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251.

A swinging pendulum in its mid-position possesses

A.	only the potential energy	B.	only the kinetic energy
C.	more kinetic energy and less potential energy	D.	None of the above

252.

When the two elements of a pair are kept in contact with the help of a spring, the pair is known as

A.	A lower pair	B.	a higher pair
C.	a closed pair	D.	an unclosed pair

253.

A mechanism is an assembly of

A.	two links	B.	three links
C.	only four links	D.	four or more than four links

254.

When one of the links of a kinematic chain is fixed it is known as

A.	structure	B.	mechanism
C.	machine	D.	None of the above

255.

In the elliptical trammel mechanism, the mid-point of the link connecting the two sliders traverses

A.	an elliptical path	B.	a parobolic path
C.	a circular path	D.	none of the above

256.

The number of links in Paucellier mechanism is

A.	4	B.	5
C.	6	D.	8