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GATE 2021 : Civil Engineering CE01 (with Final Answer Keys)

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Civil Engineering (CE, Set-1) General Aptitude (GA) Q.1 Q.5 Multiple Choice Question (MCQ), carry ONE mark each (for each wrong answer: 1/3). Q.1 Getting to the top is ________________ than staying on top. (A) more easy (B) much easy (C) easiest (D) easier CE, Set-1 Copyright GATE 2021 Page 1 of 36 Civil Engineering (CE, Set-1) Q.2 The mirror image of the above text about the x-axis is (A) (B) (C) (D) Q.3 In a company, 35% of the employees drink coffee, 40% of the employees drink tea and 10% of the employees drink both tea and coffee. What % of employees drink neither tea nor coffee? (A) 15 (B) 25 (C) 35 (D) 40 CE, Set-1 Copyright GATE 2021 Page 2 of 36 Civil Engineering (CE, Set-1) Q.4 and are two operators on numbers p and q such that p q = If p2 + q2 and pq = , then x = = ; (A) y 2 (B) y (C) 3y 2 (D) 2y Q.5 Four persons P, Q, R and S are to be seated in a row, all facing the same direction, but not necessarily in the same order. P and R cannot sit adjacent to each other. S should be seated to the right of Q. The number of distinct seating arrangements possible is: (A) 2 (B) 4 (C) 6 (D) 8 CE, Set-1 Copyright GATE 2021 Page 3 of 36 Civil Engineering (CE, Set-1) Q. 6 Q. 10 Multiple Choice Question (MCQ), carry TWO marks each (for each wrong answer: 2/3). Q.6 Statement: Either P marries Q or X marries Y Among the options below, the logical NEGATION of the above statement is: (A) P does not marry Q and X marries Y. (B) Neither P marries Q nor X marries Y. (C) X does not marry Y and P marries Q. (D) P marries Q and X marries Y. Q.7 Consider two rectangular sheets, Sheet M and Sheet N of dimensions 6 cm x 4 cm each. Folding operation 1: The sheet is folded into half by joining the short edges of the current shape. Folding operation 2: The sheet is folded into half by joining the long edges of the current shape. Folding operation 1 is carried out on Sheet M three times. Folding operation 2 is carried out on Sheet N three times. The ratio of perimeters of the final folded shape of Sheet N to the final folded shape of Sheet M is ______. (A) 13 : 7 (B) 3:2 (C) 7:5 (D) 5 : 13 CE, Set-1 Copyright GATE 2021 Page 4 of 36 Civil Engineering (CE, Set-1) P Q.8 T Q R S Five line segments of equal lengths, PR, PS, QS, QT and RT are used to form a star as shown in the figure above. The value of , in degrees, is ______ (A) 36 (B) 45 (C) 72 (D) 108 Q.9 A function, , is defined by ( p q )2 , if p q, ( p,q ) = if p q. p + q, The value of the expression (A) (B) ( ( 3 + 2 ) ,( 2 + 3) ) ( ( 2 + 1) ) is: (C) 6 (D) 6 CE, Set-1 Copyright GATE 2021 Page 5 of 36 Civil Engineering (CE, Set-1) Q.10 Humans have the ability to construct worlds entirely in their minds, which don t exist in the physical world. So far as we know, no other species possesses this ability. This skill is so important that we have different words to refer to its different flavors, such as imagination, invention and innovation. Based on the above passage, which one of the following is TRUE? (A) No species possess the ability to construct worlds in their minds. (B) The terms imagination, invention and innovation refer to unrelated skills. (C) We do not know of any species other than humans who possess the ability to construct mental worlds. (D) Imagination, invention and innovation are unrelated to the ability