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MCQs

Total Questions : 735 | Page 5 of 74 pages
Question 41. Coefficient of friction is the
  1.    angle between normal reaction and the resultant of normal reaction and the limiting friction
  2.    ratio of limiting friction and normal reaction
  3.    the friction force acting when the body is just about to move
  4.    the friction force acting when the body is in motion
 Discuss Question
Answer: Option B. -> ratio of limiting friction and normal reaction
Question 42. Pick up wrong statement about friction force for dry surfaces. Friction force is
  1.    proportional to normal load between the surfaces
  2.    dependent on the materials of contact surface
  3.    proportional to velocity of sliding
  4.    independent of the area of contact surfaces
 Discuss Question
Answer: Option C. -> proportional to velocity of sliding
Question 43. Which of the following is not the unit of energy
  1.    kg m
  2.    kcal
  3.    wattr
  4.    watt hours
 Discuss Question
Answer: Option C. -> wattr
Question 44. A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to
  1.    W
  2.    W sin (a + $)
  3.    Wtan(a +
  4.    Wan(a-)
 Discuss Question
Answer: Option C. -> Wtan(a +
Question 45. If a rigid body is in equilibrium under the action of three forces, then
  1.    these forces are equal
  2.    the lines of action of these forces meet in a point
  3.    the lines of action of these forces are parallel
  4.    (B) and (C) above
 Discuss Question
Answer: Option D. -> (B) and (C) above
Question 46. The coefficient of friction depends on
  1.    area of contact
  2.    shape of surfaces
  3.    strength of surfaces
  4.    nature of surface
 Discuss Question
Answer: Option D. -> nature of surface
Question 47. A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span
  1.    2.5 cm
  2.    3.0 cm
  3.    4.0 cm
  4.    5.0 cm
 Discuss Question
Answer: Option C. -> 4.0 cm
Question 48. In the lever of third order, load W, effort P and fulcrum F are oriented as follows
  1.    W between P and F
  2.    F between W and P
  3.    P between W and F
  4.    W, P and F all on one side
 Discuss Question
Answer: Option A. -> W between P and F
Question 49. A number of forces acting at a point will be in equilibrium if
  1.    Their total sum is zero
  2.    Two resolved parts in two directions at right angles are equal
  3.    Sum of resolved parts in any two perpendicular directions are both zero
  4.    All of them are inclined equally
 Discuss Question
Answer: Option C. -> Sum of resolved parts in any two perpendicular directions are both zero
Question 50. In ideal machines
  1.    mechanical advantage is greater than velocity ratio
  2.    mechanical advantage is equal to velocity ratio
  3.    mechanical advantage is less than velocity ratio
  4.    mechanical advantage is unity
 Discuss Question
Answer: Option B. -> mechanical advantage is equal to velocity ratio

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