This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 4 Structure Of The Atom – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 4 Structure Of The Atom Quiz 4 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. When an atom contains more electrons than protons, 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: B) An ion and negatively charged. 2. What were the observations made by Rutherford in his $\alpha$-ray scattering experiment? A) Most of the $\alpha$-particles passed through the gold foil undeflected. B) Some of the $\alpha$-particles deflected by the foil by small angles. C) One out of every 12000 particles appeared to rebound. D) All of the above. Show Answer Correct Answer: D) All of the above. 3. Carbon has a atomic number of 6. Calculate the number neutrons in C-14. A) 6. B) 7. C) 14. D) 8. Show Answer Correct Answer: D) 8. 4. E. Goldstein in 1886 discovered the presence of new radiations in a gas discharge and called them ..... A) Energy rays. B) Canal rays. C) Nuclear rays. D) None of the above. Show Answer Correct Answer: B) Canal rays. 5. How do the isotopes hydrogen-2 and hydrogen-3 differ? A) Hydrogen-3 has one more electron than hydrogen-2. B) Hydrogen-3 has two neutrons. C) Hydrogen-2 has three protons. D) Hydrogen-2 has no protons. Show Answer Correct Answer: B) Hydrogen-3 has two neutrons. 6. Protium, Deuterium, and Tritium are types of ..... A) Isobar. B) Isotope. C) Isotone. D) Isomer. Show Answer Correct Answer: B) Isotope. 7. Which model of an atom places electrons on energy levels/shells? A) Rutherford model. B) Bell model. C) Bohr model. D) Newton model. Show Answer Correct Answer: C) Bohr model. 8. A negatively charged, fast-moving particle with an extremely small mass that is found in all forms of matter and moves through the empty space surrounding an atom's nucleus A) Electron. B) Proton. C) Neutron. D) Nucleus. Show Answer Correct Answer: A) Electron. 9. An atom has a mass number of 23 and atomic number 11. The number of protons is ..... A) 11. B) 12. C) 23. D) 44. Show Answer Correct Answer: A) 11. 10. Subatomic particles with a negative charge A) Electrons. B) Neutrons. C) Protons. D) Quarks. Show Answer Correct Answer: A) Electrons. 11. Which of the following is true for any atom? A) Atomic number = number of protons = number of electrons. B) Atomic number = number of neutrons = number of electrons. C) Mass number = number of protons = number of electrons. D) Mass number = number of protons = number of neutrons. Show Answer Correct Answer: A) Atomic number = number of protons = number of electrons. 12. What is the charge of a proton? A) It varies. B) Negative. C) Positive. D) Neutral. Show Answer Correct Answer: C) Positive. 13. What is the mass number? A) The number of protons. B) The sum of the number of protons and the number of neutrons in the nucleus of an atom. C) The number of electrons. D) The number of neutrons. Show Answer Correct Answer: B) The sum of the number of protons and the number of neutrons in the nucleus of an atom. 14. What is the lightest subatomic particle? A) Atom. B) Electron. C) Proton. D) Neutron. Show Answer Correct Answer: B) Electron. 15. Neutrons have ..... charge. A) Positive. B) Negative. C) No. D) None of the above. Show Answer Correct Answer: C) No. 16. What is the maximum number of electrons that can be accommodated in the M shell? A) 2. B) 8. C) 18. D) 32. Show Answer Correct Answer: C) 18. 17. Who discovered the proton A) J. J. Thomson. B) E. Goldstein. C) Rutherford. D) Chadwik. Show Answer Correct Answer: B) E. Goldstein. 18. What is the charge of a neutron? A) Positive. B) Negative. C) Neutral. D) None of the above. Show Answer Correct Answer: C) Neutral. 19. Which of the following subatomic particles has/have the largestmass? A) Proton. B) Electron. C) Neutron. D) Proton and Neutron. Show Answer Correct Answer: D) Proton and Neutron. 20. The atomic mass is dependent on which two subatomic particles? A) Protons and electrons. B) Protons and neutrons. C) Neutrons and electrons. D) Electrons and the nucleus. Show Answer Correct Answer: B) Protons and neutrons. 21. Ag-110 and Ag-112 are two forms of silver with different mass, so they are: A) Compounds. B) Isotopes. C) Orbitals. D) Neutrons. Show Answer Correct Answer: B) Isotopes. 22. Which subatomic particles in the atom have no charge (they are neutral)? A) Proton. B) Electron. C) Neutron. D) None of the above. Show Answer Correct Answer: C) Neutron. 23. How is atomic mass impacted by isotopes? A) It is not impacted by isotopes. B) It is determined by adding the mass of all isotopes. C) It is determined by subtracting the mass of all isotopes. D) It is determined by averaging the mass of all isotopes. Show Answer Correct Answer: D) It is determined by averaging the mass of all isotopes. 24. Atoms of the same element with different numbers of neutrons are called A) Metalloids. B) Transition elements. C) Radioactive. D) Isotopes. Show Answer Correct Answer: D) Isotopes. 25. Rutherford called the region that deflected alpha particles A) An electron. B) A positron. C) A nucleus. D) A quark. Show Answer Correct Answer: C) A nucleus. ← 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 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