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

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

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Strength of Materials
The weight of a body is due to

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

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Strength of Materials
Center of percussion is

the point of metacentre
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
the point of C.G.

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Strength of Materials
In ideal machines

mechanical advantage is less than velocity ratio
mechanical advantage is equal to velocity ratio
mechanical advantage is greater than velocity ratio
mechanical advantage is unity

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