### Civil Engineering - UPSC Civil Service Exam Questions MCQs Part 19

1. A rectangular channel of 2.5 m width and 2 m depth of water carries a flow of 10 m3/s. The specific energy for the flow is given by

A.

1.18 m

1.18 m

B.

3.4 m/s

3.4 m/s

C.

2.0 m/s

2.0 m/s

D.

2.2 m

2.2 m

**Answer Option D**

2. Which of the following pollutants is responsible for depletion of ozone layer ?

A.

Unburnt hydrocarbon

Unburnt hydrocarbon

B.

UV rays

UV rays

C.

Chlorofluoro carbons

Chlorofluoro carbons

D.

Oxides of nitrogen

Oxides of nitrogen

**Answer Option C**

3. If a composite bar of steel and copper is heated, then the copper bar will be subjected to

A.

compression

compression

B.

shear

shear

C.

tension

tension

D.

torsion

torsion

**Answer Option A**

4. Consider the following discharge measurement devices :1. Cylindrical mouthpiece flowing full2. Sharp-edged orifice3. Convergent-divergent mouthpiece4. Borda's re-entrant mouthpiece flowing freeThe correct sequence of increasing order of their discharge coefficients is

A.

4-2-1-3

4-2-1-3

B.

4-2-3-1

4-2-3-1

C.

2-4-3-1

2-4-3-1

D.

2-4-1-3

2-4-1-3

**Answer Option A**

5. A square framework formed of uniform heavy rods of equal weight joined together is hung by one corner. A weight W is suspended from each of the three lower corners and the shape of the square is preserved .with the help of a light rod along the horizontal diagonal. The thrust of the light rod is

A.

2 W

2 W

B.

3 W

3 W

C.

4 W

4 W

D.

6 W

6 W

**Answer Option C**

6. The maximum bending moment at the left quarter point of a simple beam due to crossing of UDL of length shorter than the span in the direction left to right, would occur after the load had just crossed the section by

A. one-fourth of its length

B. half of its length

C. three-fourth of its length

D. its full length

**Answer Option C**

7. The formulation for BOD assimilation in a stream should include

A. BOD rate constant

B. Sedimentation of organic matter

C. BOD rate constant and sedimentation of organic matter

D. Pathogenic bacterial decay coefficient

**Answer Option A**

8. A truss is shown in the given figure. The cross-sectional area of each member is 'A' and the modulus of elasticity of the material is E. The strain energy in the member XY is given by

A. P2L/2AE

B. P2L/QAE

C. P2L/3AE

D. zero

**Answer Option D**

9. For the simply supported beam shown in the given figure, at what distance from the support A, is the shear force zero?

A.

B.

C.

D.

**Answer Option D**

10. The elements that are normally subjected to combined bending and axial forces are

A. struts in reinforced concrete members

B. the members in long span bridges

C. columns in framed structures

D. space truss members

**Answer Option C**

11. A uniform simply supported beam is subjected to a clockwise moment at the left end. What is the moment required at the right end so that rotation of the right end is zero ?

A. 2 m

B. m

C. m/2

D. m/3

**Answer Option B**

12. A cylindrical bar of 20 mm diameter and 1 m length is subjected to a tensile test. Its longitudinal strain is 4 times that of its lateral strain. If the modulus of elasticity is 2 x 105 N/mm2, then its modulus of rigidity will be

A. 8 x 106 N/mm2

B. 8 x 105 N/mm2

C. 0.8 x lO4 N/mm2

D. 0.8 x 105 N/mm2

**Answer Option D**

13. Clapeyron's theorem is applied to

A. simply supported beam

B. fixed and continuous beam

C. propped cantilever beam

D. continuous beam only

**Answer Option C**

14. A fill having a volume of 150, 000 cm is to be constructed at a void ratio of 0.8. The borrow pit soil has a void ratio of 1.4. The volume of soil required (in cubic metres) to be excavated from the borrow pit will be

A. 1, 87, 500

B. 2, 00, 000

C. 2, 10, 000

D. 2, 50, 000

**Answer Option B**

15. A fixed beam as shown in Fig. I is loaded with a U.D.L. over the entire span, the total load being W; when load was just increased to W1, the deformed shape as shown in Fig. II was seen. The value of W1 (plastic moment of resistance = Mp) is

A.

B.

C.

D.

