Strength of Materials
A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if

the floor is smooth, the wall is rough
the floor and wall both are rough sur-faces
the floor and wall both are smooth surfaces
the floor is rough, the wall is smooth

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Strength of Materials
According to principle of transmissibility of forces, the effect of a force upon a body is

Maximum when it acts at the center of gravity of a body
Different at different points in its line of action
The same at every point in its line of action
Minimum when it acts at the C.G. of the body

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