This quiz works best with JavaScript enabled. Home > Cbse > Class 9 > Science > Structure Of The Atom > Class 9 Science Chapter 4 Structure Of The Atom – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 4 Structure Of The Atom Quiz 3 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A student cuts a piece of gold wire into the smallest possible pieces. Which statement best describes the smallest piece of gold wire? A) The gold changes properties and becomes a new element. B) The chemical properties of the gold change as the wire is cut. C) The smallest piece of wire is no longer gold. D) The wire is still gold and has become an atom of gold. Show Answer Correct Answer: D) The wire is still gold and has become an atom of gold. 2. The max no of electron in the outermost orbit is ..... A) 8. B) 44. C) 7. D) 56. Show Answer Correct Answer: A) 8. 3. The mass of a proton/neutron is ..... A) 1 a.m.u. B) 1 m/s. C) 1/1836 a.m.u. D) None of the above. Show Answer Correct Answer: A) 1 a.m.u. 4. The ..... are found in shells. A) Protons. B) -1. C) +1. D) Neutrons. E) Electrons. Show Answer Correct Answer: E) Electrons. 5. When an atom contains more neutrons than another atom, it is A) A neutral atom with no charge. B) An ion and negatively charged. C) An ion and positively charged. D) An isotope and has more mass. Show Answer Correct Answer: D) An isotope and has more mass. 6. Which subatomic particle is responsible for the chemical properties of an element? A) Proton. B) Nucleus. C) Electron. D) Neutron. Show Answer Correct Answer: C) Electron. 7. The alpha particles used by Rutherford in his Gold Foil experiment are: A) Helium ions. B) Helium atoms. C) Protons. D) Neutrons. Show Answer Correct Answer: A) Helium ions. 8. Which of the following subatomic particle determines the identity of an element? A) Neutron. B) Proton. C) Electron. D) None of the above. Show Answer Correct Answer: B) Proton. 9. Which subatomic particle is found in the nucleus and has no charge? A) Electron. B) Photon. C) Neutron. D) Proton. Show Answer Correct Answer: C) Neutron. 10. Mass of proton is A) Negligible. B) 1. C) Zero. D) 2. Show Answer Correct Answer: B) 1. 11. Which of the following statements is true about the 3s and the 4s sublevels? A) These sublevels are the same distance from the nucleus. B) These sublevels have the same shape. C) These sublevels hold different amounts of electrons. D) These sublevels have the same energy. Show Answer Correct Answer: B) These sublevels have the same shape. 12. Protium is the isotope of A) Chlorine. B) Hydrogen. C) Iodine. D) Oxygen. Show Answer Correct Answer: B) Hydrogen. 13. Electrons can be found A) Inside neutrons. B) Moving rapidly outside the nucleus. C) Inside protons. D) Attached to the nucleus. Show Answer Correct Answer: B) Moving rapidly outside the nucleus. 14. Which of the following scientists discovered the electron? A) Ernest Rutherford. B) James Chadwick. C) Niels Bohr. D) J. J. Thomson. Show Answer Correct Answer: D) J. J. Thomson. 15. The valency of noble gases is A) 1. B) 0. C) 2. D) None of the above. Show Answer Correct Answer: B) 0. 16. What part of the water cycle can carry pollutants from your yard to streams and rivers? A) Evaporation. B) Condensation. C) Precipitation. D) Runoff. Show Answer Correct Answer: D) Runoff. 17. A certain atom has 26 protons, 26 electrons, and 30 neutrons. What is its mass number? A) 26. B) 56. C) 30. D) 52. Show Answer Correct Answer: B) 56. 18. A scientists analyzed an unknown sample and determined that it contained 5 moles of oxygen and 2 moles of nitrogen? Which of the following would be its molecular formula? A) Brush. B) 4 fish. C) N2O5. D) NO. Show Answer Correct Answer: C) N2O5. 19. The law of ..... states that mass is neither created nor destroyed during chemical reactions or physical changes. A) Definite proportions. B) Universal gravitation. C) Multiple proportions. D) Conservation of mass. Show Answer Correct Answer: D) Conservation of mass. 20. Sub-Atomic Particles are A) Particles that atoms are made of. B) Particles that solutions are made of. C) Particles that metals are made of. D) None of the above. Show Answer Correct Answer: A) Particles that atoms are made of. 21. How are electrons arranged in an atom? A) By shape. B) In groups of five. C) By color. D) In energy levels. Show Answer Correct Answer: D) In energy levels. 