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 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 4 Structure Of The Atom Quiz 4 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A high-speed electron with a 1-charge that is emitted during radioactive decay A) Alpha particle. B) Beta particle. C) Beta radiation. D) Gamma ray. Show Answer Correct Answer: B) Beta particle. 2. When an electron absorbs enough energy, it jumps up to a higher level. This is called A) Relaxation state. B) Excitation state. C) Emission state. D) Absorption state. Show Answer Correct Answer: B) Excitation state. 3. Most of an atom is A) Dense. B) Empty. C) Fluid. D) The nucleus. Show Answer Correct Answer: B) Empty. 4. Which element would be most stable in nature? A) Element with 12 electrons. B) Element with 20 electrons. C) Element with 2 electrons. D) Element with 9 electrons. Show Answer Correct Answer: C) Element with 2 electrons. 5. Carbon is atomic number 6. What is the mass number of carbon-13? A) 6. B) 7. C) 13. D) None of the above. Show Answer Correct Answer: C) 13. 6. An atom of one of the isotopes of sodium contains:11 protons, 11 electrons and 13 neutrons.State the nucleon number of this isotope. A) 13. B) 35. C) 24. D) 11. Show Answer Correct Answer: C) 24. 7. Which scientist discovered the electrons? A) Bohr. B) Dalton. C) Thomson. D) Attractive. Show Answer Correct Answer: C) Thomson. 8. The sum of the protons and neutrons in an atom equals the ..... A) Number of electrons. B) Atomic number. C) Atomic mass. D) Mass number. Show Answer Correct Answer: D) Mass number. 9. What is the role of an electron in an atom? A) Electrons live inside the nucleus and carry a neutral charge. B) Electrons circle the nucleus and have a positive charge. C) Electrons circle the nucleus and have a negative charge. D) Electrons live inside the nucleus and have a negative charge. Show Answer Correct Answer: C) Electrons circle the nucleus and have a negative charge. 10. Thomson proposed the modal of an atom to be similar to A) Christmas Cake. B) Milk shake. C) Ice cream. D) Christmas Pudding. Show Answer Correct Answer: D) Christmas Pudding. 11. The no.of proton in an oxygen atom is A) 8. B) 2. C) 10. D) 6. Show Answer Correct Answer: A) 8. 12. How is Proton different from electron? A) An electron carries more charge than a proton. B) A proton can be easily removed from the atom, but not an electron. 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. 13. The mass number gives the number of ..... in the atom. A) Protons and neutrons. B) Protons and electrons. C) Electrons and neutrons. D) Neutrons. Show Answer Correct Answer: A) Protons and neutrons. 14. Which experiment led to the discovery of protons? A) Canal Rays Experiment. B) Anode Rays Experiment. C) $\alpha$-ray Scattering Experiment. D) Cathode Rays Experiment. Show Answer Correct Answer: A) Canal Rays Experiment. 15. A patient is diagnosed of having cancer. Which isotope is used to treat the patient? A) Sudoom-24. B) Carbon-14. C) Cobalt-60. D) Phosphorus-32. Show Answer Correct Answer: C) Cobalt-60. 16. Which of the following correctly represent the electronic distribution in the Mg atom? A) 1, 8, 3. B) 2, 8, 2. C) 8, 2, 2. D) 3, 8, 1. Show Answer Correct Answer: B) 2, 8, 2. 17. 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. 18. Which of the following elements contains the greatest amount of protons? A) Hydrogen. B) Oxygen. C) Lithium. D) Calcium. Show Answer Correct Answer: D) Calcium. 19. 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. 20. Do electrons contribute to the mass of an atom? A) Yes. B) No. C) It depends on the element. D) It depends on the number of electrons. Show Answer Correct Answer: B) No. 21. Bohr discovered that electrons are located in A) Circular orbits around the nucleus. B) The nucleus. C) Inside protons. D) Electron cloud. Show Answer Correct Answer: A) Circular orbits around the nucleus. 22. What is the number of electrons in the valence shell of boron (B)? A) 3. B) 2. C) 0. D) 1. Show Answer Correct Answer: A) 3. 23. 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. 24. Which of the following is the best evidence that the particles that make up a cathode ray had a negative charge? A) Line emission spectra for an element are always the same. B) The ray caused a phosphorescent screen to glow. C) The particles were produced by many different metals. D) The ray was deflected toward a positive electric field. Show Answer Correct Answer: D) The ray was deflected toward a positive electric field. 25. 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. 26. . Subatomic particles that are neutral in charge A) Protons. B) Electrons. C) Nucleus. D) Neutrons. Show Answer Correct Answer: D) Neutrons. 27. In the Bohr model of the atom, electrons are said to move in specific paths around the nucleus. What are these paths called? A) Shells. B) Fields. C) Clouds. D) Orbits. Show Answer Correct Answer: D) Orbits. 28. 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. 29. What is the default charge of an element on the periodic table? A) Negative. B) Positive. C) Neutral. D) It varies. Show Answer Correct Answer: C) Neutral. 30. 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). 31. Protons and ..... are found in the nucleus. A) Electrons. B) Protons. C) Neutrons. D) +1. E) -1. Show Answer Correct Answer: C) Neutrons. 