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MCQs

Total Questions : 1187 | Page 1 of 119 pages
Question 1. 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 width (b), is
  1.     db³/12
  2.     bd³/12
  3.     db³/36
  4.     bd³/36
 Discuss Question
Answer: Option B. ->  bd³/12
Question 2. A number of forces acting at a point will be in equilibrium, if
  1.     All the forces are equally inclined
  2.     Sum of all the forces is zero
  3.     Sum of resolved parts in the vertical direction is zero (i.e. ∑V = 0)
  4.     None of these
 Discuss Question
Answer: Option C. ->  Sum of resolved parts in the vertical direction is zero (i.e. ∑V = 0)
Question 3. In the shown figure, if the angle of inclination of the plane is increased, then acceleration of the system will
  1.     Increase
  2.     Decrease
  3.     Remain the same
  4.     None of these
 Discuss Question
Answer: Option B. ->  Decrease
Question 4. A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if
  1.     The floor is smooth, the wall is rough
  2.     The floor is rough, the wall is smooth
  3.     The floor and wall both are smooth surfaces
  4.     The floor and wall both are rough surfaces
 Discuss Question
Answer: Option C. ->  The floor and wall both are smooth surfaces
Question 5. An ideal machine is one whose efficiency is
  1.     Between 60 and 70 %
  2.     Between 70 and 80%
  3.     Between 80 and 90%
  4.     100%
 Discuss Question
Answer: Option D. ->  100%
Question 6. Center of percussion is
  1.     The point of C.G.
  2.     The point of metacenter
  3.     The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
  4.     Point of suspension
 Discuss Question
Answer: Option C. ->  The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
Question 7. During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.
  1.     Equal to
  2.     Equal and opposite to
  3.     Less than
  4.     Greater than
 Discuss Question
Answer: Option B. ->  Equal and opposite to
Question 8. Effect of a force on a body depends upon
  1.     Magnitude
  2.     Direction
  3.     Position or line of action
  4.     All of the above
 Discuss Question
Answer: Option D. ->  All of the above
Question 9. The velocity ratio of a differential wheel and axle with 'd' as the diameter of effort wheel and d1 and d2 as the diameters of larger and smaller axles respectively, is
  1.     D/(d₁ + d₂)
  2.     D/(d₁ - d₂)
  3.     2D/(d₁ + d₂)
  4.     2D/(d₁ - d₂)
 Discuss Question
Answer: Option D. ->  2D/(d₁ - d₂)
Question 10. A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. select the correct reason from the following:
  1.     Both the balls undergo an equal change in momentum
  2.     The change in momentum suffered by rubber ball is more than the lead ball
  3.     The change in momentum suffered by rubber ball is less than the lead ball
  4.     None of the above
 Discuss Question
Answer: Option B. ->  The change in momentum suffered by rubber ball is more than the lead ball

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