This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 4 Structure Of The Atom – Quiz 11 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 4 Structure Of The Atom Quiz 11 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Protons have a ..... charge A) Negative. B) Potiveive. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Potiveive. 2. The atomic number of an element is defined by its number of ..... A) Protons. B) Neutrons. C) Electrons. D) Nuclei. Show Answer Correct Answer: A) Protons. 3. The ..... particle determines the identity of what element you have' A) Electron. B) Proton. C) Neutron. D) Valence shell. Show Answer Correct Answer: B) 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) 0.486 mol. B) 0.714 mol. C) 1.40 mol. D) 2.06 mol. Show Answer Correct Answer: A) 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) Beta radiation. C) Cathode ray. D) Radiation. Show Answer Correct Answer: A) Alpha radiation. 6. How the sub atomic particles like Proton is different from electron? A) An electron is much heavier than a proton. B) An electron carries more charge than a proton. C) A proton can be easily removed from the atom, but not an electron. D) A proton is positively charged, whereas an electron is negatively charged. Show Answer Correct Answer: D) A proton is positively charged, whereas an electron is negatively charged. 7. John Dalton's ideas about atoms were similar to those of ..... A) Aristotle. B) Plato. C) Socrates. D) Democritus. Show Answer Correct Answer: D) Democritus. 8. If an electron is removed, an ion becomes A) An atom. B) Positive. C) Negative. D) Neutral. Show Answer Correct Answer: B) 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 electrons in the outermost shell. B) The total number of protons in the nucleus. C) The total number of neutrons in the nucleus. D) The total number of subatomic particles in the atom. Show Answer Correct Answer: A) The total number of electrons in the outermost shell. 12. What are the orbitals for n=4 A) S. B) S, p. C) S, p, d. D) S, p, d, f. Show Answer Correct Answer: D) 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 follow fixed paths in the atom. B) They move slowly. C) They are constantly moving. D) They only move when the atom is part of a gas. Show Answer Correct Answer: C) They are constantly moving. 15. The amount of space something takes up A) Volume. B) Density. C) Mass. D) Matter. Show Answer Correct Answer: A) 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) Democritus. B) Dalton. C) Rutherford. D) Thomson. E) Alchemist. Show Answer Correct Answer: A) Democritus. 17. An atom has four shells and 19 protons in its atom, what is its valency? A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: A) 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) It varies. B) 2 you. C) 0 knit. D) 1amu. Show Answer Correct Answer: D) 1amu. 20. Which atom is represented by 10 protons, 10 neutrons, and 10 electrons. A) Sodium. B) Neon. C) Oxygen. D) Carbon. Show Answer Correct Answer: B) Neon. 21. Experiments with cathode rays being deflected by a magnetic field show that cathode rays are composed of particles that are A) Magnetic. B) Negatively charged. C) Positively charged. D) Neutral in charge. Show Answer Correct Answer: B) 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, 8, 8. C) 2, 2, 8, 4. D) 2, 4, 8, 2. Show Answer Correct Answer: A) 2, 8, 6. 23. What are charged atoms called? A) Compounds. B) Isotopes. C) Ions. D) Molecules. Show Answer Correct Answer: C) Ions. 24. Radiation that originates from the cathode and travels to the anode of a cathode-ray tube A) Cathode ray. B) Alpha radiation. C) Gamma ray. D) Radiation. Show Answer Correct Answer: A) Cathode ray. 25. What does electron configuration notation describe? A) The distribution of protons in an atom's energy levels. B) The distribution of neutrons in an atom's energy levels. C) The distribution of electrons in an atom's energy levels. D) The distribution of electrons in an atom's nucleus. Show Answer Correct Answer: C) The distribution of electrons in an atom's energy levels. ← PreviousNext →Related 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 5Class 9 Science Chapter 4 Structure Of The Atom Quiz 6Class 9 Science Chapter 4 Structure Of The Atom Quiz 7Class 9 Science Chapter 4 Structure Of The Atom Quiz 8Class 9 Science Chapter 4 Structure Of The Atom Quiz 9Class 9 Science Chapter 4 Structure Of The Atom Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books