civil engineering MCQs – Page 58

Practise multiple-choice questions from civil engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

civil engineering Mcqs
1141. The force in AC of the truss shown in the given figure, is_________________?
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A. 5t compression

B. 4t compression

C. 5t tension

D. 4t tension
1142. Which of the following is not a scalar quantity__________________?
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A. volume

B. acceleration

C. time

D. density

E. mass

1143. A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be________________?
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A. none of the above

B. 10m

C. 1 m

D. 100m
1144. For determining the support reactions at A and B of a three hinged arch, points B and Care joined and produced to intersect the load line at D and a line parallel to the load line through A at D. Distances AD, DD and AD when measured were 4 cm, 3 cm and 5 cm respectively. The angle between the reactions at A and B is___________________?
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A. 30

B. 60

C. 45

D. 90
1145. The total pressure on a plane surface inclined at an angle 9 with the horizontal is equal to_______________?
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A. pA cos 9

B. pA sin 9

C. pA tan 9

D. PA
1146. The units of moment of inertia of an area are_______________?
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A. kg m2

B. kg/m2

C. m4

D. kg/m4

E. m3

1147. The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is_________________?
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A. d > m > e

B. e > d > m

C. e > m > d

D. d > e > m

1148. The ratio of moments of inertia of a triangular section about its base and about a centroidal axis parallel to its base, is_________________?
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A. 2

B. 3.0

C. 1.5

D. 1

1149. A shaft is subjected to bending moment M and a torque T simultaneously. The ratio of the maximum bending stress to maximum shear stress developed in the shaft, is____________________?
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A. 2M/ T

B. M/T

C. T/M

D. 2T/M

1150. In case of principal axes of a section________________?
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A. Sum of moment of inertia is zero

B. Product of moment of inertia is zero

C. Difference of moment inertia is zero

D. None of these

1151. The eccentricity (e) of a hollow circular column, external diameter 25 cm, internal diameter 15 cm for an eccentric load 100 t for non-development of tension, is__________________?
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A. 2.75 cm

B. 3.50 cm

C. 3.00 cm

D. 4.25 cm
1152. The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60 produce resultant of Vl3 kg. These forces are____________________?
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A. 2 and V6

B. none of the above

C. 2 and 5

D. 3 and 1 kg

E. V5andV5
1153. A close coil helical spring when subjected to a moment M having its axis along the axis of the helix_________________?
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A. Its mean diameter will decrease

B. It is subjected to pure bending

C. All the above

D. Its number of coils will increase

1154. Flat spiral springs_______________?
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A. Are supported at outer end

B. Are wound by applying a torque

C. All the above

D. Consist of uniform thin strips

1155. The ratio of the length and diameter of a simply supported uniform circular beam which experiences maximum bending stress equal to tensile stress due to same load at its mid span, is___________________?
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A. 4-Jan

B. 3-Jan

C. 8-Jan

D. 1/2
1156. cross sections of bronze and copper bars of equal lengt b c are their Ab and Ac are the respective stresses due to load P. If Pb and Pc are the loads shared by them, (where Eb and Ec are their modulii)____________________?
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A. P = Pb + Pc

B. P = Ab b + Ac b

C. All the above

D. b c = Eb /Ec

1157. The shape factor of standard rolled beam section varies from_______________?
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A. 1.20 to 1.30

B. 1.30 to 1.40

C. 1.10 to 1.20

D. 1.40 to 1.50

1158. A single force and a couple acting in the same plane upon a rigid body________________?
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A. none of the above

B. produce moment of a couple

C. are equivalent

D. balance each other

E. cannot balance each other
1159. Two coplanar couples having equal and op-posite moments_________________?
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A. produce a couple and an unbalanced force

B. are equivalent

C. can not balance each other

D. produce a moment of couple

E. balance each other

1160. A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t 4), the acceleration of the particle will be given by the equation_________________?
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A. 6f-4

B. 6t2-8t

C. 3t2-lt

D. 6f-8

E. 3t2+2t