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 52 of 63
- A. Y = X - 4
- B. Y =X - 1
- C. Y =X + 1
- D. Y = X
Explanation: According to the given statement, this option is correct. The equation can be written as:AZX → AZ+1Y + 0-1e + γ
Correct answer: Y = X- A. Increases by 1
- B. Decreases by 1
- C. Increases by 2
- D. No change
Explanation: Gamma radiations are released by excited nuclei, no other charges are released.
Correct answer: No change- A. Can be increased by magnetic field
- B. Can be decreased by the magnetic fields
- C. Can be kept constant by the electric field
- D. Is not affected by electric and magnetic fields
Explanation: Radioactivity is a spontaneous, random and natural phenomenon. So, it is not affected by electric and magnetic fields.
Correct answer: Is not affected by electric and magnetic fields- A. 6α, 3β
- B. 6α, 4β
- C. 4α, 3β
- D. 3α, 4β
Explanation: 3 alpha emissions and 4 beta emissions have occurred.
Correct answer: 3α, 4β- A. 40%
- B. 50%
- C. 65.6%
- D. 34.4%
Explanation: Given:10% decays every 5 years → 90% remains after each 5 years.Time = 20 years → number of 5-year periods = 20 / 5 = 4.Step 1: Find…
Correct answer: 34.4%- A. + (A - Z)e
- B. +(Z)e
- C. + Z - A.e
- D. +A.e
Explanation: Charge on nucleus = Z(+e)Neutrons are neutral thus charge is due to protons which equals to proton number.
Correct answer: +(Z)e- A. Charge of the particle
- B. Mass of the particle
- C. Energy of the particle
- D. All of these
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: All of these- A. Protons and neutrons have exactly same mass.
- B. Gamma rays are higher energy neutrons.
- C. α-particles are single ionized helium neutrons.
- D. β-rays are same as cathode rays.
Explanation: β-particles are the fast moving electrons (cathode rays) which come out of the nucleus of a radioactive element.
Correct answer: β-rays are same as cathode rays.- A. Isotopes of each other
- B. Isotones of each other
- C. Isobars of each other
- D. All of these
Explanation: Atoms having same atomic mass but different atomic number are called isobars.
Correct answer: Isobars of each other- A. 16 hours
- B. 8 hours
- C. 4 hours
- D. 2 hours
Explanation: 15/16 of a radioactive atoms will decay in four half-lives.4T1/2= 16 hoursT1/2= 4 hours
Correct answer: 4 hours- A. Positron emission
- B. β-decay
- C. α-decay
- D. Nuclear fusion
Explanation: Fusion is a nuclear reaction in which two light nuclei merge to form a heavy nucleus.
Correct answer: Nuclear fusion- A. Z - 2, A - 4
- B. Z - 1, A - 4
- C. Z - 32, A - 4
- D. Z, A - Z
Explanation: The equation is given below:AZX → A-4Z-1Y + 42α + 0-1β
Correct answer: Z - 1, A - 4- A. 218S84
- B. 216S84
- C. 212S82
- D. 216S82
Explanation: After 2 alpha and 2 beta emissions, atomic number reduces by 2 and mass number decreases by 8.
Correct answer: 212S82- A. 90 counts per minute
- B. 40 counts per minute
- C. 120 counts per minute
- D. 45 counts per minute
Explanation: The calculations give us 40 counts per minute.
Correct answer: 40 counts per minute- A. γ-rays
- B. Electrons
- C. Protons
- D. 42He
Explanation: In natural radioactivity α, β and γ radiations are emitted. These are the only three nuclear radiations.
Correct answer: Protons- A. Production of radio waves
- B. Transmissions of radio waves
- C. Reception of radio waves
- D. Decay of atomic nucleus
Explanation: Radioactivity is the phenomenon in which nucleus is disintegrated (decay).
Correct answer: Decay of atomic nucleus- A. Neutron
- B. Meson
- C. α-particle
- D. Deuteron
Explanation: It would transform into He-4 nucleus.31H + 11H → 42He
Correct answer: α-particle- A. Maximum for α-rays
- B. Maximum for β-rays
- C. Maximum for γ-rays
- D. Zero for all of them
Explanation: As the work is done by magnetic field so, according to work energy principle, the energy gained will be zero for all of them.
Correct answer: Zero for all of them- A. Increasing temperature
- B. Changing volume
- C. Increasing pressure
- D. Can't be increased
Explanation: Radioactivity is a spontaneous, random and natural phenomenon So, it cannot be increased.
Correct answer: Can't be increased- A. Y-1XQ
- B. YX-1Q
- C. YX+1Q
- D. Y-1X+1Q
Explanation: Isotopes of an element have same number of protons but different number of neutrons.
Correct answer: Y-1XQ