Friction Quiz - CBSE Class 8 Science

Free practice quiz: Friction (CBSE Class 8 Science). 12 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which surface would cause more friction: a smooth wooden floor or a carpeted floor?

   1. Smooth wooden floor
   2. Carpeted floor
   3. Both the same
   4. Neither
   Show answer

   Answer: B. Carpeted floor

   Carpeted floors have a rougher surface than smooth wooden floors, leading to more friction.

2. Explain how lubricants reduce friction.

   1. They increase surface roughness
   2. They create a smoother surface between objects
   3. They add more weight to the objects
   4. They make objects stick together
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   Answer: B. They create a smoother surface between objects

   Lubricants fill in the gaps between surfaces, creating a smoother, less resistant layer that reduces friction.

3. How does the weight of an object affect the friction between it and a surface?

   1. Heavier objects create less friction
   2. Heavier objects create more friction
   3. Weight doesn't affect friction
   4. It depends on the surface
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   Answer: B. Heavier objects create more friction

   The greater the force pushing the object against the surface (weight), the greater the friction.

4. A car's tires are designed with specific tread patterns. How does this relate to friction and safety?

   1. Treads reduce friction for better speed
   2. Treads increase friction for better grip
   3. Treads have no effect on friction
   4. Treads decrease safety
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   Answer: B. Treads increase friction for better grip

   Tire treads increase the surface area in contact with the road, creating more friction and therefore better grip and control, enhancing safety.

5. Discuss the advantages and disadvantages of friction in everyday life, providing specific examples for each.

   1. Only advantages exist
   2. Only disadvantages exist
   3. Advantages outweigh disadvantages
   4. Disadvantages outweigh advantages
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   Answer: C. Advantages outweigh disadvantages

   Friction is essential for many actions (walking, writing, braking), but it also causes wear and tear (engine parts, tires). While it causes energy loss, the benefits often outweigh this cost.

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