to construct mental worlds. CE, Set-1 Copyright GATE 2021 Page 6 of 36 Civil Engineering (CE, Set-1) Civil Engineering (CE, Set-1) Q.1 Q.16 Multiple Choice Question (MCQ), carry ONE mark each (for each wrong answer: 1/3). Q.1 The rank of matrix [ (A) 1 (B) 2 (C) 3 (D) 4 Q.2 If (A) [ (B) (C) [ =[ ] ] and ] is =[ ] then is ] ] (D) [ Q.3 The shape of the cumulative distribution function of Gaussian distribution is (A) Horizontal line (B) Straight line at 45 degree angle (C) Bell-shaped (D) S-shaped [ ] CE, Set-1 Copyright GATE 2021 Page 7 of 36 Civil Engineering (CE, Set-1) Q.4 A propped cantilever beam EF is subjected to a unit moving load as shown in the figure (not to scale). The sign convention for positive shear force at the left and right sides of any section is also shown. Unit moving load E F G Sign convention for positive shear force The CORRECT qualitative nature of the influence line diagram for shear force at G is (A) + E _ G F (B) + E _ (C) F G + E _ G E + G F (D) _ CE, Set-1 Copyright GATE 2021 F Page 8 of 36 Civil Engineering (CE, Set-1) Q.5 Gypsum is typically added in cement to (A) prevent quick setting (B) enhance hardening (C) increase workability (D) decrease heat of hydration Q.6 The direct and indirect costs estimated by a contractor for bidding a project is 160000 and 20000 respectively. If the mark up applied is 10% of the bid price, the quoted price (in ) of the contractor is (A) 200000 (B) 198000 (C) 196000 (D) 182000 Q.7 In an Oedometer apparatus, a specimen of fully saturated clay has been consolidated under a vertical pressure of 50 kN/m2 and is presently at equilibrium. The effective stress and pore water pressure immediately on increasing the vertical stress to 150 kN/m2, respectively are (A) 150 kN/m2 and 0 (B) 100 kN/m2 and 50 kN/m2 (C) 50 kN/m2 and 100 kN/m2 (D) 0 and 150 kN/m2 CE, Set-1 Copyright GATE 2021 Page 9 of 36 Civil Engineering (CE, Set-1) Q.8 A partially-saturated soil sample has natural moisture content of 25% and bulk unit weight of 18.5 kN/m3. The specific gravity of soil solids is 2.65 and unit weight of water is 9.81 kN/m3. The unit weight of the soil sample on full saturation is (A) 21.12 kN/m3 (B) 19.03 kN/m3 (C) 20.12 kN/m3 (D) 18.50 kN/m3 Q.9 If water is flowing at the same depth in most hydraulically efficient triangular and rectangular channel sections then the ratio of hydraulic radius of triangular section to that of rectangular section is (A) (B) (C) 1 (D) 2 Q.10 Kinematic viscosity is dimensionally represented as (A) M LT (B) M L2T (C) T2 L (D) L2 T CE, Set-1 Copyright GATE 2021 Page 10 of 36 Civil Engineering (CE, Set-1) Q.11 Which one of the following statements is correct? (A) Pyrolysis is an endothermic process, which takes place in the absence of oxygen. (B) Pyrolysis is an exothermic process, which takes place in the absence of oxygen. (C) Combustion is an endothermic process, which takes place in the abundance of oxygen. (D) Combustion is an exothermic process, which takes place in the absence of oxygen. Q.12 Which one of the following is correct? (A) The partially treated effluent from a food processing industry, containing high concentration of biodegradable organics, is being discharged into a flowing river at a point P. If the rate of degradation of the organics is higher than the rate of aeration, then dissolved oxygen of the river water will be lowest at point P. (B) The most important type of species involved in the degradation of organic matter