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 39 of 63
- A. 6
- B. 8
- C. 14
- D. 20
Explanation: .If the atomic number (Z) of element X is 14 and the mass number (A) is 6, we can determine the number of neutrons using the…
Correct answer: 8- A. Nuclear process does not depend on external factors
- B. Increased on applied pressure
- C. Exothermic change which increases and decreases with temperature
- D. None of these options are correct
Explanation: The phenomenon of radioactivity is nuclear process does not depend upon the external factors.
Correct answer: Nuclear process does not depend on external factors- A. Reducing the neutron speed
- B. Increasing the neutrons speed
- C. Increasing the electron speed
- D. Decreasing the electron
Explanation: Option A is correct since the neutron speed is reduced so that more neutrons are being absorbed by moving down into the reactor.
Correct answer: Reducing the neutron speed- A. Radioactive nucleus
- B. Innermost electron orbit
- C. A stable nucleus
- D. Outermost electron orbit
Explanation: This is an understood fact that all radioactive emissions occur from a radioactive nucleus.
Correct answer: Radioactive nucleus- A. Fast moving electron
- B. Slow moving electron
- C. Electron at rest
- D. None of these options are correct
Explanation: A beta particle is actually a fast moving electron. It is emitted from the nucleus of an atom during radioactive decay.
Correct answer: Fast moving electron- A. Oxygen
- B. Hydrogen
- C. Chlorine
- D. None of these options are correct
Explanation: Ozone is not an isotope of any element. Isotopes are atoms of the same element that have different numbers of neutrons.
Correct answer: None of these options are correct- A. Infinite
- B. Zero
- C. Negative
- D. Still not found
Explanation: The angular momentum of a photon can be zero.The angular momentum of a photon is quantized, which means that it can only have discrete…
Correct answer: Zero- A. 12g
- B. 6g
- C. 2g
- D. 8g
Explanation: The initial mass which was 24 g reduced to 3 g, which is ⅛ of the total mass.
Correct answer: 12g- A. Protons
- B. Neutrons
- C. Electrons
- D. Atoms
Explanation: Isotopes are atoms of the same element having different number of neutrons in their nuclei. Hence Option B is correct.
Correct answer: Neutrons- A. Distance
- B. Mass
- C. Time
- D. None of these options are correct
Explanation: Atomic mass unit is a unit of mass. Hence Option B is correct.
Correct answer: Mass771. Which of the following substances cannot be emitted by radioactive substances during their decay?
- A. Protons
- B. Neutrinos
- C. Helium nuclei
- D. Electrons
Explanation: Protons can never be emitted from a radioactive nucleus. Hence Option A is correct.
Correct answer: Protons- A. Attract
- B. Repel
- C. No effect
- D. Annihilate
Explanation: Both are matter therefore no annihilation will take place. Both have opposite charges therefore will attract each other.
Correct answer: Attract- A. Beta
- B. Gamma
- C. He-Ne laser
- D. None of these options are correct
Explanation: Alpha particles have the highest ionising power which is not in options A, B, and C. Hence Option D is correct.
Correct answer: None of these options are correct- A. Finite
- B. Infinite
- C. Very short
- D. Zero
Explanation: The decay curve of a radioactive sample is exponential i.e. it tends towards zero but never reaches zero.
Correct answer: Infinite- A. Infrared rays
- B. UV rays
- C. All of these
- D. Gamma rays
Explanation: The Sun emits radiation right across the electromagnetic spectrum, from extremely high-energy X-rays to ultra-long-wavelength radio waves…
Correct answer: All of these- A. -2/3 e
- B. +2/3 e
- C. +1/3 e
- D. -1/3 e
Explanation: Each up quark has a charge of +2/3. Each down quark has a charge of -1/3.
Correct answer: +2/3 e- A. Air
- B. Paper
- C. Lead
- D. Cloth
Explanation: X rays are absorbed the most by lead, thus it is usually used in protective suits against gamma rays and x rays.
Correct answer: Lead- A. 4/9
- B. +1/9
- C. -1/9
- D. -2
Explanation: The charge on one down quark is -1/3.Product of the charges on two down quarks would be:-1/3 x -1/3 = + 1/9
Correct answer: +1/9- A. Z - 6, A - 12
- B. Z - 2, A - 4
- C. Z + 1, A
- D. Z + 3, A
Explanation: Z + 1, A: This option suggests that the electron is emitted from the electron cloud, resulting in a change in the atomic number (Z) but no…
Correct answer: Z + 1, A- A. x = t + 4
- B. x = t - 4
- C. x - 3 = t
- D. x - 1 = t
Explanation: x-4 = tx = t + 4x = t + 4: This option suggests that the initial nuclide with mass number 'x' decays by β-emission and α-emission…
Correct answer: x = t + 4