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  • Question

  • A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act


  • Options
  • A. downward at its upper end
  • B. upward at its upper end
  • C. zero at its upper end
  • D. perpendicular to the wall at its upper end

  • Correct Answer
  • zero at its upper end 

    • Engineering Mechanics problems

    Search Results

    • 1. A lifting machine lifts a load of 1000N through a distance of 0.2 m by means of an effort of 200N through a distance of 1m. This machine is an ideal one.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 2. If a number of forces are acting at a point, their resultant is given by

    • Options
    • A. (?V)2 + (?H)2
    • B.
    • C. (?V)2 +(?H)2 +2(?V)(?H)
    • D.
      • Discuss
    • 3. In order to determine the effects of a force, acting on a body, we must know

    • Options
    • A. magnitude of the force
    • B. line of action of the force
    • C. nature of the force i,e. whether the force is push or pull
    • D. all of the above
      • Discuss
    • 4. One kg force is equal to

    • Options
    • A. 7.8 N
    • B. 8.9 N
    • C. 9.8 N
    • D. 12 N
      • Discuss
    • 5. The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is

    • Options
    • A. D + d
    • B. D - d
    • C. D x d
    • D. D / d
      • Discuss
    • 6. The efficiency of a lifting machine is the ratio of

    • Options
    • A. output to the input
    • B. work done by the machine to the work done on the machine
    • C. mechanical advantage to the velocity ratio
    • D. all of the above
      • Discuss
    • 7. The wheels of a moving car possess

    • Options
    • A. potential energy only
    • B. kinetic energy of translation only
    • C. kinetic energy of rotation only
    • D. kinetic energy of translation and rotation both
      • Discuss
    • 8. Non-coplaner non-concurrent forces are those forces which

    • Options
    • A. meet at one point, but their lines of action do not lie on the same plane
    • B. do not meet at one point and their lines of action do not lie on the same plane
    • C. do not meet at one point but their lines of action lie on the same plane
    • D. none of the above
      • Discuss
    • 9. If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ propotional to its mechanical advantage.

    • Options
    • A. directly
    • B. inversely
      • Discuss
    • 10. Two blocks A and B of masses 150 kg and 50 kg respectively are connected by means of a string as shown in the below figure. The tension in all the three strings __________ be same.

    • Options
    • A. will
    • B. will not
      • Discuss

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