### Civil Engineering - UPSC Civil Service Exam Questions MCQs Part 26

1. What is the correct sequence of the following events in rock tunnelling :1. Marking tunnel profile 2. Loading explosive and blasting3. Checking misfire 4. Muking5. Removing foul gas 6. Setting up and drilling7. GunnistingSelect the correct answer using the codes given below :

A.

1, 6, 5, 3, 4, 2, 7

1, 6, 5, 3, 4, 2, 7

B.

1, 2, 6, 3, 5, 4, 7

1, 2, 6, 3, 5, 4, 7

C.

1, 6, 2, 5, 4, 3, 7

1, 6, 2, 5, 4, 3, 7

D.

1, 6, 2, 5, 3, 4, 7

1, 6, 2, 5, 3, 4, 7

**Answer Option D**

2. Which of the following are the criteria associated with the design of sag vertical curve ?1. Provision of minimum stopping distance during day time2. Adequate drainage3. Comfortable operation4. Pleasant appearanceSelect the correct answer using the codes given below:

A.

1, 2 and 4

1, 2 and 4

B.

2 and 3

2 and 3

C.

2, 3 and 4

2, 3 and 4

D.

1 and 3

1 and 3

**Answer Option C**

3. Which one of the following is the correct statement ?Refractory bricks resist:

A.

high temperature

high temperature

B.

chemical action

chemical action

C.

dampness

dampness

D.

all the above three

all the above three

**Answer Option A**

4. The following quantities refer to a channel section used as a beam : b = width of flange (upto centre of web thickness).h = depth of web (c/c of flange thickness). t = thickness of flange and web.I = moment of inertia of channel about xx axis.e = distance of shear centre, outside the channel from the mid thickness of the web.The value of 'e' is given by

A.

tb2/4Ih2

tb2/4Ih2

B.

th2b2/4I

th2b2/4I

C.

h2I/4tb2

h2I/4tb2

D.

h2b2/4tI

h2b2/4tI

**Answer Option B**

5. Which of the following statements is NOT correct ?

A.

Chlorides in potable water may be present from 300 ppm to 500 ppm.

Chlorides in potable water may be present from 300 ppm to 500 ppm.

B.

In order to be safe against pathogenic bacteria residual chlorine should remain between 0.05 ppm and 0.20 ppm.

In order to be safe against pathogenic bacteria residual chlorine should remain between 0.05 ppm and 0.20 ppm.

C.

Presence of iron and maganese in excess of 0.3 ppm in dirinking water is objectionable.

Presence of iron and maganese in excess of 0.3 ppm in dirinking water is objectionable.

D.

pH value for pure water is nearly 7.

pH value for pure water is nearly 7.

**Answer Option A**

6. The velocity distribution for flow over a plate is given by u = 0.5 y - y2 where u is the velocity in m/s at a distance y metre above the plate. If the dynamic viscosity of the fluid is 0.9 N/m2, then what is the shear stress at 0.20 m from the boundary?

A. 0.9 N/m2

B. 1.8 N/m2

C. 2.25 N/m2

D. 0.09 N/m2

**Answer Option D**

7. Consider the following :1. Initial consolidation.2. Primary consolidation.3. Secondary consolidation.4. Final consolidation.The three stages which would be relevant to consolidation of a soil deposit includes

A. 1, 2 and 3

B. 2, 3 and 4

C. 1, 3 and 4

D. 1, 2 and 4

**Answer Option A**

8. Consider the following statements :1. Mastic asphalt is a mixture of hard grade bitumen or blown bitumen, minerals filter and fine aggregates.2. % of binder content in the mastic asphalt is 17-20 percent by weight of the aggregates. Which 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 C**

9. An element is subjected to stress as given in figure. For this state of stress, what is the maximum shear stress ?

A. 2.5 MPa

B. 5 MPa

C. 10 MPa

D. 15 MPa

**Answer Option B**

10. What is the maximum possible value of Poisson's ratio for a non-dilatant material ?

A. 0.67

B. 0.50

C. 0.33

D. 0.25

**Answer Option C**

11. Consider the following statements :Curing of concrete is necessary because(a) concrete needs more water for chemical reaction(b) it is necessary to protect the water initially mixed in concrete from being lost during evaporation(c) penetration of surrounding water increases the strength of concrete Which of the statements given above is/are correct ?

