### Civil Engineering - UPSC Civil Service Exam Questions MCQs Part 22

1. A bar 4 cm in diameter is subjected to an axial load of 41. The extension of the bar over a gauge length of 20 cm is 0.03 cm. The decrease in diameter is 0.0018 cm. The Poisson's ratio is

A.
0.25
B.
0.30
C.
0.33
D.
0.35

2. The kinetic energy in Nm of a circular disc of 20 m diameter and 10 cm thick, of material weighing 100 kg/m3, rotating above an axis through its centre at right angles to its place and making 2000 rpm is

A.
B.
C.
2 x 108 π3
D.
4 x 108 π3

3. The upper limit of area ratio for which the amount of disturbance of soil sample can be considered to be small is

A.
10%
B.
15%
C.
20%
D.
25%

4. For the beam shown in figure, what are the distribution factors at joint B ?

A.
0.4, 0.6
B.
0.5, 0.5
C.
0.6, 0.4
D.
0.65, 0.35

5. Consider the following statements :The daily per capita consumption of water apparently increases with1. higher standard of living of people.2. availability of sewerage in the city.3. metered water supply.4. wholesome and potable quality of water.Which of these statements are correct ?

A.
1, 2 and 3
B.
2, 3 and 4
C.
1, 3 and 4
D.
1, 2 and 4

6. A river model is constructed to a horizontal scale of 1:1000 and a vertical scale of 1:100. A model discharge in the prototype, of what magnitude ?

A. 102 m3 /s
B. 103 m3 /s
C. 104 m3 /s
D. 105 m3 /s

7. If a 30 m length can be taped with a precision of ± 0.01 m, then the standard error of measuring 1.08 km with the same precision will be

A. ± 0.54 m
B. ± 0.45 m
C. ± 0.36 m
D. ± 0.06 m

8. a grit chamber of dimensions 12.0 m x 1.50 x 800 m liquid depth has a flow of 720 m3/hr. Its surface loading rate and detention time are, respectively,

A. 40000 m3/hr/m2 and 1.2 minute
B. 40000 1 ph/m2 and 40 minutes
C. 40 m/hr/m2 and 12 minutes
D. 40000 1 ph/m2 and 1.2 minute

9. In signals system design of Railways the distance at which the outer signal is to be placed is decided on basis of the

A. Allowable speed
B. Running speed
C. Minimum speed
D. Journey speed

10. Which one of the following is the best method for the stabilization of the clayey subgrade in water-logged area ?

A. Cement stabilization
B. Lime stabilization
C. Bitumen stabilization
D. Stabilization by grouting

11. The stress distribution at a depth beneath a loaded area is determined using Newmark's influence chart which indicates an influence value of 0.005. The number of segments covered by the loaded area in the chart is 20 and the intensity of loading on the area is 10 T/m2. The intensity of stress distribution at that depth is

A. 1 T/m2
B. 2 T/m2
C. 5 T/m2
D. 10 T/m2

12. A two-hinged semicircular arch of radius 'R' carries a concentrated load 'W' at the crown. The horizontal thrust is

A.
B.
C.
D.

13. The adjoining figures show funicular diagram and polar diagram for a beam subjected to vertical forces. x is the distance of the pole from the vector line. If x is doubled, then the ordinate in the funicular diagram will be

A. doubled
B. halved
C. unaffected
D. tripled

14. In a cohesionless soil deposit having a unit weight of 1.5 t/m3and an angle of internal friction of 30° the active and passivelateral earth pressure intensities (in t/m2) at a depth of 10 m will, respectively, be

A. 15 and
B. 5 and 15
C. 10 and 20
D. 20 and 10

15. A three-hinged loaded semicircular arch ACB is shown in the figure given. What is the shearing force at the hinge C ?

A. 20 kN
B. 20 2 kN
C. 10 kN
D. 10 2 kN

16. A clay sample has a void ratio of 0.50 in dry state and specific gravity of solids = 2.70. Its shrinkage limit will be

A. 12%
B. 13.5%
C. 18.5%
D. 22%

17. A catchment has an area of 150 hectares and a run-off/rainfall ratio of 0.40. If due to 10 cm rainfall over the catchment, a stream flow at the catchment outlet lasts for 10 hours, what is the average stream flow in the period ?

