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Strength of Materials

Strength of Materials
The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is

same
double
half
four times

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Strength of Materials
The resultant of the following three couples 20 kg force, 0.5 m arm, + ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be

10 kg, + ve sense
10 kg, – ve sense
20 kg, – ve sense
20 kg, + ve sense

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Strength of Materials
Forces are called coplanar when all of them acting on body lie in

one plane
perpendicular planes
different planes
one point

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Strength of Materials
The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of

resolution of forces.
balance of force
forces
independence of forces

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Strength of Materials
If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either

All of the listed here
at least two of them must meet
be all parallel
meet in a point

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Strength of Materials
Tangent of angle of friction is equal to

kinetic friction
coefficient of friction
limiting friction
angle of repose

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