### Civil Engineering - GATE Exam Questions MCQs Part 4

1. At the same mean velocity, the ratio of head loss per unit length for a sewer pipe flowing full to that for the same pipe flowing half full would be :

A.

2.0

2.0

B.

1.63

1.63

C.

1.00

1.00

D.

0.61

0.61

**Answer Option B**

2. As per IS : 800-1984 the minimum pitch of rivets in a row is recommended as the diameter of the rivet times

A.

2.0

2.0

B.

2.5

2.5

C.

3.0

3.0

D.

4.0

4.0

**Answer Option B**

3. The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchment at any time t, is

A.

The slope of the 1-hour unit hydrograph at that time

The slope of the 1-hour unit hydrograph at that time

B.

The slope of the direct runoff unit hydrograph at that time

The slope of the direct runoff unit hydrograph at that time

C.

Difference in the slope of the S-curve and 1-hour unit hydrograph

Difference in the slope of the S-curve and 1-hour unit hydrograph

D.

The slope of the S-curve with effective rainfall intensity of 1 cm/hr

The slope of the S-curve with effective rainfall intensity of 1 cm/hr

**Answer Option D**

4. Water emerges from an ogee spillway with velocity 13.72 m/s and depth = 3.0 m at its toe. The tail water depth required to form a hydraulic jump at the toe is

A.

6.48 m

6.48 m

B.

5.24 m

5.24 m

C.

3.24 m

3.24 m

D.

2.24 m

2.24 m

**Answer Option C**

5. In a BOD test, 5 ml of waste is added to 295 ml of aerated pure water. Initial dissolved oxygen (D.O) content of the diluted sample is 7.8 mg/l. After 5 days of incubation at 20°C, the D.O. content of the sample is reduced to 4.4 mg/l. The BOD of the waste water is :

A.

196 mg/l

196 mg/l

B.

200 m/l

200 m/l

C.

204 mg/l

204 mg/l

D.

208 mg/l

208 mg/l

**Answer Option B**

6. The lateral ties in a reinforced concrete rectangular column uncle: axial compression are used to :

A. avoid the buckling of the longitudinal steel under compression

B. provide adequate shear capacity

C. provide adequate confinement to concrete

D. reduce the axial deformation of the column

**Answer Option A**

7. The specific gravity of paving bitumen as per IS:73-1992 lies between

A. 1.10 and 1.06

B. 1.06 and 1.02

C. 1.02 and 0.97

D. 0.97 and 0.92

**Answer Option C**

8. A linear relationship is observed between speed and density on a certain section of a highway. The free flow speed is observed to be 80 km per hour and the jam density is estimated as 100 vehicles per km length. Based on the above relationship, the maximum flow expected on this section and the speed at the maximum flow will respectively be

A. 8000 vehicles per hour and 80 km per hour

B. 8000 vehicles per hour and 25 km per hour

C. 2000 vehicles per hour and 80 km per hour

D. 2000 vehicles per hour and 40 km per hour

**Answer Option D**

9. The ratio of unconfined compressive strength of an undisturbed sample of soil to that of a remoulded sample, at the same water content, is known as :

A. activity

B. damping

C. plasticity

D. sensitivity

**Answer Option D**

10. The modulus of rupture of concrete gives

A. the direct tensile strength of the concrete

B. the direct compressive strength of the concrete

C. the tensile strength of the concrete under bending

D. the characteristic strength of the concrete

**Answer Option C**

11. The total length (in km) of the existing National Highways in India is in the range of

A. 15, 000 to 25, 000

B. 25, 000 to 35, 000

C. 35, 000 to 45, 000

D. 45, 000 to 55, 000

**Answer Option B**

12. A direct runoff hydrograph due to an isolated storm with an effective rainfall of 2 cm was trapezoidal in shape as shown in the below figure. The hydrograph corresponds to a catchment area (in sq. km) of

A. 790.2

B. 599.4

C. 689.5

D. 435.3

**Answer Option B**

13. A simply supported beam with an overhang is traversed by a unit concentrated moment from the left to the right as shown below The influence line for reaction at B is given by

A.

B.

C.