22. The atomic number of an atom is A) The number of protons in its nucleus. B) The number of protons in the electron cloud. C) The number of neutrons in the electron cloud. D) The number of electrons in the nucleus. Show Answer Correct Answer: A) The number of protons in its nucleus. 23. The electron configuration of an atom is 1s$^{2}$2s$^{2}$2p$^{6}$. The number of electrons in the atom is A) 6. B) 10. C) 3. D) 8. Show Answer Correct Answer: B) 10. 24. What is the electronic configuration of helium? A) 2, 8, 8. B) 1, 2. C) 2, 1, 5. D) 2. Show Answer Correct Answer: D) 2. 25. Which of the following is the use of phosphorus-32 isotope? Antara following, which is the use of isotopes phosphorus-32? A) Kills microorganisms in food stuffs kill microorganisms in food. B) X-ray for Body Examination-Xamination for Body Inspection. C) Studying the metabolism of planting plant metabolism. D) Dating for the age of fossils and artifacts pentarikhan fossil age and artifact. Show Answer Correct Answer: C) Studying the metabolism of planting plant metabolism. 26. Carbon-12 and Carbon-14 are both isotopes of Carbon. What do the 12 and 14 mean? A) The total number of protons in the nucleus. B) The total number of neutrons in the nucleus. C) The total number of nucleons in the nucleus. D) The total number of electrons around the nucleus. Show Answer Correct Answer: C) The total number of nucleons in the nucleus. 27. High-energy radiation that has no electrical charge and no mass, is not deflected by electric or magnetic fields, usually accompanies alpha and beta radiation, and accounts for most of the energy lost during radioactive decay A) Radioactivity. B) Cathode ray. C) Gamma ray. D) Radiation. Show Answer Correct Answer: C) Gamma ray. 28. One-twelfth the mass of a carbon-12 atom A) Mass number. B) Atomic number. C) Atomic mass unit. D) Atomic mass. Show Answer Correct Answer: C) Atomic mass unit. 29. Rutherford realized that the atomic nucleus was positively charged because A) It produced alpha particles. B) It deflected alpha particles. C) It attracted alpha particles. D) It had no effect on alpha particles. Show Answer Correct Answer: B) It deflected alpha particles. 30. An element has 5 valence electron, what is its valency? A) 3. B) 2. C) 1. D) 4. Show Answer Correct Answer: A) 3. 31. What are isotopes?ELEMENTS having the A) Same atomic no, but different mass no. B) Same mass no, different valency. C) Same mass no and atomic no. D) None of the above. Show Answer Correct Answer: A) Same atomic no, but different mass no. 32. The number of protons in an atom A) Atomic mass unit. B) Atomic mass. C) Atomic number. D) Mass number. Show Answer Correct Answer: C) Atomic number. 33. The extremely small, positively charged, dense center of an atom that contains positively charge protons and neutral neutrons A) Neutron. B) Electron. C) Protons. D) Nucleus. Show Answer Correct Answer: D) Nucleus. 34. Which element would be inert in nature? A) Element with 20 electrons. B) Element with 9 electrons. C) Element with 12 electrons. D) Element with 2 electrons. Show Answer Correct Answer: D) Element with 2 electrons. 35. Which statement correctly describes the location and charge of the neutrons in an atom? A) The neutrons are inside the nucleus and have a positive charge. B) The neutrons are outside the nucleus and have a neutral charge. C) The neutrons are outside the nucleus and have a negative charge. D) The neutrons are inside the nucleus and have a neutral charge. Show Answer Correct Answer: D) The neutrons are inside the nucleus and have a neutral charge. 36. An element can be defined by the number of ..... in the nucleus of its atoms. A) Atoms. B) Electrons. C) Protons. D) Neutrons. Show Answer Correct Answer: C) Protons. 37. Quarks make up which two subatomic particles? A) Protons and neutrons. B) Protons and electrons. C) Neutrons and electrons. D) Protons and ions. Show Answer Correct Answer: A) Protons and neutrons. 38. Which of the following sets of particles would have a relative mass of approximately 12 amu and a neutral charge? A) 6 protons and 6 electrons. B) 12 neutrons and 12 electrons. C) 3 protons, 3 neutrons and 6 electrons. D) 6 protons, 6 neutrons and6 electrons. Show Answer Correct Answer: D) 6 protons, 6 neutrons and6 electrons. 