Free Composition of Atomic Nuclei MCQs with Answers
100 Composition of Atomic Nuclei 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 positively charged protons and electrically neutral neutrons, collectively called nucleons. Questions use atomic number, mass number and nuclear notation to identify isotopes, isobars and isotones, and may connect nuclear composition with nuclear charge, mass defect, binding energy and the stability of the nucleus.
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100 questions · page 5 of 5
- A. Electrons
- B. Protons
- C. Phonons
- D. Photons
Explanation: A nuclear reactor is a device in which nuclear reactions are initiated,maintained,and controlled.It works on the principle of controlled…
Correct answer: Protons- A. Slowing down fast neutrons
- B. Speeding up slow neutrons
- C. Absorbing fast neutrons
- D. Regulating the power evel of the reactor
Explanation: Cadmium rods are used in a nuclear reactor for absorbing fast neutrons.
Correct answer: Absorbing fast neutrons- A. Atomic number and actual mass remain unchanged
- B. atomic number and actual mass both decrease
- C. atomic number and actual mass both increase
- D. atomic number remains the same but the actual mass decrease
Explanation: Radioactivity is the phenomena in which an unstable nuclei emits alpha particle, beta particle or gamma ray in order to achieve stability.
Correct answer: Atomic number and actual mass remain unchanged- A. Alpha particles
- B. Photons
- C. Protons
- D. Atoms
Explanation: Neurons can be slowed down if they collide with stationary protons. This process is called neutron moderation, and it involves…
Correct answer: Protons- A. Excitation energy
- B. Ionization energy
- C. Binding energy
- D. Work function
Explanation: Binding energy is the amount of energy required to break a nucleus into its nucleons (protons and neutrons).
Correct answer: Binding energy- A. fast neutrons
- B. slow neutrons
- C. thermal neutrons
- D. all of these
Explanation: Fission occurs when a neutron bumps into a larger atom, forcing it to excite and split into two smaller atoms, known as fission products.
Correct answer: fast neutrons- A. EB = fh
- B. EB = [(ZMP + N Mn) - ZMA] C2
- C. EB = ZMP C2 + N Mn ZMA C2
- D. EB = ZMP + N Mn - M C2
Explanation: The correct expression for nuclear binding energy is EB = [(ZMP + N Mn) - ZMA] C2.
Correct answer: EB = [(ZMP + N Mn) - ZMA] C2- A. Neutrons
- B. Protons
- C. Electrons
- D. Alpha particles
Explanation: When a nucleus fissions, it splits into several smaller fragments. These fragments, or fission products, are about equal to half the…
Correct answer: Neutrons- A. Neutrinos
- B. Protons
- C. Neutrons
- D. Mesons
Explanation: Neutrinos are subatomic particles that belong to the family of elementary particles known as leptons.
Correct answer: Neutrinos- A. Graphite
- B. Heavy water
- C. Boron rods
- D. Not required
Explanation: No moderator is used in the breeder reactor since fast neutrons are more efficient in transmuting U-238 to Pu-239.
Correct answer: Not required- A. Remove nucleons
- B. Remove an alpha-particle
- C. Remove a B-particle
- D. Separate the nucleus into its constituent nucleons
Explanation: When nuclear reactions occur, there is always a mass defect (products have lower mass than reactants).
Correct answer: Separate the nucleus into its constituent nucleons- A. Hydrogen
- B. Helium
- C. Nucleons
- D. Positrons
Explanation: Nuclear fusion in the sun involves the transformation of hydrogen into helium.
Correct answer: Helium- A. Three quarks
- B. Two quarks
- C. Two quarks and an anti-quark
- D. One quark and one anti-quark
Explanation: Baryons are heavy subatomic particles that are made up of three quarks.
Correct answer: Three quarks- A. C13
- B. N15
- C. F19
- D. O16
Explanation: The correct answer is O16. O16 has an even number of nucleons (8 protons and 8 neutrons), leading to a nuclear spin quantum number of 0.
Correct answer: O16- A. Proton - proton cycle
- B. Carbon- carbon cycle
- C. Co-co cycle
- D. Only A & B
Explanation: So, in the core of the Sun, there are high temperatures and pressures that allow for nuclear fusion to occur.
Correct answer: Only A & B- A. 1.00073
- B. 1.00087
- C. 1.0073
- D. 1.0087
Explanation: The relative atomic mass of a neutron is approximately 1.0073 atomic mass units (amu).
Correct answer: 1.0073- 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: Neutron- 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. An α-particle
- B. An electron
- C. A proton
- D. A neutrino
Explanation: A neutrino carries no electric charge, which is a large part of why it interacts so weakly with matter and is so hard to detect.
Correct answer: A neutrino