### Civil Engineering - UPSC Civil Service Exam Questions MCQs Part 24

1. For Froude number of a hydraulic jump is 5.5. The jump can be classified as a/an:

A.

undularjump

undularjump

B.

oscillating jump

oscillating jump

C.

weak jump

weak jump

D.

steady jump

steady jump

**Answer Option D**

2. A cantilever pin-jointed truss carries one load P at the point Z as shown in the given figure. The hinges in the vertical wall are at A and D. The truss has only three horizontal members AC, CG and GZ.The nature of force in member AB

A.

is tensile

is tensile

B.

is zero

is zero

C.

is compressive

is compressive

D.

cannot be predicted

cannot be predicted

**Answer Option D**

3. A saturated stiff clay has unit weight 2 gm/cm3 and unconfined compressive strength 2 kg/cm2. The depth of tension crack that would develop in this clay is

A.

2 m

2 m

B.

5 m

5 m

C.

10 m

10 m

D.

20 m

20 m

**Answer Option A**

4. Consider the following statements :1. In a member subjected to uniaxial tensile force the maximum normal stress is the external load divided by the maximum cross-sectional area.2. When the structural member is subjected to uniaxial loading, the shear stress is zero on a plane where the normal stress is maximum.3. In a member subjected to uniaxial loading, the normal stress on the planes of maximum shear stress is less than the maximum.Of these statements :

A.

1 and 2 are correct

1 and 2 are correct

B.

1 and 3 are correct

1 and 3 are correct

C.

2 and 3 are correct

2 and 3 are correct

D.

1, 2 and 3 are correct

1, 2 and 3 are correct

**Answer Option A**

5. .The displacement thickness of a boundary layer is

A.

The distance to the point where (v/V) = 0.99

The distance to the point where (v/V) = 0.99

B.

the distance where the velocity v is equal to the shear velocity V∗ that is where v = V∗

the distance where the velocity v is equal to the shear velocity V∗ that is where v = V∗

C.

the distance by which the main flow is to be shifted from the boundary to maintain the continuity equation

the distance by which the main flow is to be shifted from the boundary to maintain the continuity equation

D.

one-half the actual thickness of the boundary layer

one-half the actual thickness of the boundary layer

**Answer Option A**

6. The axial load which just produces the condition of elastic instability in a column is

A. Rankine load

B. Euler load

C. Yield load

D. Crushing load

**Answer Option A**

7. If R is the radius of the circular railway curve in metres and D is the degree of the curve, then which one of the following is the expression for D ?

A. D = 360/R

B. D = 1080/R

C. D = 1720/R

D. D = 720/R

**Answer Option C**

8. Given below are methods of compaction :1. Vibration technique 2. Flooding the soil 3. Sheeps-foot roller 4. Tandem roller5. Heavy weights dropped from a height.The methods suitable for cohesionless soils include

A. 1, 2 and 3

B. 2, 3 and 4

C. 1, 2 and 5

D. 3, 4 and 5

**Answer Option C**

9. The ratio of torsional moments of resistance of a solid circular shaft of diameter D and a hollow shaft having external diameter D and internal diameter d is given by

A.

B.

C.

D.

**Answer Option A**

10. Consider the following statements relating to triaxial tests :1. Change in length of the specimen in a triaxial shear test is required to be accounted for in the calculation of stresses at failure.2. In 'Drained Triaxial Shear Test', drainage is permitted under a specified all-round pressure until consolidation is complete. The principal stress difference is then applied with no drainage being permitted.3. Unconfined compression test is a special case of triaxial shear test.Of these statements :

A. 1 and 2 are correct

B. 1 and 3 are correct

C. 2 and 3 are correct

D. 1, 2 and 3 are correct

**Answer Option D**

11. The given figure shows the arrow diagram for a particular project. The arrow 'A' is known as

A. critical activity

B. sub-critical activity

C. logic arrow

D. dummy activity

**Answer Option C**

12. In a plane strain problem in XY plane, the shear strain = 12 x 10-6, and the normal strain in X and Y direction = 0, For this state of strain, what is the diameter of the Mohr's Circle of strain ?

A. 6 x 10-6

B. 8 x 10-6

C. 12 x l0-6

D. 24 x l0-6

**Answer Option C**

13. A horizontal fixed beam is fixed at both it ends A and B. During loading, the right support sinks by an amount δ. Flexural rigidity of the beam is uniform and is equal to EI. Length of the beam is L. What is the moment developed at the centre of the beam due to sinking of the support ?

A. 6 EI δ/L2

B. zero

C. 3 EI δ/L2

D. 12 EI δ/L2

**Answer Option B**

14. A lighthouse is visible just above the horizon at a certain station at the sea level. The distance between the station and the lighthouse is 40 km. The height of the lighthouse is approximately

A. 187 m

B. 137.7 m

C. 107.7 m

D. 87.3 m

**Answer Option C**

15. Which of the following are the additional moments considered for design of slender compression member in lieu of deflectiion x and y directions ?(Where Pu is axial load; lex and ley are effective lengths in respective directions; D depth of section ⊥ to major axis; b width of the member)

A.

