This quiz works best with JavaScript enabled. Home > Cbse > Class 9 > Science > Atoms And Molecules > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the relative atomic mass of Carbon? A) 18. B) 7. C) 12. D) 6. Show Answer Correct Answer: C) 12. 2. What is the atomic mass of chlorine? A) 35.5d. B) Grate. C) 30.2 u. D) 35.5 u. Show Answer Correct Answer: D) 35.5 u. 3. Which term defines a substance that is formed by the combination of elements using fixed amounts? A) Element. B) Compounds compound. C) Molecule. D) Atom. Show Answer Correct Answer: B) Compounds compound. 4. Mass of 1 mole of ethane (C$_{2}$H$_{6}$) is A) 30 g. B) 30 u. C) 30. D) None. Show Answer Correct Answer: A) 30 g. 5. "Atoms combine in fixed ratio to form compounds." This statement is supported by: A) Law of conservation of mass. B) Law of definite proportion. C) All the above. D) None of the above. Show Answer Correct Answer: B) Law of definite proportion. 6. The flow of electrons from one atom to another is A) Light. B) Energy. C) Heat. D) Electricity. Show Answer Correct Answer: D) Electricity. 7. How many atoms are in TWO H2O molecules? A) 8. B) 6. C) 2. D) 4. Show Answer Correct Answer: B) 6. 8. Atomic number of oxygen is A) 12. B) 8. C) 4. D) 6. Show Answer Correct Answer: B) 8. 9. What are the building blocks of all matter A) Atoms. B) Molecules. C) Both A and B. D) Only A. Show Answer Correct Answer: C) Both A and B. 10. Modern day of chemical symbols follow whose rules? A) IUPAC(International union for pure and applied chemistry). B) Dalton. C) Berzelius. D) None of these. Show Answer Correct Answer: A) IUPAC(International union for pure and applied chemistry). 11. Which of the following statement is not correct?1. atoms are neutral2. atoms are basic units of matter3. atoms aggregate to form large molecules4.atoms exist indepedently A) 3. B) 4. C) 2. D) 1. Show Answer Correct Answer: B) 4. 12. All matter is made of A) Compounds. B) Atoms. C) Electrons. D) Energy. Show Answer Correct Answer: B) Atoms. 13. Where is the proton found? A) Orbit. B) Nucleus. C) All the above. D) None of the above. Show Answer Correct Answer: B) Nucleus. 14. The smallest particle of a substance is ..... A) Molecule. B) Compound. C) Atom. D) Element. Show Answer Correct Answer: C) Atom. 15. In the video, what 2 important components is the Universe made up of? A) Water & air. B) Land & water. C) Atoms & molecules. D) Legos & kinetics. Show Answer Correct Answer: C) Atoms & molecules. 16. The valence electrons present in Neon are A) 6. B) 2. C) 1. D) 8. Show Answer Correct Answer: D) 8. 17. How many molecules are in 2.00 moles of H$_{2}$O? A) 12.04 x10$^{23}$ molecules H$_{2}$O. B) 1.20x10$^{23 }$molecules of H$_{2}$O. C) 124. D) 124x10$^{24 }$molecules of H$_{2}$O. Show Answer Correct Answer: A) 12.04 x10$^{23}$ molecules H$_{2}$O. 18. Heaviest particle in the atom is? A) Proton. B) Electron. C) Neutron. D) None of the above. Show Answer Correct Answer: C) Neutron. 19. H$_{2}$SO$_{4 contains how many atoms?}$ A) 3. B) 7. C) 4. D) 6. Show Answer Correct Answer: B) 7. 20. The repeating structure of table salt is in the shape of a A) Cube. B) Miscellaneous. C) Cone/. D) Sphere. Show Answer Correct Answer: A) Cube. 21. Which of the following is the correct pair of atom and it's atomic symbol? A) Sodium-S. B) Potassium-p. C) Sulphur-Sul. D) Phosphorus-P. Show Answer Correct Answer: D) Phosphorus-P. 22. Identify the Symbol of Calcium A) Ca. B) Na. C) Mg. D) Cl. Show Answer Correct Answer: A) Ca. 23. A mole of Neon contains 6.02 x 10$^{23 }$ ..... A) Molecules. B) Atoms. C) Ions. D) Formula units. Show Answer Correct Answer: B) Atoms. 