in the case of activated sludge process based wastewater treatment is chemoheterotrophs. (C) For an effluent sample of a sewage treatment plant, the ratio BOD5-day,20oC upon ultimate BOD is more than 1. (D) A young lake characterized by low nutrient content and low plant productivity is called eutrophic lake. Q.13 The liquid forms of particulate air pollutants are (A) dust and mist (B) mist and spray (C) smoke and spray (D) fly ash and fumes CE, Set-1 Copyright GATE 2021 Page 11 of 36 Civil Engineering (CE, Set-1) Q.14 The shape of the most commonly designed highway vertical curve is (A) circular (single radius) (B) circular (multiple radii) (C) parabolic (D) spiral Q.15 A highway designed for 80 km/h speed has a horizontal curve section with radius 250 m. If the design lateral friction is assumed to develop fully, the required super elevation is (A) 0.02 (B) 0.05 (C) 0.07 (D) 0.09 Q.16 Which of the following is NOT a correct statement? (A) The first reading from a level station is a Fore Sight . (B) Basic principle of surveying is to work from whole to parts. (C) Contours of different elevations may intersect each other in case of an overhanging cliff. (D) Planimeter is used for measuring area . CE, Set-1 Copyright GATE 2021 Page 12 of 36 Civil Engineering (CE, Set-1) Q.17 Multiple Select Question (MSQ), carry ONE mark (no negative marks). Q.17 Which of the following is/are correct statement(s)? (A) Back Bearing of a line is equal to Fore Bearing 180o. (B) If the whole circle bearing of a line is 270o, its reduced bearing is 90o NW. (C) The boundary of water of a calm water pond will represent contour line. (D) In the case of fixed hair stadia tachometry, the staff intercept will be larger, when the staff is held nearer to the observation point. CE, Set-1 Copyright GATE 2021 Page 13 of 36 Civil Engineering (CE, Set-1) Q.18 Q.25 Numerical Answer Type (NAT), carry ONE mark each (no negative marks). Q.18 Consider the limit: ( ) The limit (correct up to one decimal place) is _____________ Q.19 for V = [2, 3] [1, 2] [0,1] The volume determined from will be (in integer) __________ Q.20 The state of stress in a deformable body is shown in the figure. Consider transformation of the stress from the x-y coordinate system to the X-Y coordinate system. The angle , locating the X-axis, is assumed to be positive when measured from the x-axis in counter-clockwise direction. y X XX = 120 MPa Y xx = 40 MPa XY = 50 MPa xy 30 x xy yy = 35.6 MPa The absolute magnitude of the shear stress component xy (in MPa, round off to one decimal place) in x-y coordinate system is _____________________ CE, Set-1 Copyright GATE 2021 Page 14 of 36 Civil Engineering (CE, Set-1) Q.21 The equation of deformation is derived to be y = x 2 xL for a beam shown in the figure. y x L The curvature of the beam at the mid-span (in units, in integer) will be _______ Q.22 A truss EFGH is shown in the figure, in which all the members have the same axial rigidity R. In the figure, P is the magnitude of external horizontal forces acting at joints F and G. P G F P L H E L If R = 500 103 kN, P = 150 kN and L = 3 m, the magnitude of the horizontal displacement of joint G (in mm, round off to one decimal place) is _______________ Q.23 The cohesion (c), angle of internal friction ( ) and unit weight ( ) of a soil are 15 kPa, 20 and 17.5 kN/m3, respectively. The maximum depth of unsupported excavation in the soil (in m, round off to two decimal places) is ______________ CE, Set-1 Copyright GATE 2021 Page 15 of 36 Civil Engineering (CE, Set-1) Q.24 Two reservoirs are connected through a homogeneous and isotropic aquifer having hydraulic conductivity (K) of 25 m/day and effective porosity ( ) of 0.3 as shown in the figure (not to scale). Ground water is flowing in the aquifer at the steady state. Reservoir 1 Aquiclude 30 m Reservoir 2 10 5m Aquifer Aquifuge K = 25 m/day = 0.3 10 m 2 km Datum If water in Reservoir 1 is contaminated then the time (in days, round off to one decimal place) taken by the contaminated water to reach to Reservoir 2 will be __________ Q.25 A signalized intersection operates in two phases. The lost time is 3 seconds per phase. The maximum ratios of approach flow to saturation flow for the two phases are 0.37 and 0.40. The optimum cycle length using the Webster s method (in seconds, round off to one decimal place) is _________ CE, Set-1 Copyright GATE 2021 Page 16 of 36 Civil Engineering (CE, Set-1) Q.26 Q.35 Multiple Choice Question (MCQ), carry TWO mark each (for each wrong answer: 2/3). Q.26 d2y dy The solution of the second-order differential equation + 2 + y = 0 with 2 dx dx boundary conditions y ( 0) = 1 and y (1) = 3 is (A) e x + ( 3e 1) xe x (B) e x ( 3e 1) xe x (C) x x e x + 3e sin 1 xe 2 (D) x x e x 3e sin 1 xe 2 Q.27 The value of is (A) 1.718 (B) 1.727 (C) 2.192 (D) 2.718 CE, Set-1 Copyright GATE 2021 using the trapezoidal rule with four equal subintervals Page 17 of 36 Civil Engineering (CE, Set-1) Q.28 A 50 mL sample of industrial wastewater is taken into a silica crucible. The empty weight of the crucible is 54.352 g. The crucible with the sample is dried in a hot air oven at 104 C till a constant weight of 55.129 g. Thereafter, the crucible with the dried sample is fired at 600 C for 1 h in a muffle furnace, and the weight of the crucible along with residue is determined as 54.783 g. The concentration of total volatile solids is ______________ . (A) 15540 mg/L (B) 8620 mg/L (C) 6920 mg/L (D) 1700 mg/L CE, Set-1 Copyright GATE 2021 Page 18 of 36 Civil Engineering (CE, Set-1) Q.29 A wedge M and a block N are subjected to forces P and Q as shown in the figure. If force P is sufficiently large, then the block N can be raised. The weights of the wedge and the block are negligible compared to the forces P and Q. The coefficient of friction ( ) along the inclined surface between the wedge and the block is 0.2. All other surfaces are frictionless. The wedge angle is 30 . Q Surface 2 = 0.2 Surface 3 Block N P 30 Wedge M Surface 1 The limiting force P, in terms of Q, required for impending motion of block N to just move it in the upward direction is given as P = Q . The value of the coefficient (round off to one decimal place) is (A) 0.6 (B) 0.5 (C) 2.0 (D) 0.9 CE, Set-1 Copyright GATE 2021 Page 19 of 36 Civil Engineering (CE, Set-1) Q.30 Contractor X is developing his bidding strategy against Contractor Y. The ratio of Y s bid price to X s cost for the 30 previous bids in which Contractor X has competed against Contractor Y is given in the Table Ratio of Y s bid price to X s cost Number of bids 1.02 6 1.04 12 1.06 3 1.10 6 1.12 3 Based on the bidding behaviour of the Contractor Y, the probability of winning against Contractor Y at a mark up of 8% for the next project is (A) 0% (B) more than 0% but less than 50% (C) more than 50% but less than 100% (D) 100% CE, Set-1 Copyright GATE 2021 Page 20 of 36 Civil Engineering (CE, Set-1) Q.31 Based on drained