### Civil Engineering - GATE Exam Questions MCQs Part 2

1. In a reinforced concrete beam-column, the increase in the flexural strength along with the increase in the axial strength occurs

A.

beyond the elastic limit of the material

beyond the elastic limit of the material

B.

when the yield of the tension reinforcement governs the strength

when the yield of the tension reinforcement governs the strength

C.

when the crushing of the concrete in the compression zone governs the strength

when the crushing of the concrete in the compression zone governs the strength

D.

never

never

**Answer Option B**

2. The group efficiency of a pile group

A.

will be always less than 100%.

will be always less than 100%.

B.

will be always greater than 100%.

will be always greater than 100%.

C.

may be less than 100% or more than 100%.

may be less than 100% or more than 100%.

D.

will be more than 100% for pile groups in cohensionless soils and less than 100% for those in cohesive soils.

will be more than 100% for pile groups in cohensionless soils and less than 100% for those in cohesive soils.

**Answer Option D**

3. A wastewater sample contains 10-5.6 mmol/l of OH ions at 25° C. The pH of this sample is

A.

8.6

8.6

B.

8.4

8.4

C.

5.6

5.6

D.

5.4

5.4

**Answer Option D**

4. At a rated capacity of 44 Cumecs, a centrifugal pump develops 36 m of head when operating at 1450 rpm. Its specific speed is :

A.

654

654

B.

509

509

C.

700

700

D.

90

90

**Answer Option A**

5. Presence of ifluoride in water greater than permissible level of 1.5 mg/l causes

A.

cardiovascular disease

cardiovascular disease

B.

methemoglobinemia

methemoglobinemia

C.

hepatitis

hepatitis

D.

dental fluorosis

dental fluorosis

**Answer Option D**

6. The values of liquid limit and plasticity index for soils having common geological origin in a rectricted locality usually define

A. A zone above A-line

B. A straight line parallel to A-line

C. A straight line perpendicular to A-line

D. Points may be anywhere in the plasticity chart

**Answer Option B**

7. M - θ relationship for a simply supported beam shown below is given by :

A. M l/EI = 2θ

B. M l/EI = 3θ

C. M l/EI = 4θ

D. M l/EI = 6θ

**Answer Option C**

8. The number of revolutions of a current meter in 50 seconds were found to be 12 and 30 corresponding to the velocities of 0.25 and 0.46 m/s respectively. What velocity (in m/s) would be indicated by 50 revolutions of that current meter in one minute ?

A. 0.42

B. 0.50

C. 0.60

D. 0.73

**Answer Option C**

9. A lysimeter is used to measure :

A. infiltration

B. evaporation

C. evapotranspiration

D. radiation

**Answer Option C**

10. In IS : 800 (1984) the permissible compressive stress in column is based on :

A. Euler formula

B. Secant formula

C. Rankine-Gordan formula

D. Rankine-Merchant formula

**Answer Option B**

11. Sewage treatment in an oxidation pond is accomplished primarily by :

A. alga-bacterial symbiosis

B. algal photosynthesis only

C. bacterial oxidation only

D. chemical oxidation only

**Answer Option A**

12. Presence of excess nitrates in river water indicates :

A. recent pollution of water with sewage

B. past pollution of water with sewage

C. immediate pollution of water with sewage

D. no pollution of water with sewage

**Answer Option B**

13. Two steel plates each of width 150 mm and thickness 10 mm are connected with three 20 mm diameter rivets placed in a zig-zag pattern. The pitch of the rivets is 75 mm and gauge is 60 mm. If the allowable tensile stress is 150 MPa, the maximum tensile force that the joint can withstand is

A. 195.66 kN

B. 195.00 kN

C. 192.75 kN

D. 225.00 kN

**Answer Option C**

14. The relation that must hold for the flow to be irrotational is

A.

B.

C.

D.

**Answer Option A**

15. A single bay single storey portal frame has hinged left support and a fixed right support. It is loaded with uniformly distributed load on the beam. Which one of the following statements is true with regard to the deformation of the frame ?

A. It would sway to the left side

B. It would sway to the right side

C. It would not sway at all

D. None of the above

**Answer Option A**

16. To have zero active pressure intensity at the tip of a wall in cohesive soil, one should apply a uniform surcharge intensity of

A. 2c tan α

B. 2c cot α

C. - 2c cot α

D. - 2c tan α

**Answer Option A**

17. The following characteristics pertain to the sand filters used in water industry. Filtration rate is 1 to 4 m3 (m2 day).Typical duration of operation in one run is 24 to 72 hours.Operating cost is low. Which of the above characteristics pertain to slow sand filters ?

