This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 10 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 10 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. States that, regardless of the amount, a compound is always composed of the same elements in the same proportion by mass A) Law of definite proportions. B) Law of conservation of mass. C) Law of multiple proportions. D) Periodic table. Show Answer Correct Answer: A) Law of definite proportions. 2. THE INDIVISIBILITY OF ATOM WAS PROPOSED A) Lavoisier. B) PROUST. C) RUTERFORD. D) DALTON. Show Answer Correct Answer: D) DALTON. 3. What is the main function of phloem in plants? A) Conduction water. B) Transport of food. C) Photosynthesis. D) Ascent of sap. Show Answer Correct Answer: B) Transport of food. 4. What is the volume of 5 moles of oxygen gas at room temperature? A) 112 dm$^{3}$. B) 112 cm$^{3}$. C) 120 L. D) 120 mL. Show Answer Correct Answer: C) 120 L. 5. How many elements occur naturally on Earth? A) 75. B) 100. C) 118. D) 94. Show Answer Correct Answer: D) 94. 6. Which of the following has highest number of protons? A) Carbon. B) Hydrogen. C) Manganese. D) Aluminium. Show Answer Correct Answer: C) Manganese. 7. Bill new compares atoms to A) Round objects. B) Letters of the alphabet. C) Cubes. D) Space. Show Answer Correct Answer: B) Letters of the alphabet. 8. ASSERTION:Water molecules always contain Hydrogen and Oxygen in the Ratio 1:8. REASON:Water obeys the law of i.e. proposed by dalton. A) A and R both are correct and R is correct explanation of A. B) A and R both are correct but R is not correct explanation of A. C) A is true but R is false. D) A is false but R is false. Show Answer Correct Answer: C) A is true but R is false. 9. Mole can be represented through ..... and ..... A) Mass and number of particles. B) Mass and atomic mass. C) Molecular mass and Atomic mass. D) None of the above. Show Answer Correct Answer: A) Mass and number of particles. 10. Which tissue provides mechanical strength along with hardness to the plants? A) Parenchyma. B) Aerenchyma. C) Collenchyma. D) Sclerenchyma. Show Answer Correct Answer: D) Sclerenchyma. 11. Which substance does the cell wall in the husk of a coconut possess? A) Lignin. B) Cutin. C) Suberin. D) Pectin. Show Answer Correct Answer: A) Lignin. 12. Who laid the foundation of chemical services by establishing 2 important laws of chemical combination? A) Dalton. B) Avagadro. C) Antoine Lavoisier. D) Democritus. Show Answer Correct Answer: C) Antoine Lavoisier. 13. When you heat matter, what happens to the atoms and molecules? A) They move faster. B) They move slower. C) They stop moving. D) They stay the same. Show Answer Correct Answer: A) They move faster. 14. The chemical formula of Aluminium Sulphate is: A) At $ _ {2} $ (so $ _ {4} $) $ _ {3} $. B) At $ _ {3} $ (so $ _ {4} $) $ _ {2} $. C) AlSO$_{4}$. D) Al (so $ _ {4} $) $ _ {2} $. Show Answer Correct Answer: A) At $ _ {2} $ (so $ _ {4} $) $ _ {3} $. 15. Who gave the name "atom" A) Democritus. B) Neil Bohr. C) Rutherford. D) Avagadro. Show Answer Correct Answer: A) Democritus. 16. One gram atom of oxygen is equal to A) 2g. B) 16g. C) 12g. D) None. Show Answer Correct Answer: B) 16g. 17. Hydrargyrum is the Latin name of ..... A) Iron. B) Mercury. C) Tin. D) Tungsten. Show Answer Correct Answer: B) Mercury. 18. How many moles are 98.3 grams of aluminum hydroxide, Al(OH)$_{3}$? (Atomic mass of Al = 27, H= 1, O = 16) A) 1.26 moles. B) 0.8 moles. C) 7, 673.4 moles. D) 150 moles. Show Answer Correct Answer: A) 1.26 moles. 19. How many times an atom of sulphur is heavier than an atom of carbon? A) 32 times. B) 8/3 times. C) 12 times. D) 2 times. Show Answer Correct Answer: B) 8/3 times. 20. In a reaction A + B $\rightarrow$ C, reactant A has 5g and product C has 9g. How many grams does reactant B should have? A) Hgum. B) 5g. C) Yag. D) 14g. Show Answer Correct Answer: A) Hgum. 21. "Total mass of the products formed in chemical reaction is exactly equal to the total mass of the reactants present in it." is a ..... A) Law of constant proportion. B) Law of multiple proportion. C) Law of conservation of mass. D) All the above. Show Answer Correct Answer: C) Law of conservation of mass. 22. What part of an atom is NEGATIVELY charged? A) Protons. B) Neutrons. C) Electrons. D) Atoms. Show Answer Correct Answer: C) Electrons. 23. What is the atomicity of Sulphur A) 4. B) 2. C) 1. D) 8. Show Answer Correct Answer: D) 8. 24. Who named indivisible particles as 'atoms'? A) The heels of Maharish. B) John Dalton. C) Proust. D) Democritus. Show Answer Correct Answer: D) Democritus. 25. We generally calculate the formula unit mass for the ionic compounds. (True/False) A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. ← 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 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books