24. Charges of Neutron, Electron and Proton are? A) 0 +-. B) -+ 0. C) 0-+. D) + 0-. Show Answer Correct Answer: C) 0-+. 25. Q6) KCl molecule is made up of which of the following ions? A) A) K cation and Cl anion. B) B) K anion and Cl cation. C) C) Both K and Cl cations. D) Both K and Cl anions. Show Answer Correct Answer: A) A) K cation and Cl anion. 26. The ratio of atomic mass between Hydrogen and Oxygen in Water molecule is? A) 1:8. B) 10:16. C) 8:1. D) 2:10. Show Answer Correct Answer: A) 1:8. 27. The atomicity of Magnesium molecule is A) 3. B) 2. C) 1. D) 0. Show Answer Correct Answer: C) 1. 28. The atomicity of rhombic sulfur is A) 4. B) 2. C) 1. D) 8. Show Answer Correct Answer: D) 8. 29. How would O2 be qualified. Check all answers that apply. A) Atom. B) Molecule. C) Compound. D) None of the above. Show Answer Correct Answer: B) Molecule. 30. What is the smallest unit of an element that retains its chemical properties? A) Ion. B) Molecule. C) Atom. D) Compound. Show Answer Correct Answer: C) Atom. 31. Q3) The number of atoms present in one molecule of an element is called as: A) Molecules. B) Atomicity. C) Empirical formula. D) Compound. Show Answer Correct Answer: B) Atomicity. 32. The Latin name of water is ..... A) Oxy. B) Hello. C) Hydro. D) None of the above. Show Answer Correct Answer: C) Hydro. 33. Valency of helium is A) 1. B) 2. C) 3. D) 0. Show Answer Correct Answer: D) 0. 34. The symbol of chlorine is A) Cl. B) CL. C) Chl. D) CL. Show Answer Correct Answer: A) Cl. 35. Who proposed Law of constant proportion? A) Neil's Bohr. B) Joseph L Proust. C) Lavoisier. D) John Dalton. Show Answer Correct Answer: B) Joseph L Proust. 36. Number of protons, electrons and neutrons in Oygen? A) 8 6 6. B) 6 8 8. C) 8 8 8. D) 8 8 6. Show Answer Correct Answer: C) 8 8 8. 37. Which concept is defined as the number of atoms in one mole of a substance? A) Mole. B) Molecular Mass. C) Avogadro's Number. D) Atomic Mass. Show Answer Correct Answer: C) Avogadro's Number. 38. What does the empirical formula represent? A) Number of molecules in a compound. B) Actual number of atoms in a molecule. C) Total number of atoms in a molecule. D) Simplest whole-number ratio of atoms in a compound. Show Answer Correct Answer: D) Simplest whole-number ratio of atoms in a compound. 39. ) Valency of Ferric is A) 4. B) 3. C) 1. D) 2. Show Answer Correct Answer: B) 3. 40. An atom that has a charge is called ..... A) A neutron. B) An ion. C) A proton. D) An element. Show Answer Correct Answer: B) An ion. 41. Q5) Which one of the following is modern symbol of Gold? A) A) by. B) B) at. C) Q) Al. D) D) ai. Show Answer Correct Answer: B) B) at. 42. Which of the following isthe correct relationship between number of moles, number of particles and avagadros number A) Number of moles= number of particles / avagadros number. B) Number of moles= avagadros number / number of particles. C) Number of moles= number of particles x avagadros number. D) Number of moles= number of particles x 1/avagadros number. Show Answer Correct Answer: A) Number of moles= number of particles / avagadros number. 