In an artesian aquifer, the draw downs in two observation wells at distances 100 m, and 200 m
were found same after one hour and x hours respectively. The value of x, is
(A) 2 hours
(B) 4 hours
(C) 9 hours
(D) 16 hours
Description : When a constant discharge 2.91 litres/sec. was obtained in a pumping test, the draw downs in the test wells at 3 m and 6.184 m were 2.6 m and 0.3 m respectively. If over-all depth of the pumping well was 16 m, the ... (A) 0.0005 cm/sec (B) 0.001 cm/sec (C) 0.002 cm/sec (D) 0.01 cm/sec
Last Answer : Answer: Option B
Description : Pick up the correct statement from the following: (A) A confined bed of impervious material laid over an aquifer, is known as an aquiclude (B) The top most water bearing strata having no aquifer, is ... water from the top most water bearing strata, are called water table wells (D) All the above
Last Answer : Answer: Option D
Description : For the same draw down in two observations wells at distances r1 and r2, the times after start of pumping are t1 and t2 hours respectively. The relation which holds good is (A) t2 = r2/r1 × t1 (B) t2 = (r2/r1)² × t1 (C) t2 = (r2/r1)3 × t1 (D) t2 = (r2/r1) × t1 2
Last Answer : (B) t2 = (r2/r1)² × t1
Description : A well is sunk in an unconfined aquifer having a saturated depth of 100 m. Assuming the equilibrium flow conditions and a homogeneous aquifer and radius of influence to be same, the ratio of discharges at 20 m and 40 m draw downs, is (A) 2/3 (B) 5/4 (C) 4/5 (D) 8/7
Description : The principal aquifer of the artesian wells of Florida is a: w) porous sandstone x) fissured limestone y) series of clay beds z) mass of pumice
Last Answer : ANSWER: X -- FISSURED LIMESTONE
Description : The coefficients of permeability of soils of an unconfined aquifer and another confined aquifer were determined by pumping water from the wells and observing the effect of water table in two test wells at equal distances was found to be equal. ... (B) H = h1 - h2 (C) H = h2 + h1 (D) ½ (h1 + h2)
Description : Two observation wells penetrating into a confined aquifer are located 1500 m apart in the direction of flow. Heads of 50 m and 25 m are indicated at these two observation wells. If the coefficient of permeability for the ... well to another is (a) 75 days (b) 750 days (c) 1200 days (d) 3000 days
Last Answer : (b) 750 days
Description : An aquiclude is (A) A non artesian aquifer (B) An artesian aquifer (C) A confined bed of impervious material between aquifers (D) A large water body underground
Last Answer : (C) A confined bed of impervious material between aquifers
Description : S1 and S2 are the draw downs in an observation well at times t1 and t2 after pumping. For discharge Q and coefficient of transmissibility T, the relationship, is (A) S2 - S1 = (2.3Q/ ) log10 (t2/t1) (B) S2 - S1 ... - S1 = (2.3Q/4 ) loge (t2/t1) (D) S2 - S1 = (2.3Q/4 ) loge (t1/t2
Last Answer : (B) S2 - S1 = (2.3Q/4 ) log10 (t2/t1)
Description : The aquifer of a famous artesian formation in the Great Plains is a layer of rock called the: w) Clinton limestone x) Dakota sandstone y) Pierre shale z) Vermont marble
Last Answer : ANSWER: X -- DAKOTA SANDSTONE
Description : Ground water from artesian wells (A) Contains no suspended materials (B) Contains dissolved salts (C) May be saltish and hard (D) All the above
Last Answer : (D) All the above
Description : An earth formation which, although porous and capable of absorbing water does not provide an appreciable supply to wells, is known as (A) Aquifer (B) Aquiclude (C) Aquifuge (D) None of these
Last Answer : (B) Aquiclude
Description : The surface joining the static levels in several non-pumping wells penetrating a continuous confined aquifer represents (a) Water-table surface (b) Capillary fringe (c) Piezometric surface of the aquifer (d) Physical top surface of the aquifer
Last Answer : (c) Piezometric surface of the aquifer
Description : A well penetrates to 30 m below the static water table. After 24 hours of pumping at 31.40 litres/minute, the water level in a test well at a distance of 80 m is lowered by 0.5 m and in a well 20 m away water is ... 1.185 m2 /minute (B) 1.285 m2 /minute (C) 1.385 m2 /minute (D) 1.485 m2 /minute
Last Answer : Answer: Option C
Description : A thief is noticed by a policeman from a distance of 200 m. The thief starts running and the policeman chases him. The thief and the policeman run at the rate of 10 km and 11 km per hour respectively. What is the distance between them after 6 minutes? A.100 m B.150 m C.190 m D.200 m E.None of these
Last Answer : Answer- A(100m) Explanation: Relative speed of the thief and policeman = (11 – 10) km/hr = 1 km/hr Distance covered in 6 minutes =[(1/60)*6] km = (1/10)km = 100 m. Distance between the thief and policeman = (200 – 100) m = 100 m.