B.

C.

D.

**Answer Option C**

16. A close-coiled helical spring has 100 mm mean diameter and is mada of 20 turns to 10 mm diameter steel wire. The spring carries an axial load of 100 N Modulus of rigidity is 84 GPa. The shearing stress developed in the spring in N/mm2 is

A. 120/π

B. 160/π

C. 100/π

D. 80/π

**Answer Option D**

17. Consider the following statements pertaining to plane table survey :1. Two-point problem is solved by mechanical method.2. Three-point problem is solved by Bessel's method.3. In two point problem, auxiliary station is required.Of these statements :

A. 1 and 2 are correct

B. 1 and 3 arc correct

C. 2 and 3 are correct

D. 1, 2 and 3 are correct

**Answer Option D**

18. If a member is subjected to tensile stress of px, compressive stress of py and tensile stress of pz along the x, y and z directions respectively, then the resultant strain 'ex' along the 'x' direction would be (E is Young's modulus of elasticity, μ is Poisson's ratio)

A.

B.

C.

D.

**Answer Option D**

19. A cantilever is subjected to a uniformly distributed load W over its whole length 'L' and a concentrated upward force W at its free end. The deflection of the free end is

A. zero

B.

C.

D.

**Answer Option C**

20. The local sidereal time (LST) is always

A. ahead of the local mean time (LMT) by about 2 hours per month

B. behind LMT by about 2 hours per month

C. ahead of LMT by about 4 hours per month

D. equal to LMT

**Answer Option A**

21. Consider the following statements :I: To insert a 28 mm nominal diameter rivet, 29.5 mm rivet hole is made.II: Provision is made to allow temperature expansion of the bolt.

A. both I and II are true

B. I is true but II is false

C. I is false but II is true

D. both I and II are false

**Answer Option C**

22. Consider the following statements :A : For beams, I-sections are more economical than rectangular section. R : Most of the material is concentrated away from the centroid. Of these statements :

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is not a correct explanation of A

C. A is try but R is false

D. A is false but R is true.

**Answer Option A**

23. Two different granular soils are placed in a permeameter tube and flow is allowed to take place under a constant total head. The total head and pressure head at point A in centimeters, are respectively.

A. 75, 75

B. 25, 75

C. 25, 25

D. 75, 25

**Answer Option B**

24. When the degree of consolidation is 50%, the time factor is about

A. 0.2

B. 0.5

C. 1.0

D. 2.0

**Answer Option A**

25. General shrinkage in cement concrete is caused by

A. carbonation

B. stresses due to external load

C. drying the starting with a stiff consistency

D. drying starting with a wetter consistency.

**Answer Option D**

26. The distribution system configuration shown in the following figure is called

A. dead end system

B. grid iron system

C. radial system

D. ring system

**Answer Option B**

27. The phenomenon of reflection cracking is observed in which of the following ?

A. Bituminous overlays provided over cracked cement concrete pavements

B. Cement concrete overlays provided over cracked bituminous pavements.

C. Bituminous overlays constructed in cold weather

D. Cement concrete overlays provided over cement concrete pavements.

**Answer Option A**

28. What are the gases produced by landfills primarily comprised of?

A. Carbon monoxide and hydrogen sulphide.

B. Methane and carbondioxide

C. Sulphur dioxide and nitrogendioxide

D. Ethane and oxygen.

**Answer Option B**

29. Consider the following statements regarding specific energy of flow in an open channel :1. There is only one specific energy curve for a given channel.2. Alternate depths are the depths of flow at which the specific energy is the same.3. Critical flow occurs when the specific energy is minimum.Of these statements :

A. 1 and 2 are correct

B. 1 and 3 are correct

C. 2 and 3 are correct

D. 1, 2 and 3 are correct

**Answer Option D**

30. A motor shaft rotating with a speed of 90 rpm decelerates uniformly when the motor is switched off and stops in 40 sec. The number of revolutions made by the shaft in this time would be

A. 10

B. 20

C. 30

D. 40

**Answer Option C**

31. Which one of the following statements is correct ?The portal method of structural analysis is generally suitable for

A. tall buildings

B. low-rise buildings

C. low-rise buildings with uniform framing

D. low-rise buildings with non-uniform framing.

**Answer Option D**

32. How high should a helicopter pilot rise at a point. A just to see the horizon at point B, if the distance AB is 40 km ?