A. 60, 000 m3/hour
B. 100 m3/minute
C. 3.5 m3/s
D. 1.33 m3/s

18. The head loss in a pipe of diameter d, carrying oil at a flow rate Q over a distance l is h. The pipe is replaced by another with half the diameter, all other things remaining the same. The head loss in this case will be

A. 0.5 h
B. 2.0 h
C. 8.0 h
D. 32.0 h

19. A very tiny sphere is settling down in a viscous liquid at Reynolds number = 0.2. Its drag coefficient is equal to

A. 320
B. 120
C. 80
D. 5

20. An ascending gradient of 1 in 100 meets a descending gradient of 1 in 50, The length of summit curve required to provide overtaking sight distance of 500 m will be

A. 938 m
B. 781m
C. 470 m
D. 170 m

21. In a situation where torsion is dominant, which one of the following is the desirable section ?

A. Angle section
B. Channel section
C. I-section
D. Box type section

22. Consider the following statements :(a) Setting and hardening of cement takes place after the addition of water.(b) Water causes hydration and hydrolysis of the constituent compounds of cement which act as bindersWhich of the statements given above is/are correct ?

A. 1 only
B. 2 only
C. Both 1 and 2
D. Neither 1 nor 2

23. The effective length of the member shown in the given figure is equal to

A. 1.2 L
B. 1.5 L
C. 2.0 L
D. 3.0 L

24. A surface longitudinally centered on the extended runway centre line and extending outward and upward from each end of the primary surface is known as

A. conical surface
B. transition surface
C. approach surface
D. horizontal surface

25. A flownet for an earth dam on impervious foundation consists of 4 flow channels and 15 equipotential drops. The full reservoir level is 15 m above the downstream horizontal filter. Given that horizontal permeability is 9 x 10-6 m/s and vertical permeability is 1 x 10-6 m/s, the quantity of seepage through the dam will be

A. 36 ml/s/m
B. 25 ml/s/m
C. 20 ml/s/m
D. 15 ml/s/m

26. Which of the following are the disadvantages of non-tilting type concrete mixers ?1. They are not favoured when large sized aggregates are used.2. Mixing of the concrete occurs through both rolling and pulling from buckets.3. Content of fines is increased.4. They are not easy to clean.Select the correct answer using the codes given below:

A. 1, 2 and 3
B. 1, 3 and 4
C. 1, 2 and 4
D. 2, 3 and 4

27. A round bar made of same material consists of 3 parts each of 100 mm length having diameters of 40 mm, 50 mm and 60 mm respectively. If the bar is subjected to an axial load of 10 kN, the total elongation of the bar would be (E is the modulus of elasticity in kN/mm2)

A.
B.
C.
D.

28. Which of the following factors have to be considered for the design of the flexible pavement for a highway ?1. Design wheel load2. Strength of pavement component material3. Expansion joints4. Climatic factorsSelect the correct answer using the codes given below :

A. 1, 2 and 3
B. 2, 3 and 4
C. 1, 3 and 4
D. 1, 2 and 4

29. For practically impervious type of soil, the coefficient of permeability is determined using

C. consolidation test
D. pumping test

30. The basic action involved in sheep foot rolling is

B. Pressing
C. Tamping
D. Vibration

31. Consider the following oxides : 1. Al2O32. CaO3. SiO2The correct sequence in increasing order of their percentage in an ordinary portland cement is

A. 2, 1, 3
B. 1, 3, 2
C. 3, 1, 2
D. 1, 2, 3

32. The modules of elasticity (E) of concrete is given by

A. E = 1000 fck
B. E = 5700 fck
C. E = 5700 fck
D. E = 10, 000 fck

33. A 6 hour storm has 6 cm of rainfall and the resulting runoff was 3 cm. If φ = index remains at the same value, which one of the following is the runoff due to 12 cm of rainfall in 9 hours in the catchment?