D. zero everywhere.

**Answer Option A**

14. The parameters in Horton's infiltration equation are given as, fo = 7.62 cm/hour, fc = 1.34 cm/hour and k = 4.182/hour. For assumed continuous ponding the cumulative infiltration at the end of 2 hours is

A. 2.68 cm

B. 1.50 cm

C. 1.34 cm

D. 4.18 cm

**Answer Option C**

15. The temporary hardness of water, is caused by:

A. dissolved carbondioxide

B. bicarbonates and carbonates of calcium and magnesium

C. bicarbonates of sodium and potassium

D. carbonates of calucium and magnesium

**Answer Option B**

16. Rotational stiffness-coefficient, K11 for the frame having two members of equal EI/l is given by :

A. 5 EI/l

B. 6 EI/l

C. 7 EI/l

D. 8 EI/l

**Answer Option C**

17. The plan of a survey plotted to a scale of 10 m to 1 cm is reduced in such a way that a line originally 10 cm long now measures 9 cm. The area of the reduced plan is measured as 81 cm2. The actual (m2) of the survey is

A. 10000

B. 6561

C. 1000

D. 656

**Answer Option A**

18. Width of carriage way for a single lane is recommended to be

A. 7.5 m

B. 7.0 m

C. 3.75 m

D. 5.5 m

**Answer Option C**

19. The shape of the cross-section, which has the largest shape factor, is

A. rectangular

B. I-section

C. diamond

D. solid circular

**Answer Option C**

20. The unit of dynamic viscosity of a fluid is

A. m2/s

B. Ns/m2

C. Pa s/m2

D. kg s2/m2

**Answer Option B**

21. A point load of 700 kN is applied on the surface of thick layer of clay. Using Boussinesq's elastic analysis, the estimated vertical stress (σv) at a depth of 2 m and a radial distance of 1.0 m from the point of application of the load, is :

A. 47.5 kPa

B. 47.6 kPa

C. 47.7 kPa

D. 47.8 kPa

**Answer Option D**

22. The liquid limit (LL), plastic limit (PL) and shrinkage limit (SL) of a cohesive soil satisfy the relation

A. LL > PL < SL

B. LL > PL > SL

C. LL < PL < SL

D. LL < PL > SL

**Answer Option B**

23. A propped cantilever beam of span L, is loaded with uniformly distributed load of intensity w/unit length, all through the span. Bending moment at the fixed end is,

A.

B.

C.

D.

**Answer Option A**

24. The sequent depth ratio of a hydraulic jump in a rectangular horizontal channel is 10.30. The Froude Number at the beginning of the jump is :

A. 5.64

B. 7.63

C. 8.05

D. 13.61

**Answer Option B**

25. Shear centre for an angle-purlin as shown in the below figure is located at,

A. X

B. Y

C. Z

D. none

**Answer Option A**

26. If φ = nominal diameter of reinforcing bar, fs = compressive stress in the bar and fbd= design bond stress of concrete, the anchorage length, La of straight bar in compression is equal to :

A.

B.

C.

D.

**Answer Option D**

27. Alligator or map cracking is the common type of failure in

A. concrete pavements

B. bituminous surfacing

C. gravel roads

D. WBM construction

**Answer Option B**

28. A steel beam supporting loads from the floor slab as well as from wall is termed as

A. Stringer beam

B. Lintel beam

C. Spandrel beam

D. Header beam

**Answer Option A**

29. For an anisotropic soil, permeabilities in x and y directions are kx and ky respectively in a two dimensional flow. The effective permeability keq for the soil is given by

A. kx + ky

B. kx/ky

C. (kx2 + ky2)1/2

D. (kxky)1/2

**Answer Option D**

30. Chemical oxygen Demand (COD) of a sample is always greater than Biochemical Oxygen Demand (BOD) since it represents :

A. biodegradable organic matter only

B. biodegradable and non-biodegradable organic matter

C. non-biodegradable organic matter

D. inorganic matter

**Answer Option B**

31. For the determination of earth pressure, Coulomb's wedge theory assumes that:

A. the back of wall is smooth and vertical

B. the soil is non-homogeneous and anisotropic

C. the slip surface is circular

D. the wall surface is rough

**Answer Option D**

32. The degree of kinematic indeterminacy of the rigid frame with clamped ends at A and D shown in the below figure is,

A. 4

B. 3

C. 2

D. zero

**Answer Option B**

33. The dimensions for the flexural rigidity of a beam element in mass (M), length (L) and time (T) is given by

A. MT-2

B. ML3T-2

C. ML-1T-2

D. M-1T2

**Answer Option D**

34. The centre of pressure of a liquid on a plane surface immersed vertically in a static body of liquid, always lies below the centroid of the surface area, because

