This quiz works best with JavaScript enabled. Home > Cbse > Class 8 > Science > Friction > Class 8 Science Chapter 12 Friction – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 8 Science Chapter 12 Friction Quiz 3 (48 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The force of fluid friction depends on A) Light fluid. B) Nature of the fluid. C) The quality of the object. D) Salty fluid. Show Answer Correct Answer: B) Nature of the fluid. 2. A body covers equal distances in equal intervals of time is called A) Uniform motion. B) Scalar quantity. C) Displacement. D) Non uniform motion. Show Answer Correct Answer: A) Uniform motion. 3. Why are the wheels of vehicles made circular? A) Rolling friction is less than sliding friction. B) As they fit easily in cars. C) They have grip. D) None of the above. Show Answer Correct Answer: A) Rolling friction is less than sliding friction. 4. How would the absence of friction affect a marble travelling on a long, straight path? A) The marble would remain at a constant speed. B) The marble would stop immediately. C) The marble's speed would increase. D) The marble's speed would decrease. Show Answer Correct Answer: A) The marble would remain at a constant speed. 5. If we apply oil on door hinges, the friction will A) Disappear altogether. B) Increase. C) Decrease. D) Will remain unchanged. Show Answer Correct Answer: C) Decrease. 6. Which of these could increase the friction between objects? A) Thick air molecules. B) A rough surface. C) A smooth surface. D) Water. Show Answer Correct Answer: B) A rough surface. 7. There are four types of friction. What are those four called? A) Sliding, rolling, static, and fluid. B) Slipping, sliding, falling, and fluid. C) Slipping, sliding, static, and flowing. D) None of the above. Show Answer Correct Answer: A) Sliding, rolling, static, and fluid. 8. Choose the disadvantage of friction A) Running on a ground. B) Writing on a paper by pen. C) Slipping on a banana peel. D) Lighting a matchstick. Show Answer Correct Answer: C) Slipping on a banana peel. 9. A submarine in water will experience ..... friction. A) Static. B) Air. C) Viscous. D) Rolling. Show Answer Correct Answer: C) Viscous. 10. A magnet cannot move which of the following objects? A) A staple. B) A nail. C) A paper clip. D) A toothpick. Show Answer Correct Answer: D) A toothpick. 11. Friction can be increased by making the surface A) Rough. B) Smooth. C) Does not depend on the nature of surface. D) None of these. Show Answer Correct Answer: A) Rough. 12. Aeroplanes have a ..... shape to reduce friction. A) Streamlined. B) Round. C) Spindle. D) Flat. Show Answer Correct Answer: A) Streamlined. 13. Friction happens because the microscopic hills and valleys of one surface get stuck on the hills and valleys of another surface. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 14. What is the effect of surface roughness on friction? A) Increases friction. B) Depends on the weight. C) Decreases friction. D) No effect. Show Answer Correct Answer: A) Increases friction. 15. The force that opposes the movement of a spoon through honey is ..... A) Rolling friction. B) Static friction. C) Drag. D) Sliding friction. Show Answer Correct Answer: C) Drag. 16. A force that slows or stops motion when objects rub together. A) Pull. B) Friction. C) Push. D) Magnetism. Show Answer Correct Answer: B) Friction. 17. Would it be possible to walk on the road or write with a pen without friction? A) Possible. B) Don't know. C) Not possible. D) None of the above. Show Answer Correct Answer: C) Not possible. 18. There are ..... types of friction. A) 5. B) 2. C) 4. D) 1. Show Answer Correct Answer: C) 4. 19. Why friction is a necessary evil? A) It causes wastage of chemicals. B) It causes wastage of time. C) It causes wastage of fuels. D) It causes wastage of energy. Show Answer Correct Answer: D) It causes wastage of energy. 20. To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable? A) Stone. B) Glass block. C) Wooden block. D) Plastic block. Show Answer Correct Answer: A) Stone. 21. Which of the following surfaces is safe to walk on? A) Ice skating ring. B) Paved footpath. C) Wet floor. D) Marble floor. Show Answer Correct Answer: B) Paved footpath. 22. Friction is always useful to us. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 23. The force of friction always acts on A) Stationary objects. B) Liquids. C) Solids. D) Moving objects. Show Answer Correct Answer: D) Moving objects. 24. Which of the following scenarios would likely result in the highest friction? A) Sliding a book on a table. B) Pushing a car on a smooth road. C) Rolling a ball on grass. D) Dragging a heavy box on a carpet. Show Answer Correct Answer: D) Dragging a heavy box on a carpet. 