Hydrology PYQs Updated PDF

 AKSHAY SIR - 8447765100 Chapter- 01 Introduction to Hydrology and Precipitation 1. Isohyetal method is used for determination of (A) Evapotranspiration (GES-245 R&B & NWRWSK ADVT. NO. 39/2017-18)...

 AKSHAY SIR - 8447765100 Chapter- 01 Introduction to Hydrology and Precipitation 1. Isohyetal method is used for determination of (A) Evapotranspiration (GES-245 R&B & NWRWSK ADVT. NO. 39/2017-18) (B) seepage loss I R (C) Precipitation (D) intensity of flood S A Y 2. Which of the following is a non-recording type of rain gauge? S H (GES-245 R&B & NWRWSK ADVT. NO. 39/2017-18) (A) Symon's gauge (C) Syphon type (B) Tipping-bucket type (D) Weighing bucket type A K BY 3. To convert the point values of precipitation at various stations into mean precipitation over an area can be obtained using M Y (AE-73 (Special Drive) NWRWSK Advt. No. 40/2017-18) (A) Rational method D E (B) Geometrical progression method (C) Isohyetal method C A (D) Isometric mean method A 4. Hydrological draught is indicated by I C (AE-73 (Special Drive) NWRWSK Advt. No. 40/2017-18) T (A) Precipitation less than 25% from normal value. S L I (B) Inadequate soil moisture during growing season (C) Solar radiation above the mean value HO (D) Surface water and ground water deficit 5. A permanent long term solution to drought problem may be found in the basic principles of (AE-73 (Special Drive) NWRWSK Advt. No. 40/2017-18) (A) Raising reservoir levels (B) Transfer of water from surplus river basins to areas of deficit. (C) Cloud seeding (D) Extracting groundwater in large quantities. 6. Average annual rainfalls in cm at 4 existing rain gauges stations in a basin are 105,79,70 and 66. If average depth of rainfall over the basin is to be estimated within 10% error then additional no. of gauges needed will be. (AE-400 NWRWSK Advt. No. 37/2017-18) (A) 1 (B) 2 (C) 3 (D) 4 7. A catchment consists of 35 % area with runoff coefficient 0.45 with the remaining 65 % area with runoff coefficient 0.55. The equivalent runoff coefficient will be (AE-400 NWRWSK Advt. No. 37/2017-18) (A) 0.505 (B) 0.515 (C) 0.500 (D) 0.450 8. According to Indian Meteorological Department, a year is considered a drought year in case the total area affected exceeds (AE-149 NWRWSK Advt. No. 38/2018-19) (A) 10% of the total area of the country (B) 20% of the total area of the country (C) 50% of the total area of the country (D) 75% of the total area of the country akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 9. The double mass curve analysis is adopted to (AE-149 NWRWSK Advt. No. 38/2018-19) (A) Estimate the missing rainfall data (B) Obtain intensities of rainfall at various duration (C) Check the consistency of data I R (D) Obtain the amount of storage needed to maintain a demand pattern S 10. The variation of rainfall between two sections in isohyetal method is assumed as A Y H (AE-149 NWRWSK Advt. No. 38/2018-19) S (A) Linear (C) Elliptical (B) parabolic (D) quadratic A K BY 11. Instruments for measuring the intensity of incoming radiation are called (A) pyrheliometers M Y (AE-149 NWRWSK Advt. No. 38/2018-19) (B) sunshine recorders (C) hygrometer D E (D) psychrometers C A A 12. A rainfall with intensity greater than 4 mm/h but less than 6.5 mm/h, referred as I C (A) Excessive rain (AE-285 R&B Advt. No. 79/2018-19) (B) Moderate rain S T (C) Light rain (D) Severe rain L I HO 13. An imaginary line joining points of equal rainfall of a particular duration with a particular return period is called (AE-285 R&B Advt. No. 79/2018-19) (A) Isopluvial (B) Isochrone (C) Isohyet (D) Isopod 14. The rainfall in three raingauge stations P, Q and R in a catchment are 6, 8 and 10 cm, respectively. The Theissen polygonal areas of these three raingauges are respectively 100, 200 and 200 km2.The average depth of rainfall over the catchment would be (AE-285 R&B Advt. No. 79/2018-19) (A) 6.5 cm (B) 8 cm (C) 8.4 cm (D) 9.2 cm 15. According to Indian Standards, the number of rain gauge stations for an area of 5,200 km2 in plains should be (AE-285 R&B Advt. No. 79/2018-19) (A) 5 (B) 10 (C) 15 (D) 20 16. Double Mass analysis is adopted to (AE-285 R&B Advt. No. 79/2018-19) (A) Estimate the missing rainfall data (B) Obtain intensities of rainfall at various duration (C) Check the consistency of the data (D) Estimate the reservoir capacity 17. Which of the following is a non-recording rain gauge? (GES-49 R&B Advt. No. 113/2018-19) (A) Tipping bucket type rain gauge (B) Simon’s rain gauge (C) Floating type rain gauge (D) Weighing type rain gauge akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 18. As per Indian Standards, in predominantly hilly areas with heavy rainfall, there should be 1 rain gauge station per km2 (GES-49 R&B Advt. No. 113/2018-19) (A) 520 (B) 330 (C) 130 (D) 30 I R 19. Which of the following statement(s) is/are correct? (GES-49 R&B Advt. No. 113/2018-19) S A Y (i) Normal ratio method is used for estimating missing annual precipitation value at a station when H theannual precipitation and normal annual precipitation at neighboring stations are known S Polygon method A K (ii) Arithmetic average method of calculating the average precipitation is superior to Thiessen- BY (iii) Isohyetal method of calculating average rainfall is superior to arithmetic average method and Thiessen-Polygon method (A) (i) and (ii) (C) (ii) and (iii) M Y (B) (i) and (iii) (D) (i), (ii) and (iii) D E A 20.The precipitation which is caused by lifting of an air mass due to pressure difference is called C A (GES-49 R&B Advt. No. 113/2018-19) I C (A) Natural Precipitation (C) Convective Precipitation (B) Organic Precipitation (D) Cyclonic Precipitation S T I 21. _____ plays an important part in completion of the hydrological cycle L HO (AE-350 NWRWSK Advt. No. 32/2019-20) (A) Coriolis Force (B) Frictional Force (C) Buoyant Force (D) Air-Resistance Force 22. The total volume of water on Earth is estimated around (AE-350 NWRWSK Advt. No. 32/2019-20) (A) 1.386 billion km³ (B) 13.86 billion km³ (C) 138.6 billion km³ (D) 1386 billion km³ 23. ___ is used to determine the reservoir capacity required to produce a yield equal to the average discharge of the stream (AE-350 NWRWSK Advt. No. 32/2019-20) (A) Mass Curve (B) Double Mass Curve (C) Hydrograph (D) Hyetograph 24. Rainfall in a catchment is a function of time (t) and represented as P = 9𝑡 3 + 5𝑡 2 Here; ‘t’ is time in hours and ‘P’ is rainfall in mm. The intensity of rainfall in the catchment for 1.5 hours storm would be (GES-28 GWSSB Advt. No. 41/2020-21) (A) 7.6 cm/hr (B) 7.6 mm/hr (C) 4.7 cm/hr (D) 4.7 mm/hr 25. Which of the following non-recording type of rain gauge measurement system has collection diameter of 127 mm? (GES-28 GWSSB Advt. No. 41/2020-21) (A) Tipping Bucket type rain gauge (B) Float type rain gauge (C) Symons rain gauge (D) Weighing bucket type rain gauge akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 26. If the probability of occurrence of a drought at a place is more than 40%, then such an area is called (GES-28 GWSSB Advt. No. 41/2020-21) (A) Drought prone area (B) Severely drought prone area (C) Acutely drought prone area (D) Chronically drought prone area I R 27. In a town there are two rain gauge stations X and Y. The rainfall data on stations X and Y in two S A Y consecutive years is 10 cm, 10 cm; and 100 cm, 100 cm, respectively. The coefficient of correlation between these two stations is H (GES-61 NWRWSK Advt. No. 71/2020-21) S (A) 0.50 (C) 1.00 (B) Indeterminate (D) Infinite A K BY 28. Mass Curve Method is used to understand the balancing storage capacity of distribution reservoirs. The Mass Curve is drawn based on: (A) Inflow only M Y (GES-61 NWRWSK Advt. No. 71/2020-21) (B) outflow only (C) Inflow and outflow D E (D) inflow, outflow and population C A A 29. Which is the odd one in the following? (AE-4 GMC Advt. No. 86/2020-21) (A) Snow (C) Rain I C (B) Sleet (D) Hail S T I 30. The nearest object from a rain gauge should be at a minimum distance equal to L HO (AE-4 GMC Advt. No. 86/2020-21) (A) its height (B) twice its height (C) thrice its height (D) four times its height 31. The most accurate method of finding the average depth of rainfall over an area is (AE-4 GMC Advt. No. 86/2020-21) (A) Isohyetal method (B) Arithmetic mean method (C) Thiessen Polygon method (D) Double mass curve method 32. Flow mass curve is the graph drawn between (AE-4 GMC Advt. No. 86/2020-21) (A) Flow rate and time (B) Cumulative volume of flow and time (C) Cumulative volume of flow and cumulative time (D) Cumulative discharge and time 33. A 60% index of wetness means (AE-4 GMC Advt. No. 86/2020-21) (A) rain excess of 40% (B) rain deficiency of 40% (C) rain deficiency of 60 % (D) None of the above Answer key 34. The ratio of actual rainfall in a year at a place to the normal annual rainfall of that place is called (AE-165 NWRWSK Advt.No.120/2020-21) (A) Rainfall coefficient (B) Index of wetness (C) Runoff coefficient (D) Degree of precipitation akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 35. The typical characteristics of convective showers is that they are of (AE-165 NWRWSK Advt.No.120/2020-21) (A) High intensity and long duration (B) High intensity and short duration (C) Low intensity and long duration (D) Low intensity and short duration I R S 36. Equivalent moisture is the water retained by a saturated soil after being centrifuged by a centrifugal force of times that of gravity A Y (AE-165 NWRWSK Advt.No.120/2020-21) (A) 10 (B) 100 S H (C) 1000 (D) 10000 A K BY 37. According to recommendations of IS: 4987–1968, how many rain gauges would be required for 1170 square kilometer hilly area? (AE-125 GWSSB Advt. No. 1/2021-22) (A) 6 (C) 9 M Y (B) 7 (D) None of above D E A 38. ____ is caused by air masses which strikes some natural topographic barrier like mountains and cannot C A move forward and hence rise up, causing condensation and precipitation. I C (A) Orographic precipitation (AE-119 NWRWSK Advt. No. 15/2021-22) (B) Cyclonic precipitation S T (C) Convective precipitation (D) None of the above L I HO 39. Which of the statements are true for Recording type Rain gauge (DEE-3 GMC Advt. No. 38/2021-22) (i) it produces a record of cumulative rain v/s time which is know an mass curve of rain fall (ii) They are also known as integrating rain gauges (A) Only (i) (B) Only (ii) (C) Both (i) and (ii) (D) Neither (i) nor (iii) 40. Index of wetness of a place is the ratio of (DEE-3 GMC Advt. No. 38/2021-22) (A) Actual rainfall in a given year in that place to the normal rainfall of that place (B) Maximum rainfall in that place in a given year to the normal rainfall of that place (C) Minimum rainfall in that place in a given year to the normal rainfall of that place (D) Amount of water vapor in the air to the maximum amount of water vapor the air can hold at the sametemperature. 