triaxial shear tests on sands and clays, the representative variations of volumetric strain ( V/V) with the shear strain ( ) is shown in the figure. Volumetric strain ( V/V) Expansion Compression Curve P Shear strain ( ) Curve Q Choose the CORRECT option regarding the representative behaviour exhibited by Curve P and Curve Q. (A) Curve P represents dense sand and overconsolidated clay, while Curve Q represents loose sand and normally consolidated clay (B) Curve P represents dense sand and normally consolidated clay, while Curve Q represents loose sand and overconsolidated clay (C) Curve P represents loose sand and overconsolidated clay, while Curve Q represents dense sand and normally consolidated clay (D) Curve P represents loose sand and normally consolidated clay, while Curve Q represents dense sand and overconsolidated clay CE, Set-1 Copyright GATE 2021 Page 21 of 36 Civil Engineering (CE, Set-1) Q.32 A fluid flowing steadily in a circular pipe of radius R has a velocity that is everywhere parallel to the axis (centerline) of the pipe. The velocity distribution r2 along the radial direction is Vr = U 1 2 , where r is the radial distance as R measured from the pipe axis and U is the maximum velocity at r = 0. The average velocity of the fluid in the pipe is (A) U 2 (B) U 3 (C) U 4 (D) 5 U 6 CE, Set-1 Copyright GATE 2021 Page 22 of 36 Civil Engineering (CE, Set-1) Q.33 A water sample is analyzed for coliform organisms by the multiple-tube fermentation method. The results of confirmed test are as follows: Sample size (mL) Number of positive Number of negative results out of 5 tubes results out of 5 tubes 0.01 5 0 0.001 3 2 0.0001 1 4 The most probable number (MPN) of coliform organisms for the above results is to be obtained using the following MPN Index. MPN Index for Various Combinations of Positive Results when Five Tubes used per Dilution of 10.0 mL, 1.0 mL and 0.1 mL Combination of positive tubes MPN Index per 100 mL 0 2 4 11 1 3 5 19 4 2 0 22 5 3 1 110 The MPN of coliform organisms per 100 mL is (A) 1100000 (B) 110000 (C) 1100 (D) 110 CE, Set-1 Copyright GATE 2021 Page 23 of 36 Civil Engineering (CE, Set-1) Q.34 Ammonia nitrogen is present in a given wastewater sample as the ammonium ion (NH4+) and ammonia (NH3). If pH is the only deciding factor for the proportion of these two constituents, which of the following is a correct statement? (A) At pH above 9.25, only NH4+ will be present. (B) At pH below 9.25, NH3 will be predominant. (C) At pH 7.0, NH4+ and NH3 will be found in equal measures. (D) At pH 7.0, NH4+ will be predominant. Q.35 On a road, the speed density relationship of a traffic stream is given by u = 70 0.7k (where speed, u, is in km/h and density, k, is in veh/km). At the capacity condition, the average time headway will be (A) 0.5 s (B) 1.0 s (C) 1.6 s (D) 2.1 s CE, Set-1 Copyright GATE 2021 Page 24 of 36 Civil Engineering (CE, Set-1) Q.36 Q.55 Numerical Answer Type (NAT), carry TWO mark each (no negative marks). Q.36 The values of abscissa (x) and ordinate (y) of a curve are as follows: X y 2.0 5.00 2.5 7.25 3.0 10.00 3.5 13.25 4.0 17.00 By Simpson s 1/3rd rule, the area under the curve (round off to two decimal places) is ______________ Q.37 Vehicular arrival at an isolated intersection follows the Poisson distribution. The mean vehicular arrival rate is 2 vehicle per minute. The probability (round off to two decimal places) that at least 2 vehicles will arrive in any given 1-minute interval