25. Which of the following factors does NOT affect friction? A) Weight of the object. B) Color of the object. C) Material of the surfaces. D) Surface texture. Show Answer Correct Answer: B) Color of the object. 26. Why a carrom board is powdered before playing? A) To increase the friction. B) For fragrance. C) For decoration. D) To reduce friction. Show Answer Correct Answer: D) To reduce friction. 27. What is the primary purpose of an airplane's wings? A) To increase speed. B) To reduce weight. C) To provide lift. D) To enhance stability. Show Answer Correct Answer: C) To provide lift. 28. Rolling friction > sliding friction>static frictionThe above order of frictions is ..... A) Correct. B) Incorrect. C) All the above. D) None of the above. Show Answer Correct Answer: A) Correct. 29. Motion of butterfly is A) Uniform motion. B) Non uniform motion. C) All the above. D) None of the above. Show Answer Correct Answer: B) Non uniform motion. 30. The friction offered by fluids is called ..... A) Drag. B) Resistance. C) Force. D) Thrust. Show Answer Correct Answer: A) Drag. 31. How does temperature affect the friction between two surfaces? A) Increases friction. B) Depends on the materials. C) No effect. D) Decreases friction. Show Answer Correct Answer: B) Depends on the materials. 32. Friction depends on the ..... of the surfaces. A) Nature. B) Size. C) Height. D) Weight. Show Answer Correct Answer: A) Nature. 33. These are used to reduce unwanted heat in cars A) Powder. B) Oil. C) Coolants. D) None of the above. Show Answer Correct Answer: C) Coolants. 34. Friction can be removed by A) Polishing the surface. B) Using ball-bearing. C) Using rollers and wheels. D) Above all. Show Answer Correct Answer: D) Above all. 35. Friction is a ..... A) Contact force. B) Non-contact force. C) Magnetic force. D) None of these. Show Answer Correct Answer: A) Contact force. 36. Which of the following is NOT an example of friction? A) Using the brakes on your bike to slow you down. B) Putting your hand out the window. C) A satellite traveling through deep space. D) A hockey puck going across an ice rink. Show Answer Correct Answer: C) A satellite traveling through deep space. 37. What type of surface would likely produce the least friction? A) Rough concrete. B) Wet grass. C) Polished metal. D) Sandpaper. Show Answer Correct Answer: C) Polished metal. 38. In the second case where the ball moved on floor of ball activity we saw that A) The friction is more. B) Friction is most. C) There is no friction. D) Friction is less. Show Answer Correct Answer: D) Friction is less. 39. One day equal to how many A) 30 seconds. B) 60 seconds. C) 60 minutes. D) 24 hours. Show Answer Correct Answer: D) 24 hours. 40. In which of the following cases the friction is helpful (H) and troublesome (T)?(a) Lighting a matchstick(b) Applying the brakes on a cycle(c) Use a towel to open the tightly closed lid of a bottle(d) Pulling the drawer out of a desk A) H (b) H (c) T (d) T. B) T (b) T (c) T (d) H. C) T (b) T (c) H (d) H. D) H (b) H (c) H (d) T. Show Answer Correct Answer: D) H (b) H (c) H (d) T. 41. Last question:Does friction help us swim? then which friction? A) Yes, sliding friction. B) Yes, fuid friction. C) Maybe. D) Yes, Rolling friction. E) No. Show Answer Correct Answer: B) Yes, fuid friction. 42. What happens to friction when a surface is lubricated? A) It increases. B) It decreases. C) It remains the same. D) It becomes unpredictable. Show Answer Correct Answer: B) It decreases. 43. Give one example where ball bearings are used. A) Hover craft. B) Ceiling fan. C) Car wheels. D) None of the above. Show Answer Correct Answer: B) Ceiling fan. 44. Which force prevents us from slipping while walking on the road? A) Gravity. B) Frictional force. C) Balanced forces of nature. D) None of the above. Show Answer Correct Answer: B) Frictional force. 45. When most objects with smooth surfaces rub, there is less friction. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 46. The motion of an object will change when an unbalanced force is applied to it A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 47. Rough surfaces have ..... compared to smoother surfaces. A) Greater friction. B) Less friction. C) The same level of friction. D) None of the above. Show Answer Correct Answer: A) Greater friction. 48. Which of these vehicles runs on an air cushion? A) Hovercraft. B) Aeroplane. C) Helicopter. D) Metro rail. Show Answer Correct Answer: A) Hovercraft. ← PreviousRelated QuizzesScience QuizzesClass 8 QuizzesClass 8 Science Chapter 12 Friction Quiz 1Class 8 Science Chapter 12 Friction Quiz 2 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books