A. 4.5 cm
B. 6.0 cm
C. 7.5 cm
D. 9.0 cm

34. In the plot of residual chlorine versus chlorine dose applied shown in the above figure, the curve will not have any (0, 0) point because

A. of experimental error
B. chlorine escapes into the atmosphere
C. chlorine requires some contact time
D. chlorine is consumed for disinfection

35. Which of the following pairs regarding the defects in timber are correctly matched ?1. Upsets....due to overmaturity and unventilated star age of wood.2. Fwciness....due to crushing of fibres running transversel.3. Star shakes....radial splits widest at the circumference and diminishing towards the centre.4. Heart shakes....cracks widest at the centre and diminishing towards the outer circumference.Select the correct answer using the codes given below.

A. 1 and 2
B. 3 and 4
C. 1 and 4
D. 2 and 4

36. The description of solid waste collected is as follows :Night soil - 35 tRubbish - 40 tDebris - 25 tGarbage - 40 tThe organic solids in the above composition is

A. 35 t
B. 60 t
C. 100 t
D. 75 t

37. Lacustrine soils are soils

A. transported by rivers and streams
B. transported by glaciers
C. deposited in sea beds
D. deposited in lake beds

38. If a sluice gate produces a change in the depth of water from 3.0 m to 0.6 m, then the force on the gate is about

A. 9.5 kN/m
B. 19.0 kN/m
C. 38.0 kN/m
D. 76.0 kN/m

39. When the bubble of a level tube was moved by 10 divisions, the change in staff intercept was 0.05 m. If the distance between the staff and the instrument was 100 m, then the senstitiveness of the bubble tube is given by

A. 1.03 sec of arc
B. 10.3 sec of arc
C. 20.6 sec of arc
D. 103 sec of arc

40. Self-cleansing velocity is

A. the minimum velocity of flow required to maintain a certain amount of solids in the flow
B. the maximum velocity of flow required to maintain a certain amount of solids in the flow
C. such flow velocity as would be sufficient to flush out any deposited solids in the sewer
D. such flpw velocity as would be sufficient to ensure the sewage does not remain in the sewer

41. What is the total degree of indeterminancy, both internal and external of the plane frame ?

A. 10
B. 11
C. 12
D. 14

42. In the design of two-way slab restrained at all edges, torsional reinforcement required is :

A. 0.75 times the area of steel provided at midspan in the same direction
B. 0.375 times the area of steel provided at midspan in the same direction
C. 0.375 times the area of steel provided in the shorter span
D. Nil

43. Two bars AO and BO are of uniform area 'A' each and are hinged at O as shown in the given figure. A load W is applied at O. The vertical deflection of O will be

A.
B.
C.
D.

44. The length of a transition curve for a circular curve of radius 300 m and for a design speed of 15 m/s, when the rate of change of centrifugal acceleration is 0.3 m/s3 is

A. 30 m
B. 37.5 m
C. 45 m
D. 60 m

45. Two closed-coil springs of stiffness s and 2s are arranged in series in one case and in parallel in the other case. The ratio of stiffness of springs connected in series to parallel is

A.
B.
C.
D.

46. The rigid portal frame shown in the given figure will not have any sidesway ifI1 = the moment of inertia of the column cross-section I2 = the moment of inertia of the beam cross-section

B. I2 = 2I1

47. Two similar round bars A and B are each 30 cm long as shown in the given figure. The ratio of the energies stored by the bars A and B, is

A. 3/2
B. 1.0
C. 5/8
D. 2/3

48. Consider the following statements :The effect of air entrainment in concrete is to1. increase resistance to freezing and thawing.2. improve workability.3. decrease strength.Which of these statements are correct ?

A. 2 and 3
B. 1 and 3
C. 1 alone
D. 1, 2 and 3

49. The state of stress at a point in a stressed element is shown in the given figure. The maximum tensile stress in the element will be

A. 20 N/mm2
B. lO2 N/mm2
C. 10 N/mm2
D. zero

50. The shear modulus of a material is half of its Young's modulus. What is the value of its Poisson's ratio ?

A. - 1
B. - 0.5
C. Zero
D. 0.5