Gate CE-Civil Engineering questions with answers,
Gate-2012 CE : CIVIL ENGINEERING
Duration: Three Hours Maximum Marks: 100
Read the following instructions carefully.
1. Do not open the seal of the Question Booklet until you are asked to do so by the invigilator.
2. Take out the Optical Response Sheet (ORS) from this Question Booklet without breaking the sealand read the instructions printed on the ORS carefully.
3. On the right half of the ORS, using ONLY a black ink ball point pen, (i) darken the bubble corresponding to your test paper code and the appropriate bubble under each digit of your registration number and (ii) write your registration number, your name and name of the examination centre and put your signature at the specified location.
4. This Question Booklet contains 16 pages including blank pages for rough work. After you are permitted to open the seal, please check all pages and report discrepancies, if any, to the invigilator.
5. There are a total of 65 questions carrying 100 marks. All these questions are of objective type. Each question has only one correct answer. Questions must be answered on the left hand side of the ORS by darkening the appropriate bubble (marked A, B, C, D) using ONLY a black ink ball point pen against the question number. For each question darken the bubble of the correct answer. More than one answer bubbled against a question will be treated as an incorrect response.
6. Since bubbles darkened by the black ink ball point pen cannot be erased, candidates should darken the bubbles in the ORS very carefully.
7. Questions Q.1 – Q.25 carry 1 mark each. Questions Q.26 – Q.55 carry 2 marks each. The 2 marks questions include two pairs of common data questions and two pairs of linked answer questions. The answer to the second question of the linked answer questions depends on the answer to the first question of the pair. If the first question in the linked pair is wrongly answered or is unattempted, then the answer to the second question in the pair will not be evaluated.
8. Questions Q.56 – Q.65 belong to General Aptitude (GA) section and carry a total of 15 marks. Questions Q.56 – Q.60 carry 1 mark each, and questions Q.61 – Q.65 carry 2 marks each.
9. Unattempted questions will result in zero mark and wrong answers will result in NEGATIVE marks .For all 1 mark questions, ? mark will be deducted for each wrong answer. For all 2 marks questions,? mark will be deducted for each wrong answer. However, in the case of the linked answer questionpair, there will be negative marks only for wrong answer to the first question and no negative marksfor wrong answer to the second question.
10. Calculator is allowed whereas charts, graph sheets or tables are NOT allowed in the examination hall.
11. Rough work can be done on the question paper itself. Blank pages are provided at the end of the question paper for rough work.
12. Before the start of the examination, write your name and registration number in the space provided below using a black ink ball point pen.
2012 CIVIL ENGINEERING - CE
Q. 1 – Q. 25 carry one mark each.
Q.2 The annual precipitation data of a city is normally distributed with mean and standard deviation as1000 mm and 200 mm, respectively. The probability that the annual precipitation will be more than1200 mm is
(A) < 50% -Answer
Q.5 The following statements are related to bending of beams:
I The slope of the bending moment diagram is equal to the shear force.
II The slope of the shear force diagram is equal to the load intensity.
III The slope of the curvature is equal to the flexural rotation.
IV The second derivative of the deflection is equal to the curvature.
The only FALSE statement is
(C) III -Answer
Q.6 If a small concrete cube is submerged deep in still water in such a way that the pressure exerted on all faces of the cube is p, then the maximum shear stress developed inside the cube is
(A) 0 -Answer
Q.7 As per IS 456:2000, in the Limit State Design of a flexural member, the strain in reinforcing bars under tension at ultimate state should not be less than
Q.8 Which one of the following is categorised as a long-term loss of prestress in a prestressed concrete member?
