Class 9 Science — Chapter 5: Force and Laws of Motion
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Practise Class 9 Science Chapter 5, "Force and Laws of Motion", with 90 NCERT-aligned multiple-choice questions. The set is split into 30 Easy, 30 Medium and 30 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams and the JEE & NEET foundation years.
"Force and Laws of Motion" is one of the chapters where concept clarity across physics, chemistry and biology basics really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Force and Laws of Motion, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 9 Science mastery score. A few sample questions are shown below; sign in free to practise all 90.
Key concepts: Force and Laws of Motion (Class 9 Science)
This chapter introduces the cell as the basic unit of life, comparing prokaryotic and eukaryotic cells and describing the structure and function of cell organelles.
- Cell theory
- All living organisms are made of cells; the cell is the basic structural and functional unit of life; all cells arise from pre-existing cells.
- Prokaryotic vs eukaryotic
- Prokaryotic cells (e.g. bacteria) lack a true nucleus and membrane-bound organelles; eukaryotic cells have both.
- Plasma membrane & cell wall
- The plasma membrane is selectively permeable, controlling movement by diffusion and osmosis; plant cells also have a rigid cellulose cell wall.
- Osmosis
- Movement of water across a semi-permeable membrane: cells swell in hypotonic, stay normal in isotonic, and shrink (plasmolyse) in hypertonic solutions.
- Nucleus & organelles
- The nucleus controls activities and holds DNA; mitochondria release energy; chloroplasts do photosynthesis; ER, Golgi, lysosomes and vacuoles have specific roles.
- Cell organelle roles
- Mitochondria = 'powerhouse'; lysosomes = 'suicide bags'; Golgi apparatus packages and dispatches materials.
💡 Exam tips for Force and Laws of Motion
- Plant cells have a cell wall, large central vacuole and chloroplasts; animal cells do not — a common compare-and-contrast question.
- Remember osmosis directions: hypotonic → cell swells, hypertonic → cell shrinks.
Sample questions
Newton's first law of motion is also called the law of:
Objects resist changes in motion — law of inertia.
F = ma is the mathematical form of:
Newton's 2nd law: F = rate of change of momentum = ma.
A 2 kg ball accelerates from 0 to 10 m/s in 5 s. Force applied =
a = 10/5 = 2 m/s². F = ma = 2 × 2 = 4 N.
Force and Laws of Motion — FAQs
What are the key concepts in Class 9 Science Force and Laws of Motion?+
This chapter introduces the cell as the basic unit of life, comparing prokaryotic and eukaryotic cells and describing the structure and function of cell organelles. Key ideas include Cell theory, Prokaryotic vs eukaryotic, Plasma membrane & cell wall, Osmosis, Nucleus & organelles.
What does Class 9 Science Chapter 5 (Force and Laws of Motion) cover on XamBaaz?+
It covers 90 NCERT-aligned MCQs on "Force and Laws of Motion" — 30 Easy, 30 Medium and 30 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams and the JEE & NEET foundation years.
Are these "Force and Laws of Motion" questions free to practise?+
Yes — sign in with Google to practise "Force and Laws of Motion" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Force and Laws of Motion" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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