41. The most accurate method for estimating mean rainfall over a catchment area is (JE (CIVIL) PGVCL 2022) (A) Arithmetic mean method (B) Thiessen's Polygon method (C) Isohyetal method (D) Unit hydrograph method 42. If the total accumulated precipitation is plotted against time, the curve obtained is known as (JE (CIVIL) PGVCL 2022) (A) Mass Curve (B) Inflow Curve (C) Hydrograph (D) Outflow Curve akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 43. If the allowable percentage error in the estimate of basic rainfall is E and coefficient of variation of rainfall is C, then the optimum number of rain gauges is given by (AAE-14 GMC Advt. No. 96/2020-21) (A) 𝐶𝑉 (B) √𝐶𝑉 I R (C) 𝐸 𝐶𝑉 ( 𝐸 )2 (D) 𝐸 𝐶𝑉 ( 𝐸 )3/2 S A Y 44. The method used for estimating missing rainfall is S H (A) Normal ratio method (B) Station year method A K (AE-350 NWRWSK Advt. No. 101/2016-17) BY (C) Plotting position method (D) Rational method Y 45. How many additional rain gauges are required in a catchment, if the error allowed in estimation of M D E mean rainfall is to be reduced by half than the present one? (AE-350 NWRWSK Advt. No. 101/2016-17) (A) Equal to the present number C A (B) Twice the present number A (C) Thrice the present number (D) Four times the present number I C 46. The double mass curve is used to (AE-350 NWRWSK Advt. No. 101/2016-17) S T (A) check the consistency of rain gauge records I (B) determine the reservoir capacity L HO (C) determine the number of rain gauges required (D) determine the maximum probable precipitation 47. An accurate estimate of average rainfall in a particular catchment area can be obtained by (AE-100 NWRWSK Advt. No. 06/2022-23) (A) Normal ratio method (B) Rebound hammer method (C) Isohyetal method (D) Thiessen method 48. The precipitation in the form of water drops of size larger than 0.5 mm is known as (GES-28 GWSSB Advt. No. 24/2022-23) (A) Drizzle (B) Glaze (C) Rain (D) Snow 49. An isohyet is a line joining points having (GES-28 GWSSB Advt. No. 24/2022-23) (A) Equal evaporation value (B) Equal barometric pressure (C) Equal height above the MSL (D) Equal rainfall depth in a given duration 50. The standard Symons type rain gauge has a collecting area of diameter (GES-28 GWSSB Advt. No. 24/2022-23) (A) 12.7 cm (B) 10 cm (C) 5.08 cm (D) 25.4 cm 51. The commonly used rain gauge is (GES-28 GWSSB Advt. No. 24/2022-23) (A) weighing bucket type (B) tipping bucket type (C) float type (D) none of the above akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 52. The precipitation which is caused by lifting of an air mass due to the pressure difference is called (GES-28 GWSSB Advt. No. 24/2022-23) (A) Natural Precipitation (B) Organic Precipitation (C) Convective Precipitation (D) Cyclonic Precipitation I R S 53. Most of the rainfall in India comes though as A Y (GES-58 R&B & NWRWSK Advt. No. 19/2022-23) (A) frontal cyclonic precipitation H (B) non-frontal cyclonic precipitation S (C) convective precipitation K (D) orographic precipitation A 54. A line joining places of equal rainfall is called BY (GES-58 R&B & NWRWSK Advt. No. 19/2022-23) (A) isohyet M Y (B) isobar (C) isotherm D E (D) isopleths C A 55. Which of the following statements are true for Double Mass Curves (DMC)? A (GES-58 R&B & NWRWSK Advt. No. 19/2022-23) I C i. DMC is used to check the consistency of many of hydrologic data by comparing data for a single station with that of a pattern composed of the data from several other stations in the area. S T ii. DMC cannot be used to adjust the inconsistent precipition data I iii. DMC is used for estimating the infiltration pattern of a given area L HO (A) only (i) (B) (i) and (ii) (C) (ii) and (iii) (D) (i),(ii) and (iii) 56. Find the optimum number of rain gauge stations required if the coefficient of variation of the rainfall for the 5 rain gauge stations in the catchment was found to be 25% while the admissible error is 5%. (GES-58 R&B & NWRWSK Advt. No. 19/2022-23) (A) 10 (B) 15 (C) 20 (D) 25 57. Which is incorrect in case of the methods used for measurement of average rainfall? (AE-125 GWSSB Advt. No. 26/2022-23) (A) Isohyetal method is used for hilly area (B) Theissen polygon method is used for hilly area (C) Theissen polygon method is used for plain area (D) Theissen polygon method is used when gauging stations are less akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 Ans key 1 C 26 D 51 C I R 2 A 27 C 52 D S 3 C 28 C 53 D A Y 4 D 29 C 54 A SH 5 6 B A 30 31 B A 55 56 A D A K 7 8 B B 32 33 B B 57 B BY 9 C 34 B M Y 10 A 35 B D E 11 A 36 C C A 12 B 37 AC 13 A 38 I C A 14 C S T 39 C 15 L IB 40 A HO 16 C 41 C 17 B 42 A 18 C 43 C 19 B 44 A 20 D 45 C 21 A 46 A 22 A 47 C 23 A 48 C 24 A 49 D 25 C 50 A akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 Chapter- 02 Evaporation, Transpiration and Stream flow measurement 1. Echo sounder is used to measure (GES-245 R&B & NWRWSK ADVT. NO. 39/2017-18) I R (A) Width of river (C) Depth of river (B) Velocity of river (D) Length of river S A Y H 2. If sufficient moisture is always available to completely meet the needs of vegetation fully covering the S area, the resulting evapotranspiration is called A K (GES-245 R&B & NWRWSK ADVT. NO. 39/2017-18) BY (A) Potential evapotranspiration (B) Actual evapotranspiration (C) Consumptive evapotranspiration (D) Direct evapotranspiration 3. A lysimeter is used to measure