Question

Which of these reduces friction between two objects?
(i) Use of wheels and rollers
(ii) Smoothening the surfaces of contact
(iii) Use of lubricants
(iv) Changing the colour of vehicles

• A. Only (i) and (ii)
• B. Only (ii), (iii) and (iv)
• C. Only (i), (ii) and (iii)
• D. Only (ii) and (iv)

Answer 1

The correct option is C

Only (i), (ii) and (iii)

Changing color of vehicles does not have any effect on friction between two surfaces. However, use of wheel and rollers, smoothening of surfaces and use of lubricants can reduce friction acting between two surfaces.