Theory of Machine
The motion between a pair when limited to a definite direction, irrespective of the direction of force applied, is known as

None of these
Completely constrained motion
Incompletely constrained motion
Successfully constrained motion

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Theory of Machine
Lower pairs are those which have

Surface contact between the two elements when in motion
Two elements that permit relative motion
Elements of pairs not held together mechanically
Point or line contact between the two elements when in motion

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