M Y E AD (GES-245 R&B & NWRWSK ADVT. NO. 39/2017-18) AC (A) Infiltration (B) Evaporation (C) Evapotranspiration (D) Radiation I C 4. In a dilution technique of stream flow measurement, which of the following chemicals is used? S T (AE-73 (Special Drive) NWRWSK Advt. No. 40/2017-18) L I (A) Common salt (B) Alum HO (C) Sodium hexa-meta phosphate (D) Diluted HCL 5. Which of the following chemical is suitable to be used as a water evaporation inhibitor (AE-149 NWRWSK Advt. No. 38/2018-19) (A) Cetyl alcohol (B) butyl alcohol (C) Methyl alcohol (D) ethyl alcohol 6. Under the same conditions, which of the following shapes of water surface will give the highest rateof evaporation? (AE-149 NWRWSK Advt. No. 38/2018-19) (A) Flat water surface (B) convex water surface (C) Concave water surface (D) evaporation is independent of shape of water surface 7. Calibration of a current meter for use in channel flow measurement is done in a (AE-149 NWRWSK Advt. No. 38/2018-19) (A) wind tunnel (B) water tunnel (C) towing tank (D) flume 8. The instrument used for measuring evaporation is: (GES -49 R&B ADVT NO. 113/2018-19) (A) Hygrometer (B) atmometer (C) lysimeter (D) luxmeter 9. The evaporation losses from the surface of a reservoir can be reduced by sprinkling (GES-49 R&B ADVT NO. 113/2018-19) (A) Cetyl alcohol (B) Methyl alcohol (C) Chlorine (D) Alum akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 10. Pygmy water current meter is used for stream-flow measurements (AE-350 NWRWSK Advt. No. 32/2019-20) (A) In shallow streams, flumes and small channels, where the velocity of water does not exceed 1m/sec. (B) In rivers and big channels, where the velocity of water does not exceed 1m/sec. I R S (C) In shallow streams, flumes and small channels, where the velocity of water exceeds 1m/sec. (D) In rivers and big channels, where the velocity of water exceeds 1m/sec. A Y H 11. Which of the following is not a direct method of discharge measurement in a stream? S (A) Velocity area method using current meter A K (AE-350 NWRWSK Advt. No. 32/2019-20) (B) Velocity area methods using floats BY (C) Dilution method (D) Slope area method 12. A station rating curve is a graph of M Y (AE-350 NWRWSK Advt. No. 32/2019-20) (A) Discharge versus stage for a given point on a stream, usually at the gauging station D E (B) Velocity versus stage for a given point on a stream, usually at the gauging station C A (C) Discharge versus velocity for a given point on a stream, usually at the gauging A (D) Gauge height versus critical velocity of a stream, usually at the gauging station I C 13. Rivers which flow only for a short time after a rainstorm and for rest of the time (usually most of the S T time) their beds are dry are called (AE-350 NWRWSK Advt. No. 32/2019-20) L I (A) Intermittent Rivers (B) Ephemeral Rivers HO (C) Gaining Rivers (D) Losing Rivers 14. The Western Ghats of India experiences precipitation of 200 cm. The corresponding runoff by using Inglis formula is (GES-61 NWRWSK Advt. No. 71/2020-21) (A) 121.5 cm (B) 139.5 cm (C) 148 cm (D) 111.8 cm 15. Which of the following factor(s) does not affect losses occurred due to transpiration effect (GES-61 NWRWSK Advt. No. 71/2020-21) (i) Ground water table. (ii) Moisture content of soil. (iii) Type of leaf structure (iv) Wind speed. (A) Only (i) (B) Only (ii) (C) (i), (ii) and (iii) (D) (iii) and (iv) 16. The number of revolutions of a current meter in 60 seconds was found to be 12 and 30 corresponding to the velocities of 0.20 and 0.35 m/s, respectively. What velocity would be indicated by50 revolutions of that current meter in 50 seconds? (GES-61 NWRWSK Advt. No. 71/2020-21) (A) 0.3 m/s (B) 0.5 m/s (C) 0.6 m/s (D) None of above 17. The science which deals with the surface streams is known as (AE-4 GMC Advt. No. 86/2020-21) (A) Limnology (B) Potamology (C) Cryology (D) Geomorphology akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 18. The ratio of the radiation reflected back by a surface to the radiation received by it is called as (AE-4 GMC Advt. No. 86/2020-21) (A) Radiation coefficient (B) absorption coefficient (C) albedo (D) luminosity I R 19. The instrument which measures the variation of humidity with time is called S (AE-4 GMC Advt. No. 86/2020-21) (A) Hygrometer (B) Hydrometer A Y (C) Thermohydrometer (D) Thermohygrometer S H 20. Pyranometer is the instrument which measures A K (AE-4 GMC Advt. No. 86/2020-21) BY (i) shortwave radiation (ii) Longwave radiation (iii) Albedo (A) Only (i) M Y (B) (i) and (ii) (C) (ii) and (iii) D E (D) (i), (ii) and (iii) C A 21. Atmometer is used to measure A (AE-4 GMC Advt. No. 86/2020-21) (A) Evaporation I C (C) evapotranspiration (B) transpiration (D) infiltration S T L I 22. Humidity can be measured by (AE-165 NWRWSK Advt.No.120/2020-21) HO (A) Psychrometer (B) hygrometer (C) Both (A) and (B) (D) Neither (A) nor (B) 23. The graph produced by an instrument which measures the variation of atmospheric temperature with time is called (AE-165 NWRWSK Advt.No.120/2020-21) (A) Thermograph (B) Hydrograph (C) Seismograph (D) Thermohydrograph 24. Evaporation is determined experimentally using (AE-350 NWRWSK Advt. No. 101/2016-17) (A) An open pan (B) A neutron probe (C) A lysimeter (D) An infiltrometer 25. Atmometer is used to measure (AE-350 NWRWSK Advt. No. 101/2016-17) (A) evaporation (B) transpiration (C) evapotranspiration (D) all of the above 26. A Lysimeter is