Engineering Mechanics

31. D' Alembert's principle is used for

  1. reducing the problem of kinetics to equivalent statics problem
  2. determining stresses in the truss
  3. stability of floating bodies
  4. designing safe structures
  5. solving kinematic problems.

Correct answer: (A)
reducing the problem of kinetics to equivalent statics problem

32. Dynamic friction as compared to static friction is

  1. same
  2. more
  3. less
  4. may be less of more depending on nature of surfaces and velocity
  5. has no correlation.

Correct answer: (C)
less

33. Effect of a force on a body depends upon

  1. magnitude
  2. direction
  3. position or line of action
  4. all of the above
  5. none of the above.

Correct answer: (D)
all of the above

34. Forces are called concurrent when their lines of action meet in

  1. one point
  2. two points
  3. plane
  4. perpendicular planes
  5. different planes.

Correct answer: (A)
one point

35. Forces are called coplanar when all of them acting on body lie in

  1. one point
  2. one plane
  3. different planes
  4. perpendicular planes
  5. different points.

Correct answer: (B)
one plane

36. Frictional force encountered after commencement of motion is called

  1. post friction
  2. limiting friction
  3. kinematic friction
  4. frictional resistance
  5. dynamic friction.

Correct answer: (E)
dynamic friction.

37. From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the e.g. of the remainder from the center of circular plate

  1. 0.5 cm
  2. 1.0 cm
  3. 1.5 cm
  4. 2.5 cm
  5. 0.25 cm.

Correct answer: (A)
0.5 cm

38. If a number of forces act simultaneously on a particle, it is possible

  1. not a replace them by a single force
  2. to replace them by a single force
  3. to replace them by a single force through C.G.
  4. to replace them by a couple
  5. to replace them by a couple and a force.

Correct answer: (B)
to replace them by a single force

39. 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
  5. none of the above.

Correct answer: (D)
(b) and (c) above

40. If a suspended body is struck at the center of percussion, then the pressure on die axis passing through the point of suspension will be

  1. maximum
  2. minimum
  3. zero
  4. infinity
  5. same as the force applied.

Correct answer: (C)
zero

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