Engineering Mechanics
Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is

bd³/36
db³/12
db³/36
bd³/12

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Engineering Mechanics
According to the law of moments, if a number of coplanar forces acting on a particle are in equilibrium, then

The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point
Their lines of action are at equal distances
Their algebraic sum is zero
The algebraic sum of their moments about any point in their plane is zero

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Engineering Mechanics
The term 'Centroid' is

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 suspension
The same as centre of gravity
None of the listed here

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Engineering Mechanics
The resolved part of the resultant of two forces inclined at an angle 'θ' in a given direction is equal to

The difference of the forces multiplied by the cosine of θ
The sum of the forces multiplied by the sine of θ
The algebraic sum of the resolved parts of the forces in the given direction
The sum of the resolved parts of the forces in the given direction

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