**Answer Option B**

16. The resultant of the coplanar, concurrent system of forces F1, F2, F3 and F4 shown in the above figure is

A. 20kN acting vertically upwards

B. zero

C. 20 kN acting vertically downwards

D. 20 kN acting horizontally from left to right

**Answer Option B**

17. During seepage through an earth mass, the direction of seepage is

A. parallel to the equipotential lines

B. perpendicular to the stream lines

C. perpendicular1 to the equipotential lines

D. along the direction of gravity

**Answer Option C**

18. Consider the following statements :The effect of sea water on hardened concrete is to1. increase its strength2. reduce its strength 3. retard setting 4. decrease its durability. Of these statements :

A. 1 and 3 are correct

B. 2 and 3 are correct

C. 2 and 4 are correct

D. 1 and 4 are correct

**Answer Option C**

19. A doubly reinforced concrete beam has effective cover d' to the centre of compression reinforcement. xu is the depth of neutral axis, and d is the effective depth to the centre of tension reinforcement. What is the maximum strain in concrete at the level of compression reinforcement?

A. 0.0035 (1 - d'/d)

B. 0.0035(1 - d'/xu)

C. 0.002(1 - d'/xu)

D. 0.002(1 - d'/d)

**Answer Option B**

20. By what percentage is length of a runway increased for every 300 m rise above M.S.L. ?

A. 3%

B. 4%

C. 6%

D. 7%

**Answer Option D**

21. The percentage of time in a year during which the cross wind component remains within the limit, is :

A. Wind coverage

B. Headwind

C. Prevailing wind

D. Cross wind

**Answer Option A**

22. Consider the following statements :A concrete mixer is specified by the :1. volume of the mixing drum.2. horse power of the prime mover.3. volume of mixed concrete discharged.4. mixer drum speed.5. feeding arrangement.Of these statements :

A. 1, 2 and 5 are correct

B. 1, 3 and 4 are correct

C. 3 and 5 are correct

D. 2 and 4 are correct

**Answer Option B**

23. Choose the correct statement about horizontal component of resultant hydrostatic pressure on a curved submerged surface :

A. It is equal to the product of pressure at the centroid and the curved area

B. It is equal to the weight of the liquid above the curved surface acting at 0.5 depth of the surface

C. It is equal to the projected area of the surface on a vertical plane multiplied by the pressure at the centre of gravity of area

D. It is equal to the weight of the liquid above the curved surface multiplied by the projected area on a vertical plane.

**Answer Option C**

24. A circular area of radius 'R' on the surface of a semi-infinite soil mass is uniformly loaded with a loading intensity of 'q'. The vertical stress σz directly below its centre at a depth 'z', is given by

A.

B.

C.

D.

**Answer Option C**

25. The thickness of web for unstiffened plate girder with clear distance d between the flanges shall not be less than

A.

B.

C.

D.

**Answer Option B**

26. A simply supported beam of span 'L' and uniform flexural rigidly EI, carries a central load 'W' and total uniformly distributed load 'W' throughout the span. The maximum deflection is given by

A. 13 WL3/96 EI

B. 5 WL3/384 EI

C. 5 WL3/96 EI

D. 13 WL3/384 EI

**Answer Option D**

27. In the design of storm sewers, time of concentration relevant of determine the

A. rainfall intensity

B. velocity in the sewer

C. time of travel

D. area seven by the sewer

**Answer Option A**

28. Given that the density of earth is ω, the angle of repose is φ and h is the height of the wall and the earth retained is level, the active earth Pressure 'P' on retaining wall is given by

A.

B.

C.

D.

**Answer Option B**

29. A cantilever carries a load P at C as shown in the given figure. The deflection at B is

A.

B.

C.

D.

**Answer Option D**

30. As the elevation increases, the runways length has to be changed at what rate ?

A. Decreased @ 5% per 300 m rise in elevation above M.S.L.

B. Increased @ 7% per 300 m rise in elevation above M.S.L.

C. Decreased @ 9% per 300 m rise in elevation above M.S.L.

D. Increased @ 15% per 300 m rise in elevation above M.S.L.

**Answer Option B**

31. Which one of the following statements is correct ?In a plane truss, influence line values

A. vary parabolically between panel points

B. vary exponentially between panel points

C. vary linearly between panel points

D. vary following a cubic relationship between panel points

**Answer Option C**

32. In a 4 m wide rectangular channel with 0.8 m depth of flow, a sharp-crested weir of 2.5 m length with its sill 0.3 m above the channel bed is fixed symmetrically across the width of the channel. Taking the flow to be free but with end contractions, what would be the discharge neglecting approach velocity effect? (Take Cd = 0.625)

A. 1.39 m3/s

B. 1.42 m3/s

C. 1.49 m3/s

D. 1.56 m3/s

**Answer Option D**

33. A structural member carrying a pull of 700 kN is connected to a gusset plate using rivets. If the pulls required to shear the rivet, to crush the rivet and to tear the plate per pitch length are respectively 60 kN, 35 kN and 70 kN, then the number of rivets required will be

A. 22

B. 20

C. 18

D. 12

**Answer Option B**

34. In the cantilever truss shown in the given figure, the reaction at A is

A. 10 t

B. 20 t

C. 30 t

D. 40 t

**Answer Option C**

35. The degree of indeterminacy of the beam given in the given figure is

A. zero

B. one

C. two

D. three

**Answer Option D**

36. Following data refer to precise measurement of an angle A on the field : (i) 2A = 20°10' - weight 2 (ii) 4A = 40°10' - weight 3What is the most probable value of angle A ?

