A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if______________?

Related Mcqs:

1. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be__________________?

   A. downwards at its upper end
   B. upwards at its upper end
   C. perpendicular to the wall at its upper end
   D. zero at its upper end
   E. none of the above

2. On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be__________________?

   A. towards the wall at its upper end
   B. away from the wall at its upper end
   C. upwards at its upper end
   D. downwards at its upper end
   E. none of the above

3. 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
   E. 3r/A

4. 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

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. A number of forces acting at a point will be in equilibrium if_________________?

   A. their total sum is zero
   B. two resolved parts in two directions at right angles are equal
   C. sum of resolved parts in any two per-pendicular directions are both zero
   D. all of them are inclined equally
   E. none of the above

7. If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either__________________?

   A. meet in a point
   B. be all parallel
   C. at least two of them must meet
   D. all the above are correct
   E. none of the above

8. The necessary condition for forces to be in equilibrium is that these should be_______________?

   A. coplanar
   B. meet at one point ;
   C. both A. and B. above
   D. all be equal
   E. something else

9. If a rigid body is in equilibrium under the action of three forces, then_______________?

   A. these forces are equal
   B. the lines of action of these forces meet in a point
   C. the lines of action of these forces are parallel
   D. B. and C. above
   E. none of the above

10. Center of gravity of a solid cone lies on the axis at the height_______________?

    A. one-fourth of the total height above base
    B. one-third of the total height above base
    C. one-half of the total height above base
    D. three-eighth of the total height above the base
    E. none of the above