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Friction — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceFriction1 Mark
MCQ
Assertion (A) Lubricants increases the friction force.
Reason (R) Friction is a necessary evil.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A
  • C
    A is true but R is false.
  • D
    A is false but R is true.
✓

Answer

D. Lubricants are the materials which minimise the friction force. Friction has advantages as well as disadvantages. That's why, it is called as a necessary evil.

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