A. I, II and III

B. I and II

C. II and III

D. I and III

**Answer Option D**

18. Effective length of a rafter member between two nodes at a distance L, perpendicular to the plane of the truss, is : .

A. 2.00 L

B. 0.85

C. 1.50

D. 1.00 L

**Answer Option B**

19. Consistency Index for a clayer soil is [LL = Liquid Limit, PL = Plastic Limit, PI = Plas-ticity Index, W - natural moisture content]

A.

B.

C. LL - PL

D. 0.5 w

**Answer Option A**

20. The slope of the elastic curve at the free end of a cantilever beam of span L, and with fluxural rigidity EI, subjected to uniformly distributed load of intensity w is

A. wL3/6EI

B. wL3/3EI

C. wL4/8EI

D. wL3/2EI

**Answer Option A**

21. If duty (D) is 1428 hectares/cumec and base period (B) is 120 days for an irrigated crop, then delta (Δ) in meters is given by

A. 102.8

B. 0.73

C. 1.38

D. 0.01

**Answer Option B**

22. The repeating variables in dimensional analysis should :

A. include the dependent variable

B. have amongst themselves all the basic dimensions

C. be derivable from one another

D. exclude one of the basic dimensions

**Answer Option A**

23. The minimum dissolved oxygen content (ppm) in a river necessary for the survival of aquatic life is

A. 0

B. 2

C. 4

D. 8

**Answer Option C**

24. Stopping sight distance is the minimum distance available on a highway which is the

A. distance of sufficient length to stop the vehicle wihtout collision.

B. distance visible to a driver during night driving.

C. height of the object above the road surface.

D. distance equal to the height of the driver's eye above the road surface.

**Answer Option A**

25. A body moving through still water at 6 m/sec produces a water velocity of 4 m/sec at a point 1 m ahead. The difference in pressure between the nose and the point 1 m ahead would be

A. 2, 000 N/m2

B. 10, 000 N/m2

C. 19, 620 N/m2

D. 98, 100 N/m2

**Answer Option B**

26. Critical factors for the activated sludge treatment process are

A. maximum hourly flow rate.

B. maximum and minimum flow rate.

C. maximum hourly flow rate and maximum daily organic load.

D. minimum hourly flow rate and minimum daily organic load.

**Answer Option C**

27. MPN index is a measure of one of the following :

A. Coliform bacteria

B. BOD5

C. Dissolved Oxygen Content

D. Hardness

**Answer Option A**

28. One of the probable causes of rutting on flexible pavements is

A. excessive stripping of binder material from the wearing course

B. use of flaky aggregates in the wearing course

C. inadequate compaction of pavement layers

D. high wind speeds

**Answer Option C**

29. The basic assumption of plane sections normal to the neutral axis before bending, remaining plane and normal to the neutral axis after bending, leads to :

A. uniform strain over the beam cross section

B. uniform stress over the cross section

C. linearly varying strain over the cross section

D. stresses which are proportional to strains at all cross sections

**Answer Option A**

30. Negative skin friction occurs when :

A. an upward drag exists in the pile

B. the surrounding soil settles more than the pile

C. the pile passes continuously through a firm soil

D. the driving operation begins

**Answer Option B**

31. The dimension of a pressure gradient in a fluid flow are :

A. ML-1T2

B. ML-3T-2

C. ML-2T-2

D. M-1L-1T-2

**Answer Option C**

32. Maximum strain at the level of compression steel for a rectangular section having effective cover to compression steel as d' and neutral axis depth from compression face as xu is

A. 0.0035 (1 - d'/xu)

B. 0.002 (1 - d'/xu)

C. 0.0035 (1 - xu/d')

D. 0.002 (1 - xu/d')

**Answer Option A**

33. The correct reinforcement-details at the corner of a rectangular water tank, in horizontal plane is shown by :

A.

B.

C.

D.

