This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 9 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 9 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. One Atomic mass unit= ..... A) Mass of one atom of oxygen. B) 1/16 th mass of one atom of natural carbon. C) 1/12 th mass of natural carbon. D) 1/12 th mass of one atom of carbon-12 isotope. Show Answer Correct Answer: D) 1/12 th mass of one atom of carbon-12 isotope. 2. If Element A has more atomic mass than Element B, then gram molar mass of Element A is more than gram molar mass of Element B. (True/False) A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 3. Neutrons are ..... particles. A) Negative. B) Positive. C) Neutral. D) Cows. Show Answer Correct Answer: C) Neutral. 4. A substance made of only one kind of atom is a/an ..... A) Compound. B) Atom. C) Molecule. D) Element. Show Answer Correct Answer: D) Element. 5. Which one of the following is a triatomic molecule A) Glucose. B) Helium. C) Carbon dioxide. D) Hydrogen. Show Answer Correct Answer: C) Carbon dioxide. 6. Number of atoms in one molecule A) Molecules unit. B) Atomic unit. C) Electronic unit. D) All of above. Show Answer Correct Answer: B) Atomic unit. 7. Chlorine has two kind of atoms, Cl-35 and Cl-36. In both cases atomic number of chlorine is 17. Which brought the change? A) No of electrons. B) No of neutrons. C) No of protons. D) None of the above. Show Answer Correct Answer: B) No of neutrons. 8. What is the neutron? 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: B) A neutral particle found in the nucleus. 9. What is an ion? A) A charged atom. B) An atom with different neutrons. C) Atoms with no protons. D) Atoms with no electrons. Show Answer Correct Answer: A) A charged atom. 10. "In a compound, the elements always present in the fixed ratio of their mass." is a ..... A) Law of constant proportion. B) Law of conservation of mass. C) Law of multiple proportion. D) None of the above. Show Answer Correct Answer: A) Law of constant proportion. 11. Which statement is true for an anion A) They are negatively charged ions. B) They always gain electron and have electrons more than a normal atom. C) Both a and b. D) They are neutrals. Show Answer Correct Answer: C) Both a and b. 12. Write the chemical symbol for:I. Zinc II. Carbon III. HydrogenIV. Helium V. Copper A) I. ZN II.CI II.HEAVE.a v. c. B) I.ZN II.I.HEAVE.A v. c. C) I.ZN II.I.HEAVE.A v. c. D) Use. Show Answer Correct Answer: B) I.ZN II.I.HEAVE.A v. c. 13. 1 MOLE OF COMPOUND IS EQUAL TO A) N$_{0}$. B) ATOMIC NUMBER. C) DENSITY. D) NONE OF THE ABOVE. Show Answer Correct Answer: A) N$_{0}$. 14. A molecule is the smallest particle of an ..... A) Compound. B) Element. C) Compound and element. D) None of the above. Show Answer Correct Answer: A) Compound. 15. Atomic mass represented in grams is called as ..... A) Gram atomic mass(GAM). B) Gram molecular mass (GMM). C) Molar mass. D) None of the above. Show Answer Correct Answer: A) Gram atomic mass(GAM). 16. What do we call a chemical substance made up of 2 or more different types atoms bonded together? A) Formula. B) Atom. C) Subscript. D) Compound. Show Answer Correct Answer: D) Compound. 17. Mass of One mole is equal to A) Two gram atom. B) One molecule gram atom. C) One gram atom. D) All of these. Show Answer Correct Answer: C) One gram atom. 18. The atomic numbers of 3 elements A, B and C are 9, 10 and 13 respectively. Which ofthem will form a cation. A) A. B) B. C) C. D) None of the above. Show Answer Correct Answer: C) C. 19. Who proposed Law of Conservation of mass? A) Proust. B) Dalton. C) Democrats. D) Lavoisier. Show Answer Correct Answer: D) Lavoisier. 20. Substances that have only one kind of atom are called: A) Nitrogen. B) Nucleus. C) Elements. D) Electrons. Show Answer Correct Answer: C) Elements. 21. Atomic mass unit is equal to the: A) Mass of 1/12th of C-14 atom. B) Mass of 1/12th of C-13 atom. C) Mass of 1/12th of C-12 atom. D) None of the above. Show Answer Correct Answer: C) Mass of 1/12th of C-12 atom. 22. The value of Avogadro's number is A) 6.022 x 10$^{21}$. B) 6.022 x 10$^{22}$. C) 6.022 x 10$^{23}$. D) 6.023 x 10$^{22}$. Show Answer Correct Answer: C) 6.022 x 10$^{23}$. 23. Which of the following is a chemical formula? A) H$_{2}$SO$_{4}$. B) And. C) Hg. D) C. Show Answer Correct Answer: A) H$_{2}$SO$_{4}$. 24. Plasma exists in form of A) Both B and C. B) Ions. C) Free electrons. D) None. Show Answer Correct Answer: A) Both B and C. 25. The atomicity of K2Cr2O7 is A) 9. B) 11. C) 10. D) 10. Show Answer Correct Answer: B) 11. ← 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 10Class 9 Science Chapter 3 Atoms And Molecules Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books