39. The Expriment of Gold foil was about ..... thick A) 10 atoms. B) 1000 atoms. C) 100 atoms. D) None of the above. Show Answer Correct Answer: B) 1000 atoms. 40. Who discovered the nucleus of an atom? A) JJ Thomson. B) Democritus. C) Ernest Rutherford. D) John Dalton. Show Answer Correct Answer: C) Ernest Rutherford. 41. An atom of $U_{92}^{238}$ A) 238, 146. B) 330, 92. C) 146, 92. D) 92, 146. Show Answer Correct Answer: D) 92, 146. 42. A certain element is known to exist as two different isotopes. State one thing that is the same for atoms of both isotopes. A) The number of neutrons. B) The number of protons. C) The number of quarks. D) The number of nucleons. Show Answer Correct Answer: B) The number of protons. 43. Which of the following is NOT a part of Dalton's atomic theory? A) Atoms cannot be divided, created or destroyed. B) The number of protons in an atom is its atomic number. C) In chemical reactions, atoms are combined, separated or rearranged. D) All matter is composed of extremely small particles called atoms. Show Answer Correct Answer: B) The number of protons in an atom is its atomic number. 44. In an atom, electrons move in definite orbits around the nucleus. A) Thompson. B) Rutherford. C) Dalton. D) Neil Bohr. Show Answer Correct Answer: D) Neil Bohr. 45. The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion? A) 13. B) 10. C) 16. D) 14. Show Answer Correct Answer: B) 10. 46. The number 80 in the name bromine-80 represents ..... A) The atomic number. B) The mass number. C) The sum of protons and electrons. D) None of the above. Show Answer Correct Answer: B) The mass number. 47. The mass of a helium atom is twice that of a hydrogen atom A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 48. What is the central part of an atom called, which contains protons and neutrons? A) Orbit. B) Electron cloud. C) Shell. D) Nucleus. Show Answer Correct Answer: D) Nucleus. 49. What is the shape of s orbitals? A) Spherical shaped. B) Hybrid structure. C) Peanut shaped. D) Dumbbell shaped. Show Answer Correct Answer: A) Spherical shaped. 50. What is the approximate radius of an atom? A) 1x10$^{-5}$ m. B) 1x10$^{-20}$ m. C) 1x10$^{-10}$ m. D) 1x10$^{-15}$ m. Show Answer Correct Answer: C) 1x10$^{-10}$ m. 51. The number of neutrons in the nucleus of an atom can be calculated by ..... A) Adding together the numbers of electrons and protons. B) Subtracting the number of protons from the number of electrons. C) Subtracting the number of protons from the mass number. D) Adding the mass number to the number of protons. Show Answer Correct Answer: C) Subtracting the number of protons from the mass number. 52. Solve this equation for alpha decay.$_{8}$$_{5}$$^{209}$At = ..... + $_{2}$$^{4}$He A) $_{81}$$^{207}$Tl. B) $_{83}$$^{205}$Bi. C) $_{85}$$^{208}$At. D) $_{86}$$^{209}$Rn. Show Answer Correct Answer: B) $_{83}$$^{205}$Bi. 53. An atom of Element "Hydrogenn" has 4 electrons, and has 9 nucleons. Mass number is: A) Heard. B) 14u. C) 9U. D) 13u. Show Answer Correct Answer: C) 9U. 54. "ELECTRNOS MOVE AROUND THE NUCLEUS IN DISCRETE ORBITS CALLED IN ENERGY CELLS"This statement is from ..... Model A) Craydon. B) Rutherfors. C) Bose. D) J.J Thomson. Show Answer Correct Answer: C) Bose. 55. Electron is represented by A) C. B) P. C) G. D) E. Show Answer Correct Answer: D) E. 56. A proton has this charge A) Negative. B) Positive. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Positive. 57. Mass of electron is taken as A) Negligible. B) Same as that of proton. C) 2. D) 1. Show Answer Correct Answer: A) Negligible. 58. If K and L shells of an atom are full, then what would be the total no.of electrons in the atom A) 16. B) 10. C) 18. D) 12. Show Answer Correct Answer: B) 10. 59. Cathode rays are composed of particles that are now known as A) Protons. B) Electrons. C) Neutrons. D) Positrons. Show Answer Correct Answer: B) Electrons. 60. The relative atomic mass of an element has no unit. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. ← PreviousNext →Related QuizzesScience QuizzesClass 9 QuizzesClass 9 Science Chapter 4 Structure Of The Atom Quiz 1Class 9 Science Chapter 4 Structure Of The Atom Quiz 2Class 9 Science Chapter 4 Structure Of The Atom Quiz 4Class 9 Science Chapter 4 Structure Of The Atom Quiz 5Class 9 Science Chapter 4 Structure Of The Atom Quiz 6 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books