Question

Select the incorrect statement regarding reducing friction
A. By applying lubricants
B. By using ball baring
C. By putting powder
D. By putting grooves and ridges

Answer 1

by putting powder

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Answer 2

Answer:

D. By Putting grooves and ridges

Explanation:

As, the rough surfaces help in increasing the friction whereas smooth surfaces reduce it. According to Question, grooves and ridges are a part of rough surfaces because when you slide your hand from surface filled with grooves, it's difficulty to past smoothly, because of increased friction. Hence, option d in incorrect.