civil engineering Mcqs
1001. Pick up the correct statement from the following?
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A. For I sections, the shear centre coincides with the centroid of the cross section of the beam

B. For channels, the shear centre does not coincide its centroid

C. All the above

D. The point of intersection of the bending axis with the cross section of the beam, is called shear centre

1002. Pick up the correct statement from the following?
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A. The torque which when acting alone would produce maximum shear stress equal to the maximum shear stress caused by the combined bending and torsion, is called equivalent torque

B. Tcp = m2 + T2)where letters carry their usual meanings

C. Mcg = M M2 + r2) where letters carry their usual meanings

D. All the above
1003. The equivalent length of a column of length L, having both the ends hinged, is_______________?
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A. L

B. 2L

C. L

D. L/2

1004. In the truss shown in the given figure, the force in member BC is______________?
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A. Indeterminate

B. 100 t compressive

C. 100 t tensile

D. Zero
1005. A material may fail if______________?
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A. Maximum shear stress exceeds

B. All the above

C. /2

D. Maximum strain exceeds /E

E. 0

1006. P = /4L is the equation of Eulers crippling load, if__________________?
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A. Both the ends are fixed

B. Both the ends are hinged

C. One end is fixed and other end is free

D. One end is fixed and other end is hinged

1007. Surge wave in a rectangular channel is an example of_________________?
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A. unsteady flow

B. steady flow

C. correct answer is?

D. uniform flow

E. non-uniform flow</strong>

1008. The force in CD of the truss shown in given figure, is________________?
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A. Zero

B. 1.5t compression

C. 3t tension

D. 3t compression

1009. If the velocity is zero over half of the cross-sectional area and is uniform over the remaining half, then the momentum correction factor is_______________?
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A. 3-Apr

B. 4

C. 2

D. 1

1010. For beams of uniform strength, if depth is constant______________?
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A. Width b 3 M

B. Width b 1/M

C. Width b M

D. Width b M

1011. The forces in the members of simple trusses, may be analysed by________________?
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A. Method of sections

B. Method of joints

C. Graphical method

D. All the above
1012. A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is________________?
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A. 5kN

B. lOkN

C. 20 kN

D. 15 kN

1013. A simply supported rolled steel joist 8 m long carries a uniformly distributed load over it span so that the maximum bending stress is 75 N/mm. If the slope at the ends is 0.005 radian and the value of E = 0.2 106 N/mm2, the depth of the joist, is________________?
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A. 200 mm

B. 400 mm

C. 300 mm

D. 250 mm

1014. The center of gravity of a triangle lies at the point of__________________?
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A. intersection of its altitudes

B. all of the above

C. intersection of bisector of angles

D. concurrence of the medians

E. intersection of diagonals

1015. A shaft rotating N.R.M. under a torque T, transmits a power_______________?
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A. /30 Newton metres/sec

B. /60 Newton metres/min

C. /60 Newton metres/sec

D. /30 Newton metres/min

1016. The ratio of the maximum deflections of a simply supported beam with a central load W and of a cantilever of same length and with a load W at its free end, is________________?
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A. 8-Jan

B. 1/16

C. 12-Jan

D. 10-Jan

1017. In the cable shown in the given figure, the minimum tension occurs at___________________?
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A. Between A and C

B. C

C. B

D. A

1018. Pick up the incorrect statement from the following _______________?
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A. The C.G. of a rectangle is at the inter-section of its diagonals

B. The C.G. of a circle is at its center

C. The C.G. of a semicircle is at a distance of r/2 from the center

D. The C.G. of a triangle is at the intersection of its medians

E. The C-G. of an ellipse is at its center

1019. H V are the algebraic sums of the forces resolved horizontally and vertically respectively, M is the algebraic sum of the moments of forces about any point, for the equilibrium of the body acted upon____________________?
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A. H = 0

B. V = 0

C. All the above

D. M = 0

1020. The maximum deflection due to a uniformly distributed load w/unit length over entire span of a cantilever of length l and of flexural rigidly EI, is_________________?
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A. wl3/3EI

B. wl4/8EI

C. wl4/12EI

D. wl4/3EI

1021. The ratio of crippling loads of a column having both the ends fixed to the column having both the ends hinged, is________________?
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A. 4

B. 1

C. 2

D. 3

1022. The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be_________________?
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A. 20 kg, + ve sense

B. 10 kg, ve sense

C. 10 kg, + ve sense

D. 20 kg, ve sense

E. 45 kg, + ve sense

1023. Coefficient of contraction for an external cylindrical mouthpiece is_________________?
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A. 1.00

B. 0.7H

C. 0.611

D. 0.855

1024. On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be__________________?
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A. none of the above

B. downwards at its upper end

C. towards the wall at its upper end

D. away from the wall at its upper end

E. upwards at its upper end
1025. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is_________________?
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A. 60

B. 45

C. 90

D. 30

E. 0

1026. The ratio of maximum and average shear stresses on a rectangular section, is________________?
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A. 1.5

