Which of the following is an example of sliding pair?

A Piston and cylinder of a reciprocating steam engine
B Shaft with collars at both ends fitted into a circular hole
C Lead screw of a lathe with nut
D Ball and a socket joint

Correct Answer: Piston and cylinder of a reciprocating steam engine

When the nature of contact between the element of a pair is such that it can only slide relative to the other, the pair is known as a sliding pair and can be found in piston and cylinder of a reciprocating steam engine.

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