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.Management Sciences
Category: Strength of Materials
The center 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
E. all of the above
The possible loading in various members of framed structures are_______________?
A. compression or tension
B. buckling or shear
C. shear or tension
D. all of the above
E. bending
A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to______________?
A. 25
B. 50
C. 100
D. 250
E. 500
A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if______________?
A. the floor is smooth, the wall is rough
B. the floor is rough, the wall is smooth
C. the floor and wall both are smooth surfaces
D. the floor and wall both are rough sur-faces
E. will be in equilibrium under all condi-tions
Center of percussion is______________?
A. the point of C.G.
B. the point of metacentre
C. the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
D. point of suspension
E. the point in a body about which it can rotate horizontally and oscillate under the influence of gravity
A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________?
A. remain horizontal
B. slant up towards direction of pull
C. slant down towards direction of pull
D. unpredictable
E. none of the above
A force acting on a body may_______________?
A. introduce internal stresses
B. balance the other forces acting on it
C. retard its motion
D. change its motion
E. all of the above
Dynamic friction as compared to static friction is________________?
A. same
B. more
C. less
D. may be less of more depending on nature of surfaces and velocity
E. has no correlation
In actual machines______________?
A. mechanical advantage is greater than velocity ratio
B. mechanical advantage is equal to velocity ratio
C. mechanical advantage is less than velocity ratio
D. mechanical advantage is unity
E. none of the above
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