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_______________?

Related Mcqs:

1. 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

2. 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

3. Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction___________________?

   A. along the plane
   B. horizontally
   C. vertically
   D. at an angle equal to the angle of friction to the inclined plane
   E. unpredictable

4. 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

5. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is_______________?

   A. 0°
   B. 30°
   C. 45°
   D. 60°
   E. 90°.

6. 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 ).

7. 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
   E. none of the above

8. A single force and a couple acting in the same plane upon a rigid body_____________________?

   A. balance each other
   B. cannot balance each other
   C. produce moment of a couple
   D. are equivalent
   E. none of the above

9. The C.G. of a plane lamina will not be at its geometrical centre in the case of a__________________?

   A. right angled triangle
   B. equilateral triangle
   C. square
   D. circle
   E. rectangle

10. The forces, which meet at one point, but their lines of action do not lie in a plane, are called_________________?

    A. coplanar non-concurrent forces
    B. non-coplanar concurrent forces
    C. non-coplanar non-concurrent forces
    D. intersecting forces
    E. none of the above