A. 101.75 m

B. 110.50 m

C. 107.75 m

D. 105.50 m

**Answer Option C**

33. A cantilever beam 'A' with rectangular cross-section is subjected to a concentrated load at its free end. If width and depth of another cantilever beam 'B' are twice those of beam A, then the deflection at free end of the beam 'B' as compared to that of 'A' will be

A. 6.25%

B. 14%

C. 23.6%

D. 28%

**Answer Option A**

34. A bar of square section is subjected to a pull of 10000 kg. If the maximum allowable shear stress on any section is 500 kg/cm2, then the side of the square section will be

A. 5 cm

B. 10 cm

C. 15 cm

D. 20 cm

**Answer Option B**

35. A clay sample has a void ratio of 0.54 in dry state. The specific gravity of soil solids is 2.7. What is the shrinkage limit of the soil ?

A. 8.5%

B. 10.0%

C. 17.0%

D. 20.0%

**Answer Option D**

36. Consider the following statements related to Los Angeles Abrasion test on aggregates :1. It evaluates hardness of source - rock2. It has a coefficient of variation of about 30 percentWhich of the statements given above is/are correct ?

A. 1 only

B. 2 only

C. Both 1 and 2

D. Neither 1 nor 2

**Answer Option A**

37. A bar of uniform cross-section of 400 mm2 is loaded as shown in the figure. The stress at section 1-1 is

A. 50 N/mm2

B. 100 N/mm2

C. 25 N/mm2

D. 200 N/mm2

**Answer Option B**

38. Due to settlement of support at A of propped cantilever shown in the figure given below, what is the vertical reaction at B ?

A.

B.

C.

D.

**Answer Option B**

39. A wooden plank (sp. gr. 0.5) 1 m x 1 m x 0.5 m floats in water with 1.5 kN load on it with 1 m x 1 m surface horizontal. The depth of plank lying below water surface shall be

A. 0.178 m

B. 0.250 m

C. 0.403 m

D. 0.500 m

**Answer Option C**

40. A parabolic vertical curve is to be set out connecting two uniform grades of +0.6% and +.0%. The rate of change of grade is to be 0.06% per 30 m. The length of the curve will be

A. 66 2/3 m

B. 133 1/3 m

C. 200 M

D. 266 2/3 m

**Answer Option A**

41. For an activity 201-207 in an AOA network, the EET values, LET values and activity duration are shown in the figure. Between free float, interference float and independent float, which one of the following is the correct sequence in the decreasing magnitude order ?

A. Free float - Interference float - Independent float

B. Free float - Independent float - Interference float

C. Interference float - Free float - Independent float

D. Interference float - Independent float - Free float

**Answer Option C**

42. Consider the following statements :1. Dock is a marine structure for mooring up vessels, loading and unloading of passengers and/or cargo.2. Dry dock is generally used only for carrying out repairs, inspections and painting.3. Wet dock is an enclosed or partially enclosed basin provided with locks and entrance gate to keep the water level at a fairly constant level.Which of the statements given above are correct ?

A. 1, 2 and 3

B. 2 and 3

C. 1 and 2

D. 1 and 3

**Answer Option A**

43. Which one of the following statements is true to trickling filter sludge ?

A. It has a comparatively low sludge volume index

B. It is more difficult to dewater than activated sludge

C. It has a comparatively low concentration of sludge solids

D. It is bulky

**Answer Option A**

44. In the case of a column of length 'l', moment of inertia of cross-section 'I' and Young's modulus of the material of the column 'E' being hinged at both ends, the buckling load, according to Euler's colum

A.

B.

C.

D.

**Answer Option C**

45. What is the correct sequence of the following steps in the graphical determination of stresses in the members of a loaded plane truss ?1. Vector diagram to determine the end reactions.2. Space diagram.3. Stress diagram.Select the correct answer using the codes given below :

A. 1, 2, 3

B. 1, 3, 2

C. 2, 1, 3

D. 2, 3, 1

**Answer Option A**

46. A steel rod of 16 irim diameter has been used as a tie in a bracing system, but may subject to possible reversal of stress due to the wind. What is the maximum permitted length of the member ?

A. 1600 mm

B. 1400 mm

C. 1200 mm

D. 1000 mm

**Answer Option B**

47. The total number, of independent equations that form the Lacey's regime theory is

A. 2

B. 3

C. 4

D. 6

**Answer Option B**

48. The following methods are used for structural analysis :1. Macaulay method 2. Column analogy method3. Kani's method 4. Method of sectionsThose used for indeterminate structural analysis would include

A. 1 and 2

B. 1 and 3

C. 2 and 3

D. 2, 3 and 4

**Answer Option C**

49. In the case of S2 water surface profile (y = depth of flow, y0 = normal depth, yc = critical depth)

A. y0 > yc > y

B. yc > y0 > y

C. yc > y > y0

D. y > yc > y0

**Answer Option C**

50. A summit vertical curve is to be set joining + 2 percent grade with -3 percent grade. If the tangents interest at an elevation of 60 m and the rate of change of grade is - 1 percent per 100 m, then the elevation of the beginning point of the vertical curve will be

A. 58.5 m

B. 57.5 m

C. 55.0 m

D. 52.5 m

**Answer Option C**

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