(A) Loss due to elastic shortening
(B) Loss due to friction
(C) Loss due to relaxation of strands -Answer
(D) Loss due to anchorage slip
Q.9 In a steel plate with bolted connections, the rupture of the net section is a mode of failure under
(A) tension -Answer
Q.10 The ratio of the theoretical critical buckling load for a column with fixed ends to that of anothercolumn with the same dimensions and material, but with pinned ends, is equal to
Q.11 The effective stress friction angle of a saturated, cohesionless soil is 38?. The ratio of shear stress to normaleffective stress on the failure plane is
(A) 0.781 -Answer
Q.12 Two series of compaction tests were performed in the laboratory on an inorganic clayey soil employing two different levels of compaction energy per unit volume of soil. With regard to the above tests, the following two statements are made.
I The optimum moisture content is expected to be more for the tests with higher energy.
II The maximum dry density is expected to be more for the tests with higher energy.
The CORRECT option evaluating the above statements is
(A) Only I is TRUE
(B) Only II is TRUE-Answer
(C) Both I and II are TRUE
(D) Neither I nor II is TRUE
Q.13 As per the Indian Standard soil classification system, a sample of silty clay with liquid limit of 40% and plasticity index of 28% is classified as
(B) CI -Answer
Q.14 A smooth rigid retaining wall moves as shown in the sketch causing the backfill material to fail. The backfill material is homogeneous and isotropic, and obeys the Mohr-Coulomb failure criterion. The majorprincipal stress is
(A) parallel to the wall face and acting downwards
(B) normal to the wall face-Answer
(C) oblique to the wall face acting downwards
(D) oblique to the wall face acting upwards
Q.15 An embankment is to be constructed with a granular soil (bulk unit weight = 20 kN/m3) on a saturated clayey silt deposit (undrained shear strength = 25 kPa). Assuming undrained general shear failure and bearing capacity factor of 5.7, the maximum height (in m) of the embankment at the point of failure is
(A) 7.1 -Answer
Q.16 A trapezoidal channel is 10.0 m wide at the base and has a side slope of 4 horizontal to 3 vertical. The bed slope is 0.002. The channel is lined with smooth concrete (Manning’s n = 0.012). Thehydraulic radius (in m) for a depth of flow of 3.0 m is
Q.17 A rectangular open channel of width 5.0 m is carrying a discharge of 100 m3/s. The Froude number of the flow is 0.8. The depth of flow (in m) in the channel is
(A) 4 -Answer
Q.18 The circular water pipes shown in the sketch are flowing full. The velocity of flow (in m/s) in the branch pipe “R” is
(B) 4 -Answer
Q.19 The ratio of actual evapo-transpiration to potential evapo-transpiration is in the range
(A) 0.0 to 0.4
(B) 0.6 to 0.9
(C) 0.0 to 1.0 -Answer
(D) 1.0 to 2.0
Q.20 A sample of domestic sewage is digested with silver sulphate, sulphuric acid, potassium dichromate and mercuric sulphate in chemical oxygen demand (COD) test. The digested sample is then titratedwith standard ferrous ammonium sulphate (FAS) to determine the un-reacted amount of
(A) mercuric sulphate
(B) potassium dichromate-Answer
(C) silver sulphate
(D) sulphuric acid
Q.21 Assertion [a]: At a manhole, the crown of the outgoing sewer should not be higher than the crown of the incoming sewer.
Reason [r]: Transition from a larger diameter incoming sewer to a smaller diameter outgoing sewer at a manhole should not be made.The CORRECT option evaluating the above statements is :
(A) Both [a] and [r] are true and [r] is the correct reason for [a]-Answer
(B) Both [a] and [r] are true but [r] is not the correct reason for [a]
(C) Both [a] and [r] are false
(D) [a] is true but [r] is false
Q.22 Two major roads with two lanes each are crossing in an urban area to form an un-controlled intersection. The number of conflict points when both roads are one-way is “X” and when both roads are two-way is “Y”. The ratio of X to Y is
Q.23 Two bitumen samples “X” and “Y” have softening points 45?C and 60?C, respectively. Consider the following statements:
I. I Viscosity of “X” will be higher than that of “Y” at the same temperature.
II Penetration value of “X” will be lesser than that of “Y” under standard conditions.
