A. 0°
B. 30°
C. 45°
D. 60°
E. 90°.
Related Mcqs:
- 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 - The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of_______________?
A. friction
B. limiting friction
C. repose
D. kinematic friction
E. static friction - The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to _________________?
A. Wtan(a + )
B. Wtan(a-)
C. Wcos(a + )
D. Wsin(a + )
E. W (sin a + cos ). - The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is__________________?
A. same
B. double
C. half
D. four times
E. one fourth - A cable with a uniformly distributed load per horizontal meter run will take the following shape________________?
A. straight line
B. parabola
C. hyperbola
D. elliptical
E. part of a circle - A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to________________?
A. W
B. W sin (a + $)
C. Wtan(a + <|))
D. W\an(a-)
E. Wtana - A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve ____________________?
A. catenary
B. parabola
C. hyperbola
D. elliptical
E. circular arc - The center 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
E. 3r/A - A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span___________________?
A. 2.5 cm
B. 3.0 cm
C. 4.0 cm
D. 5.0 cm
E. 2.0 cm - 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 surfaces
E. will be in equilibrium under all conditions
