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 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 4 Structure Of The Atom Quiz 5 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Where are protons and neutrons located in an atom? A) In the center or nucleus. B) In the electron energy levels. C) In the electron cloud. D) In the atomic orbitals. Show Answer Correct Answer: A) In the center or nucleus. 2. The atomic number of an element is defined by its number of ..... A) Neutrons. B) Electrons. C) Nuclei. D) Protons. Show Answer Correct Answer: D) Protons. 3. The ..... particle determines the identity of what element you have' A) Neutron. B) Valence shell. C) Electron. D) Proton. Show Answer Correct Answer: D) Proton. 4. Chalk is mostly made of calcium carbonate, CaCO$_{3}$. If it took 48.6 g of chalk to write your name on the sidewalk, how many moles of calcium carbonate does your name contain? A) 2.06 mol. B) 1.40 mol. C) 0.486 mol. D) 0.714 mol. Show Answer Correct Answer: C) 0.486 mol. 5. Radiation that is made up of alpha particles; is deflected toward a negatively charged plate when radiation from a radioactive source is directed between two electrically charged plates A) Alpha radiation. B) Radiation. C) Beta radiation. D) Cathode ray. Show Answer Correct Answer: A) Alpha radiation. 6. How the sub atomic particles like Proton is different from electron? A) A proton can be easily removed from the atom, but not an electron. B) An electron carries more charge than a proton. C) A proton is positively charged, whereas an electron is negatively charged. D) An electron is much heavier than a proton. Show Answer Correct Answer: C) A proton is positively charged, whereas an electron is negatively charged. 7. John Dalton's ideas about atoms were similar to those of ..... A) Socrates. B) Plato. C) Democritus. D) Aristotle. Show Answer Correct Answer: C) Democritus. 8. If an electron is removed, an ion becomes A) Positive. B) Negative. C) An atom. D) Neutral. Show Answer Correct Answer: A) Positive. 9. Who proposed the the Christmas Pudding model A) J.J Thomson. B) Rutherford. C) Bohrs. D) None of the above. Show Answer Correct Answer: A) J.J Thomson. 10. The Shells are represented by the letters or numbers A) A B C D / 3 7 2 5. B) P Q R S / 5 6 7 8. C) K L M N / 1 2 3 4. D) None of the above. Show Answer Correct Answer: C) K L M N / 1 2 3 4. 11. What is the valence of an element? A) The total number of protons in the nucleus. B) The total number of electrons in the outermost shell. C) The total number of subatomic particles in the atom. D) The total number of neutrons in the nucleus. Show Answer Correct Answer: B) The total number of electrons in the outermost shell. 12. What are the orbitals for n=4 A) S, p, d, f. B) S, p. C) S, p, d. D) S. Show Answer Correct Answer: A) S, p, d, f. 13. Which of these is the correct definition for subatomic? A) An atom. B) Bigger than an atom. C) Smaller than an atom. D) Anything relating to an atom. Show Answer Correct Answer: C) Smaller than an atom. 14. Which best describes the movement of electrons? A) They only move when the atom is part of a gas. B) They are constantly moving. C) They move slowly. D) They follow fixed paths in the atom. Show Answer Correct Answer: B) They are constantly moving. 15. The amount of space something takes up A) Density. B) Volume. C) Mass. D) Matter. Show Answer Correct Answer: B) Volume. 16. Who was the first to propose that matter was composed of tiny indivisible particles. His work was not based on experimental data. A) Dalton. B) Thomson. C) Alchemist. D) Rutherford. E) Democritus. Show Answer Correct Answer: E) Democritus. 17. An atom has four shells and 19 protons in its atom, what is its valency? A) 3. B) 4. C) 2. D) 1. Show Answer Correct Answer: D) 1. 18. When is an ion negatively charged? A) If it has more electrons than protons. B) It cannot be negatively charged. C) If it has the same number of protons and electrons. D) If it has more protons than electrons. Show Answer Correct Answer: A) If it has more electrons than protons. 19. What is the mass contribution of a neutron? A) 1amu. B) 0 knit. C) It varies. D) 2 you. Show Answer Correct Answer: A) 1amu. 20. Which atom is represented by 10 protons, 10 neutrons, and 10 electrons. A) Oxygen. B) Carbon. C) Neon. D) Sodium. Show Answer Correct Answer: C) Neon. 21. Experiments with cathode rays being deflected by a magnetic field show that cathode rays are composed of particles that are A) Negatively charged. B) Positively charged. C) Neutral in charge. D) Magnetic. Show Answer Correct Answer: A) Negatively charged. 