Theory of Machine
According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centers will lie on a

Triangle
Parabolic curve
Rectangle
Straight line

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Theory of Machine
Higher pairs are those which have

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

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Theory of Machine
Which is the false statement about the properties of instantaneous center?

The two rigid links have no linear velocities relative to each other at the instantaneous center
The double center can be denoted either by O2 or O12, but proper selection should be made
The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link
At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered

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