**Answer Option D**

34. The maximum shear stress in a solid shaft of circular cross-section having diameter d subjected to a torque T is τ. If the torque is increased by four times and the diameter of the shaft is increased by two times, the maximum shear stress in the shaft will be

A. 2τ

B. τ

C. τ/2

D. τ/4

**Answer Option C**

35. In a drained triaixal compression test, a saturated specimen of a cohesionless sand fails under a deviatoric stress of 3 kgf/cm2 when the cell pressure is 1 kgf/cm2 . The effective angle of shearing resistance of sand is about

A. 37°

B. 45°

C. 53°

D. 20°

**Answer Option A**

36. The particle size distribution curves are extremely useful for the classification of

A. fine grained soils

B. coarse grained soils

C. both coarse grained and fine grained soils

D. silts and clays

**Answer Option C**

37. If an element of a stressed body is in a state of pure shear with a magnitude of 80 N/mm2 , the magnitude of maximum principal stress at that location is

A. 80 N/mm2

B. 113.14 N/mm2

C. 120 N/mm2

D. 56.57 N/mm2

**Answer Option A**

38. Three reservoirs A, B and C are interconnected by pipes as shown in the below figure Water surface elevations in the reservoirs and the Piezometric Head at the junction J are indicated in the below figure. Discharges Q1, Q2 and Q3 are related as

A. Q1 + Q2 = Q3

B. Q1 = Q2 + Q3

C. Q2 = Q1 + Q3

D. Q1 + Q2 + Q3 = 0

**Answer Option B**

39. Both Reynolds and Froude numbers assume significance in one of following examples :

A. Motion of submarine at large depths

B. Motion of ship in deep seas

C. Cruising of a missile in air

D. Flow over spillways

**Answer Option D**

40. A direct shear test was conducted on a cohesionless soil (c = 0) specimen under a normal stress of 200 kN/m2. The specimen failed at a shear stress of 100 kN/m2. The angle of internal friction of the soil (degrees) is

A. 26.6

B. 29.5

C. 30.0

D. 32.6

**Answer Option A**

41. The following two statements are made with reference to a simply supported under-reinforced RCC beam : Failure takes place by crushing of concrete before the steel has yieled.The neutral axis moves up as the load is increased. With reference to the above statements, which of the following applies ?

A. Both the statements are false.

B. I is true but II is false.

C. Both the statements are true.

D. I is false but II is true.

**Answer Option C**

42. In deriving the equation for the hydraulic jump in a rectangular channel in terms of the conjugate depths and the initial Froude number.

A. continuity equation and energy equation are used

B. continuity equation and momentum equation are used

C. equations of continuity, mementum and energy are used

D. gradually varied flow equation is used

**Answer Option C**

43. An important purpose of prime coats is to:

A. promote the bond between the base and the wearing courses

B. promote the adhesion between an existing wearing surface and a subsequent wearing surface

C. promote the bond between the sub-base cause and the sub-grade

D. increase the stability of the sub-grade

**Answer Option B**

44. A trickling filter is primarily a :

A. straining process to remove suspended solids from sewage

B. biological oxidation process to remove BOD from sewage

C. straining process to remove turbidity from water

D. straining process to remove bacteria from water

**Answer Option B**

45. A soil having particles of nearly the same size is known as

A. well graded

B. uniformly graded

C. poorly graded

D. gap graded

**Answer Option B**

46. The ideal form of curve for the summit curve is :

A. spiral

B. parabola

C. circle

D. lemniscate

**Answer Option B**

47. A septic tank is

A. an aerobic method of on site sewage treatment

B. an anaerobic method of on site treatment

C. a physical method of water treatment

D. a physicochemical method of water treatment

**Answer Option B**

48. At highway stretches where the required overtaking sight distance cannot be provided, it is necessary to incorporate :

A. at least twice the stopping sight distance

B. half the required overtaking sight distance

C. one-third the required overtaking sight distance

D. three times the stopping sight distance

**Answer Option A**

49. The members EJ and IJ of steel truss shown in the figure below are subjected to a temperature rise of 30° C. The coefficient of thermal expansion of steel is 0.000012 per °C per unit length. The displacement (mm) of joint E relative to joint H along the direction HE of the truss, is

A. 0.255

B. 0.589

C. 0.764

D. 1.026

**Answer Option C**

50. A-2-hour unit hydrograph can be approximated as trapezoidal as shown in the below figure. The unit hydrograph refers to catchment of area

A. 138.24 km2

B. 0.0384 km2

C. 384 m2

D. 3840 m2

**Answer Option C**

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