This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 4 Structure Of The Atom – Quiz 9 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 4 Structure Of The Atom Quiz 9 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which experiment led to the discovery of protons? A) Cathode Rays Experiment. B) Anode Rays Experiment. C) Canal Rays Experiment. D) $\alpha$-ray Scattering Experiment. Show Answer Correct Answer: C) Canal Rays Experiment. 2. A patient is diagnosed of having cancer. Which isotope is used to treat the patient? A) Carbon-14. B) Sudoom-24. C) Phosphorus-32. D) Cobalt-60. Show Answer Correct Answer: D) Cobalt-60. 3. Which of the following correctly represent the electronic distribution in the Mg atom? A) 3, 8, 1. B) 2, 8, 2. C) 1, 8, 3. D) 8, 2, 2. Show Answer Correct Answer: B) 2, 8, 2. 4. One of the first ideas about the makeup of matter was ..... A) It's made of small, indestructible spheres. B) It's made of fire, water, earth, and air. C) It has a nucleus and an electron cloud. D) None of the above. Show Answer Correct Answer: B) It's made of fire, water, earth, and air. 5. Which of the following elements contains the greatest amount of protons? A) Lithium. B) Oxygen. C) Calcium. D) Hydrogen. Show Answer Correct Answer: C) Calcium. 6. Protons are present in A) Outside the nucleus of an atom. B) Inside the nucleus of an atom. C) They keep changing their position. D) None of the above. Show Answer Correct Answer: B) Inside the nucleus of an atom. 7. Do electrons contribute to the mass of an atom? A) No. B) It depends on the element. C) Yes. D) It depends on the number of electrons. Show Answer Correct Answer: A) No. 8. Bohr discovered that electrons are located in A) The nucleus. B) Inside protons. C) Electron cloud. D) Circular orbits around the nucleus. Show Answer Correct Answer: D) Circular orbits around the nucleus. 9. $Ag_{47}^{108}$ A) 47, 61, 47. B) 108, 61, 108. C) 47, 108, 47. D) 60, 47, 60. Show Answer Correct Answer: A) 47, 61, 47. 10. What is the number of electrons in the valence shell of boron (B)? A) 1. B) 0. C) 3. D) 2. Show Answer Correct Answer: C) 3. 11. An atom of chlorine-37 has 17 electrons. How many neutrons does an atom of chlorine-37 contain? A) 17. B) 20. C) 37. D) 54. Show Answer Correct Answer: B) 20. 12. Which of the following is the best evidence that the particles that make up a cathode ray had a negative charge? A) The particles were produced by many different metals. B) The ray was deflected toward a positive electric field. C) Line emission spectra for an element are always the same. D) The ray caused a phosphorescent screen to glow. Show Answer Correct Answer: B) The ray was deflected toward a positive electric field. 13. A pure sample of ammonia contains 14 g of nitrogen and 3 grams of hydrogen. A second sample of pure ammonia contains 28 g nitrogen and 6 g of hydrogen. This is an example of the A) Law of universal gravitation. B) Law of multiple proportions. C) Law of definite proportions. D) Law of mass action. Show Answer Correct Answer: C) Law of definite proportions. 14. . Subatomic particles that are neutral in charge A) Nucleus. B) Electrons. C) Protons. D) Neutrons. Show Answer Correct Answer: D) Neutrons. 15. In the Bohr model of the atom, electrons are said to move in specific paths around the nucleus. What are these paths called? A) Orbits. B) Shells. C) Clouds. D) Fields. Show Answer Correct Answer: A) Orbits. 16. Value representing the number of protons in an element A) Atomic Number. B) Valence Electrons. C) Mass Number. D) None of the above. Show Answer Correct Answer: A) Atomic Number. 17. What is the default charge of an element on the periodic table? A) Neutral. B) Negative. C) It varies. D) Positive. Show Answer Correct Answer: A) Neutral. 18. Why was the Thomson's Model of an atom failed?i. It could not explain the screening of negative charges from that of positiveii. It did not tell about the presence of electronsiii. It did not give an idea about the discrete energy levelsiv. It explained the atom as a whole to be electrically neutralChoose the correct option from the following: A) Only (iii). B) Both (i) & (iii). C) Only (i). D) Both (ii) & (iv). Show Answer Correct Answer: B) Both (i) & (iii). 19. Protons and ..... are found in the nucleus. A) Protons. B) Neutrons. C) Electrons. D) +1. E) -1. Show Answer Correct Answer: B) Neutrons. 20. The process when liquid water from earth's surface changes to water vapor. A) Condensation. B) Evaporation. C) Precipitation. D) Runoff. Show Answer Correct Answer: B) Evaporation. 21. He proposed the first formal atomic theory of the atom. A) John Dalton. B) JJ Thomson. C) Niels Bohr. D) Ernest Rutherford. Show Answer Correct Answer: A) John Dalton. 22. The atomic number of sodium (Na) is 11. How many valence electrons does sodiumhave? A) (a) 1. B) B) 2. C) (c) 7. D) (d) 8. Show Answer Correct Answer: A) (a) 1. 23. All atoms of the same element have the same ..... A) Number of protons. B) Number of neutrons. C) Mass number. D) Mass. Show Answer Correct Answer: A) Number of protons. 24. An atom with 3 protons and 4 neutrons will have a valency of A) 3. B) 7. C) 1. D) 4. Show Answer Correct Answer: C) 1. 25. Protons and ..... have a relative mass of 1. A) Protons. B) Neutrons. C) Electrons. D) +1. E) -1. Show Answer Correct Answer: B) Neutrons. ← 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 10Class 9 Science Chapter 4 Structure Of The Atom Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books