Class 8 Science — Chapter 9: Friction
72 practice questions · 24 Easy · 24 Medium · 24 Hard
Practise Class 8 Science Chapter 9, "Friction", with 72 NCERT-aligned multiple-choice questions. The set is split into 24 Easy, 24 Medium and 24 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.
"Friction" 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 Friction, 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 8 Science mastery score. A few sample questions are shown below; sign in free to practise all 72.
Key concepts: Friction (Class 8 Science)
This chapter covers friction — its causes, types, advantages and disadvantages, and ways to increase or reduce it.
- Friction
- A force that opposes relative motion between surfaces in contact; it acts opposite to the applied motion.
- Cause of friction
- Irregularities (roughness) of the two surfaces interlocking; smoother surfaces have less friction.
- Types of friction
- Static (before motion), sliding and rolling friction; static > sliding > rolling for the same surfaces.
- Advantages & disadvantages
- Friction lets us walk, write and grip, but also wears out parts and wastes energy as heat.
- Changing friction
- Increased by treading/grooving; reduced by lubricants, polishing and ball bearings (rolling); fluid friction is called drag.
💡 Exam tips for Friction
- Rolling friction is much smaller than sliding friction — that's why wheels and ball bearings are used.
- Lubricants and a streamlined shape reduce friction (and drag in fluids).
Sample questions
Friction is a force that:
Friction opposes the relative motion between surfaces in contact.
How does oil reduce friction between two metal parts?
The oil layer separates the surfaces and smooths the irregularities, lowering friction.
Assertion (A): It is easier to keep a box moving than to start it moving. Reason (R): Sliding friction is slightly less than static friction. Choose the correct option.
Once moving, the smaller sliding friction needs less force than the larger static friction — R explains A.
Friction — FAQs
What are the key concepts in Class 8 Science Friction?+
This chapter covers friction — its causes, types, advantages and disadvantages, and ways to increase or reduce it. Key ideas include Friction, Cause of friction, Types of friction, Advantages & disadvantages, Changing friction.
What does Class 8 Science Chapter 9 (Friction) cover on XamBaaz?+
It covers 72 NCERT-aligned MCQs on "Friction" — 24 Easy, 24 Medium and 24 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams.
Are these "Friction" questions free to practise?+
Yes — sign in with Google to practise "Friction" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Friction" 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.
Practise all 72 questions free
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