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Important Questions

Atomic Foundations of Matter

CBSE · Class 9 · Science

Most important questions from Atomic Foundations of Matter for CBSE Class 9 Science board exam 2026. MCQs, short answer, and long answer questions with marks.

83 questions84 flashcards5 concepts

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A diagram illustrating two objects with masses M and m, separated by a distance d, showing the gravitational force of attraction between their centers and the relevant variables.
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83 Questions·
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Sample Questions

1multiple choice
3 marks

In a closed reaction, 4.0 g calcium carbonate reacts with 2.92 g hydrochloric acid. What is the total mass of reactants?

Show answer

6.92 g

Add the reactant masses: 4.0 g + 2.92 g = 6.92 g.

2multiple choice
3 marks

A reaction gives 1.76 g carbon dioxide, 0.72 g water and 4.44 g calcium chloride. What is the difference between total product mass and total reactant mass if the reactants weighed 6.92 g?

Show answer

0 g

Total products = 1.76 + 0.72 + 4.44 = 6.92 g. Total reactants = 6.92 g. The difference is 0 g.

3multiple choice
3 marks

Water is decomposed into hydrogen and oxygen. If 18 g water is decomposed, how much oxygen is obtained?

Show answer

16 g

From 9 g water, 1 g hydrogen and 8 g oxygen are obtained. Doubling to 18 g water gives 2 g hydrogen and 16 g oxygen.

4multiple choice
3 marks

If 24 g carbon reacts completely with oxygen, how much carbon dioxide is formed?

Show answer

88 g

From 12 g carbon, 44 g carbon dioxide is formed. 24 g carbon is double 12 g, so carbon dioxide is double 44 g, which is 88 g.

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Frequently Asked Questions

What are the important topics in Atomic Foundations of Matter for CBSE Class 9 Science?
Key topics in Atomic Foundations of Matter include Chapter 9 Gravitation — Complete Concept Map, Gravitation Chapter — Complete Concept Map, Chapter 9 Gravitation — Concept Overview. These are the concepts CBSE Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Atomic Foundations of Matter — CBSE Class 9 Science?
Understand the core concepts first, then work through the 83 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Atomic Foundations of Matter?
There are 83 practice questions available for Atomic Foundations of Matter. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All 13 chapters — CBSE Class 9 Science Important Questions

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