used to measure (AE-100 NWRWSK Advt. No. 06/2022-23) (A) Infiltration (B) Evaporation (C) Evapotranspiration (D) Radiation 27. Humidity is measured by (AE-100 NWRWSK Advt. No. 06/2022-23) (A) hydrometer (B) seismometer (C) hygrometer (D) anemometer akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 28. Which of the following factors have to be considered in selecting a site for a stream gauging station? (GES-28 GWSSB Advt. No. 24/2022-23) (A) The section should be straight and uniform for a length of about 10 to 20 times the width of the stream. I R (B) The bed and banks should be free from vegetal growth (C) There should be no longer overflow section at flood stage. S (D) All of the above A Y S H 29.Thermohygrograph gives a continuous record of A K (GES-58 R&B & NWRWSK Advt. No. 19/2022-23) BY i. temperature ii. relative humidity iii. Solar radiation (A) only (i) M Y (B) (i) and (ii) (C) (ii) and (iii) D E (D) (i),(ii) and (iii) C A 30. Transpiration is measured by (A) lysimeter A (GES-58 R&B & NWRWSK Advt. No. 19/2022-23) (B) pyranometer (C) phytometer T IC (D) hygrometer I S 31. The transpiration ratio is the ratio of O L (GES-58 R&B & NWRWSK Advt. No. 19/2022-23) H (A) the mass of water transpired to the mass of dry matter produced (B) the mass of water transpired to mass of living matter produced (C) the mass of water transpired to the mass of water uptake (D) the mass of water given to the mass of water retained akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 Ans Key 1 C I R 2 A S 3 C A Y 4 A SH 5 6 A B A K 7 8 C B BY 9 A M Y 10 A D E 11 D C A 12 A A 13 B I C 14 B S T 15 L I A HO 16 C 17 B 18 C 19 A 20 A 21 A 22 C 23 A 24 A 25 A 26 C 27 C 28 D 29 B 30 C 31 A akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 Chapter-3 Flood and Infiltration 1. Hyetograph is a plot of I R (GES-245 R&B & NWRWSK ADVT. NO. 39/2017-18) (A) Cumulative rainfall v/s time (B) Rainfall intensity v/s time S (C) Rainfall depth v/s time (D) Discharge v/s time A Y S H A K 2. The relation between probability (P) and recurrence interval (T) is given by (GES-245 R&B & NWRWSK ADVT. NO. 39/2017-18) BY (A) PT = 1 (B) PT2 = 1 (C) P/T = 1 (D) P/T2 = 1 3. Hyetograph is a plot of M Y (AE-73 (Special Drive) NWRWSK Advt. No. 40/2017-18) E AD (A) Accumulated rainfall vs. time (B) Rainfall intensity vs. time (C) Runoff vs. time (D) Infiltration intensity vs. time AC I C 4. If the maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years, then probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by T IS (AE-400 NWRWSK Advt. No. 37/2017-18) (A)(0.99)10 (B) 1 – (0.99)10 O L (C) (0.9)100 (D) 1 – (0.9)100 H 5. The vertical hydraulic conductivity of the top soil at certain stage is 0.2 cm/hr. A storm of intensity 0.5 cm/h occurs over the soil for an indefinite period. Assuming the surface drainage to be adequate, theinfiltration rate after the storm has lasted for a very long time shall be (AE-400 NWRWSK Advt. No. 37/2017-18) (A) < 0.2 cm/hr (B) 0.2 cm/hr (C) Between 0.2 and 0.5 cm/hr (D) 0.5 cm/hr 6. The live storage requirement for a reservoir is to be determined by (AE-149 NWRWSK Advt. No. 38/2018-19) (A) Topographical survey (B) annual demand (C) Double mass curve analysis (D) mass curve analysis 7. Kirpich’s equation is used to determine which one of the following? (AE-149 NWRWSK Advt. No. 38/2018-19) (A) Run-off from a given rainfall (B) Base time of a unit hydrograph (C) Time of concentration in run-off hydrograph (D) Peak flow 8. A 6-h storm has 10 cm of rainfall and the resulting runoff was 4 cm. For the same infiltration index, what would be the runoff for a 12-hour storm having a rainfall of 16 cm? (AE-285 R&B Advt. No. 79/2018-19) (A) 4 cm (B) 6 cm (C) 3 cm (D) None of the above akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 9. Time of concentration is the (GES-49 R&B Advt. No. 113/2018-19) (A) Time of maximum possible precipitation that may concentrate and fall over a given basin. (B) Time taken by the rain water to flow to an existing defined drain in a basin. (C) Time for which the rain water remains concentrated on the basin. I R (D) Maximum time taken by the rain water to reach the outlet of the basin. S A Y 10. The earthen embankments constructed parallel to the river at some suitable distances for flood protection are called H (GES-49 R&B Advt. No. 113/2018-19) S (A) Guide banks (C) Terraces (B) Levees (D) Groynes A K BY 11. Which of the following is not true pertaining to the Rational method for determining the peak discharge from drainage basin run off? M Y (GES-49 R&B Advt. No. 113/2018-19) (A) Runoff coefficient is multiplied with the intensity of rainfall D E (B) Runoff coefficient is multiplied with the drainage area A (C) Drainage area is multiplied with the intensity of rainfall C A (D) Intensity of rainfall is multiplied with runoff I C 12. A 4-hr storm had 4 cm of rainfall and the resulting direct runoff was 2.0 cm. If the -index remains at S T the same value, the runoff due to 10 cm of rainfall in 8 hour in the catchment will be L I (GES-49 R&B Advt. No. 113/2018-19) HO (A) 4.0 cm (B) 6.0 cm (C) 7.5 cm (D) 8.0 cm 13. The probability of a 10-year flood to occur at least once in next 2 years is (GES-49 R&B Advt. No. 113/2018-19) (A) 9% (B) 19% (C) 29% (D) 39% 14. A flood of certain magnitude has a return period of 25 years. The probability of exceedance is (AE-350 NWRWSK Advt. No. 32/2019-20) (A) 