A. 1, 2 and 3

B. 1 and 3 only

C. 2 only

D. 3 only

**Answer Option C**

12. The combined correction for curvature and refraction for a distance of 1400 m is

A. 0.153 m

B. 0.132 m

C. 0.094 m

D. 0.021 m

**Answer Option B**

13. Given that for a soil deposit, K0 = earth pressure coefficient at rest, Ka = active earth pressure coefficient, Kp = passive earth pressure coefficient and u = Poisson's ratio, the value of (1 - μ) is given by

A. Ka/Kp

B. K0/Ka

C. KP/Ka

D. 1/K0

**Answer Option D**

14. In water treatment process, the chemical used for defluoridation is

A. Alum

B. Lime

C. Potassium permanganate

D. Sodium aluminate

**Answer Option A**

15. As elastic bar of length 'l', cross-sectional area A, Young's modulus of elasticity E and self-weight W is hanging vertically. It is subjected to a load P applied axially at the bottom end. The total elongation of the bar is given by.

A. WI/AE + PI/AE

B. WI/2AE + PI/AE

C. WI/2AE + PI/2AE

D. WI/AE + PI/2AE

**Answer Option B**

16. A gradually applied load W is suspended by with ropes AB and CD as shown in the figure. The wires AB and CD, made of the same material and of the same cross-section are connected to a rigid block from which the load W is suspended in such a way that both the ropes stretch by the same amount. If the stress in AB and CD are p1 and p2 respectively, then the ratio - will be

A.

B.

C.

D.

**Answer Option A**

17. For a state of plane stress σ1 = σx = 40 MPa, and σ2 = σy = 20MPa. What are the values of the maximum in-plane shearing stress and absolute maximum shearing stress ?

A. (± 10, 20) MPa

B. (± 10, 10) MPa

C. (± 20, 10) MPa

D. (± 20, 20) MPa

**Answer Option A**

18. A T-beam roof section has the following particulars :Thickness of slab 100 mmWidth of rib 300 mmDepth of beam 500 mmCentre to centre distance of beams 3.0 mEffective span of beams 6.0 mDistance between points of contraflexure is 3.60 m.The effective width of flange of the beam is

A. 3000 mm

B. 1900 mm

C. 1600 mm

D. 1500 mm

**Answer Option D**

19. A dry sand specimen is put through a triaxial test. The cell pressure is 50 kPa and the deviator stress at failure is 100 Pa. The angle of internal friction for the sand specimen is

A. 15°

B. 30°

C. 37°

D. 45°

**Answer Option B**

20. A channel of bed slope 0.0009 carries a discharge of 30 m3/s when the depth of flow is 1.0 m. What is the discharge carried by an exactly similar channel at the same depth of flow if the slope is decreased to 0.0001 ?

A. 10 m3/s

B. 15 m3/s

C. 60 m3/s

D. 90 m3/s

**Answer Option A**

21. Which one of the following would contain water with the maximum amount of turbidity ?

A. Lakes

B. Oceans

C. Rivers

D. Wells

**Answer Option C**

22. The following steps are necessary to obtain sufficient accuracy with the tape :1. Keeping uniform tension on tape for each measurement:2. "Breaking" tape on slopes are necessary to keep the tape level.3. Keeping accurate count of the stations.4. Keeping the tape on the line being measured.The correct sequence of these steps is

A. 4, 2, 1, 3

B. 2, 3, 4, 1

C. 4, 1, 2, 3

D. 3, 2, 1, 4

**Answer Option C**

23. A bar of length l is uniformly tapering from a diameter d1 at one and to a diameter d2 at the other end. The bar is subjected to an axial tensile loads. What is the total elongation (where E = Young's modulus of elasticity. )

A.