A. in liquids the pressure acting is same in-all directions

B. there is no shear stress in liquids at rest

C. the liquid pressure is constant over depth

D. the liquid pressure increases linearly with depth

**Answer Option D**

35. The most commonly used sampler for obtaining a disturbed sample of the soil is

A. split spoon sampler

B. open drive sampler

C. piston sampler

D. thin wall shelby tube sampler

**Answer Option A**

36. The two criteria for the determination of allowable bearing capacity of a foundation are

A. tensile failure and compression failure.

B. tensile failure and settlement.

C. bond failure and shear failure.

D. shear failure and settlement.

**Answer Option D**

37. The time for a clay layer to achieve 90% consolidation is 15 years. The time required to achieve 90% consolidation; if the layer were twice as thick, 3 times forr permeable and 4 times more compressible would be :

A. 70 years

B. 75 years

C. 80 years

D. 85 years

**Answer Option C**

38. If soil is dried beyond its shrinkage limit, it will show :

A. Large volume change

B. Moderate volume change

C. Low volume change

D. No volume change

**Answer Option D**

39. If YY is the centroidal axis of a T beam-section subjected to plastic moment, Mp, the neutral axis lies,

A. above the line ZZ

B. between the lines YY and ZZ

C. between the lines XX and YY

D. below the line XX

**Answer Option B**

40. The expression for the specific speed of a pump :

A. does not include the diameter of the impeller

B. yields larger values for radial pumps than for axial flow pump

C. is necessarily non dimensional

D. includes power as one of the variables

**Answer Option C**

41. A parabolic curve is used to connect a 4% upgrade with a 2% downgrade as shown in the below figure. The highest point on the summit is at a distance of (measured horizontally from the first tangent point - (FTP)

A. 50 m

B. 60 m

C. 75 m

D. 100 m

**Answer Option C**

42. A deep cut of 7 m has to be made in a clay with unit weight 16 kN/m3 and a cohesion of 25 kN/m2. What will be the factor of safety if one has to have a slope angle of 30° ? Stability number is given to be 0.178 (from Taylor's chart) for a depth factor of 3.

A. 0.80

B. 1.1

C. 1.25

D. 1.0

**Answer Option C**

43. An inverted siphon is a

A. device for distributing septic tank effluent to a soil absorption system

B. device for preventing overflow from elevated water storage tank

C. device for preventing crown corrosion of sewer

D. section of sewer which is dropped below the hydraulic grade line in order to avoid an obstacle.

**Answer Option D**

44. The main constituents of gas generated during the anaerobic digestion of sewage sludge are :

A. carbon dioxide and methane

B. methane and ethane

C. carbon dioxide and carbon monoxide

D. carbon monoxide and nitrogen

**Answer Option A**

45. Two samples of water A and B have pH values of 4.4 and 6.4 respectively. How many times more acidic sample A is than sample B ?

A. 0

B. 50

C. 100

D. 200

**Answer Option C**

46. A weir on a permeable foundation with downstream sheet pile is shown in the figure below. The exit gradient as per Khosla's method is

A. 1 in 6.0

B. 1 in 5.0

C. 1 in 3.4

D. 1 in 2.5

**Answer Option C**

47. Which one of the following set of values give the minimum clear cover (in mm) for the main reinforcements in the slab, beam, column and footing, respectively, according to IS : 456-1978 ?

A. 20, 25, 30, 75

B. 5, 15, 25, 50

C. 15, 25, 40, 75

D. none of the above

**Answer Option C**

48. Two flow patterns are represented by their stream functions ψ1 and ψ2 as given below:ψ1 = x2 + y2, ψ2 = 2xy If these two patterns are superimposed on one another, the resulting streamline pattern can be represented by one of the following :

A. A family of parallel straight lines

B. A family of circles

C. A family of parabolas

D. A family of hyperbolas

**Answer Option B**

49. The forces in members 'a, b, c' in the truss shown are, respectively

A. P, , 0

B. , P, 0

C. P, P, P

D. , , 0

**Answer Option A**

50. The plan of stairs supported at each end by landings spanning parallel with risers is shown in the below figure. The effective span of staircase slab is

A. 3000 mm

B. 4600 mm

C. 4750 mm

D. 6400 mm

**Answer Option B**

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