This quiz works best with JavaScript enabled. Home > Cbse > Class 9 > Science > Atoms And Molecules > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 7 (47 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the proton? A) A neutral particle that orbits the nucleus. B) A neutral particle found in the nucleus. C) A positively charged particle found in the nucleus. D) A negatively charged particle that orbits the nucleus. Show Answer Correct Answer: C) A positively charged particle found in the nucleus. 2. A group of atoms carrying fixed charge on them is called ..... A) Cation. B) Diatomic ions. C) Polyatomic ions. D) Monoatomic ions. Show Answer Correct Answer: C) Polyatomic ions. 3. Which law states that mass can neither be created nor be destroyed? A) LAW OF CONSTANT PROPORTION. B) LAW OF MULTIPLE PROPORTION. C) LAW OF CONSERVTION OF MASS. D) LAW OF CONSTANT PROPORTION. Show Answer Correct Answer: C) LAW OF CONSERVTION OF MASS. 4. An atom has 4 protons. How many electrons does it have if the atom has a-1 charge? A) 4. B) 6. C) 5. D) 3. Show Answer Correct Answer: C) 5. 5. In Rutherford experiment $\alpha$-particle has charge equal to A) +1. B) +2. C) +3. D) +4. Show Answer Correct Answer: B) +2. 6. Atomic mass can be best defined as: A) 1/15th the mass of an oxygen atom. B) 1/13th the mass of a carbon atom. C) 1/12th the mass of a carbon atom. D) 1/16th the mass of an oxygen atom. Show Answer Correct Answer: C) 1/12th the mass of a carbon atom. 7. An Indian sage who postulated the atom in his VISHESIKA SUTRA was ..... A) Maharishi's sympathy. B) Maharishi Kashapa. C) Maharishi's sympathy idea d Kashapa, that shark. D) None of the above. Show Answer Correct Answer: C) Maharishi's sympathy idea d Kashapa, that shark. 8. When elements combine they form A) Salt. B) Compounds. C) Elements. D) Atoms. Show Answer Correct Answer: B) Compounds. 9. ..... combine together to form molecules. A) Mixtures. B) Compounds. C) Pikmon. D) Atoms. Show Answer Correct Answer: D) Atoms. 10. Which one of these items is not a solid with a repeating pattern?Calculate the relative molecular mass of H2S. A) 64 a.m.u. B) 16 a.m.u. C) 18 a.m.u. D) 34 a.m.u. Show Answer Correct Answer: D) 34 a.m.u. 11. The central region of an atom where its neutrons and protons are is called it's ..... A) Core. B) Center. C) Nucleus. D) Electron cloud. Show Answer Correct Answer: C) Nucleus. 12. The Latin name of Potassium is ..... A) Sodium. B) Potassium. C) Plum bum. D) None of the above. Show Answer Correct Answer: B) Potassium. 13. The positive particles of an atom are called ..... A) Electrons. B) Atoms. C) Neutrons. D) Protons. Show Answer Correct Answer: D) Protons. 14. Thickening of suberin chemical on the wall of sclerenchyma cells makes them impermeable to air and water. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 15. Valency of Hydrogen is ..... A) 2. B) 3. C) 1. D) 4. Show Answer Correct Answer: C) 1. 16. The mass of one atom of oxygen is A) 8g. B) 16g. C) $\frac{\left(16\right)}{\left(6.022\times10^{23}\right)}g$. D) $\frac{\left(32\right)}{\left(6.022\times10^{23}\right)}g$. Show Answer Correct Answer: C) $\frac{\left(16\right)}{\left(6.022\times10^{23}\right)}g$. 17. What is the molar mass of CO$_{2}$$_{}$? A) 22.0 g/mol. B) 28.0 g/mol. C) 56.0 g/mol. D) 44.0 g/mol. Show Answer Correct Answer: D) 44.0 g/mol. 18. In ammonia NH$_{3, Nitrogen and Hydrogen are in the ratio ..... by mass.}$ A) 14:3. B) 14:2. C) 14:5. D) 14:8. Show Answer Correct Answer: A) 14:3. 19. A change in the physical state can be brought about A) Only when energy is taken out from the system. B) Only when energy is given to the system. C) Without any energy change. D) When energy is either given to or taken out from the system. Show Answer Correct Answer: D) When energy is either given to or taken out from the system. 20. In a compound such as water, the ratio of the mass of hydrogen to the mass of oxygen is always ..... , whatever the source of water. A) 1:8. B) 1:9. C) 14:6. D) 8:1. Show Answer Correct Answer: A) 1:8. 21. How many times heavier is one atom of carbon than the atom of oxygen A) 1.33. B) 1.5. C) 1.25. D) 1.23. Show Answer Correct Answer: A) 1.33. 22. If an element gains one or more electrons, it became A) Positively charged. B) Negatively charged. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Negatively charged. 23. What happens to electrons during ionic bonding? A) Each atom loses an electron. B) They are shared between the 2 atoms. C) They are transferred from one atom to another. D) Each atom takes only one electron each. Show Answer Correct Answer: C) They are transferred from one atom to another. 