B. 1

C. 1.25

D. 2.5

1027. For determining the force in the member AB of the truss shown in the given figure by method of sections, the section is made to pass through AB, AD and ED and the moments are taken about___________________?
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A. Joint C

B. Joint B

C. Joint D

D. Joint A

1028. A steel rod 1 metre long having square cross section is pulled under a tensile load of 8 tonnes. The extension in the rod was 1 mm only. If Esteel = 2 106 kg/cm2, the side of the rod, is_________________?
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A. 1.5 cm

B. 2 cm

C. 2.5 cm

D. 1 cm

1029. The center of gravity of a uniform lamina lies at_______________?
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A. none of the above

B. the mid point of its axis

C. the center of heavy portion

D. the bottom surface

E. all of the above

1030. A shaft subjected to a bending moment M and a torque T, experiences__________________?
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A. Maximum bending stress = 32M d3

B. Maximum shear stress = 16 T d3

C. Both A. and B.

D. Neither A. nor B.

1031. The ratio of the length and depth of a simply supported rectangular beam which experiences maximum bending stress equal to tensile stress, due to same load at its mid span, is_______________?
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A. 3-Jan

B. 2-Jan

C. 2/3

D. 4-Jan

1032. The ratio of the area of cross-section of a circular section to the area of its core, is_______________?
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A. 16

B. 12

C. 4

D. 8

1033. At any point of a beam, the section modulus may be obtained by dividing the moment of inertia of the section by_________________?
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A. Maximum compressive stress at the section

B. Maximum tensile stress at the section

C. Depth of the neutral axis

D. Depth of the section

1034. The S.F. diagram of a loaded beam shown in the given figure is that of________________?
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A. A cantilever with an isolated load at the free end

B. A simply supported beam with uniformly distributed load

C. A simply supported beam with isolated central load

D. A cantilever with a uniformly distributed load
1035. Stress may be defined as_________________?
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A. None of these

B. Force per unit area

C. Force per unit length

D. Force per unit volume

1036. Which of the following statements is correct ?
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A. Lower critical Reynolds number has the value 2000 in pipe flow

B. Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow

C. Upper critical Reynolds number is significant in pipe flow problems.

D. Lower critical Reynolds number is of no practical significance in pipe flow problems.
1037. The force in AD of the truss shown in given figure, is________________?
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A. 4.0t compression

B. 3.0t compression

C. 0.5t compression

D. 0.5t tension

1038. Separation of flow occurs when_________________?
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A. the cross-section of a channel is reduced

B. the pressure intensity reaches a minimum

C. all of the above

D. the boundary layer comes to rest
1039. The moment of inertia of a triangular section (height h, base b) about its base, is_______________?
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A. bh3/12

B. bh/12

C. bh/12

D. b3h/12

1040. A steel bar 5 m 50 mm is loaded with 250,000 N. If the modulus of elasticity of the material is 0.2 MN/mm2 and Poissons ratio is 0.25, the change in the volume of the bar is_________________?
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A. 4.125 cm2

B. 2.125 cm3

C. 3.125 cm3

D. 1.125 cm3

1041. The boundary layer thickness in turbulent flow varies as______________?
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A. x,/2

B. x4/5

C. x3/5

D. x7

1042. y/n) (1 a l/r), is For calculating the allowable stress of long columns. The empirical formula 0 known as_________________?
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A. Rankines formula

B. Parabolic formula

C. Perrys formula

D. Straight line formula
1043. Pick up the correct statement from the following?
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A. In a loaded beam, the moment at which the first yield occurs is called yield moment

B. In a loaded beam, the moment at which the entire section of the beam becomes fully plastic, is called plastic moment

C. All the above

D. In a fully plastic stage of the beam, the neutral axis divides the section in two sections of equal area

1044. An isolated load W is acting at a distance a from the left hand support, of a three hinged arch of span 2l and rise h hinged at the crown, the horizontal reaction at the support, is_________________?
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A. 2h/Wa

B. Wa/h

C. Wa/2h

D. 2W/ha

1045. When an ideal fluid flows past a sphere________________?
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A. lowest pressure intensity occurs at rear stagnation point

B. lowest pressure intensity occurs at front stagnation point

C. total drag is zero

D. highest intensity of pressure occurs around the circumference at right angles to flow

1046. The motion of air mass in a tornado is a________________?
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A. free vortex motion

B. free vortex at center and forced vortex outside

C. forced vortex motion

D. forced vortex at center and free vortex outside
1047. The forces acting on the bar as shown in the given figure introduce________________?
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A. Shear stress

B. Tensile stress

C. Compressive stress

D. None of these

1048. If Ix and Iy are the moments of inertia of a section about X and Y axes, the polar moment of inertia of the section, is_________________?
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A. (I /I )

B. (IX IY)/2

C. (IX + IY)/2

D. IX + IY
1049. The point of contraflexure is the point where_______________?
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A. S.F. is zero

B. B.M. is maximum

C. B.M. is minimum

D. B.M. changes sign
1050. The strain energy due to volumetric strain________________?
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A. All the above

B. Is directly proportional to the square of exerted pressure

C. Is inversely proportional to Bulk modulus

D. Is directly proportional to the volume