4% (B) 12% (C) 16% (D) 32% 15. A 1-day rainfall of 13 cm was found at a particular place with a return period of 20 years. The probability that a 1-day rainfall of this or larger magnitude will occur at least once in next 1 year would be (GES-28 GWSSB Advt. No. 41/2020-21) (A) 1/10 (B) 1/20 (C) 1/100 (D) 1/200 16. The rainfall on three successive 4-h periods is respectively 1.5, 5.0 and 3.5 cm. If the surface runoff resulting from this storm is 2.5 cm, then x-index (in cm/h) for this storm would be (GES-28 GWSSB Advt. No. 41/2020-21) (A) 0.550 cm/hr (B) 0.625 cm/hr (C) 0.675 cm/hr (D) 0.750 cm/hr akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 17. A catchment of area 500 hectares has a runoff coefficient of 0.5. A storm of duration larger than the time of concentration of the catchment and of intensity 3.6 cm/h causes a peak discharge of (GES-28 GWSSB Advt. No. 41/2020-21) (A) 5 𝑚3 /s (C) 25 𝑚3 /s (B) 10 𝑚3 /s (D) 50 𝑚3 /s I R S A Y 18. If the intensity of rainfall is less than the infiltration capacity of the soil, then the infiltration ratewill be H (GES-28 GWSSB Advt. No. 41/2020-21) S (A) Equal to the rainfall intensity (B) Equal to the infiltration capacity A K BY (C) More than the rainfall intensity but less than the infiltration capacity (D) More than the infiltration capacity but less than the rainfall intensity M Y 19. From the analysis of rainfall data at particular station was found that a rainfall of 400 mm had a return D E period of 2 years. What is the probability of rainfall equal to or greater than 500 mm at least oncein 10 successive years? C A (GES-61 NWRWSK Advt. No. 71/2020-21) (A) Zero (C) Approx. 90% A (B) Approx. 50% (D) Approx. 100% I C S T 20. At a particular place during a flood frequency analysis, the probability of happening of rainfall is found I to be 90% with value of variate as 0.834. For infinite sample size, what would be the Gumbel’s L HO frequency factor? (GES-61 NWRWSK Advt. No. 71/2020-21) (A) 0.05 (B) 0.20 (C) 0.32 (D) 0.41 21. Flood frequency studies are more reliable when (GES-61 NWRWSK Advt. No. 71/2020-21) (A) Length of record of meteorological observations is less than 10 years (B) Length of record of meteorological observations is less than 20 years but more than 10 years (C) Yearly variation in climate is not uniform (D) Variation in climate is uniform year to year 22. If a 6-hour storm with hourly intensities of 7, 18, 25, 12, 10 and 3 mm/h produced a runoff of 33 mm, then the x-index is (AE-4 GMC Advt. No. 86/2020-21) (A) 3 mm/h (B) 7 mm/h (C) 8 mm/h (D) 10 mm/h 23. The most commonly used probability distribution to fit the flood data is the (AE-4 GMC Advt. No. 86/2020-21) (A) Normal distribution (B) Gumbel’s extreme value distribution (C) Log-Normal distribution (D) Gamma distribution 24. Average filtration rate Windex of an area is given by where P = Total precipitation, Q=Total runoff, tr = duration of rainfall in hours (AE-165 NWRWSK Advt.No.120/2020-21) (A) (P-Q) / tr (B) (P+Q) / tr (C) P/ tr (D) Q/ tr akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 25. Infiltration rate is always (AE-165 NWRWSK Advt.No.120/2020-21) (A) more than the infiltration capacity (B) less than the infiltration capacity (C) Equal to or less than the infiltration capacity I R (D) Equal to or more than the infiltration capacity S 26. The theory of infiltration capacity was evolved by A Y H (AE-165 NWRWSK Advt.No.120/2020-21) S (A) W. W. Horner (C) M. Bernard (B) L. K. Sherman (D) R. E. Horton A K BY 27. The portion of water which penetrates into the interstices of the soil and eventually becoming a part of the ground water, is (A) Run off M Y(B) Evaporation (JE (CIVIL) GETCO- 2022) (C) Percolation D E (D) Transpiration C A A 28. Which of the following is Ryve’s formula, to be used for flood estimation (A) Q = C × 𝑀 I C 2/3 (AE-350 NWRWSK Advt. No. 101/2016-17) (B) Q = C × 𝑀3/4 S (C) Q = C × 𝑀T 𝑛 (D) Q = C × 𝑀1/2 L I HO 29. Infiltration capacity (AE-350 NWRWSK Advt. No. 101/2016-17) (A) is constant factor (B) changes with time (C) changes with location (D) changes with time and location 30. The rate of rainfall above which the rainfall volume equals the runoff volume is called (AE-350 NWRWSK Advt. No. 101/2016-17) (A) W index (B) φ Index (C) Runoff coefficient (D) Basin recharge 31. The percentage chance of a flood with 100 year frequency of not occurring in coming 100 years is (AE-350 NWRWSK Advt. No. 101/2016-17) (A) 36.6% (B) 63.4% (C) 100.0% (D) None of the above 32. Which variation is shown by the rainfall hyetograph? (AE-100 NWRWSK Advt. No. 06/2022-23) (A) Rainfall area with volume (B) Rainfall intensity with time (C) Rainfall depth with area (D) Rainfall intensity cumulative with depth akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 33. A conventional flow duration curve is a plot between (AE-100 NWRWSK Advt. No. 06/2022-23) (A) Flow and percentage of time that a particular flow is equalled or exceeded (B) Duration of flooding and ground level elevation I R S (C) Duration of water supply in a city and proportion of area receiving supply exceeding this duration (D) Flow rate and duration of time taken to empty a reservoir at that flow rate A Y S 34. According to Fanning’s formula, the flood discharge (Q) in cumecs is given by H A K (GES-28 GWSSB Advt. No. 24/2022-23) BY 2/3 (A) Q=𝐶𝐴 (B) Q=𝐶𝐴3/4 (C) Q=𝐶𝐴5/6 (D) Q=𝐶𝐴7/8 M Y 35. Area under the hyetograph represents E