is ___________ CE, Set-1 Copyright GATE 2021 Page 25 of 36 Civil Engineering (CE, Set-1) Q.38 Refer the truss as shown in the figure (not to scale). Q R E, 2A E, A E, A P E, A E, A S T E, A E, A L L F If load, F = kN, moment of inertia, I = 8.33 106 mm4, area of crosssection, A = 104 mm2, and length, L = 2 m for all the members of the truss, the compressive stress (in kN/m2, in integer) carried by the member Q-R is _______ CE, Set-1 Copyright GATE 2021 Page 26 of 36 Civil Engineering (CE, Set-1) Q.39 A prismatic cantilever prestressed concrete beam of span length, L = 1.5 m has one straight tendon placed in the cross-section as shown in the following figure (not to scale). The total prestressing force of 50 kN in the tendon is applied at dc = 50 mm from the top in the cross-section of width, b = 200 mm and depth, d = 300 mm. If the concentrated load, P = 5 kN, the resultant stress (in MPa, in integer) experienced at point Q will be ________ CE, Set-1 Copyright GATE 2021 Page 27 of 36 Civil Engineering (CE, Set-1) Q.40 A column is subjected to a total load (P) of 60 kN supported through a bracket connection, as shown in the figure (not to scale). 100 mm 40 mm 40 mm P = 60 kN 30 mm R 30 mm The resultant force in bolt R (in kN, round off to one decimal place) is __________________ CE, Set-1 Copyright GATE 2021 Page 28 of 36 Civil Engineering (CE, Set-1) Q.41 Employ stiffness matrix approach for the simply supported beam as shown in the figure to calculate unknown displacements/rotations. Take length, L = 8 m; modulus of elasticity, E = 3 104 N/mm2; moment of inertia, I = 225 106 mm4. P A C E, 2I B E, I L 2 L 2 The mid-span deflection of the beam (in mm, round off to integer) under P = 100 kN in downward direction will be ________ Q.42 A square plate O-P-Q-R of a linear elastic material with sides 1.0 m is loaded in a state of plane stress. Under a given stress condition, the plate deforms to a new configuration O-P'-Q'-R' as shown in the figure (not to scale). Under the given deformation, the edges of the plate remain straight. y 10 mm R' Q' 10 mm Q R P' 10 mm O x P 20 mm The horizontal displacement of the point (0.5 m, 0.5 m) in the plate O-P-Q-R (in mm, round off to one decimal place) is ______________ CE, Set-1 Copyright GATE 2021 Page 29 of 36 Civil Engineering (CE, Set-1) Q.43 A small project has 12 activities N, P, Q, R, S, T, U, V, W, X, Y, and Z. The relationship among these activities and the duration of these activities are given in the Table. Activity Duration (in weeks) Depends upon N 2 - P 5 N Q 3 N R 4 P S 5 Q T 8 R U 7 R, S V 2 U W 3 U X 5 T, V Y 1 W Z 3 X, Y The total float of the activity V (in weeks, in integer) is _______________ CE, Set-1 Copyright GATE 2021 Page 30 of 36 Civil Engineering (CE, Set-1) Q.44 The soil profile at a construction site is shown in the figure (not to scale). Ground water table (GWT) is at 5 m below the ground level at present. An old well data shows that the ground water table was as low as 10 m below the ground level in the past. Take unit weight of water, w = 9.81 kN/m3. The overconsolidation ratio (OCR) (round off to two decimal places) at the mid-point of the clay layer is _____________ CE, Set-1 Copyright GATE 2021 Page 31 of 36 Civil Engineering (CE, Set-1) Q.45 A retaining wall of height 10 m with clay backfill is shown in the figure (not to scale). Weight of the retaining wall is 5000 kN per m acting at 3.3 m from the toe of the retaining wall. The interface