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Mechanical Engineering Objective Questions { Strength of Materials }

169. Pick up the correct statement fromthe following :
A. The resultant of three concurrent forces, P,Q and.? can be obtained by the parallelogram method
B. The resultant of three or more concurrnet forces can be obtained by any convenient order of tip-tail vector addition.
C. Mass is that invariant property of a body which measures its resistance to a change of motion.
D. All the above.
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170. Which one of the following is the axiom of mechanics?
A. The resultant of two forces is the diagonal formed onthe vectors of these forces.
B. The foreces are in equilibrium only when they are equal in magnitude, opposite in direction, and collnear in action.
C. A set of forcesin equilibrium may be added to any system of forces without changing the effectofthe original system.
D. All the above.
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171.  The resultant of the loads acting on the Fink truss acts right of A at a distance of2W 10.5W
A. 4 m
B. 5 m
C. 6 m
D. 7.5 m
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172.  Pick up the correct statement from the following :
A. If the resultant of a force-system acting on a body is zero, the body is said to be in equilibrium.
B. Balanced force system compose the subject matter of statics.
C. Unbalanced force systems cause bodies to accelerate.
D. All the above.
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173. Pick up the correct statement from the following :
A. The earth pull is treated as a downward vertical force equal to the weight W of the free body and acting through the centre of gravity.
B. The action of a smooth surface is treated as a force N acting perpendicular to the smooth surface.
C. The supporting force F acting at a smooth pin or hinge acts in any direction perpendicular to the pin axis.
D. All the above.
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