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Engineering Mechanics problems

  • 1. The moment of inertia of a square of side a about its diagonal is

  • Options
  • A. a2/8
  • B. a3/12
  • C. a4/12
  • D. a4/16
    • Discuss
  • 2. According to the law of moments, 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
  • 3. A lift moves downwards with an acceleration of 9.8 m/s2. The pressure exerted by a man on the floor of the lift is zero.

  • Options
  • A. True
  • B. False
    • Discuss
  • 4. The maximum efficiency of a screw jack is

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 5. The resultant of two forces P and Q acting at an angle ? is

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 6. The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

  • Options
  • A. Newton's first law of motion
  • B. Newton's second law of motion
  • C. principle of conservation of energy
  • D. principle of conservation of momentum
    • Discuss
  • 7. A newton is defined as the force while acting upon a mass of one kg, produces an acceleration of 1 m / s2 in the direction of which it acts.

  • Options
  • A. Yes
  • B. No
    • Discuss
  • 8. A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

  • Options
  • A. reversible
  • B. non-reversible
  • C. ideal
    • Discuss
  • 9. Non-coplaner 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. meet at one point and their lines of action also lie on the same plane
  • D. do not meet at one point, but their lines of action lie on the same plane
    • Discuss
  • 10. The overturning of a vehicle on a level circular path can be avoided if the velocity of vehicle is __________ Mechanical Engineering Engineering Mechanics: The overturning of a vehicle on a level circular path can be avoided if the velocity of vehicle is _.

  • Options
  • A. less than
  • B. greater than
    • Discuss

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