This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 4 Structure Of The Atom – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 4 Structure Of The Atom Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the electronic configuration of Magnesium? A) 2, 3. B) 2, 8, 1. C) 2, 8, 2. D) 2, 8, 3. Show Answer Correct Answer: C) 2, 8, 2. 2. What is the major drawback of Rutherford's atomic model? A) Electrons revolve around the nucleus in well-defined orbits. B) Electrons lose their energy and fall into the nucleus. C) Atom is highly unstable. D) All of the above. Show Answer Correct Answer: B) Electrons lose their energy and fall into the nucleus. 3. How many electrons can the first energy level of an atom fit? A) Six. B) Four. C) Eight. D) Two. Show Answer Correct Answer: D) Two. 4. True or false:Atoms make up everything around you. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 5. Chlorine has a atomic number of 17. This means it will have: A) 7 valence electrons and a valency of 1. B) 1 valence electrons and a valency of 7. C) All the above. D) None of the above. Show Answer Correct Answer: A) 7 valence electrons and a valency of 1. 6. Which of the following is NOT the correct explanation of Thompson's atomic model? A) The atom is positively charged sphere. B) Electrons are embedded in the positive sphere. C) The positive and negative charges balance each other. D) Protons and neutrons are embedded in the center of the sphere. Show Answer Correct Answer: D) Protons and neutrons are embedded in the center of the sphere. 7. Which scientist determined that almost all of an atom's mass of is located in its nucleus? A) Dalton. B) Democritus. C) Rutherford. D) Thomson. Show Answer Correct Answer: C) Rutherford. 8. Thomson's Model of an atom is similar to A) Seeds in the Mango. B) Seeds In the Apple. C) Seeds in the Watermelon. D) None of the above. Show Answer Correct Answer: C) Seeds in the Watermelon. 9. The mass number of an atom is the A) Number of protons in its nucleus. B) Combined total of protons and neutrons in its nucleus. C) All the above. D) None of the above. Show Answer Correct Answer: B) Combined total of protons and neutrons in its nucleus. 10. How many d orbitals are there in a given sublevel? A) 1. B) 3. C) 5. D) 7. Show Answer Correct Answer: C) 5. 11. What are isotopes? A) Atoms of different elements with the same atomic number. B) Atoms of the same element with different atomic numbers. C) Atoms of the same element with the same atomic number but different mass numbers. D) Atoms of different elements with different atomic numbers and mass numbers. Show Answer Correct Answer: C) Atoms of the same element with the same atomic number but different mass numbers. 12. Which best summarizes the subatomic particles and their electrical charge? A) Proton= PositiveNeutron= NegativeElectron= No charge. B) Proton = NegativeNeutron= PositiveElectron= No charge. C) Proton= PositiveNeutron= No chargeElectron=Negative. D) Proton= No chargeNeutron= NegativeElectron=Positive. Show Answer Correct Answer: C) Proton= PositiveNeutron= No chargeElectron=Negative. 13. Which subatomic particle determines the identity of an atom? A) Proton. B) Neutron. C) Electron. D) None of the above. Show Answer Correct Answer: A) Proton. 14. A spontaneous process in which unstable nuclei lose energy by emitting radiation A) Radioactive decay. B) Radiation. C) Radioactivity. D) Alpha radiation. Show Answer Correct Answer: A) Radioactive decay. 15. Which of the following statements is incorrect about the structure of an atom?i. The whole mass of an atom is concentrated in the nucleusii. The atom is an indivisible particleiii. The atom as a whole is neutraliv. All the atoms are stable in their basic stateChoose the right option among the following: A) (i) and (iii). B) Only (ii). C) (ii) and (iv). D) None of these. Show Answer Correct Answer: C) (ii) and (iv). 16. What is the maximum number of electrons that an orbital can have? A) 1 electron. B) 2 electrons. C) 3 electrons. D) 4 electrons. Show Answer Correct Answer: B) 2 electrons. 17. Which substance undergoes sublimation process when heated? Which material undergoes the process of heating when heated? A) Iodine / iodin. B) Chlorine / Klorin. C) Sodium chloride / Natrium klorida. D) Lead (II) Bromide / Plumbum (II) Bromide. Show Answer Correct Answer: A) Iodine / iodin. 18. Which of the following statements is true about the kinetic theory of matter? A) The particles in liquids are packed closely together in an orderly manner. B) The particles in solids move randomly. C) The forces between the particles of gases are stronger than those of liquids. D) The energy content of a gas is higher than that of a solid. Show Answer Correct Answer: D) The energy content of a gas is higher than that of a solid. 19. The net charge on an atom is A) Positive. B) Neutral. C) Negative. D) None of the these. Show Answer Correct Answer: B) Neutral. 20. An element has the mass number 12 and atomic number 6. The number of neutrons in it is: A) 6. B) 10. C) 4. D) 8. Show Answer Correct Answer: A) 6. 21. What atom matches this electron configuration?[Xe] 6s$^{2 }$4f$^{14 }$5d$^{9}$ A) Mercury. B) Gold. C) Platinum. D) Thallium. Show Answer Correct Answer: B) Gold. 22. The nucleus of an atom makes up ..... of its mass. A) Almost none. B) 50%. C) 90%. D) 99.9%. Show Answer Correct Answer: D) 99.9%. 23. Which subatomic particle was discovered first? A) Proton. B) Electron. C) Neutron. D) None of the above. Show Answer Correct Answer: A) Proton. 24. Rutherford's alpha scattering experiment led to the discovery of A) Electron. B) Proton. C) Nucleus. D) Neutron. Show Answer Correct Answer: C) Nucleus. 25. The process in which some substances spontaneously emit radiation A) Radioactivity. B) Radioactive decay. C) Radiation. D) Beta radiation. Show Answer Correct Answer: A) Radioactivity. Next →Related QuizzesClass 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 10Class 9 Science Chapter 4 Structure Of The Atom Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books