Multiple choice

Which of the following is not used to reduce friction?

  1. Oil

  2. Sand

  3. Ball bearings

  4. Graphite

  5. Talcum powder
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sand is used to increase friction, if sand is strewn on slippery ground during the rainy season then it becomes easier to walk on the ground.

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