B.

C.

D. 4 +

**Answer Option A**

24. A welded steel plate girder consisting of two flange plates of 350 mm x 16 mm and a web plate of 1000 mm x 6 mm, requires

A. nostiffeners

B. vertical stiffeners

C. intermediate vertical stiffeners

D. vertical and horizontal stiffeners

**Answer Option C**

25. ABCD is a beam of length 5l which is supported at B and C (having supported length BC = 'l') and having two equal overhangs AB and CD of length 2l each. It carries a u.d.l. of intensity p per unit length throughout the beam as shown in the given figure.The points of contraflexure will occur

A. at B and C

B. no where in the beam

C. at the mid-point of BC

D. at the mid-points of AB and CD

**Answer Option C**

26. Which one of the following is employed to determine strength of hardened existing concrete structure ?

A. Bullet test

B. Kelly ball test

C. Rebound hammer test

D. Cone penetrometer

**Answer Option C**

27. Which one of following statements associated with groynes :1. Hydraulic behaviour of a system of groynes is influenced by the characteristics of particles that constitute the littoral drift.2. Groyne is constructed approximately parallel to shore.Which 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 C**

28. Reinforced concrete door and window frames can be compacted using :1. needle vibrator2. plate vibrator3. form vibrator4. tappingThe correct sequence of these equipment in order of preference (from the best to the worst) is

A. 2, 3, 4, 1

B. 3, 2, 1, 4

C. 2, 3, 1, 4

D. 3, 2, 4, 1

**Answer Option D**

29. If the Froude number of flow in an open channel is more than 1.0 then the flow is said to be

A. critical

B. shooting

C. streaming

D. transitional

**Answer Option B**

30. Due to some point load anywhere on a fixed beam, the maximum free bending moment is M. The sum of fixed end moment is

A. M

B. 1.5M

C. 2.0M

D. 3.0M

**Answer Option A**

31. In a particular material, if the modulus of rigidity is equal to the bulk modulus, then the Poisson's ratio will be

A.

B.

C.

D. 1

**Answer Option A**

32. The weight of aggregate having specific gravity 2.65, completely filled into a cylinder of volume 0.003 m3 is 5.2 kg. What is the value of the angularity index of aggregate (approximately) as given by Murdock ?

A. 1

B. 0.34

C. 0.15

D. 0.05

**Answer Option B**

33. Which of the following pairs in respect of ordinary Portland cement (OPC) are correctly matched1. Initial setting time....30 minutes2. Final setting time....10 hours3. Normal consistency....10%Select the correct answer from the codes given below :

A. 1, 2 and 3

B. 2 and 3

C. 1 and 2

D. 1 and 3

**Answer Option C**

34. A spillway of an irrigation project is to be studied by means of a model constructed to a scale of 1 : 9. The prototype discharge is 1000 m3/s. Neglecting the viscous and surface tension effects, the required flow rate for the model is

A. 12.35 m3/s

B. 111.11 m3/s

C. 4.11 m3/s

D. 1.37 m3/s

**Answer Option C**

35. Which one of the following is the correct differential equation of the shape of the cable (similar to electrical cables) of unit weight 'q' with small slopes, as shown in the given figure ?

A.

B.

C.

D.

