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 2 of 5
- A. Isotopes
- B. Isobars
- C. Isotones
- D. Isomers
Explanation: Nuclei with the same mass number A but different atomic numbers Z are called isobars, because they contain the same total number of…
Correct answer: Isobars- A. 1.67 x 10^-31 kg
- B. 1.67 x 10^-27 kg
- C. 9.1 x 10^-31 kg
- D. 1.67 x 10^-19 kg
Explanation: A neutron has a mass of approximately 1.67 x 10^-27 kg. The likely trap is 9.1 x 10^-31 kg, which is the mass of an electron, while 1.67 x…
Correct answer: 1.67 x 10^-27 kg- A. Antiproton
- B. Positron
- C. Gamma rays
- D. Photon
Explanation: A positron is the antiparticle of the electron, so it has the electron's mass, 9.1 x 10^-31 kg, but the proton's positive charge, +1.6 x…
Correct answer: Positron- A. Plus 1.6 x 10^-19C
- B. Zero
- C. Minus 1.6 x 10^-19C
- D. No definite charge
Explanation: A neutron is electrically neutral, so its charge is 0 C. The likely mistake is choosing +1.6 x 10^-19 C or -1.6 x 10^-19 C, which are the…
Correct answer: Zero- A. Ampere
- B. Maxwell
- C. Millikan
- D. Thomson
Explanation: Millikan measured the elementary charge using the oil-drop experiment, finding its magnitude to be about 1.6 x 10^-19 C.
Correct answer: Millikan- A. Binding energy per nucleon
- B. Energy of decay
- C. Destruction energy
- D. All of above
Explanation: Binding energy per nucleon is the average energy needed to remove one nucleon from a nucleus, calculated as total binding energy divided…
Correct answer: Binding energy per nucleon- A. 10-12m
- B. 10-11m
- C. 10-10m
- D. 10-14m
Explanation: An atom has a diameter of roughly 10^-10 m, based on the typical scale of its electron cloud.
Correct answer: 10-10m- A. Neutron
- B. Proton
- C. Electron
- D. Positron
Explanation: When nitrogen-14 is bombarded with an alpha particle, the reaction can be written as 14N + 4He -> 17O + 1H, so a proton is emitted.
Correct answer: Proton- A. The binding energy of the nucleus
- B. Packing fraction
- C. The average energy of the nucleus
- D. All of above are one and the same thing
Explanation: Mass defect per nucleon is commonly expressed through the packing fraction, which represents the mass defect relative to the mass number.
Correct answer: Packing fraction- A. Proton-proton
- B. Proton-neutron
- C. Neutron-neutron
- D. All of the above
Explanation: The strong nuclear force acts between all pairs of nucleons, including proton-proton, proton-neutron and neutron-neutron pairs.
Correct answer: All of the above- A. Greater than 72
- B. Greater than 82
- C. Greater than 92
- D. Greater than 102
Explanation: Transuranic elements are elements beyond uranium in the periodic table, so their atomic number is greater than 92.
Correct answer: Greater than 92- A. 200MeV
- B. 40MeV
- C. 30MeV
- D. 20MeV
Explanation: Fission of one uranium-235 nucleus releases approximately 200 MeV, which is 200 x 1.602 x 10^-13 J = 3.20 x 10^-11 J per nucleus.
Correct answer: 200MeV- A. Nucleon
- B. Meson
- C. Boson
- D. Quartz
Explanation: Protons and neutrons are collectively called nucleons because both are particles found in the atomic nucleus.
Correct answer: Nucleon- A. Antiproton
- B. Antineutron
- C. Positron
- D. All of above
Explanation: Antimatter is made of antiparticles, including antiprotons, antineutrons and positrons, each corresponding to an ordinary particle with…
Correct answer: All of above- A. 92
- B. 235
- C. 143
- D. Different for different isotopes
Explanation: The number of neutrons is the mass number minus the atomic number, and uranium isotopes have different mass numbers while all uranium…
Correct answer: Different for different isotopes36. The__________branch of Physics deals with nuclear particles such as neutrons, protons and nuclear?
- A. Solid State Physics
- B. Plasma Physics
- C. structure is called
- D. Nuclear Physics
- E. Particle Physics
Explanation: Nuclear physics studies atomic nuclei and their constituents, including protons and neutrons, as well as nuclear reactions and forces.
Correct answer: Nuclear Physics- A. Uranium
- B. Hydrogen
- C. Oxygen
- D. Nitrogen
Explanation: Option A) A centrifuge relies on the principles of centripetal force accelerating molecules so that the particles of different masses are…
Correct answer: Uranium- A. Strong force
- B. Weak force
- C. Electromagnetic force
- D. All of these options are correct
Explanation: Option A) Nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons.
Correct answer: Strong force- A. protons
- B. neutrons
- C. electrons
- D. atom
Explanation: Isotopes are elements with the same proton and electron number but different neutrons so option B is correct.
Correct answer: neutrons- A. Fission
- B. Fusion
- C. Alpha-decay
- D. A chain reaction
Explanation: Fission occurs when a neutron slams into a larger atom, forcing it to excite and split into two smaller atoms-also known as fission…
Correct answer: Fission