43. What is the location of intercalary meristem? A) At the base of the leaves. B) Inside the Trachea. C) On the lateral side of plant organ. D) At growing tips of stem or roots. Show Answer Correct Answer: A) At the base of the leaves. 44. "n" and "m" in a numerical indicates A) Number of moles and Molar mass. B) Number of moles and given mass. C) Mass and number of moles. D) None of the above. Show Answer Correct Answer: B) Number of moles and given mass. 45. In Dalton's Atomic Theory, all elements consist of ..... that cannot be divided. A) Hydrogen. B) Atoms. C) Parts. D) Molecules. Show Answer Correct Answer: B) Atoms. 46. Mass of 0.5 mole of CO2 is A) 44gm. B) Dawn. C) 55gm. D) 22 gm. Show Answer Correct Answer: D) 22 gm. 47. Which of the following represents the correct chemical formulae? A) NaS. B) $B IPO_4$. C) Nax. D) Cock. Show Answer Correct Answer: B) $B IPO_4$. 48. The formula of baking powder A) Na2so4. B) Diversity. C) $ _ {NA2 CO3} $. D) NaHCO3. Show Answer Correct Answer: D) NaHCO3. 49. Pencil lead is made of ..... A) Hydrogen. B) Oxygen. C) Iron. D) Carbon. Show Answer Correct Answer: D) Carbon. 50. Where are electrons found? A) The nucleus. B) Orbiting the nucleus. C) Next to the neutrons. D) The proton. Show Answer Correct Answer: B) Orbiting the nucleus. 51. The ..... has a negative charge. A) Electron. B) Neutron. C) Positron. D) Proton. Show Answer Correct Answer: A) Electron. 52. Symbol of Atomic number is? A) N. B) A. C) S. D) Z. Show Answer Correct Answer: D) Z. 53. Chemical formula of aluminium and hydrogen is A) AL(OH)2. B) Aloh. C) Aloh. D) Al(OH)3. Show Answer Correct Answer: D) Al(OH)3. 54. What is an element? A) An molecule with an unequal distribution of charge. B) Two atoms bonded together. C) Two or more different types of atoms bonded together. D) A pure substance that cannot be broken down. Show Answer Correct Answer: D) A pure substance that cannot be broken down. 55. Molecular Mass of Glucose (C$_{6}$H$_{12}$O$_{6}$). A) 0.8809 gram/Mole(Approx). B) 180 grams/Mole(Approx). C) 100 grams/Mole(Approx). D) 110 grams / Mole (Approx). Show Answer Correct Answer: B) 180 grams/Mole(Approx). 56. Who have the theory of constant proportion A) Avogadro. B) Proust. C) Lavoisier. D) Lussa. Show Answer Correct Answer: B) Proust. 57. Smallest particle of matter called ..... A) Tiny particle. B) Tiny molecule. C) Molecule. D) Atom. Show Answer Correct Answer: D) Atom. 58. What is the atomic mass of carbon? A) 16 amu. B) 12 amu. C) 1 amu. D) 18 amu. Show Answer Correct Answer: B) 12 amu. 59. Molecular mass is defined as the: A) Mass of one molecule of any substance compared with the mass of one atom of C-12. B) Mass of one atom compared with the mass of one atom of hydrogen. C) Mass of one atom compared with the mass of one molecule. D) All of the above. Show Answer Correct Answer: A) Mass of one molecule of any substance compared with the mass of one atom of C-12. 60. An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be: A) Wood $ _ {2} $. B) Wood $ _ {2} $. C) XY$_{4}$. D) XY. Show Answer Correct Answer: A) Wood $ _ {2} $. Next →Related QuizzesScience QuizzesClass 9 QuizzesClass 9 Science Chapter 3 Atoms And Molecules Quiz 2Class 9 Science Chapter 3 Atoms And Molecules Quiz 3Class 9 Science Chapter 3 Atoms And Molecules Quiz 4Class 9 Science Chapter 3 Atoms And Molecules Quiz 5Class 9 Science Chapter 3 Atoms And Molecules Quiz 6Class 9 Science Chapter 3 Atoms And Molecules Quiz 7 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books