### Civil Engineering - GATE Exam Questions MCQs Part 7

1. The unit for coefficient of subgrade modulus is

A.
kN/m3
B.
kN/m2
C.
kN/m
D.
kN.m

2. Plate bearing test with 20 cm diameter plate on soil subgrade yielded a pressure of 1.25 x 105 N/m2 at 0.5 cm deflection. What is the elastic modulus of subgrade ?

A.
56.18 x 105 N/m2
B.
22.10 x 105 N/m2
C.
44.25 x 105 N/m2
D.
50.19 x 105 N/m2
E.
None.

3. Use of coagulants such as alum

A.
results in reduction of pH of the treated water.
B.
results in increase of pH of the treated water.
C.
results in no chnage in pH of the treated water.
D.
may cause an increase in decrease of decrease of pH of the treated water.

4. The maximum permissible deflection for a gantry girder, spanning over 6 m, on which an EOT (electric overhead travelling) crane of capacity 200 kN is operating, is

A.
8 mm
B.
10 mm
C.
12 mm
D.
18 mm

5. A hyetograph is a graph representing

A.
rainfall volume with time
B.
rainfall intensity with time
C.
rainfall intensity with duration
D.
rainfall intensity over an area

6. If, for a fluid in motion, pressure at a point is same in all directions, then the fluid is :

A. a real fluid
B. a Newtonian fluid
C. an ideal fluid
D. a non-Newtonian fluid

7. It is proposed to widen and strengthen an existing 2-lane NH section as a divided highway. The existing traffic in one direction is 2500 commercial vehicles (CV) per day. The construction will take 1 year. The design CBR of soil subgrade is found to be 5 percent, Given: traffic growth rate for CV = 8 percent, vehicle damage factor = 3.5 (standard axles per CV), design life = 10 years and traffic distribution factor = 0.75. The cumulative standard axles (msa) computed are

A. 35
B. 37
C. 65
D. 70

8. If the shear force at a section of beam under bending is equal to zero then the bending moment at the section is

A. zero
B. maximum
C. minimum
D. minimum or maximum

9. In network of pipes

A. the algebraic sum of discharges around each circuit is zero
B. the algebraic sum of (pressure + datum) head drops around each circuit is zero
C. the elevation of hydraulic grade line is assumed for each junction point
D. elementary circuits are replaced by equivalent pipes

10. A volume of 3.0 x 106 m3 of ground water was pumped out from an unconfined aquifer, uniformly from an area of 5 km2. The pumping lowered the water table from initial level of 102 m to 99 m. The specific yield of the aquifier is

A. 0.20
B. 0.30
C. 0.40
D. 0.50

11. The stress-strain behaviour of soils as shown in the following figure corresponds to :

A. Curve 1 : Loose sand and normally consolidated clay Curve 2 : Loose sand and over consolidated clay
B. Curve 1 : Dense sand and normally consolidated clay Curve 2 : Loose sand and over consolidated clay
C. Curve 1: Dense sand and over consolidated clay Curve 2: Loose sand and normally consolidated clay
D. Curve 1: Loose sand and over consolidated clay Curve 2: Dense sand and normally consolidated clay

12. The maximum allowable compressive stress corresponding to lateral buckling in a discretely laterally supported symmetrical I beam does not depend upon :

A. the modulus of elasticity
C. the span length of the beam
D. the ratio of overall depth of thickness of the flange

13. The soils most susceptible to liquefaction are :

A. saturated dense sands
B. saturated fine and medium sands of uniform particle size
C. saturated clays of uniform size
D. saturated gravels and cobbles

14. The following general statement may be made about the penetration value and softening point of bitumen

A. higher the penetration value, higher is the softening point
B. higher the penetration value, lower is the softening point
C. for very high and very low penetration value the softening point is very low
D. absolutely no correlation can be drawn between penetration value and softening point of bitumen

15. Sand drains are used to :

A. reduce the settlement
B. accelerate the consolidation
C. increase the permeability

16. For a 'best' symmetrical trapezoidal section of an open channel with a given area of section and side slopes, one of the following statements holds true :

A. Half the top width is equal to one of the side slopes
B. Half the top width plus the bottom width is equal to both the side slopes put together
C. Water depth is equal to half bottom width
D. Hydraulic mean depth is equal to half the top width

17. Temporary hardness in water is caused by the presence of

A. Bicarbonates of Ca and Mg
B. Sulphates of Ca and Mg
C. Chlorides of Ca and Mg
D. Nitrates of Ca and Mg.

18. Bituminous materials are commonly use in highway construction because of their good

A. tensile and compression properties.
B. binding and water proofing properties.
C. shear strength and tensile properties.
D. bond and tensile properties.