**Answer Option A**

36. A reinforced concrete beam is designed for the limit states of collapse in flexure a shear. Which of the following limit states of serviceability have to be checked ? 1. Deflection 2. Cracking 3. Durability Select the correct answer using the codes given below :

A. 1 alone

B. 1 and 2

C. 2 and 3

D. 1, 2 and 3

**Answer Option C**

37. Two men, one stronger than the other have to lift a load of 1200 N which is suspended from a light rod of length 3 m. The load is suspended between the two persons positioned at the two ends of the rod. The weaker of the two persons can carry a load up to 400 N only. The distance of the load to be suspended from the stronger person such that the weaker person has the full share of 400 N is

A. 0.5 m

B. 1.0 m

C. 1.5 m

D. 2.0 m

**Answer Option D**

38. In a closed theodolite traverse, the sum of the latitudes is + 5.080 m and the sum of the departures is -51.406 m. The sum of the traverse legs is 20.525 km. The accuracy of traverse is nearly equal to

A. 1 : 300

B. 1 : 400

C. 1 : 500

D. 1 : 1000

**Answer Option B**

39. Consider the following statements :1. Pumps in series operation allow the head to increase.2. Pumps in series operation increase the flow rate.3. Pumps ill parallel operation increase the flow rate.4. Pumps in parallel operation allow the head to increase.Which of these statements are correct ?

A. 1 and 3

B. 1 and 4

C. 2 and 4

D. 3 and 4

**Answer Option A**

40. The shape factor for a solid circular section of diameter D is equal to

A.

B.

C.

D.

**Answer Option C**

41. What is the wave velocity for a uniform train of wave beyond the storm centre for a wave length of 20 m in 14 m deep water ?

A. 5.5 m/s

B. 11.2 m/s

C. 4.5 m/s

D. 9 m/s

**Answer Option C**

42. Maximum shear stress developed in a beam of rectangular section bears a constant ratio to its average shear stress and this ratio is equal to

A. 1.33

B. 1.5

C. 2.0

D. 2.5

**Answer Option B**

43. A circular pipe of radius R carries a laminar flow of a fluid. The average velocity is indicated as the local velocity at what radical distance, measured from the centre ?

A. 0.50 R

B. 0.71 R

C. 0.67 R

D. 0.29 R

**Answer Option B**

44. Radial splits in timber originating from 'Bark' and narrowing towards the 'Pith' are known as

A. heart shakes

B. star shakes

C. cup shakes

D. knots

**Answer Option B**

45. What is the condition for maximum transmission of power through a nozzle at the end of a long pipe ?(where H = total head at the inlet of the nozzle, hf = head loss due to friction )

A. H = hf/3

B. hf = H/2

C. hf = H/3

D. H = hf/2

**Answer Option C**

46. A simply supported beam AB of span L is subjected to a concentrated load W at the centre C of the span. According to Mohr's moment area method, which one of the following gives the deflection under the load ?

A. Moment of the area of M/EI diagram between A and C taken about C.

B. Moment of the area of M/EI diagram between A and B taken about B.

C. Moment of the area of M/EI diagram between A and C taken about A.

D. Moment of the area of M/EI diagram between A and C taken about B.

**Answer Option C**

47. A bar of circular cross-section varies uniformly from a cross-section 2D to D. If extension of the bar is calculated treating it as a bar of average diameter, then the percentage error will be

A. 10

B. 25

C. 33.33

D. 50

**Answer Option B**

48. While concreting in cold weather where frosting is also likely, one uses

A. high quality portland cement with minimum volumes of added water

B. high alumina cement with calcium chloride additives

C. portland cement together with calcium chloride additives

D. a mixture of high alumina cement and portland cement.

**Answer Option C**

49. A 600 mm long and 50 mm diameter rod of steel (E = 200 GPa, α = 12 x 10-6/°C) is attached at the ends to unyielding supports. When the temperature is 30°C there is no stress in the rod. After the temperature of the rod drops to - 20°C, the axial stress in the rod will be

A. 24 MPa (compressive)

B. 72 MPa (compressive)

C. 120 MPa (tensile)

D. 144 MPa (compressive)

**Answer Option C**

50. The correct sequence, in the direction of the flow of water for installations in the hydro-power plant is

A. reservoir, surge tank turbine, penstock

B. reservoir, penstock, surge tank, turbine

C. reservoir, penstock, turbine, surge tank

D. reservoir, surge tank, penstock, turbine

**Answer Option B**

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