friction angle between base of the retaining wall and the base soil is 20 . The depth of clay in front of the retaining wall is 2.0 m. The properties of the clay backfill and the clay placed in front of the retaining wall are the same. Assume that the tension crack is filled with water. Use Rankine s earth pressure theory. Take unit weight of water, w = 9.81 kN/m3. The factor of safety (round off to two decimal places) against sliding failure of the retaining wall after ignoring the passive earth pressure will be _________ CE, Set-1 Copyright GATE 2021 Page 32 of 36 Civil Engineering (CE, Set-1) Q.46 A combined trapezoidal footing of length L supports two identical square columns (P1 and P2) of size 0.5 m 0.5 m, as shown in the figure. The columns P1 and P2 carry loads of 2000 kN and 1500 kN, respectively. L 1.5 m 5m P2 P1 5m If the stress beneath the footing is uniform, the length of the combined footing L (in m, round off to two decimal places) is ______________ CE, Set-1 Copyright GATE 2021 Page 33 of 36 Civil Engineering (CE, Set-1) Q.47 An unsupported slope of height 15 m is shown in the figure (not to scale), in which the slope face makes an angle 50 with the horizontal. The slope material comprises purely cohesive soil having undrained cohesion 75 kPa. A trial slip circle KLM, with a radius 25 m, passes through the crest and toe of the slope and it subtends an angle 60 at its center O. The weight of the active soil mass (W, bounded by KLMN) is 2500 kN/m, which is acting at a horizontal distance of 10 m from the toe of the slope. Consider the water table to be present at a very large depth from the ground surface. O 60 M N L 50 K 15 m W 10 m Considering the trial slip circle KLM, the factor of safety against the failure of slope under undrained condition (round off to two decimal places) is ______________ Q.48 An unlined canal under regime conditions along with a silt factor of 1 has a width of flow 71.25 m. Assuming the unlined canal as a wide channel, the corresponding average depth of flow (in m, round off to two decimal places) in the canal will be __________ CE, Set-1 Copyright GATE 2021 Page 34 of 36 Civil Engineering (CE, Set-1) Q.49 A cylinder (2.0 m diameter, 3.0 m long and 25 kN weight) is acted upon by water on one side and oil (specific gravity = 0.8) on other side as shown in the figure. 1m R Water 2m Q P 1 m Oil of sp gr 0.8 The absolute ratio of the net magnitude of vertical forces to the net magnitude of horizontal forces (round off to two decimal places) is ___________ Q.50 A tube-well of 20 cm diameter fully penetrates a horizontal, homogeneous and isotropic confined aquifer of infinite horizontal extent. The aquifer is of 30 m uniform thickness. A steady pumping at the rate of 40 litres/s from the well for a long time results in a steady drawdown of 4 m at the well face. The subsurface flow to the well due to pumping is steady, horizontal and Darcian and the radius of influence of the well is 245 m. The hydraulic conductivity of the aquifer (in m/day, round off to integer) is ____________ Q.51 A baghouse filter has to treat 12 m3/s of waste gas continuously. The baghouse is to be divided into 5 sections of equal cloth area such that one section can be shut down for cleaning and/or repairing, while the other 4 sections continue to operate. An air-to-cloth ratio of 6.0 m3/min-m2 cloth will provide sufficient treatment to the gas. The individual bags are of 32 cm in diameter and 5 m in length. The