When trying to turn a key into a lock, following is applied _____________________?

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. 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

3. If a number of forces act simultaneously on a particle, it is possible _____________________?

   A. not a replace them by a single force
   B. to replace them by a single force
   C. to replace them by a single force through C.G.
   D. to replace them by a couple
   E. to replace them by a couple and a force

4. 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

5. 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

6. The ratio of limiting friction and normal reaction is known as _____________________?

   A. coefficient of friction
   B. angle of friction
   C. angle of repose
   D. sliding friction
   E. friction resistance

7. The C.G. of a right circular solid cone of height h lies at the following distance from the base______________?

   A. h/2
   B. J/3
   C. h/6
   D. h/4
   E. 3/i/5

8. Which of the following is not the unit of energy_________________?

   A. kg m
   B. kcal
   C. wattr
   D. watt hours
   E. kg m x (m/sec)2

9. Which of the following is a vector quantity___________________?

   A. energy
   B. mass
   C. momentum
   D. angle
   E. speed

10. In the equation of virtual work, following force is neglected_______________________?

    A. reaction of any smooth surface with which the body is in contact
    B. reaction of a rough surface of a body which rolls on it without slipping
    C. reaction at a point or an axis, fixed in space, around which a body is con-strained to turn
    D. all of the above
    E. none of the above