This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 15 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 15 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. John Dalton stated: A) Elements are made of atoms. B) Atoms of a given element are identical. C) Atoms cannot be subdivided, created, nor destroyed. D) All of the above. Show Answer Correct Answer: D) All of the above. 2. The ratio of of H and O in H2O by mass is A) 1:9. B) 1:8. C) 1:7. D) 1:6. Show Answer Correct Answer: B) 1:8. 3. Which of the following is tetra atomic A) Oxygen. B) Sulphur. C) Potassium. D) Phosphorus. Show Answer Correct Answer: D) Phosphorus. 4. The bonding capacity of an element is called ..... A) Atomic number. B) Atomic Mass Unit. C) Molecular mass. D) Valency. Show Answer Correct Answer: D) Valency. 5. Which cell may be up to 1 m long? A) Nerve cell. B) Non-striated ( unstriated). C) Cardiac muscle cell. D) Collagen fibre cell. Show Answer Correct Answer: A) Nerve cell. 6. Atomic mass is? A) Proton + Neutron. B) Proton + Neutron + electron. C) Proton + Electron. D) Electron + Neutron. Show Answer Correct Answer: A) Proton + Neutron. 7. The symbol of Gold is ..... A) G. B) Ag. C) Au. D) Go. Show Answer Correct Answer: C) Au. 8. Identify Nitrogen gas A) N. B) NO. C) N$_{2}$. D) 2N. Show Answer Correct Answer: C) N$_{2}$. 9. How many atoms are contained in 25 g of NaBr? (Atomic mass of Na = 23, Br = 35) A) 102.96 molecules. B) 0.24 molecules. C) 1.45x10$^{23}$ molecules. D) 2.34 x 10$^{20}$molecules. Show Answer Correct Answer: C) 1.45x10$^{23}$ molecules. 10. 1 u or 1 amu means A) 1/12th mass of C-12 atoms. B) Mass of C-12 atom. C) Mass of O-16 atom. D) Mass of Hydrogen molecule. Show Answer Correct Answer: B) Mass of C-12 atom. 11. Calcium and oxygen are present in which of the following compounds? A) Baking Soda. B) Hydrogen Bromide. C) Quick Lime. D) Potassium Sulphate. Show Answer Correct Answer: C) Quick Lime. 12. Which law states that in a chemical substance the elements are always present in definite proportion by mass and given by ..... A) Law of conservation of mass, Proust. B) Law of constant proportion, Lavosier. C) Law of constant proportion, Proust. D) None of the above. Show Answer Correct Answer: C) Law of constant proportion, Proust. 13. What are the basic building blocks for all matter? A) Atoms. B) Elements. C) Compounds. D) Chemicals. Show Answer Correct Answer: A) Atoms. 14. Law of constant proportion is also referred to as law of definite proportion A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 15. The law of conservation of mass states that ..... A) The total mass of reactants is more than the total mass of products. B) The mass of a chemical reaction is not constant. C) The mass of a chemical reaction remains constant. D) The total mass of reactants is less than the total mass of products. Show Answer Correct Answer: C) The mass of a chemical reaction remains constant. 16. The symbol for the metal used in thermometer. A) Ag. B) Hg. C) Mg. D) Sg. Show Answer Correct Answer: B) Hg. 17. ..... is the smallest particle that takes part in a chemical reaction. A) Molecule. B) Compound. C) Atoms. D) Ion. Show Answer Correct Answer: C) Atoms. 18. Who was the English Chemist that developed the Atomic Theory? A) Democritus. B) John Dalton. C) Socrates. D) James Bond. Show Answer Correct Answer: B) John Dalton. 19. What is the chemical name of CsI? A) Cesium Monoiodide. B) Carbon Sulfide Iodide. C) Cesium Iodide. D) Carbon Silicate. Show Answer Correct Answer: C) Cesium Iodide. 20. What is the proton? A) A negatively charged particle that orbits the nucleus. B) A neutral particle found in the nucleus. C) A positively charged particle found in the nucleus. D) A neutral particle that orbits the nucleus. Show Answer Correct Answer: C) A positively charged particle found in the nucleus. 21. A group of atoms carrying fixed charge on them is called ..... A) Monoatomic ions. B) Diatomic ions. C) Polyatomic ions. D) Cation. Show Answer Correct Answer: C) Polyatomic ions. 22. Which law states that mass can neither be created nor be destroyed? A) LAW OF MULTIPLE PROPORTION. B) LAW OF CONSERVTION OF MASS. C) LAW OF CONSTANT PROPORTION. D) LAW OF CONSTANT PROPORTION. Show Answer Correct Answer: B) LAW OF CONSERVTION OF MASS. 23. 1 u = A) 1.66 x 10$^{-24}$ Kg. B) 1.66 x 10$^{-24}$ g. C) 1.66 x 10$^{-27}$ g. D) 1.66 x 10$^{-21}$ Kg. Show Answer Correct Answer: B) 1.66 x 10$^{-24}$ g. 24. An atom has 4 protons. How many electrons does it have if the atom has a-1 charge? A) 6. B) 5. C) 4. D) 3. Show Answer Correct Answer: B) 5. 25. In Rutherford experiment $\alpha$-particle has charge equal to A) +1. B) +3. C) +4. D) +2. Show Answer Correct Answer: D) +2. ← PreviousNext →Related QuizzesClass 9 Science Chapter 3 Atoms And Molecules Quiz 1Class 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 7Class 9 Science Chapter 3 Atoms And Molecules Quiz 8Class 9 Science Chapter 3 Atoms And Molecules Quiz 9Class 9 Science Chapter 3 Atoms And Molecules Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books