Class 9
Science
Chapter 9
Exploration (latest NCERT)
Atomic Foundations of Matter
Free NCERT practice questions for Class 9 Science, Chapter 9 — 89 questions across MCQs, short-answer, long-answer, numericals and more. Download a printable PDF worksheet in seconds. No signup, no ads, no paywall.
Sample questions from this chapter
Here are 6 real questions students will encounter when they generate a worksheet for this chapter. Every question includes the answer.
MCQ
Medium
1 mark
A compound always contains the same elements in a fixed ratio by mass. This is the law of:
(a) Conservation of mass
(b) Definite proportions
(c) Avogadro
(d) Gay-Lussac
Answer: Definite proportions
Short Answer
Medium
3 marks
Differentiate between an ionic bond and a covalent bond.
Answer: • Ionic bond: formed by transfer of electrons; one atom loses, another gains.
• Covalent bond: formed by sharing of electrons between atoms.
Fill in the Blank
Medium
1 mark
Formula unit mass is the sum of atomic masses in a formula unit of an __________ compound.
Answer: ionic
Numerical
Medium
3 marks
Find the formula unit mass of ammonium nitrate, NH₄NO₃. (N=14, H=1, O=16)
Answer: • N: 2×14 = 28
• H: 4×1 = 4
• O: 3×16 = 48
• Total = 28+4+48 = 80 u.
Very Short
Medium
2 marks
Write the chemical formulae: (i) aluminium nitrate, (ii) calcium oxide, (iii) ferric oxide.
Answer: • (i) Aluminium nitrate = Al(NO₃)₃
• (ii) Calcium oxide = CaO
• (iii) Ferric oxide = Fe₂O₃
True / False
Medium
1 mark
State True or False: An atom that gains electrons becomes a cation.
Answer: False. Gaining electrons forms an anion (negative ion).
Generate a worksheet with all 89 questions →
Frequently asked questions
What is included in Class 9 Science Chapter 9 (Atomic Foundations of Matter)?
This chapter has 89 NCERT-aligned practice questions covering all the concepts from the Exploration textbook's Chapter 9. Questions span easy, medium and hard levels across 10 different formats so students get a balanced practice set.
Are these questions based on the new NCERT Exploration textbook?
Yes. Every question on Practico for Class 9 Science is mapped directly to the latest NCERT Exploration textbook (the one CBSE schools are using now). The chapter numbers and chapter titles match the textbook exactly.
How many questions can I practice from this chapter?
89 questions are available right now. You can pick how many you want at a time — generate 10 quick MCQs, a 30-question worksheet, or a full exam-style mix. Each generation gives you a different random set.
Can I download a free PDF worksheet for Atomic Foundations of Matter?
Yes — completely free, no sign-up required. Pick this chapter, choose the number of questions and types you want, and download a printable PDF (with or without answers) in one click.
What question types are available?
This chapter has assertion reason, fill blank, image, long, match, mcq, numerical, short, true false, very short. You can mix any combination, or filter to just the type you want to practice — for example, only numericals to drill calculation, or only short-answer questions for exam revision.
Is Practico aligned with CBSE exam patterns?
Yes. Practico questions are tagged by marks (1, 2, 3, 5) and by difficulty (Easy/Medium/Hard) just like CBSE exam blueprints, so you can build a worksheet that mirrors a real unit test or annual exam.