AD (AE-125 GWSSB Advt. No. 26/2022-23) AC (A) Total rainfall occurred in that period (B) Total runoff occurred during that period I C (C) Total infiltration occurred in that period (D) Total evapotranspiration occurred in that period S T I 36. Which statement is correct regarding flood control? L HO (AE-125 GWSSB Advt. No. 26/2022-23) i. Construction of Levees ii. Provision of flood wall iii. Prevention of diversion channels iv. Construction of storage reservoirs (A) Only (i) and (iii) are correct (B) Only (i), (ii) and (iv) are correct (C) Only (ii), (iii) and (iv) are correct (D) Only (ii) and (iii) are correct akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 Ans Key 1 B 26 D 2 A 27 C I R 3 B 28 A S 4 5 B B 29 30 D B A Y 6 D 31 A SH 7 C 32 B A K BY 8 A 33 A 9 D 34 C 10 B 35 A M Y 11 D 36 B DE 12 B C A 13 B A 14 15 A B I C 16 DS T 17 L IC HO18 19 A D 20 B 21 D 22 C 23 B 24 A 25 C akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 Chapter-4 Hydrograph 1. Base flow separation is used in connection with I R (A) Seepage flow (GES-245 R&B & NWRWSK ADVT. NO. 39/2017-18) (B) Infiltration S (C) Evaporation (D) Stream flow A Y S H 2. The theory of Unit Hydrograph was propounded by A K (GES-245 R&B & NWRWSK ADVT. NO. 39/2017-18) BY (A) L. K. Sherman (B) A. N. Khosla (C) L. Prandtl (D) C. Inglis 3. Maximum surface run-off is because of M Y E AD (GES-245 R&B & NWRWSK ADVT. NO. 39/2017-18) (A) A flash storm (B) Leaf shaped catchment AC (C) Improved land management (D) Presence of forest area I C 4. The statement “ordinate of the direct run off hydrographs of a common base period are directly T proportional to the volumes of runoff represented by the respective hydrograph” infers S L I (AE-400 NWRWSK Advt. No. 37/2017-18) HO (A) Principle of linearity (B) principle of time invariance (C) Principle of uniformity (D) none of these 5. In order to prepare 2 hour unit hydrograph from a hour unit hydrograph which of the following method will be applied? (AE-400 NWRWSK Advt. No. 37/2017-18) (A) Synthetic unit hydrograph (B) S- curved method (C) Instantaneous unit hydrograph (D) Simple unit method 6. When the outflow from a storage reservoir is uncontrolled as in a freely operating spillway, the peak of outflow hydrograph occurs at (AE-149 NWRWSK Advt. No. 38/2018-19) (A) The point of intersection of the inflow and outflow hydrographs (B) A point after the intersection of the inflow and outflow hydrographs (C) The tail of inflow hydrograph (D) A point before the intersection of the inflow and outflow hydrographs 7. Runoff increases with (AE-149 NWRWSK Advt. No. 38/2018-19) (A) Increase in the infiltration capacity (B) increase in intensity of rain (C) Increase in permeability of soil (D) decrease in the porosity of soil 8. Drainage density is the (AE-149 NWRWSK Advt. No. 38/2018-19) (A) Average length of the streams per unit drainage area within the basin (B) Stream discharge per unit drainage area (C) Annual runoff per unit drainage area (D) Number of streams per unit drainage area akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 9. The basic assumptions of the unit hydrograph theory are (AE-149 NWRWSK Advt. No. 38/2018-19) (A) Nonlinear response and time invariance (B) Time invariance and linear response I R (C) Linear response and linear time variance (D) Nonlinear time variance and linear response S A Y H 10. The use of the unit hydrograph for estimating floods is limited to catchments of size less than S (A) 50 𝑘𝑚2 (B) 500 𝑘𝑚2 A K (AE-149 NWRWSK Advt. No. 38/2018-19) BY (C) 5,000 𝑘𝑚2 (D) 50,000 𝑘𝑚2 11. The drainage density is expressed as M Y (AE-285 R&B Advt. No. 79/2018-19) (A) Ratio of shortest length of channel to the total drainage area D E (B) Ratio of total drainage area to the total channel length C A (C) Ratio of total channel length to the total drainage area A (D) Ratio of longest length of channel to the total drainage area I C 12.The direct runoff hydrograph of a storm obtained from a catchment is triangular in shape with a base T width of 400 hours. The peak flow rate is 50 𝑚3 /s. If the catchment area is 300 km2, then what would S L I be the effective rainfall? (AE-285 R&B Advt. No. 79/2018-19) HO (A) 9 cm (B) 6 cm (C) 14 cm (D) 12 cm 13. A plot between rainfall-intensity versus time is called (GES-49 R&B Advt. No. 113/2018-19) (A) Isohyet (B) Mass curve (C) Hyetograph (D) Hydrograph 14. A 3-hour storm hydrograph has 7 units of direct runoff. The 3-hour unit hydrograph for this storm can be obtained by dividing the ordinates of the storm hydrograph by (GES-49 R&B Advt. No. 113/2018-19) (A) 3 (B) 7 (C) 3/7 (D) 7/3 15. A unit hydrograph for a watershed is triangular in share with base period of 20 hours. The area of watershed is 500 ha. What is the peak discharge in 𝑚3 /hr? (GES-49 R&B Advt. No. 113/2018-19) (A) 4000 (B) 5000 (C) 6000 (D) 7000 16. The pattern which involves irregular branching of tributary stream in many directions and at almost any angle in the drainage basin is called (AE-350 NWRWSK Advt. No. 32/2019-20) (A) Rectangular (B) Angulate (C) Trellis (D) Dendritic akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 17. Theory of unit hydrograph has application in (GES-28 GWSSB Advt. No. 41/2020-21) (i) Flood forecasting by using very short data. (ii) Checking the reliability of flows obtained by using statistical methods. R (iii) Representing the snow-melt runoff. Considering the