A) Reduce friction
B) Develop more heat
C) Increase gravitational force
D) Change atmospheric pressure
Correct Answer: A
Solution :
Lubricants are thick, oily liquids. They cause two surfaces to easily slip on one another. This is because they reduce the friction between the two surfaces by creating a smooth layer between them. When lubricants are applied between two machine parts that are moving in contact with each other, the friction between them is reduced. This helps the machine parts to move faster without much wear and tear, thereby enhancing the efficiency of the machine. The correct answer is A.
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