Atoms and MoleculesPractice Questions & MCQs
Practice Atoms and Molecules questions for Class 9 Science - important MCQs and practice questions with answers and step-by-step solutions. Solve the sample Atoms and Molecules questions below, then get the full set free on the RankByte app.
Topics covered
Practice Atoms and Molecules by topic
Focused MCQ quizzes for each topic.
Atoms and MoleculesQuiz - Solve & Score
A few sample questions with instant answers and solutions - the full set is in the app.
Q1. Which postulate of Dalton's atomic theory directly explains the law of conservation of mass?
- A.atoms are neither created nor destroyed in a chemical reaction
- B.atoms of different elements have different masses
- C.atoms combine in small whole-number ratios
- D.atoms are divisible into electrons
Answer: A. atoms are neither created nor destroyed in a chemical reaction
Q2. Which postulate of Dalton's theory explains the law of constant proportions?
- A.atoms combine in a fixed, simple whole-number ratio in a given compound
- B.atoms are neither created nor destroyed
- C.atoms are indivisible
- D.all matter is made of atoms
Answer: A. atoms combine in a fixed, simple whole-number ratio in a given compound
Q3. Which observation would VIOLATE the law of constant proportions if it were ever found true?
- A.pure water samples with different hydrogen-to-oxygen mass ratios
- B.all pure water having the same 1:8 H:O ratio
- C.mass being conserved in a reaction
- D.excess reactant remaining unreacted
Answer: A. pure water samples with different hydrogen-to-oxygen mass ratios
Practice the full Atoms and Molecules set on RankByte
Step-by-step solutions, real mock tests, live National & School ranks and daily streaks - free to start.
Get early accessAtoms and Molecules - Frequently asked questions
Where can I find Atoms and Molecules practice questions for Class 9 Science?
RankByte has chapter-wise and topic-wise Atoms and Molecules practice questions and MCQs for Class 9 Science, each with the correct answer and a step-by-step solution - free to start.
Are these Atoms and Molecules questions important for the exam?
Yes. These Atoms and Molecules important questions follow the Science exam pattern (CBSE Boards, plus JEE and NEET foundation), so they help with both school and competitive prep.
Do the Atoms and Molecules questions come with answers and solutions?
Every Atoms and Molecules question on RankByte comes with the correct answer and a full step-by-step solution, so you learn from each one instead of just guessing.
More Class 9 Science chapters
Atomic Foundations of Matter
Interactive quiz · step solutions
Practice →Describing Motion Around Us
Interactive quiz · step solutions
Practice →Diversity in Living Organisms
Interactive quiz · step solutions
Practice →Earth as a System
Interactive quiz · step solutions
Practice →Force and Laws of Motion
Interactive quiz · step solutions
Practice →Gravitation
Interactive quiz · step solutions
Practice →