total number of bags (in integer) required in the baghouse is ___________ CE, Set-1 Copyright GATE 2021 Page 35 of 36 Civil Engineering (CE, Set-1) Q.52 A secondary clarifier handles a total flow of 9600 m3/d from the aeration tank of a conventional activated-sludge treatment system. The concentration of solids in the flow from the aeration tank is 3000 mg/L. The clarifier is required to thicken the solids to 12000 mg/L, and hence it is to be designed for kg a solid flux of 3.2 2 . The surface area of the designed clarifier for m .h 2 thickening (in m , in integer) is _____________ Q.53 Spot speeds of vehicles observed at a point on a highway are 40, 55, 60, 65 and 80 km/h. The space-mean speed (in km/h, round off to two decimal places) of the observed vehicles is ____________ Q.54 The longitudinal section of a runway provides the following data: End-to-end runway (m) Gradient (%) 0 to 300 + 1.2 300 to 600 0.7 600 to 1100 + 0.6 1100 to 1400 0.8 1400 to 1700 1.0 The effective gradient of the runway (in %, round off to two decimal places) is ________________ Q.55 Traversing is carried out for a closed traverse PQRS. The internal angles at vertices P, Q, R and S are measured as 92 , 68 , 123 , and 77 , respectively. If fore bearing of line PQ is 27 , fore bearing of line RS (in degrees, in integer) is ______________ END OF THE QUESTION PAPER CE, Set-1 Copyright GATE 2021 Page 36 of 36 GATE 2021 Answer Key for Civil Engineering (CE 1) Graduate Aptitude Test in Engineering (GATE 2021) Subject/Paper: Civil Engineering (CE - 1) Q. No. Session Question Type MCQ/MSQ/NAT Section Name Answer Key/Range Marks Negative Marks 1 1 MCQ GA D 1 1/3 2 1 MCQ GA B 1 1/3 3 1 MCQ GA C 1 1/3 4 1 MCQ GA B 1 1/3 5 1 MCQ GA C 1 1/3 6 1 MCQ GA B 2 2/3 7 1 MCQ GA A 2 2/3 8 1 MCQ GA A 2 2/3 9 1 MCQ GA B 2 2/3 10 1 MCQ GA C 2 2/3 1 1 MCQ CE B 1 1/3 2 1 MCQ CE D 1 1/3 3 1 MCQ CE D 1 1/3 4 1 MCQ CE B 1 1/3 5 1 MCQ CE A 1 1/3 6 1 MCQ CE A 1 1/3 7 1 MCQ CE C 1 1/3 8 1 MCQ CE B 1 1/3 9 1 MCQ CE A 1 1/3 10 1 MCQ CE D 1 1/3 11 1 MCQ CE A 1 1/3 GATE 2021 Answer Key for Civil Engineering (CE 1) Q. No. Session Question Type MCQ/MSQ/NAT Section Name Answer Key/Range Marks Negative Marks 12 1 MCQ CE B 1 1/3 13 1 MCQ CE B 1 1/3 14 1 MCQ CE C 1 1/3 15 1 MCQ CE B 1 1/3 16 1 MCQ CE A 1 1/3 17 1 MSQ CE A; B; C 1 0 18 1 NAT CE 0.5 to 0.5 1 0 19 1 NAT CE 15 to 15 1 0 20 1 NAT CE 95 to 97 1 0 21 1 NAT CE 2 to 2 1 0 22 1 NAT CE 0.9 to 0.9 1 0 23 1 NAT CE 4.88 to 4.92 1 0 24 1 NAT CE 2400 to 2400 1 0 25 1 NAT CE 60.7 to 61.1 1 0 26 1 MCQ CE A 2 2/3 27 1 MCQ CE B 2 2/3 28 1 MCQ CE C 2 2/3 29 1 MCQ CE D 2 2/3 30 1 MCQ CE B 2 2/3 31 1 MCQ CE A 2 2/3 32 1 MCQ CE A 2 2/3 33 1 MCQ CE B 2 2/3 34 1 MCQ CE D 2 2/3 GATE 2021 Answer Key for Civil Engineering (CE 1) Q. No. Session Question Type MCQ/MSQ/NAT Section Name Answer Key/Range Marks Negative Marks 35 1 MCQ CE D 2 2/3 36 1 NAT CE 20.00 to 21.00 2 0 37 1 NAT CE 0.58 to 0.60 2 0 38 1 NAT CE 490 to 510 2 0 39 1 NAT CE 0 to 0 2 0 40 1 NAT CE 27.0 to 29.0 2 0 41 1 NAT CE 100 to 130 2 0 42 1 NAT CE 2.4 to 2.6 2 0 43 1 NAT CE 0 to 0 2 0 44 1 NAT CE 1.18 to 1.26 2 0 45 1 NAT CE 4.20 to 4.35 2 0 46 1 NAT CE 5.75 to 5.90 2 0 47 1 NAT CE 1.94 to 1.98 2 0 48 1 NAT CE 2.80 to 2.95 2 0 49 1 NAT CE 0.35 to 0.40 2 0 50 1 NAT CE 34 to 38 2 0 51 1 NAT CE 30 to 30 2 0 52 1 NAT CE 375 to 375 2 0 53 1 NAT CE 55.50 to 58.50 2 0 54 1 NAT CE 0.30 to 0.34 2 0 55 1 NAT CE 196 to 196 2 0

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