This set contains 50 carefully curated MCQs covering the fundamental concepts of Atoms and Molecules as per NCERT/JKBOSE/CBSE Class 9 Chemistry syllabus. The questions focus on the historical development of atomic theory, laws of chemical combination, Dalton's atomic theory, and basic concepts of atoms and molecules. These questions test conceptual understanding and are designed to build a strong foundation for competitive examinations.
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📘 SCIENCE
CHEMISTRY | Atoms & Molecules-A
📝 Questions: 50
⏱️ Timer: 20 min
Q1. Ancient philosophers wondered about:
Q2. The idea of divisibility of matter in India dates back to around:
Q3. The Indian philosopher who proposed divisibility of matter was:
Q4. Maharishi Kanad used the term for matter as:
Q5. According to Maharishi Kanad, continuous division of matter leads to:
Q6. The smallest indivisible particles were named:
Q7. Parmanu refers to particles that:
Q8. Which philosopher elaborated Kanad's doctrine?
Q9. According to Pakudha Katyayama, particles normally exist in:
Q10. Combined particles give rise to:
Q11. Greek philosophers who proposed indivisible particles were:
Q12. Greek philosophers suggested matter division will finally produce:
Q13. Democritus named indivisible particles as:
Q14. The word atom means:
Q15. Early ideas about atoms were based on:
Q16. Experimental validation of atomic ideas was not possible till:
Q17. By the end of the eighteenth century, scientists recognized the difference between:
Q18. Scientists became interested in:
Q19. Antoine L. Lavoisier laid the foundation of:
Q20. Lavoisier established:
Q21. The laws established by Lavoisier are related to:
Q22. Which scientist worked along with Lavoisier on laws of chemical combination?
Q23. The law stating mass is neither created nor destroyed is called:
Q24. Law of conservation of mass applies to:
Q25. During a chemical reaction, mass:
Q26. Many compounds are composed of:
Q27. In a compound, elements are present in:
Q28. The mass ratio of hydrogen to oxygen in water is:
Q29. If 9 g of water is decomposed, hydrogen obtained is:
Q30. Oxygen obtained from 9 g of water is:
Q31. In ammonia, nitrogen and hydrogen are present in the mass ratio:
Q32. The mass ratio in ammonia is independent of:
Q33. The law stating fixed mass proportions in compounds is called:
Q34. Law of constant proportions is also known as:
Q35. The law of definite proportions was stated by:
Q36. According to Proust, elements in a compound are present:
Q37. Scientists needed explanations for:
Q38. The British chemist who explained these laws was:
Q39. Dalton provided the basic theory about:
Q40. Dalton adopted the idea of:
Q41. Dalton used the term:
Q42. According to Dalton, the smallest particles of matter are:
Q43. Dalton's theory was based on:
Q44. Dalton's atomic theory explained:
Q45. Dalton's atomic theory also explained:
Q46. Ancient Indian ideas about atoms were:
Q47. Greek philosophers proposed atomic ideas during:
Q48. The word 'atom' was taken by Dalton from:
Q49. Lavoisier's work marked the beginning of:
Q50. The smallest indivisible particle concept was common to:
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