Engineering Mechanics
Which of the following statement is incorrect?

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
The ratio of the limiting friction to the normal reaction is called coefficient of friction

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Engineering Mechanics
The term 'Centroid' is

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

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Engineering Mechanics
The moment of a force

Is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force
Is the turning effect produced by a force, on the body, on which it acts
All of these
Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken

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