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

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

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

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

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Strength of Materials
According to Lami's theorem

Three forces acting at a point will be in equilibrium
Three forces acting at a point can be represented by a triangle, each side being proportional to force
If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium
If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

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