Strength of Materials
The center of gravity of a uniform lamina lies at

All of these
the bottom surface
the center of heavy portion
the mid point of its axis

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Strength of Materials
Coefficient of friction is the

the friction force acting when the body is just about to move
angle between normal reaction and the resultant of normal reaction and the limiting friction
ratio of limiting friction and normal reaction
the friction force acting when the body is in motion

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Strength of Materials
The weight of a body is due to

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

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Strength of Materials
In the equation of virtual work, following force is neglected

All of the listed here
reaction of any smooth surface with which the body is in contact
reaction at a point or an axis, fixed in space, around which a body is con-strained to turn
reaction of a rough surface of a body which rolls on it without slipping

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