This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Physics Part Ii > Class 12 Physics (Part Ii) Chapter 13 Nuclei – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 13 Nuclei Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If the total binding energies of $_{1}$H$^{2}$, $_{2}$He$^{4}$, $_{26}$Fe$^{56}$, $_{92}$U$^{235}$nuclei are 2.2 MeV, 28.3 MeV, 492 MeV and 1786 MeV respectively, identify the most stable nucleus. A) Hydrogen. B) Iron. C) Helium. D) Uranium. Show Answer Correct Answer: B) Iron. 2. Which process involves the splitting of large nuclei? A) Nuclear fusion. B) Alpha decay. C) Beta decay. D) Nuclear fission. Show Answer Correct Answer: D) Nuclear fission. 3. One milligram of matter converted intoenergy will give A) $9x10^5J$. B) $9x10^3J$. C) $9x10^{10}J$. D) 90 J. Show Answer Correct Answer: C) $9x10^{10}J$. 4. What does the conservation of charge in beta decay imply? A) Total charge decreases. B) Total charge increases. C) Total charge is doubled. D) Total charge remains unchanged. Show Answer Correct Answer: D) Total charge remains unchanged. 5. How do the atomic number and mass number of a nucleus change during alpha decay? A) The atomic number decreases by 4 and the mass number decreases by 2. B) The atomic number decreases by 2 and the mass number decreases by 4. C) The atomic number increases by 1 and the mass number remains constant. D) Neither changes. Show Answer Correct Answer: B) The atomic number decreases by 2 and the mass number decreases by 4. 6. Fusion takes place at high temperature because: A) Atom are ionised at high temperature. B) Molecules break up at high temperature. C) Kinetic energy is high enough to overcome repulsion between nuclei. D) Nuclei break up at high temperature. Show Answer Correct Answer: C) Kinetic energy is high enough to overcome repulsion between nuclei. 7. What is the approximate diameter of a nucleon? A) $1fm$. B) $0.5fm$. C) $1.5fm$. D) $2fm$. E) $3fm$. Show Answer Correct Answer: C) $1.5fm$. 8. Light energy emitted by star is due to: A) Burning of nuclei. B) Joining of nuclei. C) Breaking of nuclei. D) Reflection of solar light. Show Answer Correct Answer: B) Joining of nuclei. 9. If Z represents atomic number and A represents mass number of a nucleus, then charge of the nucleus is (e=magnitude of charge of electron) A) +(A-Z)e. B) +Ae. C) +Ze. D) +(A+Z)e. Show Answer Correct Answer: C) +Ze. 10. Which nucleons electrostatically repel each other? A) Neutrons. B) Protons. C) Electrons. D) Nucleons. Show Answer Correct Answer: B) Protons. 11. What force is responsible for holding the nucleus together? A) Gravitational force. B) Electromagnetic force. C) Weak nuclear force. D) Strong nuclear force. Show Answer Correct Answer: D) Strong nuclear force. 12. What is the strong force responsible for? A) Beta decay. B) Holding protons and neutrons together. C) Holding planets in orbit. D) Specific charge. Show Answer Correct Answer: B) Holding protons and neutrons together. 13. The mass number of He is 4 and that forsulphur is 32. The radius of sulphur nucleusis larger than that of helium by A) 2. B) $\sqrt[]{8}$. C) 8. D) 4. Show Answer Correct Answer: A) 2. 14. Atomic number of a nucleus represents A) Number of protons. B) Number of protons and neutrons. C) Number of neutrons. D) Number of nucleons. Show Answer Correct Answer: A) Number of protons. 15. A stable atom has: A) Equal numbers of Electrons & Neutrons. B) Different numbers of Protons. C) Equal numbers of Protons & Electrons. D) Equal numbers of Protons & Electrons. Show Answer Correct Answer: C) Equal numbers of Protons & Electrons. 16. Which decay process includes a neutrino? A) Alpha decay. B) Beta decay. C) Gamma decay. D) Neutron decay. Show Answer Correct Answer: B) Beta decay. 17. The energy released in a typical fusion reaction is approximately A) 25MeV. B) 800 MeV. C) 200 MeV. D) 600 MeV. Show Answer Correct Answer: A) 25MeV. 18. The density of a nucleus is of the order of: A) 10$^{15}$ kg m$^{-3}$. B) 10$^{16}$ kg m$^{-3}$. C) 10$^{18}$ kg m$^{-3}$. D) 10$^{17}$ kg m$^{-3}$. Show Answer Correct Answer: D) 10$^{17}$ kg m$^{-3}$. 19. The mass number of a nucleus is A and its atomic number is Z. The number of neutrons in the nucleus is: A) A-Z. B) A + Z. C) Z. D) A. Show Answer Correct Answer: A) A-Z. 20. Beta radiation is: A) 2 protons. B) A high speed electron. C) A wave. D) 2 protons and 2 neutrons. Show Answer Correct Answer: B) A high speed electron. 