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49.

The resolved part of the resultant of two forces inclined at an angle 9 in a given direction is equal to                        
A. the algebraic sum of the resolved parts of the forces in the given direction B. the sum of the resolved parts of the forces in the given direction
C. the difference of the forces multiplied by the cosine of 9 D. the sum of the forces multiplied by the sine of 9



50.

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                        
A. 20 kg, - ve sense B. 20 kg, + ve sense
C. 10 kg, + ve sense D. 10 kg, - ve sense



51.

The units of moment of inertia of an area are                        
A. kg m2 B. m4
C. kg/m2 D. m3




52.

The units of moment of inertia of mass are                        
A. kg m2 B. m4
C. kg/m2 D. kg/m



53.

The weight of a body is due to                        
A. centripetal force of earth B. gravitational pull exerted by the earth
C. forces experienced by body in atmos-phere D. force of attraction experienced by par-ticles



54.

Two non-collinear parallel equal forces acting in opposite direction                        
A. balance each other B. constitute a moment
C. constitute a couple D. constitute a moment of couple



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