CIVIL ENGINEERING MCQS (R.S KHURMI & J.K. GUPTA)
CONTENTS
1- ENGINEERING MECHANICS
(a) Agree (b) Disagree
(a) chinging its motions (b) balance the forces , already acting on it
(c) give rise to the internal l stresses in it (d) all of these
3. In order to determine the effects of a force, acting o a body , we must know
(a) magnitude of the force (b) line of action of the force
(c) nature of the force i.e nither the force the push or pull
(d) all of the above
4. The unit of the force in S.I system of units is.
(a) dyne (b) Kilogram
(c) newton (d) watt
5. One kg force is equal to
(a) 7.8 N (b) 8.9 N
(c) 9.8 N (d) 12 N
6. A resultant force is a single force which produces the same effect as produced by all the given forces acting on a body.
(a) True (b) False
7. The process of finding out the resultant force is called ........of forces
8. The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as
(a) principle of independent of forces (b) principle of resolution of forces
(c) principle of transmissibility of forces (d) none of these
9. Vectors method for the resultant force is also called
polygon law of forces.
(a) Correct (b) Incorrect
10. The resultant of two forces P and Q acting at an angle e
is
(a) p+Q+2PQ sin (b) p+Q+2PQ cose
(c) p+Q-2PQ cos (d) p+0-2PQ tan
11. If the resultant of two forces P and Q acting at an angle Ꝋ , makes an angle a with the force then
(a) tan α = P sinꝊ ÷ P+Q cosꝊ (b) tanα = P cosꝊ ÷ P + Q cos
(b) tan α = Q sin Ꝋ ÷ P + Q cosꝊ (d) tanα = Q cosꝊ ÷ P + Q sin Ꝋ
12. The resultant of two forces P and Q (such that P>Q) acting along the same straight line, but in opposite direction, is given by
(a) P+Q (b) P-Q
(c) P/Q (d) Q/P
13. The resultant of two equal forces P making an angle 8,
is given by
(a) 2 Psin Ꝋ/2 (b) 2 Pcos Ꝋ /2
(c) 2 P tanꝊ /2 (d) 2 PcotꝊ/2
14. The resultant of two forces each equal to P and acting at right angles is
(a) P/√2 (b) P/2
(c) P/ 2√2 (d) √2 P
15. The angle between two forces when the resultant is
maximum and minimum respectively are
(a) 0° and 180° (b) 180° and 0°
(c) 90° and 180° (d) 90° and 0°
16. If the resultant of two equal forces has the same
magnitude as either of the forces, then the angle between the two forces is
(a) 30° (b) 60°
(c) 90°
(d) 12
17. The resultant of the two forces P & Q is R. If Q is
doubled , the new resultant is perpendicular to P. Then
(a) P = Q
(b) Q = R (c)
Q = 2R (d) none of these
18. Two forces are acting at an angle of 120°. The bigger force is 40N and
the resultant is perpendicular to the smaller one. The smaller force is
(a) 20N (b) 40N (c)
80N (d) none
of these
19. The term “leverage’ and ‘ mechanical advantage ‘ of a
compound lever have got the same meaning.
(a) Right (b)
wrong
20. A number of forces acting at a point will be in
equilibrium, if
(a) all the forces are equally inclined (b) sum of all the forces is zero
(c) sum of resolved parts in the vertical direction is zero
( i.e ∑v=0
)
(d) sum of resolved parts in the horizontal direction is
zero ( i.e ∑H=0 )
21. If a number of forces are acting at a point, their of
forcesultant is
(a)(ΣV)2+(ΣH)2 (b) √(ΣΛ)2
+(ΣH)2
(c) (ΣΛ)2+(ΣH)2+2(ΣΛ)(ΣΗ) (d) √(ΣΛ)2 +(ΣH)2 + 2(ΣΛ)(ΣΗ)
22. Fig. 1.38 shows the two equal forces at right angles acting at a point value of force Racting along their bisector and in opposite direction is
(a)P/2 (b) 2P
(c) √2P (d)P1√2
23. Ifa number of forces are acting at a point, their
resultant will be in
Fig.1.38
horizontal, such that
(a) tan Ꝋ = ΣH / ΣV (b) tan Ꝋ
= ΣV/ΣH
(c) tan Ꝋ =、ΣV+ΣH (d)
tan Ꝋ
= √ ΣV + ΣH
24. The triangle law of forces states that if two forces acting simultaneoa partik
represented in magnitude and direction by the two sides of a
triangle takeorder, tien
resultant may be represented in magnitude and direction by
the third side a triangle, akt
opposite order
(a) True (b) False
25. The polygon law of forces states that if a number of
forces, acting si
particle, be represented in magnitude and direction by the
sides a polygon
resultant is represented in magnitude and direction by the
closing side of
opposite direction.