Description : The Dupuit formula is based on (A) One observation well (B) Two observation wells (C) Three observation wells (D) No observation well
Description : Specific capacity or yield of wells, is generally expressed, as (A) m 3 per sec (B) m 3 /hour (C) m 3 /hour/m2 (D) m 3 /hour/m2 /m
Last Answer : (D) m 3 /hour/m2 /m
Description : When a TREND is included at the end of a METAR, the trend is a forecast valid for: a. 1 hour after the time of observation b. 2 hours after the time of observation c. 2 hours after it was issued d. 1 hour after it was issued
Last Answer : b. 2 hours after the time of observation
Description : During a period 17, 500 labour hours were worked at a standard cost of Rs 6.50 per hour. The labour efficiency variance was Rs 7,800 favourable. How many standard hours were produced? (a) 1,200 (b) 16,300 (c) 17,500 (d) 18,700
Last Answer : (d) 18,700
Description : Transverse joints are provided at distances varying from (A) 10 m to 15 m (B) 12 m to 18 m (C) 16 m to 24 m (D) 17 m to 27 m
Description : If the viscosity of ground water is 1.00, the Slitcher's constant is 400, the effective size of soil particles in aquifer is 0.5 mm and hydraulic gradient is 1 in 80, the velocity of flow is (A) 0.25 m/day (B) 0.50 m/day (C) 1.00 m/day (D) 1.25 m/day
Description : A tank has two inlet pipes, A and B, which can fill the tank in 12 hours and 18 hours respectively, and an outlet C which can empty the tank in 9 hour
Last Answer : A tank has two inlet pipes, A and B, which can fill the tank in 12 hours and 18 hours ... time taken right from the start to fill the tank.
Description : Two, trains, one from Howrah to Patna and the other from Patna to Howrah, start simultaneously. After they meet, the trains reach their destinations after 9 hours and 16 hours respectively. The ratio of their speeds is: A. 1: 2 B. 4 : 3 C. 7 : 8 D. 3 : 4 E. none of these
Last Answer : Answer- B (4:3) Explanation: Let us name the trains as A and B. Then, trick formula (A’s speed) : (B’s speed) = square root of b : square-root of a =square-root of 16 : square-root of 9 = 4 : 3.
Description : For determining the support reactions at A and B of a three hinged arch, points B and Care joined and produced to intersect the load line at D and a line parallel to the load line through A at D'. Distances AD, DD ... reactions at A and B is (A) 30° (B) 45° (C) 60° (D) 90
Last Answer : (D) 90
Description : A and B walk around a circular track. They start at 8 a.m. from the same point in the opposite directions. A and B walk at a speed of 2 rounds per hour and 3 rounds per hour respectively. How many times shall they cross each other before 9.30 a.m.? A.15 B.8 C.7 D.10 E.None of these
Last Answer : Answer – C (7) Explanation – Relative speed = (2 + 3) = 5 rounds per hourSo, they cross each other 5 times in an hour and 2 times in half an hourHence, they cross each other 7 times before 9.30 a.m.
Description : Pick up the correct statement from the following: (A) Perched aquifer is found in unconfined aquifer (B) The top surface of the water held in the perched aquifer, is known as perched water table (C) Perched aquifer is formed in unfined acquirer if an impervious layer exists (D) All the above
Description : For two charges 3C and -3C separated by 1cm and are located at distances 5cm and 7cm respectively from the point P, then the distance between their midpoint and the point P will be a) 5.91 b) 12.6 c) 2 d) 9
Last Answer : a) 5.91
Description : What is the maximum shear stress induced in a solid shaft of 50 mm diameter which is subjected to both bending moment and torque of 300 kN.mm and 200 kN.mm respectively? a. 9.11 N/mm2 b. 14.69 N/mm2 c. 16.22 N/mm2 d. 20.98 N/mm2
Last Answer : b. 14.69 N/mm2
Description : If f1 and f2 are the distances from the optical centre of a convex lens of focal length to conjugate two points P1 and P2 respectively, the following relationship holds good (A) f = f1 + f2 (B) f = ½ (f1 + f2) (C) 1/f = 1/f1 + 1/f2 (D) None of these
Last Answer : (C) 1/f = 1/f1 + 1/f2
Description : The ratio of the distances at which a stated length can be distinguished by the telescope and the human eye, respectively, is called (A) Brightness of telescope (B) Magnification of telescope (C) Resolving power of telescope (D) None of these
Last Answer : (C) Resolving power of telescope
Description : A train overtakes two girls walking along a railway track. The first girl walks at 9 km/hr. The other girl walks at 10.8 km/hr. The train needs 16.8 and 17 seconds respectively to overtake them. What is the speed of the ... in the same direction as the train? A) 25 m/s B) 45 m/s C) 30m/s D) 40m/s