The CORRECT option evaluating the above statements is
(A) Both I and II are TRUE
(B) I is FALSE and II is TRUE
(C) Both I and II are FALSE
(D) I is TRUE and II is FALSE-Answer
Q.24 Road roughness is measured using
(A) Benkelman beam
(B) Bump integrator-Answer
(C) Dynamic cone penetrometer
(D) Falling weight deflectometer
Q.25 Which of the following errors can be eliminated by reciprocal measurements in differentialleveling?
I Error due to earth’s curvature
II Error due to atmospheric refraction
(A) Both I and II
(B) I only
(C) II only
(D) Neither I nor II
Q.32 The sketch shows a column with a pin at the base and rollers at the top. It is subjected to an axial force P and amoment M at mid-height. The reaction(s) at R is/are-
(A) a vertical force equal to P
(B) a vertical force equal to P/2
(C) a vertical force equal to P and a horizontal force equal to M/h
(D) a vertical force equal to P/2 and a horizontal force equal to M/h
Q.33 A concrete beam prestressed with a parabolic tendon is shown in the sketch. The eccentricity of the tendon is measured from the centroid of the cross-section. The applied prestressing force at service is 1620 kN. The uniformly distributed load of 45 kN/m includes the self-weight. The stress (in N/mm2) in the bottom fibre at mid-span is_
(A) tensile 2.90
(B) compressive 2.90
(C) tensile 4.32
(D) compressive 4.32
Q.34 A symmetric frame PQR consists of two inclined members PQ and QR, connected at ‘Q’ with a rigid joint, and hinged at ‘P’ and ‘R’. The horizontal length PR is l. If a weight W is suspended at‘Q’, the bending moment at ‘Q’ is
Q.35 Two plates are connected by fillet welds of size 10 mm and subjected to tension, as shown in the sketch. The thickness of each plate is 12 mm. The yield stress and the ultimate tensile stress of steel are 250 MPa and 410 MPa, respectively. The welding is done in the workshop (?mw = 1.25). As per the Limit State Method ofIS 800:2007, the minimum length (rounded off to the nearest higher multiple of 5 mm) of each weld to transmit a force P equal to 270 kN is
(A) 100 mm
(B) 105 mm
(C) 110 mm
(D) 115 mm
Q.36 Two soil specimens with identical geometric dimensions were subjected to falling head permeability tests in the laboratory under identical conditions. The fall of water head was measured after an identical time interval. The ratio of initial to final water heads for the test involving the first specimen was 1.25. If the coefficient of permeability of the second specimen is 5-times that of the first, the ratio of initial to final water heads in the test involving the second specimen is
Q.37 A layer of normally consolidated, saturated silty clay of 1 m thickness is subjected to one dimensional consolidation under a pressure increment of 20 kPa. The properties of the soil are: specific gravity = 2.7, natural moisture content = 45%, compression index = 0.45, and recompression index = 0.05. The initial average effective stress within the layer is 100 kPa.
Assuming Terzaghi’s theory to be applicable, the primary consolidation settlement (rounded off to the nearest mm) is
(A) 2 mm
(B) 9 mm
(C) 14 mm
(D) 16 mm
Q.38 Steady state seepage is taking place through a soil element at Q,2 m below the ground surface immediately downstream of thetoe of an earthen dam as shown in the sketch. The water level in a piezometer installed at P, 500 mm above Q, is at the ground surface. The water level in a piezometer installed at R, 500 mm below Q, is 100 mm above the ground surface. The bulk saturated unit weight of the soil is 18 kN/m3 and the unit weight of water is 9.81 kN/m3. The vertical effective stress (in kPa) atQ is
Q.39 The top width and the depth of flow in a triangular channel were measured as 4 m and 1 m, respectively. The measured velocities on the centre line at the water surface, 0.2 m and 0.8 m below the surface are 0.7 m/s, 0.6 m/s and 0.4 m/s, respectively. Using two-point method of velocitymeasurement, the discharge (in m3/s) in the channel is
Q.40 Group I contains parameters and Group II lists methods/instruments.
