. Half life
- D. Transition of magnetism
Explanation: Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability.This was discovered by Henri…
Correct answer: Radioactivity- A. Lead
- B. Plutonium
- C. Radium
- D. Protactinium
Explanation: Stability means that the given atom or molecule is stable and exists like this only in nature.
Correct answer: Lead