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 51 of 63
- A. Smaller ionization power
- B. Same ionization power
- C. Energy is not conserved
- D. Neither greater nor smaller ionization power
Explanation: The range of the β-particle is 100 times more than that of α-particles.
Correct answer: Smaller ionization power- A. Trajectory
- B. Firing level
- C. Range
- D. Limit
Explanation: An α-particle travels a well defined distance in a medium before coming to rest. This distance is called the range of the particle.
Correct answer: Range- A. Zinc Sulphide
- B. Sodium Iodide
- C. Barium Palatino Cyanide
- D. All of above
Explanation: Charged particles α or β and γ-radiation produce fluorescence or glow on striking some substance like zinc sulfide, sodium iodide, or…
Correct answer: All of above- A. 10 times more
- B. 100 times less
- C. 100 times more
- D. 10 times less
Explanation: The range of the β-particle is 100 times more than that of α-particles.
Correct answer: 100 times more- A. 25%
- B. 7.5%
- C. 50%
- D. 15%
Explanation: No. of half-lives = t/T1/2 = 15/ 7.5 = 2No. of atoms of isotopes remaining after 2 half-lives = (1/22)No= 25% of No
Correct answer: 25%- A. A option
- B. B option
- C. C option
- D. D option
Explanation: After two α-emissions, the values for nuclide S would be:Atomic number (Z): 86 - (2 * 2) = 86 - 4 = 82Mass number (A): 220 - (2 * 4) = 220…
Correct answer: C option- A. High-frequency particles
- B. Moderate frequency particles
- C. Low-frequency particle
- D. Visible light
Explanation: Fluorescence is the property of absorbing radiant energy of high frequency and re-emitting energy of low frequency in the visible region…
Correct answer: Visible light- A. Loses by 1
- B. No change will be observed
- C. Increases by 1
- D. Increases by 2
Explanation: The emission of a β-particle (either electron or positron) results in a change of charge by one unit.
Correct answer: Increases by 1- A. The rate of disintegration is directly proportional to the number of atoms present in the sample at that instant.
- B. Equal fractions disintegrate in equal intervals of time.
- C. A radioactive sample takes an infinite time to disintegrate.
- D. All of the above.
Explanation: The number of atoms decaying in a particular period is proportional to the number of atoms present at the beginning of the period If the…
Correct answer: The rate of disintegration is directly proportional to the number of atoms present in the sample at that instant.- A. N
- B. N/4
- C. N/2
- D. 3N/4
Explanation: No. of un-decayed nuclei after 2 half-lives =1/22 N = 1/4 N
Correct answer: N/4- A. 2.5 mg
- B. 0.625 mg
- C. 1.25 mg
- D. 0.3125 mg
Explanation: Amount of un-decayed Iodine after 4 half-lives=1/2^4 N= (20)(1/16)= 1.25 mg
Correct answer: 1.25 mg- A. 2.5 days
- B. 15 days
- C. 10 days
- D. 20 days
Explanation: After 2T1/2 the sample decayed = 3/4 Nt= 2T1/2=2(5days) = 10 days
Correct answer: 10 days- A. Mesons
- B. Muons
- C. Baryons
- D. Electrons
Explanation: The particles equal in mass or greater than protons are called baryons.
Correct answer: Baryons- A. They cause ionization in air
- B. They can be deflected by magnetic field
- C. They can be deflected by electric field
- D. They can penetrate a few millimeter of aluminum
Explanation: Ionization is the main interaction with the matter to detect the particle or to detect its energy.
Correct answer: They cause ionization in air- A. A option
- B. B option
- C. C option
- D. D option
Explanation: Equation can be written as:AZX → A-4Z-1Y + 42He + 0-1eThus, there is visible decrease in nucleon number as well as proton number.
Correct answer: D option- A. 0
- B. 1/128
- C. 1/64
- D. 1/32
Explanation: The radioactive element has 1/8 of a given quantity remaining after 12 days.
Correct answer: 1/64- A. λ = ln(2)/T1/2
- B. λ = N/t
- C. λ = dN/dt
- D. λ = A/N
Explanation: The decay constant (λ) is a measure of the probability of decay of a single atom over a unit of time, often expressed as λ = ln(2)/T1/2…
Correct answer: λ = ln(2)/T1/2- A. 22084X
- B. 22286X
- C. 21682X
- D. 21588X
Explanation: According to the equation: 22888Rn → 21682X + 3 42He
Correct answer: 21682X- A. 4Mp
- B. 4Mn
- C. 2 Mp + 2Mn
- D. 2 Me + 2Mp
Explanation: α-particles are Helium nuclei. The charge on them is +2e while their mass is 4 amu that is every α-particle has two protons and two…
Correct answer: 2 Mp + 2Mn- A. α and β
- B. α and two β
- C. Two α and β
- D. α and four β
Explanation: The emission of α-particle (each reducing Z by 2 and A by 4) in addition to two β-particles (which increase Z by 2 without changing A)…
Correct answer: α and two β