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 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 4 Structure Of The Atom Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In E. Goldstein' experiment the rays found was known as A) Canal rays. B) UV rays. C) X-rays. D) Sun rays. Show Answer Correct Answer: A) Canal rays. 2. What is the significance of the atomic number in the periodic table? A) It represents the number of protons in the nucleus of an atom. B) It represents the number of electrons in the atom. C) It determines the reactivity of the element. D) It indicates the mass of the atom. Show Answer Correct Answer: A) It represents the number of protons in the nucleus of an atom. 3. What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete? A) They both will weigh the same. B) The product always weighs more than the reactant. C) The reactant will weigh more than the product. D) They both will loose mass after the reaction. Show Answer Correct Answer: A) They both will weigh the same. 4. An atom of an element with atomic number 48 and massnumber 120 contains ..... A) 48 protons, 48 electrons, and 72 neutrons. B) 72 protons, 48 electrons, and 48 neutrons. C) 120 protons, 48 electrons, and 72 neutrons. D) 72 protons, 72 electrons, and 48 neutrons. Show Answer Correct Answer: A) 48 protons, 48 electrons, and 72 neutrons. 5. Who discovered the Sub atomic particle Proton A) J.J Thomson. B) Rutherford. C) E.Goldstein. D) J.chadwick. Show Answer Correct Answer: C) E.Goldstein. 6. Electrons have ..... charge. A) Positive. B) Negative. C) No. D) None of the above. Show Answer Correct Answer: B) Negative. 7. Do Electrons Carry Positive or Negative Charges A) Positive. B) Negative. C) All the above. D) None of the above. Show Answer Correct Answer: B) Negative. 8. Which subatomic particles are much smaller than the others and have a negative charge? A) Proton. B) Electron. C) Neutron. D) None of the above. Show Answer Correct Answer: B) Electron. 9. The number after an element's name, representing the sum of its protons and neutrons A) Atomic mass unit. B) Atomic mass. C) Mass number. D) Atomic number. Show Answer Correct Answer: C) Mass number. 10. Which element has 31 protons? A) Gallium. B) Germanium. C) Gadolinium. D) Polonium. Show Answer Correct Answer: A) Gallium. 11. Deuterium and Tritium are A) Isotopes. B) Isobars. C) Isotones. D) None of the above. Show Answer Correct Answer: A) Isotopes. 12. There are ..... types of atomic orbitals. A) 4. B) 1. C) 3. D) 2. Show Answer Correct Answer: A) 4. 13. 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. 14. 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. 15. Carbon has a atomic number of 6. Calculate the number neutrons in C-14. A) 14. B) 6. C) 7. D) 8. Show Answer Correct Answer: D) 8. 16. All matter is made of what? A) Energy. B) Electrons. C) Compounds. D) Atoms. Show Answer Correct Answer: D) Atoms. 17. 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. 18. 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 no protons. D) Hydrogen-2 has three protons. Show Answer Correct Answer: B) Hydrogen-3 has two neutrons. 19. Protium, Deuterium, and Tritium are types of ..... A) Isomer. B) Isotone. C) Isobar. D) Isotope. Show Answer Correct Answer: D) Isotope. 20. Which model of an atom places electrons on energy levels/shells? A) Bell model. B) Newton model. C) Bohr model. D) Rutherford model. Show Answer Correct Answer: C) Bohr model. 21. 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) Nucleus. B) Electron. C) Proton. D) Neutron. Show Answer Correct Answer: B) Electron. 22. An atom has a mass number of 23 and atomic number 11. The number of protons is ..... A) 12. B) 44. C) 11. D) 23. Show Answer Correct Answer: C) 11. 23. Subatomic particles with a negative charge A) Electrons. B) Neutrons. C) Quarks. D) Protons. Show Answer Correct Answer: A) Electrons. 24. Which of the following is true for any atom? A) Atomic number = number of neutrons = number of electrons. B) Atomic number = number of protons = 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: B) Atomic number = number of protons = number of electrons. 25. What is the charge of a proton? A) Negative. B) Neutral. C) Positive. D) It varies. Show Answer Correct Answer: C) Positive. 26. 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. 27. What is the lightest subatomic particle? A) Proton. B) Electron. C) Neutron. D) Atom. Show Answer Correct Answer: B) Electron. 28. What is the maximum number of electrons that can be accommodated in the M shell? A) 32. B) 18. C) 2. D) 8. Show Answer Correct Answer: B) 18. 29. Who discovered the proton A) Chadwik. B) Rutherford. C) E. Goldstein. D) J. J. Thomson. Show Answer Correct Answer: C) E. Goldstein. 30. What is the charge of a neutron? A) Positive. B) Negative. C) Neutral. D) None of the above. Show Answer Correct Answer: C) Neutral. 