8) When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a

Answer is:

Screw pair

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9) Which of the following is an example of sliding pair ?

Answer is:

Piston and cylinder of a reciprocating steam engine

10) The lead screw of a lathe with nut forms a

Answer is:

Screw pair

The lead screw of a lathe with nut forms a

11) Which of the following is a turning pair ?

Answer is:

Shaft with collar at both ends fitted into a circular hole.

Explanation:

When the two elements of a pair are connected in such a way that one can only turn or revolve about a fixed axis of another link, the pair is known as turning pair. A shaft with collars at both ends fitted into a circular hole, the crankshaft in a journal bearing in an engine, lathe spindle supported in head stock, cycle wheels turning over their axles etc. are the examples of turning pair. A turning pair also has a completely constrained motion.