Engineering Mechanics
A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act

Zero at its upper end
Perpendicular to the wall at its upper end
Upward at its upper end
Downward at its upper end

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Engineering Mechanics
The term 'Centroid' is

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

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