Group I Group II
P. Streamflow velocity 1. Anemometer
Q. Evapo-transpiration rate 2. Penman’s method
R. Infiltration rate 3. Horton’s method
S. Wind velocity 4. Current meter
The CORRECT match of Group I with Group II is
(A) P – 1, Q – 2, R – 3, S – 4
(B) P – 4, Q – 3, R – 2, S – 1
(C) P – 4, Q – 2, R – 3, S – 1
(D) P – 1, Q – 3, R – 2, S – 4
Q.41 Wheat crop requires 55 cm of water during 120 days of base period. The total rainfall during this period is 100 mm. Assume the irrigation efficiency to be 60%. The area (in ha) of the land which can be irrigated with a canal flow of 0.01 m3/s is
Q.42 A water sample has a pH of 9.25. The concentration of hydroxyl ions in the water sample is
(A) 10-9.25 moles/L
(B) 10-4.75 mmoles/L
(C) 0.302 mg/L
(D) 3.020 mg/L
Q.43 A town is required to treat 4.2 m3/min of raw water for daily domestic supply. Flocculating particles are to be produced by chemical coagulation. A column analysis indicated that an overflow
rate of 0.2 mm/s will produce satisfactory particle removal in a settling basin at a depth of 3.5 m. The required surface area (in m2 ) for settling is
Q.44 A pavement designer has arrived at a design traffic of 100 million standard axles for a newly developing national highway as per IRC:37 guidelines using the following data: design life = 15 years, commercial vehicle count before pavement construction = 4500 vehicles/day, annual traffic growth rate = 8%. The vehicle damage factor used in the calculation was
Q.45 The following data are related to a horizontal curved portion of a two-lane highway: length of curve = 200 m, radius of curve = 300 m and width of pavement = 7.5 m. In order to provide a stopping sight distance (SSD) of 80 m, the set back distance (in m) required from the centre line of
the inner lane of the pavement is
Q.46 A two-lane urban road with one-way traffic has a maximum capacity of 1800 vehicles/hour. Underthe jam condition, the average length occupied by the vehicles is 5.0 m. The speed versus densityrelationship is linear. For a traffic volume of 1000 vehicles/hour, the density (in vehicles/km) is
Q.47 The horizontal distance between two stations P and Q is 100 m. The vertical angles from P and Qto the top of a vertical tower at T are 3? and 5? above horizontal, respectively. The vertical anglesfrom P and Q to the base of the tower are 0.1? and 0.5? below horizontal, respectively. Stations P,Q and the tower are in the same vertical plane with P and Q being on the same side of T. Neglectingearth’s curvature and atmospheric refraction, the height (in m) of the tower is
Common Data Questions
Common Data for Questions 48 and 49:
The flow net around a sheet pile wall is shown in the sketch. The properties of the soil are: permeability coefficient = 0.09 m/day (isotropic),specific gravity = 2.70 and void ratio = 0.85. The sheet pile wall and the bottom of the soil are impermeable.
Q.48 The seepage loss (in m3 per day per unit length of the wall) of water is
Q.49 The factor of safety against the occurrence of piping failure is
Common Data for Questions 50 and 51:
An activated sludge system (sketched below) is operating at equilibrium with the following information. Wastewater related data: flow rate = 500 m3/hour, influent BOD = 150 mg/L, effluent BOD = 10 mg/L. Aeration tank related data: hydraulic retention time = 8 hours, mean-cell-residence time = 240 hours, volume = 4000 m3, mixed liquor suspended solids = 2000 mg/L
Q.50 The food-to-biomass (F/M) ratio (in kg BOD per kg biomass per day) for the aeration tank is
Q.51 The mass (in kg/day) of solids wasted from the system is
Linked Answer Questions-image
Statement for Linked Answer Questions 52 and 53:
The cross-section at mid-span of a beam at the edge of a slab is shown in the sketch. A portion of the slab is considered as the effective flange width for the beam. The grades of concrete and reinforcing steel are M25 and Fe415, respectively. The total area of reinforcing bars (As) is 4000 mm2. At the ultimate limit state, xu denotes the depth of the neutral axis from the top fibre. Treat the section as under-reinforced and flanged (xu > 100 mm).
