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Class 8 Science Chapter 12 Friction Quiz 7 (25 MCQs)

Quiz Instructions

Select an option to see the correct answer instantly.

1. Friction is always useful to us.

Correct Answer: B) False.

2. The force of friction always acts on

Correct Answer: B) Moving objects.

3. Which of the following scenarios would likely result in the highest friction?

Correct Answer: D) Dragging a heavy box on a carpet.

4. Lubricants

Correct Answer: B) Decrease friction.

5. Which of the following factors does NOT affect friction?

Correct Answer: C) Color of the object.

6. Why a carrom board is powdered before playing?

Correct Answer: A) To reduce friction.

7. How would the absence of friction affect a marble traveling on a long, straight path?

Correct Answer: D) The marble would remain at constant speed.

8. What is the primary purpose of an airplane's wings?

Correct Answer: A) To provide lift.

9. Rolling friction > sliding friction>static frictionThe above order of frictions is .....

Correct Answer: A) Correct.

10. Motion of butterfly is

Correct Answer: B) Non uniform motion.

11. The friction offered by fluids is called .....

Correct Answer: C) Drag.

12. How does temperature affect the friction between two surfaces?

Correct Answer: D) Depends on the materials.

13. Friction depends on the ..... of the surfaces.

Correct Answer: B) Nature.

14. These are used to reduce unwanted heat in cars

Correct Answer: C) Coolants.

15. Friction can be removed by

Correct Answer: D) Above all.

16. Which of the following is NOT an example of friction?

Correct Answer: C) A satellite traveling through deep space.

17. What type of surface would likely produce the least friction?

Correct Answer: C) Polished metal.

18. In the second case where the ball moved on floor of ball activity we saw that

Correct Answer: B) Friction is less.

19. One day equal to how many

Correct Answer: A) 24 hours.

20. 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

Correct Answer: D) H (b) H (c) H (d) T.

21. Last question:Does friction help us swim? then which friction?

Correct Answer: E) Yes, fuid friction.

22. What happens to friction when a surface is lubricated?

Correct Answer: B) It decreases.

23. Give one example where ball bearings are used.

Correct Answer: B) Ceiling fan.

24. Which force prevents us from slipping while walking on the road?

Correct Answer: B) Frictional force.

25. When most objects with smooth surfaces rub, there is less friction.

Correct Answer: A) True.

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