19. The stepped cantilever is subjected to moments, M as shown in the figure below. The vertical deflection at the free end (neglecting the self weight) is

A.
B.
C.
D. Zero

20. A road is provided with a horizontal circular curve having deflection angle of 55° and centre line radius of 250 m. A transition curve is to be provided at each end of the circular curve of such a length that the rate of gain of radial acceleration is 0.3 m/s3 at a speed of 50 km per hour. Length of the transition curve required at each of the ends is

A. 2.57 m
B. 33.33 m
C. 35.73 m
D. 1666.67 m

21. A test plate 30 cm x 30 cm resting on a sand deposit settles by 10 mm under a certain loading intensity. A footing 150 cm x 200 cm resting on the same sand deposit and loaded to the same load intensity settles by

A. 2.0 mm
B. 27.8 mm
C. 3.02 mm
D. 50.0 mm

22. Cavitation is caused by

A. high velocity
B. low pressure
C. high pressure
D. high temperature

23. Flow at critical depth takes place in an open channel When

A. for a given specific energy, discharge is maximum
B. for a given discharge, specific energy is maximum
C. discharge is minimum for a given specific energy
D. discharge is maximum for a given specific force

24. Two completely penetrating wells are located L (in metres) apart, in homogeneous confined aquifer. The drawdown measured at the mid point between the two wells (at a distance of 0.5 L from both the wells) is 2.0 m when only the first well is being pumped at the steady rate of Q1 m3/sec. When both the wells are being pumped at identical steady rate of Q2 m3/sec, the drawdown measured at the same location is 8, 0 m. It may be assumed that the drawdown at the wells always remains at 10.0 m when being pumped and the radius of influence is larger than 0.5 L Q1/Q2 is equal to

A. 8/5
B. 4/3
C. 5/8
D. ln (L/2)

25. A footing 2 m x 1 m exerts a uniform pressure of 150 kN/m2 on the soil. Assuming a load dispersion of 2 vertical to 1 horizontal the average vertical stress (kN/m2) at 1.0 m below the footing is

A. 50
B. 75
C. 80
D. 100

26. The influence line diagram for the force in member 'a' of the truss shown below is given by

A.
B.
C.
D.

27. In a BOD test using 5% dilution of the sample (15 ML of sample and 285 mL of dilution water), dissolved oxygen values for the sample and dilution water blank bottles after five days incubation at 20°C were 3.80 and 8.80 mg/L. respectively. Dissolved oxygen originally present in the undiluted sample was 0.80 mg/L. The 5-day 20°C BOD of the sample is

A. 116 mg/L
B. 108 mg/L
C. 100 mg/L
D. 92 Mg/L

28. Group symbols assigned to silty sand and clayey sand are respectively

A. SS and CS
B. SM and CS
C. SM and SC
D. MS and CS

29. The shape factor of the section shown in the below figure is

A. 1.5
B. 1.12
C. 2
D. 1.7

6. If, for a fluid in motion, pressure at a point is same in all directions, then the fluid is :

A. a real fluid
B. a Newtonian fluid
C. an ideal fluid
D. a non-Newtonian fluid

7. It is proposed to widen and strengthen an existing 2-lane NH section as a divided highway. The existing traffic in one direction is 2500 commercial vehicles (CV) per day. The construction will take 1 year. The design CBR of soil subgrade is found to be 5 percent, Given: traffic growth rate for CV = 8 percent, vehicle damage factor = 3.5 (standard axles per CV), design life = 10 years and traffic distribution factor = 0.75. The cumulative standard axles (msa) computed are

A. 35
B. 37
C. 65
D. 70

8. If the shear force at a section of beam under bending is equal to zero then the bending moment at the section is

A. zero
B. maximum
C. minimum
D. minimum or maximum

9. In network of pipes

A. the algebraic sum of discharges around each circuit is zero
B. the algebraic sum of (pressure + datum) head drops around each circuit is zero
C. the elevation of hydraulic grade line is assumed for each junction point
D. elementary circuits are replaced by equivalent pipes

10. A volume of 3.0 x 106 m3 of ground water was pumped out from an unconfined aquifer, uniformly from an area of 5 km2. The pumping lowered the water table from initial level of 102 m to 99 m. The specific yield of the aquifier is

A. 0.20
B. 0.30
C. 0.40
D. 0.50