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37.

The algebraic sum of moments of the forces forming couple about any point in their plane is                        
A. equal to the moment of the couple B. constant
C. both of above are correct D. both of above are wrong



38.

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                        
A. forces B. independence of forces
C. dependence of forces D. balance of force



39.

The centre of gravity of a triangle lies at the point of                        
A. concurrence of the medians B. intersection of its altitudes
C. intersection of bisector of angles D. intersection of diagonals




40.

The centre of gravity of a uniform lamina lies at                        
A. the centre of heavy portion B. the bottom surface
C. the mid point of its axis D. all of the above



41.

The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be                        
A. r/2 B. 2r/3
C. r/A D. 3r/2



42.

The centre of percussion of the homogeneous rod of length L suspended at the top will be                        
A. L/2 B. L/3
C. 3L/4 D. 2L/3



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