Engineering Mechanics
Which of the following statement is incorrect?

The ratio of the limiting friction to the normal reaction is called coefficient of friction
A machine whose efficiency is 100% is known as an ideal machine
The velocity ratio of a machine is the ratio of load lifted to the effort applied
A force acting in the opposite direction to the motion of the body is called force of friction

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Engineering Mechanics
The term 'Centroid' is

The point of suspension
None of the listed here
The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
The same as centre of gravity

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