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

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Strength of Materials
The weight of a body is due to

force of attraction experienced by par-ticles
gravitational force of attraction towards the centre of the earth.
gravitational pull exerted by the earth
centripetal force of earth

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

Minimum when it acts at the C.G. of the body
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

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