21. Ratio of the radii of the nuclei with mass numbers 8 and 27 will be: A) 2:3. B) 1:1. C) 4:9. D) 27:8. Show Answer Correct Answer: A) 2:3. 22. Complete the nuclear reaction$_{85}$$^{209}$At = ..... + $_{2}$$^{4}$He A) $_{85}$$^{208}$At. B) $_{81}$$^{207}$Tl. C) $_{86}$$^{209}$Rn. D) $_{83}$$^{205}$Bi. Show Answer Correct Answer: D) $_{83}$$^{205}$Bi. 23. Sun's radiant energy is due to: A) Photoelectric effect. B) Spontaneous radioactive decay. C) Nuclear fission. D) Nuclear fusion. Show Answer Correct Answer: D) Nuclear fusion. 24. Which particles in the atom exhibit the strong nuclear force? A) Protons. B) Neutrons. C) Electrons. D) Nucleons. Show Answer Correct Answer: D) Nucleons. 25. What is radioactive decay? A) An unstable nucleus breaks down to become more stable, giving off radiation. B) An unstable atom breaks down to become more stable, giving off radiation. C) An unstable element breaks down to become more stable, giving off radiation. D) An unstable compound breaks down to become more stable, giving off radiation. Show Answer Correct Answer: A) An unstable nucleus breaks down to become more stable, giving off radiation. 26. Strongest force in nature is A) Strong nuclear force. B) Electromagnetic force. C) Gravitational force. D) Weak nuclear force. Show Answer Correct Answer: A) Strong nuclear force. 27. Radius of a nucleus of mass number A is given by (R$_{o}$ is a constant) A) R = R$_{O}$-$_{ }$A$^{1/3}$. B) R = R$_{o }$A$^{1/3}$. C) R = R$_{O}$ +$_{ }$A$^{1/3}$. D) R = R$_{o }$A$^{1/2}$. Show Answer Correct Answer: B) R = R$_{o }$A$^{1/3}$. 28. Why do larger nuclei require more neutrons? A) To decrease the strong nuclear force. B) To enhance electromagnetic force. C) To increase gravitational pull. D) To balance the repulsive force between protons. Show Answer Correct Answer: D) To balance the repulsive force between protons. 29. The rate at which nuclear decay takes place is called: A) Quarter life. B) Gamma decay. C) Half-life. D) Isotope. Show Answer Correct Answer: C) Half-life. 30. When making mRNA, thymine always pairs with: A) Cytosine. B) Thymine. C) Guanine. D) Adenine. E) Uracil. Show Answer Correct Answer: D) Adenine. 31. What is the significance of alpha decay in large nuclei? A) It increases the nucleus size. B) It stabilizes the nucleus by reducing mass. C) It makes the nucleus unstable. D) It has no significant effect. Show Answer Correct Answer: B) It stabilizes the nucleus by reducing mass. 32. If A is the mass number, radius of a nucleus is A) Directly proportional to A$^{1/3}$. B) Inversely proportional to A$^{ 3}$. C) Directly proportional to A $^{3}$. D) Inversely proportional to A $^{1/3}$. Show Answer Correct Answer: A) Directly proportional to A$^{1/3}$. 33. What type of nuclear reaction occurs in the Sun? A) Alpha decay. B) Nuclear fusion. C) Nuclear fission. D) Beta decay. Show Answer Correct Answer: B) Nuclear fusion. 34. Radiation is emitted from: A) All atoms. B) Most atoms. C) Unstable atoms. D) Stable atoms. Show Answer Correct Answer: C) Unstable atoms. 35. The helium atom does not contain: A) Six nucleons. B) Two neutrons. C) Two protons. D) Two electrons. Show Answer Correct Answer: A) Six nucleons. 36. What do we call a nitrogen base bonded to a deoxyribose sugar? A) DNA. B) RNA. C) Nucleotide. D) Adenosine triphosphate. E) Nucleoside. Show Answer Correct Answer: E) Nucleoside. 37. What particle is considered a tiny piece of antimatter? A) Electron. B) Anti-neutrino. C) Neutrino. D) Proton. Show Answer Correct Answer: B) Anti-neutrino. 38. How many electrons are contained in $^{238}$$_{92}$U nucleus? A) 0. B) 238. C) 146. D) 92. Show Answer Correct Answer: A) 0. 39. An atom of mass number 24 consists of A) 11 electrons, 13 protons and 11 neutrons. B) 11 protons and 13 neutrons. C) 11 electrons, 11 protons and 13 neutrons. D) 11 protons and 13 electrons. Show Answer Correct Answer: C) 11 electrons, 11 protons and 13 neutrons. 40. Charged particles and energy that are emitted from the nuclei of radioisotopes. A) Beta particles. B) Nuclear decay. C) Nuclear radiation. D) Alpha particles. Show Answer Correct Answer: C) Nuclear radiation. 41. Is the process in which an unstable atomic nucleus emits charged particles and energy A) Background radiation. B) Radioisotope. C) Radioactivity. D) Beta decay. Show Answer Correct Answer: C) Radioactivity. 