Class 7 Science Study App | Frictional Force MCQ e-Book PDF

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Class 7 Science MCQs – Certification Test 47

Frictional Force MCQ (Question 47) – Study App & e-Book Download

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MCQ 47: The force of friction can be reduced by the help of:

  1. ball bearing
  2. lubricants
  3. cushion surfaces
  4. all of them
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