Q.52 The value of xu (in mm) computed as per the Limit State Method of IS 456:2000 is
Q.53 The ultimate moment capacity (in kNm) of the section, as per the Limit State Method of IS 456:2000 is
Statement for Linked Answer Questions 54 and 55:
The drainage area of a watershed is 50 km2. The ? index is 0.5 cm/hour and the base flow at the outlet is 10 m3/s. One hour unit hydrograph (unit depth = 1 cm) of the watershed is triangular in shape with a time
base of 15 hours. The peak ordinate occurs at 5 hours.
Q.54 The peak ordinate (in m3/s/cm) of the unit hydrograph is
Q.55 For a storm of depth of 5.5 cm and duration of 1 hour, the peak ordinate (in m3/s) of the hydrograph is
General Aptitude (GA) Questions
Q. 56 – Q. 60 carry one mark each.
Q.56 Choose the most appropriate alternative from the options given below to complete the following sentence:
Despite several ––––––––– the mission succeeded in its attempt to resolve the conflict.
Q.57 The cost function for a product in a firm is given by 5q2, where q is the amount of production. The firm can sell the product at a market price of 50 per unit. The number of units to be produced by the firm such that the profit is maximized is
Q.58 Choose the most appropriate alternative from the options given below to complete the following sentence:
Suresh’s dog is the one ––––––––– was hurt in the stampede.
Q.59 Choose the grammatically INCORRECT sentence:
(A) They gave us the money back less the service charges of Three Hundred rupees.
(B) This country’s expenditure is not less than that of Bangladesh.
(C) The committee initially asked for a funding of Fifty Lakh rupees, but later settled for a lesser sum.
(D) This country’s expenditure on educational reforms is very less.
Q.60 Which one of the following options is the closest in meaning to the word given below? Mitigate
Q. 61 - Q. 65 carry two marks each.
Q.61 A political party orders an arch for the entrance to the ground in which the annual convention is being held. The profile of the arch follows the equation y = 2x – 0.1x2 where y is the height of the
arch in meters. The maximum possible height of the arch is
(A) 8 meters
(B) 10 meters
(C) 12 meters
(D) 14 meters
Q.62 Wanted Temporary, Part-time persons for the post of Field Interviewer to conduct personal interviews to collect and collate economic data. Requirements: High School-pass, must be
available for Day, Evening and Saturday work. Transportation paid, expenses reimbursed. Which one of the following is the best inference from the above advertisement?
(C) Not designed to make the post attractive
(D) Not gender-discriminatory
Q.63 Given the sequence of terms, AD CG FK JP, the next term is
Q.64 Which of the following assertions are CORRECT?
P: Adding 7 to each entry in a list adds 7 to the mean of the list
Q: Adding 7 to each entry in a list adds 7 to the standard deviation of the list
R: Doubling each entry in a list doubles the mean of the list
S: Doubling each entry in a list leaves the standard deviation of the list unchanged
(A) P, Q
(B) Q, R
(C) P, R
(D) R, S
Q.65 An automobile plant contracted to buy shock absorbers from two suppliers X and Y. X supplies60% and Y supplies 40% of the shock absorbers. All shock absorbers are subjected to a quality test. The ones that pass the quality test are considered reliable. Of X’s shock absorbers, 96% are reliable. Of Y’s shock absorbers, 72% are reliable.The probability that a randomly chosen shock absorber, which is found to be reliable, is made by Y is