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MCQ Science and Technology Class 9 Chapter 4 Maharashtra Board

Measurement of Matter

1. What is the main principle of Dalton’s atomic theory regarding the formation of compounds?

Question 1 of 20

2. Who discovered the law of conservation of matter?

Question 2 of 20

3. What does the law of constant proportion state?

Question 3 of 20

4. What is the proportion by mass of hydrogen to oxygen in water?

Question 4 of 20

5. What is the proportion by mass of carbon to oxygen in carbon dioxide?

Question 5 of 20

6. Which scientist is considered the father of modern chemistry?

Question 6 of 20

7. What is the molecular formula of common salt?

Question 7 of 20

8. What is the molecular formula of slaked lime?

Question 8 of 20

9. What is the molecular formula of limestone?

Question 9 of 20

10. In Activity 1, what is the expected observation when 56 g of calcium oxide reacts with 18 g of water?

Question 10 of 20

11. What is the atomic radius of an atom defined as?

Question 11 of 20

12. What is the unit used to express atomic radius?

Question 12 of 20

13. What is the approximate size relationship between a meter and a nanometer?

Question 13 of 20

14. Which instrument is mentioned for obtaining an image of iridium atoms?

Question 14 of 20

15. What primarily determines the mass of an atom?

Question 15 of 20

16. What are protons and neutrons collectively called?

Question 16 of 20

17. What was initially chosen as the reference atom for relative atomic mass?

Question 17 of 20

18. What is the relative atomic mass of a hydrogen atom on the initial scale?

Question 18 of 20

19. What is the relative atomic mass of a nitrogen atom compared to hydrogen?

Question 19 of 20

20. What is the current reference atom for relative atomic mass?

Question 20 of 20

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