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  • Question

  • The polygon law of forces states that if a number of forces, acting simultaneously on a particle, be represented in magnitude and direction by the sides a polygon taken in order, then their resultant is represented in magnitude and direction by the closing side of the polygon, taken in opposite direction.


  • Options
  • A. Correct
  • B. Incorrect

  • Correct Answer
  • Correct 

    • Engineering Mechanics problems

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    • 1. The loss of kinetic energy during inelastic impact, is given by(where m1 = Mass of the first body,m2 = Mass of the second body, and u1 and u2 = Velocities of the first and second bodies respectively.)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. In actual machines, mechanical advantage is __________ velocity ratio.

    • Options
    • A. equal to
    • B. less than
    • C. greater than
      • Discuss
    • 3. If the masses of both the bodies, as shown in the below figure, are doubled, then the acceleration in the string will be

    • Options
    • A. same
    • B. half
    • C. double
      • Discuss
    • 4. Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. Varingon's theorem of moments states that if a number of coplaner forces acting on a particle are in equilibrium, then

    • Options
    • A. their algebraic sum is zero
    • B. their lines of action are at equal distances
    • C. the algebraic sum of their moments about any point in their plane is zero
    • D. the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point.
      • Discuss
    • 6. The periodic time (T) is given by(where ? = Angular velocity of particle in rad / s.)

    • Options
    • A. ?/2?
    • B. 2?/?
    • C. 2? x ?
    • D. ?/?
      • Discuss
    • 7. The centre of oscillation and centre of suspension for a compound pendulum are interchangeable.

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    • A. True
    • B. False
      • Discuss
    • 8. The terms 'leverage' and 'mechanical advantage' Of a compound lever have got the same meaning.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 9. For a self locking machine, the efficiency must be

    • Options
    • A. equal to 50%
    • B. less than 50%
    • C. greater than 50%
    • D. 100%
      • Discuss
    • 10. A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of

    • Options
    • A. 1m
    • B. 2m
    • C. 3m
    • D. 4m
      • Discuss

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