31. 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. 32. 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. 33. Ag-110 and Ag-112 are two forms of silver with different mass, so they are: A) Neutrons. B) Compounds. C) Orbitals. D) Isotopes. Show Answer Correct Answer: D) Isotopes. 34. 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. 35. 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. 36. 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. 37. Rutherford called the region that deflected alpha particles A) A nucleus. B) A quark. C) A positron. D) An electron. Show Answer Correct Answer: A) A nucleus. 38. What is the atomic number of an element? A) Number of molecules in the nucleus. B) Number of protons in the nucleus. C) Number of electrons in the nucleus. D) Number of neutrons in the nucleus. Show Answer Correct Answer: B) Number of protons in the nucleus. 39. Who was the scientist that revived the ancient idea of the atom? A) Democritus. B) Aristotle. C) Dalton. D) None of the above. Show Answer Correct Answer: C) Dalton. 40. Which element's isotope is used as fuel in nuclear reactor? A) Cobalt. B) Oxygen. C) Iodine. D) Uranium. Show Answer Correct Answer: D) Uranium. 41. What is the mass contribution of a proton? A) 2 you. B) 1amu. C) It varies. D) 0 knit. Show Answer Correct Answer: B) 1amu. 42. Atoms of the same element with different numbers of neutrons A) Nuclear equation. B) Isotope. C) Atom. D) Nucleus. Show Answer Correct Answer: B) Isotope. 43. Generally, in a ..... atom, the number of ..... is equal to the number of electrons. A) Neutral, protons. B) Negatively charged, neutrons. C) Positively charged, protons. D) Neutral, neutrons. Show Answer Correct Answer: A) Neutral, protons. 44. The mass of one Avogadro's number of N atoms is equal to A) 14 g. B) 14 u. C) 14 kg. D) 28 g. Show Answer Correct Answer: A) 14 g. 45. If the f block contains 14 columns, then it would make sense that an f orbital can hold up to ..... electrons. A) 14. B) 7. C) 5. D) 2. Show Answer Correct Answer: A) 14. 46. Calcium-42 has 20 protons. How many neutrons does calcium-42 have? A) 20. B) 22. C) 42. D) None of the above. Show Answer Correct Answer: B) 22. 47. Which of the following cannot be the maximum number of electrons in a given shellaccording to the Bohr & Bury's rule for electronic configuration: A) 6. B) 2. C) 32. D) 18. Show Answer Correct Answer: A) 6. 48. Cations have what type of charge? A) Positive. B) Negative. C) All the above. D) None of the above. Show Answer Correct Answer: A) Positive. 49. This particle determines what element you have-the elements identity. A) Electron. B) Proton. C) Valence shell. D) Neutron. Show Answer Correct Answer: B) Proton. 50. What is the mass number of an atom? A) The total number of protons and neutrons in the nucleus. B) The total number of protons in the nucleus. C) The total number of electrons in the atom. D) The total number of subatomic particles in the atom. Show Answer Correct Answer: A) The total number of protons and neutrons in the nucleus. 51. Protons have ..... charge. A) Positive. B) Negative. C) No. D) None of the above. Show Answer Correct Answer: A) Positive. 52. What is the maximum number of electrons that are allowed on the second orbital? A) 8. B) 7. C) 3. D) 9. Show Answer Correct Answer: A) 8. 53. The weighted average mass of the isotopes of that element A) Atomic mass unit. B) Atomic mass. C) Mass number. D) Atomic number. Show Answer Correct Answer: B) Atomic mass. 54. Which of the following is a p block element? A) Ca. B) Ar. C) Re. D) Au. Show Answer Correct Answer: B) Ar. 55. An element has 3 valence electrons in its outermost 3rd shell, the name of element is A) Ga. B) In. C) B. D) Al. Show Answer Correct Answer: D) Al. 56. What is the smallest part of matter that still retains the properties of its element? A) Atoms. B) Nucleus. C) Quarks. D) None of the above. Show Answer Correct Answer: A) Atoms. 57. The electron distribution in an aluminium atom is A) 2, 8, 2. B) 2, 8, 3. C) 8, 2, 3. D) 2, 3, 8. Show Answer Correct Answer: B) 2, 8, 3. 58. What principle states that no two electrons can have the same set of quantum numbers? A) Heisenberg uncertainty principle. B) Building Principle. C) Dog's Rule. D) Pauli exclusion principle. Show Answer Correct Answer: D) Pauli exclusion principle. 59. Atoms are the ..... building blocks A) Largest. B) Smallest. C) All the above. D) None of the above. Show Answer Correct Answer: B) Smallest. 60. Who discovered the existence of neutrons in the nucleus of an atom? A) Rutherford. B) Bohr. C) Chadwick. D) Goldstein. Show Answer Correct Answer: C) Chadwick. ← 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 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 6 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books