32. The process when liquid water from earth's surface changes to water vapor. A) Evaporation. B) Precipitation. C) Runoff. D) Condensation. Show Answer Correct Answer: A) Evaporation. 33. He proposed the first formal atomic theory of the atom. A) Niels Bohr. B) JJ Thomson. C) Ernest Rutherford. D) John Dalton. Show Answer Correct Answer: D) John Dalton. 34. The atomic number of sodium (Na) is 11. How many valence electrons does sodiumhave? A) (d) 8. B) (c) 7. C) (a) 1. D) B) 2. Show Answer Correct Answer: C) (a) 1. 35. All atoms of the same element have the same ..... A) Mass. B) Number of protons. C) Number of neutrons. D) Mass number. Show Answer Correct Answer: B) Number of protons. 36. An atom with 3 protons and 4 neutrons will have a valency of A) 7. B) 3. C) 1. D) 4. Show Answer Correct Answer: C) 1. 37. Protons and ..... have a relative mass of 1. A) +1. B) Electrons. C) -1. D) Neutrons. E) Protons. Show Answer Correct Answer: D) Neutrons. 38. Who was known as the 'Father of nuclear physics' A) Rutherford. B) Dalton. C) Bohr. D) Thomson. Show Answer Correct Answer: A) Rutherford. 39. Which of the following substances is made up of ions? Which of the following materials is made up of ions? A) Zinc / Zink. B) Sodium chloride / Natrium klorida. C) Oxygen gas / Gas oksigen. D) Naphthalene / Naftalena. Show Answer Correct Answer: B) Sodium chloride / Natrium klorida. 40. Two isotopes of an element will have different numbers of WHAT subatomic particle? A) Protons. B) Neutrons. C) Electrons. D) None of the above. Show Answer Correct Answer: B) Neutrons. 41. Charge on Proton is A) Negative. B) Can be positive or negative. C) No charge. D) Positive. Show Answer Correct Answer: D) Positive. 42. An atom of element X has a nucleon number of 14. The electron arrangement of this atom is 2.4.Which of the following statements is true about an atom of element X that has a nucleon number of 13? A) The atoms has 3 valence electrons. B) The atoms has 7 protons. C) The electron arrangement of the atom is 2.4. D) The atom has 8 neutrons. Show Answer Correct Answer: C) The electron arrangement of the atom is 2.4. 43. If a neutral atom has 8 protons, how many electrons does it have? A) 9. B) 10. C) 7. D) 8. Show Answer Correct Answer: D) 8. 44. Which of these are parts of the atom? A) Neutrons, Protons, Electrons. B) Mitochondria, Electrons, Protons. C) Oxygen. D) Protons, ProAthletes, Neutrons. Show Answer Correct Answer: A) Neutrons, Protons, Electrons. 45. What does amu stand for? A) Atom matter unit. B) Atomic mass unit. C) All mighty unicorn. D) None of the above. Show Answer Correct Answer: B) Atomic mass unit. 46. Isobars have different number of? A) Protons. B) Electrons. C) Neutrons. D) Protons and Neutrons. Show Answer Correct Answer: D) Protons and Neutrons. 47. Which two particles make up the nucleus of an atom? A) Protons and Electrons. B) Protons and Neutrons. C) Molecules and Compounds. D) Neutrons and Electrons. Show Answer Correct Answer: B) Protons and Neutrons. 48. A chemical symbol represents the ..... of an element. A) Type. B) Name. C) Structure. D) Reaction. Show Answer Correct Answer: B) Name. 49. Which particle has almost no mass? A) Protons. B) Neutrons. C) Electrons. D) None of the above. Show Answer Correct Answer: C) Electrons. 50. 7 smallest part of an element that has all of the properties of that element. A) Gem. B) Atom. C) Mineral. D) Nucleus. Show Answer Correct Answer: B) Atom. 51. What is Carbons Atomic Number A) 6. B) 8. C) 89. D) 50. Show Answer Correct Answer: A) 6. 52. What is the maximum number of electrons that the second energy level of an atom can fit? A) Eight. B) Four. C) Six. D) Two. Show Answer Correct Answer: A) Eight. 53. How many electrons can the first energy level hold? A) 16. B) 2. C) 32. D) 8. Show Answer Correct Answer: B) 2. 54. How many electrons can the first energy level/shell hold? A) 1. B) 8. C) 4. D) 2. Show Answer Correct Answer: D) 2. 55. How would you calculate the number of neutrons in an atom A) Mass number-Total weight. B) Mass number-Atomic Number. C) Positive charge-Negative charge. D) Atomic number-Mass number. Show Answer Correct Answer: B) Mass number-Atomic Number. 56. The subatomic particles that make up neutrons and protons are called ..... A) Groupons. B) Nucleus. C) Mendelev. D) Quarks. Show Answer Correct Answer: D) Quarks. 57. If a carbon atom has six protons and has a mass of 13 amu, how many neutrons are in that carbon atom? A) 7. B) 8. C) 6. D) 5. Show Answer Correct Answer: A) 7. 58. Neils Bohr's atomic theory is similar to the concept of the A) Solar system. B) Circles with dots. C) Spinning wheel. D) None of the above. Show Answer Correct Answer: A) Solar system. 59. Which of the following represents the electron configuration of a metallic element? A) 2.5. B) 2.8.3. C) 2.8.7. D) 2.8. Show Answer Correct Answer: B) 2.8.3. 60. When a nucleus undergoes nuclear decay by gamma rays, the atomic number of the element ..... A) Remains the same. B) Increases by two. C) Increases by one. D) Decreases by one. Show Answer Correct Answer: A) Remains the same. ← 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 5Class 9 Science Chapter 4 Structure Of The Atom Quiz 6 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books