22. The atomic number of Sulphur (S) is 16. Identify the number of electrons in each shell ofSulphur. A) 2, 8, 6. B) 2, 2, 8, 4. C) 2, 8, 8. D) 2, 4, 8, 2. Show Answer Correct Answer: A) 2, 8, 6. 23. What are charged atoms called? A) Ions. B) Molecules. C) Isotopes. D) Compounds. Show Answer Correct Answer: A) Ions. 24. Radiation that originates from the cathode and travels to the anode of a cathode-ray tube A) Cathode ray. B) Radiation. C) Gamma ray. D) Alpha radiation. Show Answer Correct Answer: A) Cathode ray. 25. What does electron configuration notation describe? A) The distribution of electrons in an atom's nucleus. B) The distribution of protons in an atom's energy levels. C) The distribution of electrons in an atom's energy levels. D) The distribution of neutrons in an atom's energy levels. Show Answer Correct Answer: C) The distribution of electrons in an atom's energy levels. 26. We know that objects with like electric charge repel one another. Which statement best explains why protons can remain close to one another in a nucleus? A) There is no electric charge in the nucleus of an atom. B) A short-range force, called the strong nuclear force, binds protons together. C) Protons are balanced electrically by electrons. D) Neutrons cancel out the electric force. Show Answer Correct Answer: B) A short-range force, called the strong nuclear force, binds protons together. 27. What law states that, regardless of the amount, a compound is always composed of the same elements in the same proportion by mass? A) Law of multiple proportions. B) Law of definite proportions. C) Law of mass action. D) Law of conservation of mass. Show Answer Correct Answer: B) Law of definite proportions. 28. Canal rays discovered by E. Goldstein contained particles that were: A) Neutral. B) Positively charged. C) Negatively charged. D) None of these. Show Answer Correct Answer: B) Positively charged. 29. Which model of the atom first introduced the concept of quantized electron orbits? A) Quantum mechanical model. B) Thomson model. C) Bohr model. D) Rutherford model. Show Answer Correct Answer: C) Bohr model. 30. Who discovered the presence of neutrons in the atom? A) J. Chadwick. B) J.J. Thomson. C) John Dalton. D) E. Goldstein. Show Answer Correct Answer: A) J. Chadwick. 31. Which isotope of carbon is used in carbon dating? A) Carbon-14. B) Carbon-13. C) Carbon-12. D) None of the above. Show Answer Correct Answer: A) Carbon-14. 32. ..... is the universal solvent because it dissolves most substances. A) Oxygen. B) Salt. C) Water. D) Gatorade. Show Answer Correct Answer: C) Water. 33. What did Rutherford conclude from his $\alpha$-ray scattering experiment? A) Atom consists of predominantly empty space. B) Atom contains a centrally placed positively charged nucleus. C) Most of the space in an atom is empty. D) All of the above. Show Answer Correct Answer: D) All of the above. 34. If reaction starts with 20g of reactants it should produce A) A total of 10g of products. B) A total of 40g of products. C) A total of 80 g of products. D) A total of 20g of products. Show Answer Correct Answer: D) A total of 20g of products. 35. A neutron has this charge A) Negative. B) Positive. C) Neutral. D) None of the above. Show Answer Correct Answer: C) Neutral. 36. Except for in the simplest type of hydrogen atom, all nuclei consist of A) Protons and electrons. B) Neutrons and positrons. C) Protons and neutrons. D) Electrons and positrons. Show Answer Correct Answer: C) Protons and neutrons. 37. What is correct about electrons? A) Are positively charged subparticles found in energy levels. B) Are negatively charged subparticles found in the electron cloud. C) Are negatively charged particles found in the nucleus. D) Are subparticles with no charge found in the electron cloud. Show Answer Correct Answer: B) Are negatively charged subparticles found in the electron cloud. 38. The only element with no neutrons in its nucleus. A) Helium. B) Hydrogen. C) Oxygen. D) Lithium. Show Answer Correct Answer: A) Helium. 39. Atoms are electrically neutral when A) They have a minimal charge. B) They have a balanced number of protons and neutrons. C) They have a balanced number of protons and electrons. D) They have no valance electrons. Show Answer Correct Answer: C) They have a balanced number of protons and electrons. 