Last Answer : ANSWER:B Explanation: First girl speed = 9km/hr = 9 * 5 / 18 m/s = 5/2 m/s = 2.5 m/s second girl speed = 10.8 km/hr = 10.8 * 5/18 m/s = 54/18 = 3 m/s Let the speed of the train ... x - 3) * 17 16.8x - 42 = 17x - 51 0.2x = 9 x = 45 Therefore the speed of the train is 45 m/s
Description : DGPS is based on the concept that bias errors in the position of locations in a given local area, are same if their distances are within (A) 25 km (B) 50 km (C) 75 km (D) 100 km
Description : Higher yield may be expected from (A) Gravity springs (B) Surface springs (C) Artesian springs (D) All the above
Last Answer : (C) Artesian springs
Description : Surface water is obtained from (A) Well (B) Springs (C) Artesian well (D) Rain
Last Answer : (D) Rain
Description : Perched aquifers generally occur (A) Below water table (B) Above water table (C) In aquicludes (D) In artesian aquifers
Last Answer : (B) Above water table
Description : Continuous flow of water can be expected from (A) Gravity springs (B) Surface springs (C) Artesian springs (D) None of these
Description : The mean of 8 article was found to be 15. On rechecking, it was found that two article were wrongly taken as 11 and 9 instead of 16 and 14 respectively. Find the correct mean. A) 17.25 B) 13.65 C) 16.54 D) 16.25
Last Answer : D) Calculated mean of 8 articles = 15 Incorrect sum of these 8 articles = (15*8) = 120. Correct sum of these 8 articles = (incorrect sum) - (sum of incorrect articles) + (sum of actual articles) = [120 ... (30)] = 130 Therefore, correct mean = 130/8 = 16.25 Hence, the correct mean is 16.25.
Description : A sewer has a diameter of 300 mm and slop of 1 in 400. While running full it has a mean velocity of 0.7 m/s. If both the diameter and slope are doubled (to respectively be 600 mm and 1 in 200), what will be the changed mean velocity ... 's formula. (a) 1.59 m/s (b) 2.80 m/s (c) 0.90 m/s (d) 1.00 m/s
Last Answer : (a) 1.59 m/s
Description : Derivation of Thiem's formula Q = 2 (s1 - s2)/2.3 log10 (r2/r1) is based on the assumption (A) The aquifer is homogeneous, isotropic and of infinite depth and area (B) The well is sunk ... (C) The flow lines are radial and horizontal, and the flow is laminar (D) All the above
Description : Pick up the incorrect statement from the following: (A) The rate of flow of water through a unit cross-sectional area under a unit hydraulic gradient, is called coefficient of permeability (B) ... aquifers, is governed by the Darcy's law (D) The term 'transmissibility' was introduced by Meinzer
Description : the derivation of Thiem's formula, Q = (S1 - S2)/[2.3 log10( / )] the following assumption is not applicable (A) The aquifer is homogeneous and isotropic (B) Flow lines are radial and ... the water surface is too small (D) The well has been sunk up to the surface of the unconfined aquifer
Description : While calculating the sight distances, the driver's eye above road surface, is assumed (A) 90 cm (B) 100 cm (C) 110 cm (D) 120 cm
Description : Two satellites A and B are revolving around a planet. Their periods of revolution are 1 hour and 8 hours respectively.
Last Answer : Two satellites A and B are revolving around a planet. Their periods of revolution are 1 hour and 8 ... 104 km. find radius of orbit of satellite A.
Description : The normal altitude of GPS satellite is about (A) 16,200 km (B) 20,200 km (C) 24,400 km (D) 36,100 km
Description : During September, 300 labour hours were worked for a total cost of Rs 4800. The variable overhead expenditure variance was Rs 600 (A). Overheads are assumed to be related to direct labour hours of active working. What was the standard cost per labour hour? (a) Rs 14 (b) Rs 16.50 (c) Rs 17.50
Last Answer : (a) Rs 14
Description : How many hours will a 200 amp hour battery last at 168 watt?
Last Answer : If it is a car battery (as given in the category) it is reasonably safe to assume that under load it is about 12V. I = P/E = 168W / 12V = 14A T = 200AH / 14A = 14.29H However ... battery. This is also assuming that the car battery is not being charged at any time while the load is present.
Description : A lead-acid battery can deliver 20 amperes continuously for 10 hours with an ampere-hour rating of ____________. A. 20 B. 40 C. 200 D. 400
Last Answer : Answer: C
Description : CG Co manufactures a single product T. Budgeted production output of product T during June is 200 units. Each unit of product T requires 6 labour hours for completion and CG Co anticipates 20 per cent idle time. Labour is paid at ... for March is (a) Rs 6,720 (b) 8,400 (c) 10,080 (d) 10,500
Last Answer : (d) 10,500
Description : The minimum range for sliding the focusing lens in the internal focusing telescope for focusing at all distances beyond 4 m is (A) 5 mm (B) 10 mm (C) 15 mm (D) 20 mm
Last Answer : (D) 20 mm