Friction — Class 8 MCQs with Answers
Class 8 CBSE Science · Chapter 109
Pre-2026 syllabusThis chapter is from the older NCERT book. See the 2026-27 Class 8 Science chapters →
72 practice questions · 24 Easy · 24 Medium · 24 Hard · Updated
Jump to the 6 solved questions
Practise the most important Class 8 CBSE Science questions from Chapter 109, "Friction". You get 6 timed quizzes made from 72 NCERT-based MCQs, with answers and explanations. The questions are split into 24 Easy, 24 Medium and 24 Hard. Warm up on the basics, then move on to the exam-level questions that top scorers in CBSE Board exams get right.
To score well in "Friction", focus on clear concepts in physics, chemistry and biology basics. Each MCQ here is timed and uses exam-style marking (+4 correct, −1 wrong, 0 skipped). This helps you stay accurate when time is short, just as real papers need. Every question has a short explanation, so a wrong answer becomes a quick lesson. It is the fastest way to fix gaps before a test.
Use this chapter for focused revision. Start with the Easy set to check your basics on Friction, then move to Medium and Hard to practise applying them. Your accuracy, streaks and XP save automatically. This chapter also adds to your overall Class 8 Science mastery score. Try the 6 sample questions below: tap an option to see the answer and a worked explanation. Sign in free to start practising.
Friction — important questions & MCQs with answers (Class 8 Science)
6 solved questions from this chapter's difficulty levels, each with its answer and explanation. Tap an option to check yourself.
0 of 6 answered
- Q1 of 6Easy
Friction is a force that:
Show answerHide answer
Answer: Opposes the motion of objects
Explanation: Friction opposes the relative motion between surfaces in contact.
- Q2 of 6Easy
A rough surface produces ____ friction than a smooth surface.
Show answerHide answer
Answer: More
Explanation: Rougher surfaces have more interlocking irregularities, so they produce more friction.
- Q3 of 6Medium
Why is friction called a 'necessary evil'?
Show answerHide answer
Answer: It is needed for walking, writing and braking, but it also wears out parts and wastes energy
Explanation: Friction is essential for everyday tasks, yet it also causes wear and heat loss — a necessary evil.
- Q4 of 6Medium
How does oil reduce friction between two metal parts?
Show answerHide answer
Answer: It fills the irregularities and forms a thin layer that keeps the surfaces slightly apart
Explanation: The oil layer separates the surfaces and smooths the irregularities, lowering friction.
- Q5 of 6Hard
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.
Show answerHide answer
Answer: Both A and R are true and R explains A
Explanation: Once moving, the smaller sliding friction needs less force than the larger static friction — R explains A.
- Q6 of 6Hard
A skydiver falls faster after jumping, then slows on opening the parachute. The parachute slows the fall because it:
Show answerHide answer
Answer: Greatly increases air drag (fluid friction) by presenting a large area
Explanation: The big parachute area sharply increases air drag, balancing gravity and slowing the descent.
Friction notes: key concepts (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.
Start this chapter free
You have 6 to try above. Sign in with Google (no card needed). You get 1 Easy + 1 Medium quiz on every chapter, free for good (up to 6 quizzes a day) — plus a free Hard quiz when you score 70%+ on a Medium quiz (1 per subject), and the exam tips.
This chapter has 72 questions (24 Easy · 24 Medium · 24 Hard), with timed scoring and instant feedback. The rest unlock with the ₹999/year plan.
Start with the questions above. The full quiz opens here after.
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 109 (Friction) cover on XamBaaz?+
It has 72 NCERT-based MCQs on "Friction": 24 Easy, 24 Medium and 24 Hard. Together they make 6 timed quizzes, and you never get the same set twice. Every question has an instant explanation. They help you prepare 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. One year from the day you pay. You stay in Class 8 till 31 March; on 1 April your account moves up to Class 9 and the rest of your year carries over. No chapter is charged separately.
How should I revise "Friction" for the exam?+
Start with the Easy quiz to check your basics, then try Medium and Hard to practise applying them. There are 6 timed quizzes on this chapter, so you can come back for a fresh set instead of one you have seen. Read each explanation, retry the questions you miss, and track your accuracy until it stays high.
Are these "Friction" MCQs available with answers?+
Yes. 6 sample questions are on this page with answers: tap an option, or "Show answer", to see the correct option and a step-by-step explanation. Sign in free with Google to start practising, with instant scoring.
Is there negative marking in the "Friction" quizzes?+
Yes. The timed quizzes use exam-style marking: +4 for a right answer, −1 for a wrong one and 0 for a skip. MHT-CET and CBSE board papers have no negative marking. Our mocks for those are scored their way.
What are the important questions from Friction (Class 8 Science)?+
The questions that matter most test Friction, Cause of friction, Types of friction, Advantages & disadvantages, Changing friction. This page shows 6 solved important MCQs with answers and explanations. Sign in to practise all 72 questions on the chapter as timed quizzes.
Is there an online quiz for Friction?+
Yes — Class 8 Science Friction has timed online quizzes at Easy, Medium and Hard levels, with instant scoring and a worked explanation on every question. The first quiz on the chapter is free.
Are there question answers and extra questions for Friction (Class 8 Science)?+
Yes. This page has 6 solved questions on Friction, each with the correct answer and a short explanation. Sign in to practise all 72 questions on the chapter as timed quizzes.