40. Who discovered the electron? A) Thomson. B) Rutherford. C) Chadwick. D) Goldstein. Show Answer Correct Answer: A) Thomson. 41. Who discovered the presence of electrons in the atom? A) E. Goldstein. B) J. Chadwick. C) John Dalton. D) J.J. Thomson. Show Answer Correct Answer: D) J.J. Thomson. 42. How many p orbitals are there in a sublevel? A) 3. B) 2. C) 4. D) 1. Show Answer Correct Answer: A) 3. 43. Drawback of Rutherford model is? A) Shape of orbitals is circular. B) Nucleons are at the center. C) Electrons deflected alpha rays. D) None of the above. Show Answer Correct Answer: A) Shape of orbitals is circular. 44. The total volume of the nucleus of an atom is A) Very large compared with the rest of the atom. B) Very small compared with the rest of the atom. C) About the same size as an electron. D) Smaller than a neutron. Show Answer Correct Answer: B) Very small compared with the rest of the atom. 45. Which of these has a negative charge? A) Electron. B) Proton. C) Neutron. D) Oatmeal. Show Answer Correct Answer: A) Electron. 46. The central region of an atom where its neutrons and protons are is its ..... A) Core. B) Electron cloud. C) Nucleus. D) Centre. Show Answer Correct Answer: C) Nucleus. 47. The nucleus is ..... charged. A) Positively. B) Negatively. C) Neutral. D) None of the above. Show Answer Correct Answer: A) Positively. 48. Which of these things would be considered subatomic? A) Copper. B) Electron. C) Oxygen. D) Water molecule. Show Answer Correct Answer: B) Electron. 49. Which of the following represent electronic distribution in magnesium atom A) 8, 2, 2. B) 2, 8, 2. C) 1, 8, 3. D) 3, 8, 1. Show Answer Correct Answer: B) 2, 8, 2. 50. ..... is the lowest energy level an electron will occupy in an atom at an ordinary condition A) Ground state. B) Excited state. C) Highest state. D) None of the above. Show Answer Correct Answer: A) Ground state. 51. Which isotope of hydrogen does not possess neutron? A) Protium. B) Deuterium. C) Tritium. D) None of the above. Show Answer Correct Answer: A) Protium. 52. How many electrons are in a neutral atom of magnesium? A) 24.3. B) 12. C) 24. D) 10. Show Answer Correct Answer: B) 12. 53. The area around the nucleus of an atom where the atom's electrons are most likely to be found is called A) Quark. B) Electron cloud. C) Nucleus. D) Electron. Show Answer Correct Answer: B) Electron cloud. 54. Atom X has a proton number of 5 and a nucleon number of 11. How many protons, electrons and neutrons are present in atom X? A) Protons:5Electrons:5Neutrons:11. B) Protons:6Electrons:6Neutrons:5. C) Protons:5Electrons:5Neutrons:6. D) Protons:5Electrons:6Neutrons:6. Show Answer Correct Answer: C) Protons:5Electrons:5Neutrons:6. 55. Which of the following statement is always correct? A) An atom has equal no.of protons and electrons. B) An atom has equal no.of electrons and neutrons. C) An atom has equal no.of protons and neutrons. D) None of the above. Show Answer Correct Answer: A) An atom has equal no.of protons and electrons. 56. What is the primary factor that determines the chemical element of an atom? A) Number of neutrons. B) Number of electrons. C) Atomic mass. D) Number of protons. Show Answer Correct Answer: D) Number of protons. 57. The type of an atom is identified by its ..... A) Number of positrons. B) Atomic number. C) Mass number. D) Number of nucleons. Show Answer Correct Answer: B) Atomic number. 58. The number of electron shells an atom has is determined by its ..... A) Period. B) Main Group. C) Atomic Number. D) None of the above. Show Answer Correct Answer: A) Period. 59. Which statement best describes an electron? A) Smaller mass than a proton and a negative charge. B) Smaller mass than a proton and a positive charge. C) Greater mass than a proton and a negative charge. D) Greater mass than a proton and a positive charge. Show Answer Correct Answer: A) Smaller mass than a proton and a negative charge. 60. What noble gas should be used to write the shorthand configuration for Te? A) Kr. B) Car. C) Sb. D) Ar. Show Answer Correct Answer: A) Kr. ← 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 3Class 9 Science Chapter 4 Structure Of The Atom Quiz 4Class 9 Science Chapter 4 Structure Of The Atom Quiz 6 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books