24. The idea of divisibility of matter was given by A) Maharishi kanad. B) Democritus. C) On slayama. D) Antoine Lavoisier. Show Answer Correct Answer: A) Maharishi kanad. 25. Mass can neither be created nor destroyed. it is a ..... A) Mass recreation. B) Law of conservation. C) Law of conservation of mass. D) Mass is cannot reform. Show Answer Correct Answer: C) Law of conservation of mass. 26. The number of electrons present in the 'L' shell of O is A) 4. B) 6. C) 3. D) 5. Show Answer Correct Answer: B) 6. 27. Atomic number of hydrogen is A) 7. B) 3. C) 1. D) 5. Show Answer Correct Answer: C) 1. 28. What is the atomic number? A) The number of protons. B) The number of protons and neutrons. C) The number of neutrons. D) The number of protons and electrons. Show Answer Correct Answer: A) The number of protons. 29. All matter is composed of A) Electrons. B) Atoms. C) Energy. D) Compounds. Show Answer Correct Answer: B) Atoms. 30. Molecules can be termed as? (Generally) *Choose the most appropriate option- A) Cluster of Atoms. B) Cluster of Mixtures. C) Cluster of Compounds. D) Cluster of Elements. Show Answer Correct Answer: A) Cluster of Atoms. 31. The particles that are found in the nucleus of an atom are A) Neutrons and electrons. B) Electrons only. C) Protons and neutrons. D) Protons and electrons. Show Answer Correct Answer: C) Protons and neutrons. 32. Which scientist developed the atomic theory? A) JJ Thomson. B) John Dalton. C) James Chadwick. D) Ernest Rutherford. Show Answer Correct Answer: B) John Dalton. 33. What is the definition of law of constant proportion? A) The law of constant proportions states that chemical compounds are made up of elements that are present in a fixed ratio by atomic number. B) It is based on atomic mass. C) The law of constant proportions states that chemical compounds are made up of elements that are present in a fixed ratio by mass. D) Use. Show Answer Correct Answer: C) The law of constant proportions states that chemical compounds are made up of elements that are present in a fixed ratio by mass. 34. Which of the following represents a molecule? A) $H_2O$. B) $ Na^+$. C) $O_2$. D) $Cl^-$. Show Answer Correct Answer: A) $H_2O$. 35. The valency of nitogen in NH3 A) 1. B) 4. C) 3. D) 2. Show Answer Correct Answer: C) 3. 36. The relative atomic mass of Cl is A) 37. B) 37 u. C) 35.5. D) 35.5 u. Show Answer Correct Answer: C) 35.5. 37. B + B $\rightarrow$ $B_2$ A) Molecule of an element. B) Molecule of a compound. C) All the above. D) None of the above. Show Answer Correct Answer: A) Molecule of an element. 38. Element with atomic number 104 was discovered simultaneously by the Americans and Russians. The Russian scientists proposed the name 'Kurchatovium' and the American scientists suggested the name 'Rutherfordium' for the new element. In such a dispute, which organization they should go to: A) International Court of Justice. B) Royal Society of Chemistry. C) International Union of Pure and Applied Chemistry. D) Association of Chemistry Teachers. Show Answer Correct Answer: C) International Union of Pure and Applied Chemistry. 39. The symbol of Mercury is taken from its latin name: A) Silver. B) Copper. C) Stibium. D) Hydrargyrum. Show Answer Correct Answer: D) Hydrargyrum. 40. ..... come together to form all the matter around us. A) Atoms. B) Compounds. C) Use. D) Elements. Show Answer Correct Answer: A) Atoms. 41. WHCH OF THE FOLLOWING IS NOT CORRECTLY MATCHED1. PHOSPHATE-PO$_{4}$$^{3-}$2. NO$_{3}$$^{-}$ NITRIDE3. SO$_{4}$$^{2-}$ SULPHATE4. HYDRIDE-H$^{-}$ A) 2. B) 3. C) 4. D) 1. Show Answer Correct Answer: A) 2. 42. An Indian sage who postulated the atom in his VISHESIKA SUTRA A) Maharishi kanad. B) Maharishi Kashapa. C) Maharishi kanad and kasyapa. D) None of the above. Show Answer Correct Answer: C) Maharishi kanad and kasyapa. 43. Number of moles present in 28 gm of Nitrogen atoms are A) 1. B) 4. C) 2. D) 3. Show Answer Correct Answer: C) 2. 44. What is the mass of i)0.2 mole of oxygen atom? A) 45g. B) 320.0G. C) 3.2g. D) 32g. Show Answer Correct Answer: C) 3.2g. 45. Atomicity of phosphorus namaste is A) Monoatomic. B) Tetra atomic. C) Diatomic. D) Poly atomic. Show Answer Correct Answer: B) Tetra atomic. 46. 1 MOLE OF ANY SUBSTANCE = ..... OF THE SUBSTANCE A) Atomic/Molecular mass in grams. B) Atomic/ Molecular mass in amu. C) All the above. D) None of the above. Show Answer Correct Answer: A) Atomic/Molecular mass in grams. 47. Can atoms of same element have different masses A) Both b and c. B) No. C) Yes. D) None. Show Answer Correct Answer: C) Yes. ← PreviousRelated QuizzesScience QuizzesClass 9 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 6 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books