A. 10°01'06"

B. 10°02'07"

C. 10°02'51"

D. 10°22'51"

**Answer Option C**

37. A torsion member is fabricated from two concentric thin tubes. At the ends, the tubes are welded to rigid discs so that both the tubes are twisted as a unit. The radius of the outer tube is 2r and that of the inner tube is r. If the shear stresses developed in the outer tube is τ, then the shear stress in the inner tube will be.

A. τ

B. 0.25 τ

C. 0.75 τ

D. 0.5 τ

**Answer Option D**

38. Figure given below shows a fixed beam of steel: At the point of collapse, the value of load W will be

A.

B.

C.

D.

**Answer Option C**

39. A mild steel flat of width 120 mm and thickness 10 mm is bent into an arc of a circle of radius 10 m by applying a pure moment 'M' If E is 2 x 105 N/mm2, then the magnitude of the pure moment 'M' will be

A. 2 x 106 N-mm

B. 2 x 105 N-mm

C. 0.2 x 105 N-mm

D. 0.2 x 104 N-mm

**Answer Option B**

40. The deflection at the free end of a uniformly loaded cantilever of length 1 m is 7.5 mm. What is the slope at the free end ?

A. 0.01 radian

B. 0.015 radian

C. 0.02 radian

D. 0.025 radian

**Answer Option A**

41. What will be the curve lead for a 1 in 8 1/2 turnout taking off from a straight broad gauge track?

A. 28.49 m

B. 21.04 m

C. 14.24 m

D. 7.45 m

**Answer Option A**

42. A timber beam of 100 mm width and 200 mm depth is reinforced with two steel plates of 100 mm width and 5 mm thickness as shown in figures. Which one of the following statements is correct for the same value of bending stress in the timber ?

A. Moment of resistance in figure I will be more than that in figure II

B. Moment of resistance in figure II will be more than that in figure I

C. Moment of resistance in figure I will be equal to that in figure II

D. No logical comparison can be made

**Answer Option A**

43. The following statements relate to the pressure exerted by a fluid on a Submerged curved surface :1. The vertical component of hydrostatic force acting on a submerged curved surface acts through the centre of volume of the fluid directly above the submerged area.2. The horizontal component of the force acting on a curved surface is the hydrostatic force acting on the vertical projection of the curved surface.3. The resultant force on a curved surface acts on the bottom of th6 curved surface.Of these statements :

A. 1, 2 and 3 are correct

B. 2 and 3 are correct

C. 1 and 2 are correct

D. 1 and 3 are correct

**Answer Option C**

44. The lost time due to starting delay on a traffic signal is noted to be 3s, the actual green time is 25s and yellow time is 3s. How much is the effective green time ?

A. 31s

B. 28s

C. 25s

D. 22s

**Answer Option C**

45. Consider the following locations of a turnout:1. Tongue rail2. Lead rail3. Toe of switch4. Crossing.Which is the correct sequence for a train to pass over the turnout from the facing direction?

A. 3 - 1 - 2 - 4

B. 4 - 2 - 1 - 3

C. 3 - 2 - 1 - 4

D. 4 - 1 - 2 - 3

**Answer Option A**

46. Which one of the following expresses the height of rise or fall of a liquid in a capillary tube ?(w = Specific weight of the liquid α = Angle of contact of the liquid surface σ = Surface tension)

A.

B.

C.

D.

**Answer Option C**

47. Given that Plasticity Index (PI) of local soil = 15 and PI of sand = zero, for a desired PJ of 6, the percentage of sand in the mix should be

A. 70

B. 60

C. 40

D. 30

**Answer Option B**

48. Two closely-coiled springs A and B of the same material, same wire and same number of turns are subjected to an axial load of W. The mean diameter of spring A is half that of spring B. The ratio of deflection of spring B to that of spring A will be

A. 8

B. 4

C. 1/4

D. 1/8

**Answer Option C**

49. A column ABCD (2y1 x 2y2) of rectangular section carries a load P at Z having the co-ordinates (x, y) as shown in the given figure.If the compressive streses are taken as positive and area A = 2y1 x 2y2 = 4y1 y2 and the moment of inertia about x and y axis being Ixx and Iyy respectively, then the stress at the corner D is

A.

B.

C.

D.

**Answer Option B**

50. What are leaping weirs ?

A. sewage flow measuring devices

B. storm regulators

C. velocity control devices

D. sewer out falls

**Answer Option B**

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