(a) Correct
(b) Incorrect
26. Concurrent forces are those forces whose lines of action the
(a) lie on the same line (b) meet
at one point
(c) meet on the same plane (d) none of these
27. If the resultant of a number of forces acting on a body is zero,then tnot be in equibrium
(a) Yes (b) No
28. The forces, which meet at one point and their lines of action also liesame plane, are known as
(b) coplaner non-concurrent forces (a) coplaner concurrent forces
(d) non-coplaner non-concurrent forces (c) non-coplaner concurrent forces
29. The forces, which do not meet at one point, but their
lines of action lie on thesame plane,are
known as coplaner
concurrent forces
(a) Agree (b) Disagree
30. The forces which meet at one point, but their lines of action. known as non-coplaner concurrent forces
(a) lie (b) do not lie
31. The forces which do not meet at one point and their lines of action do not lie on the same plane are known as
(a) coplaner
concurrent forces (b) coplaner non-concurrent forces
(c) non-coplaner
concurrent forces (d) none of these
32. Coplaner non-concurrent forces are those forces which..........at one but their lines of action lie on the same plane
(a) meet (b) do not
meet
33.Coplaner concurrent forces are those forces which
(a) meet at one point, but their lines of action do not lie
on the same pl
(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
34.Non-coplaner concurrent forces are those forces which
(a) meet at one point, but their lines of action do not lie
on the sameplane
(b) do not meet at one point and their lines of action do
not lie on the 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
35.Non-coplaner non-concurrent forces are those forces which
(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 plane
(c) do not meet at one point but their lines of action lie
on the same plane
(d) none of the above
36. If three coplaner forces acting on a point are in equilibrium, then each forcr is proportional to the sine of the angle between the other two
(a) Right (b) Wrong
39. If a given force (or a given system of forces) acting on
a body... the position of the body,
(a) change (b) does not
change
Fig. 1.39
40. If three forces acting at a point are represented in
magnitude and direction by the three side
of a triangle, taken in order, then the forces are in
equilibrium
(a) Yes (b) No
41. If a number of forces acting a sides of a triangle, taken in order, then the forces are not in equilibrium.
(a) Agree
(b) Disagree
42. The moment of a force ta point be represented in magnitude and direction by the three
(a) is the turning effect produced by a force, on the body,
on which it acts
(b) is equal to the product of force acting on the body and
the perpendicular distance of
point and the line of action of the force
(c) is equal to twice the area of the traingle, whose base
is the line representing the force an
whose vertex is the point, about which the moment is taken
(d) all of the above
43. The moment of the force P about Q as shown in Fig. 1.40,
is
(a)P × OA (b) P × OB
(c)
Fig. 1.40
44. If a number of coplaner forces acting at a point be in
equilibrium, the sum of clockwise
moments must be..... the sum of antic clockwise
moments, about any point.
(a) equal to
(b) less than
(c) greater than
45. Varingon's theorem of moments states that if a number of coplaner forces acting on a particle in equilibrium, then
(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 the
resultant force about the same point.
46. According to the law of moments, if a number of coplaner
forces acting on a particle are in equilibrium, then
(a) their algebraic
suns is zero (b)
their lines of action are at eoual 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.
47. For any system of
coplaner forces, the condition of equilibrium is that the
(a) algebraic sum of
the horizontal components of all the forces should be zero
(b) algebraic sum of
the vertical components of all the forces should be zero
(c) algebraic sum of moments of all the forces about any
point should be zero
(d) all of the above
48. The forces, whose lines of action are parallel to each
other and act in the same directions, are known as
(a) coplaner concurrent forces (b) coplaner non-concurrent
forces
(c) like parallel
forces ' (d) ratlike parallel forces
49. The three forces of 100 N, 200 N and 300 7 have their
lines of action parallel to each other but act in the opposite directions.
These forces are known as
(a) coplaner concurrent forces
(b) coplaner
non-concurrent forces
(c) like parallel
forces
(d) unlike parallel forces
50. Two like parallel
forces are acting at a distance of 24 mm apart and their resultant is 20N. If
the line of action of the resultant is 6 mm from any given force, the two
forces are
(a) 15N and 5 N (b) 20 N and 5 N (c) 15 N and 15 N (d) none of these
51. If a body is acted upon by a number of coplaner
non-concurrent forces, it may
(a) rotate about itself without moving
(b) move in any one
direction rotating about itself
(c) be completely at rest (d) all of these
52. A smooth cylinder lying on its convex surface remains in equilibrium.
(a) stable (b) unstable (c) neutral
53. Three forces acting on a rigid body are represented in magnitude, direction and line of action y the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to
(a)
area of the triangle
(b) twice the area of the
triangle
(c) half the area of the triangle (d) none of these
54. The principle of transmissibility of forces states that,
when a force acts upon a body, its effect
(a) same at every point on its line of action
(b) different at
different points on its line of action
(c) mini-num, if it acts at the centre of gravity of the
body
(d) maximum, if it
acts at the centre of gravity of the body
55. A smooth cylinder lying on a.......... is in neutral
equilibrium.
(a) curved surface (b) convex surface (c) horizontal surface
56. If three forces acting at a point be represented in
magnitude and direction by the three sides
of a triangle, taken in order, the forces shall be in
equilibrium.
(a) True (b) False
57. Two equal and opposite parallel forces whose lines of
action are different, can be replaced by
a single force parallel to the given forces.
(a) Correct (b) Incorrect
58. Two equal and opposite parallel forces whose lines of
action are different form a couple.
(a) Right (b) Wrong
59. A couple produces
(a) translatory motion (b)
rotational motion
(c) combined translatory and rotational motion (d) none of the above
60. Which of the following statement is correct?
(a) The algebraic sum of the forces, constituting the couple
is zero.
(b) The algebraic sum of the forces, constituting the
couple, about any point is the same.
(c) A couple cannot be balanced by a single force but can be
balanced only by a couple of
opposite sense.
(d) all of the above
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