73) The necessary condition for forces to be in equilibrium is that these should be

(a) coplanar

(a) meet at one point ;

all of the above

both (a) and (b) above

Answer is:

both (a) and (b) above

Engineering Mechanics MCQ with Answers

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74) If three forces acting in different planes can be represented by a triangle, these will be in

non-equilibrium

partial equilibrium

full equilibrium

unpredictable

Answer is:

non-equilibrium

75) If n = number of members and j = number of joints, then for a perfect frame, n =

j-2

2j-l

2j-3

3j-2

Answer is:

2j-3

Explanation:

A perfect frame is that which is composed of members just sufficient to keep it in equilibrium, when loaded, without any change in its shape. A perfect frame should satisfy the following expression:

n = 2j-3
where
n = Number of members, and
j = Number of joints.

76) A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly

38 m

62.5 m

96 m

124 m

Answer is:

62.5 m

77) A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to

100

250

Answer is:

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73) The necessary condition for forces to be in equilibrium is that these should be

both (a) and (b) above

Engineering Mechanics MCQ with Answers

Related Engineering Mechanics MCQ with Answers

74) If three forces acting in different planes can be represented by a triangle, these will be in

non-equilibrium

75) If n = number of members and j = number of joints, then for a perfect frame, n =

2j-3

76) A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly

62.5 m

77) A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to

50

Engineering Mechanics MCQ with Answers