42. Any atom containing an unstable nucleus is called A) Particles. B) Nuclei. C) Radioisotope. D) Unisotope. Show Answer Correct Answer: C) Radioisotope. 43. An alpha particle consists of: A) 2 protons. B) A high speed electron. C) A wave. D) 2 protons and 2 neutrons. Show Answer Correct Answer: D) 2 protons and 2 neutrons. 44. Who proposed the existence of neutrinos? A) Niels Bohr. B) Albert Einstein. C) Enrico Fermi. D) Wolfgang Pauli. Show Answer Correct Answer: D) Wolfgang Pauli. 45. Gamma radiation is: A) 2 protons. B) A high speed electron. C) A wave. D) 2 protons and 2 neutrons. Show Answer Correct Answer: C) A wave. 46. Both a fusion reaction and a fission reaction produce A) Magnetism. B) Light. C) Heat (energy). D) Sound. Show Answer Correct Answer: C) Heat (energy). 47. Difference between mass number and atomic number of a nucleus represents A) Number of protons. B) Number of protons and neutrons. C) Number of neutrons. D) Number of nucleons. Show Answer Correct Answer: C) Number of neutrons. 48. Chadwick was awarded the Nobel prize in Physics in 1935 for his discovery of: A) Electron. B) Proton. C) Neutron. D) None of these. Show Answer Correct Answer: C) Neutron. 49. The most ionising A) $\beta^-$. B) $\gamma$. C) $\beta^+$. D) $\alpha$. Show Answer Correct Answer: D) $\alpha$. 50. Mass number of a nucleus represents A) Number of proton. B) Number of protons and electrons. C) Number of neutrons. D) Number of nucleons. Show Answer Correct Answer: D) Number of nucleons. 51. What happens to the atomic number in beta decay? A) It increases by 2. B) It remains the same. C) It increases by 1. D) It decreases by 1. Show Answer Correct Answer: C) It increases by 1. 52. This is the type of radiation that naturally occurs in the environment and is generally safe. A) Background radiation. B) Environment radiation. C) Ionizing radiation. D) None of the above. Show Answer Correct Answer: A) Background radiation. 53. How do the atomic number and mass number of a nucleus change during beta decay? A) The atomic number decreases by 1 and the mass number decreases by 1. B) The atomic number increases by 1 and the mass number increases by 1. C) The atomic number increases by 1 and the mass number remains constant. D) Neither changes. Show Answer Correct Answer: C) The atomic number increases by 1 and the mass number remains constant. 54. What analogy is used to describe the strong nuclear force? A) Magnet covered in velcro. B) Rope. C) Glue. D) Spring. Show Answer Correct Answer: A) Magnet covered in velcro. 55. What is the role of the strong nuclear force in the nucleus? A) It causes the nucleus to expand. B) It keeps the nucleus stable. C) It allows the nucleus to emit light. D) It makes the nucleus rotate. Show Answer Correct Answer: B) It keeps the nucleus stable. 56. Over what range is the strong nuclear force attractive? A) 0.5 fm to 3 fm. B) Less than 0.5 fm. C) Greater than 3 fm. D) 0.3 fm to 0.5 fm. Show Answer Correct Answer: A) 0.5 fm to 3 fm. 57. What is the role of the neutrino in beta decay? A) To conserve energy. B) To decrease mass. C) To emit light. D) To increase mass. Show Answer Correct Answer: A) To conserve energy. 58. What is emitted alongside a proton during beta decay? A) Positron. B) Photon. C) Neutron. D) Electron and anti-neutrino. Show Answer Correct Answer: D) Electron and anti-neutrino. 59. How many types of radiation are there? A) 4. B) 9. C) 3. D) 2. Show Answer Correct Answer: C) 3. 60. Nuclear force is: A) Strong, short range and charge independent force. B) Charge independent, attractive and long range force. C) Strong, charge dependent and short range attractive force. D) Long range, change dependent and attractive force. Show Answer Correct Answer: A) Strong, short range and charge independent force. Next →Related QuizzesScience QuizzesClass 12 QuizzesClass 12 Physics (Part Ii) Chapter 13 Nuclei Quiz 2Class 12 Physics (Part Ii) Chapter 10 Wave Optics QuizClass 12 Physics (Part Ii) Chapter 11 Dual Nature Of Radiation And Matter QuizClass 12 Physics (Part Ii) Chapter 12 Atoms QuizClass 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials QuizClass 12 Physics (Part Ii) Chapter 9 Ray Optics And Optical Instruments Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books