above, which of the following is the I correct option? (A) Only (i) (B) (i) and (iii) S (C) (ii) and (iii) (D) (i) and (ii) A Y S H 18. L. K. Sherman propounded the theory for (A) Exit gradient (B) Regime canal A K (GES-28 GWSSB Advt. No. 41/2020-21) BY (C) Unit hydrograph (D) Boundary Layer M Y 19. Synthetic unit hydrograph developed by Synder is valid for a basin up to (GES-61 NWRWSK Advt. No. 71/2020-21) (A) 100 𝑚𝑖𝑙𝑒𝑠 2 D E (B) 1000 𝑚𝑖𝑙𝑒𝑠 2 (C) 5000 𝑚𝑖𝑙𝑒𝑠 2 C A (D) 10000 𝑚𝑖𝑙𝑒𝑠 2 A I C 20. The shape of the basin can be quantified by (i) Elongation Ratio (AE-4 GMC Advt. No. 86/2020-21) S T (ii) Circularity Ratio I (iii) Form Factor L HO (iv) Compactness Coefficient (A) (i) and (ii) (B) (iii) and (iv) (C) (ii), (iii) and (iv) (D) (i), (ii), (iii) and (iv) 21. The S-curve hydrograph is used to (AE-4 GMC Advt. No. 86/2020-21) (A) Estimate the peak flood flow of a basin resulting from a given storm (B) Develop synthetic unit hydrograph (C) Convert the unit hydrograph of any given duration into a unit hydrograph of any other desiredduration (D) Derive the unit hydrograph from complex storms 22. The basic principles of unit hygrograph theory are (AE-4 GMC Advt. No. 86/2020-21) (A) Linearity and time invariance (B) Nonlinearity and time invariance (C) Nonlinear time variance and linearity (D) Nonlinear time variance and nonlinearity 23. The concept of unit hydrograph was first introduced by (AE-4 GMC Advt. No. 86/2020-21) (A) Dalton (B) Sherman (C) Snyder (D) Thiessen 24. The word ‘unit’ in the unit hydrograph refers to (AE-4 GMC Advt. No. 86/2020-21) (A) Unit depth of runoff (B) unit duration of the storm (C) Unit base period of the hydrograph (D) unit area of the basin akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 25. The portion of water which flows over the surface of ground as storm water, is (JE (CIVIL) GETCO 2022) (A) Percolation (B) Evaporation (C) Run off (D) Transpiration I R S 26. The minimum intensity of rainfall (in mm/h) from the rainfall hyetograph drawn with following data, would be A Y Time (in am) Cumulative rainfall (mm) S H 7.00 7.30 0 7 A K BY 8.00 10 8.30 20 9.00 35 M Y 9.30 10.30 45 50 D E 11.00 54 C A A (A) 5 (C) 8 T IC (B) 6 (D) Cannot be calculated I S O L 27. The basic assumption of unit-hydrograph theory is (AE-100 NWRWSK Advt. No. 06/2022-23) H (A) Linear response and linear time variance (B) Non-linear time variance and linear response (C) Time invariance and linear response (D) Non-linear response and time invariance 28. A watershed got transformed from rural to urban over a period of time. The effect of urbanization on storm runoff hydrograph from the watershed is to (AE-100 NWRWSK Advt. No. 06/2022-23) (A) decrease the volume of runoff (B) increase the time to peak discharge (C) decrease the time base (D) decrease the peak discharge 29. The word unit in the unit hydrograph refers to the (GES-28 GWSSB Advt. No. 24/2022-23) (A) Unit area of the basin (B) Unit duration of the storm (C) Unit base period of the hydrograph (D) Unit depth of runoff 30. A Unit Hydrograph has one unit of (GES-28 GWSSB Advt. No. 24/2022-23) (A) Peak Discharge (B) Rainfall Duration (C) Direct Runoff (D) None of the above akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 31. The S-curve is used to (GES-58 R&B & NWRWSK Advt. No. 19/2022-23) (A) alter a unit hydrograph of specified duration into a unit hydrograph of desired duration (B) develop a synthetic unit hydrograph I R (C) derive the unit hydrograph of a complex storm (D) estimate the peak flood flow of a basin from the given storm S A Y 32. Which is incorrect in case of unit hydrograph theory? S H (A) Unit hydrograph represents 1 cm of runoff A K (AE-125 GWSSB Advt. No. 26/2022-23) BY (B) Effective rainfall in unit hydrograph is uniformly distributed over entire area (C) Unit hydrograph theory is not applicable to large area Y (D)Unit hydrograph theory is applicable to appreciable precipitation of snow also M D E C A A I C S T L I HO akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 Ans Key 1 D 26 A 2 A 27 C 3 A 28 C I R 4 A 29 D S 5 B 30 C A Y 6 A 31 A SH 7 8 B A 32 D A K 9 10 B C BY 11 C M Y 12 D DE 13 C C A 14 B A 15 B I C 16 D S T 17 L ID HO 18 C 19 D 20 D 21 C 22 A 23 B 24 A 25 C akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 Chapter-5 Flood routing and miscellaneous topic 1. Probable maximum flood is (GES-245 R&B & NWRWSK ADVT. NO. 39/2017-18) (A) An impossibly large flood discharge (B) Largest flood that could conceivably occur at a particular location I R (C) A flood with maximum probability of occurrence (D) The maximum possible flood which is probable for that year S A Y 2. The Muskingum method of flood routing is a S H (A) Hydraulic routing method A K (AE-73 (Special Drive) NWRWSK Advt. No. 40/2017-18) (B) form of reservoir routing method (C) Hydrologic channel routing method BY Y (D) Complete numerical solution of St Venant equations M D E 3. Depth-Area-Duration curves of precipitation are drawn as C A (GES-49 R&B Advt. No. 113/2018-19) A (A) Minimizing envelopes through the appropriate data points I C (B) Maximizing envelopes through the appropriate data points (C) Best fit curves through the appropriate data points S T (D) Best fit mean straight lines through the appropriate data points L I HO 4. The design flood commonly adopted in India for barrages and minor dams is (GES-49 R&B Advt. No. 113/2018-19) (A) Probable Maximum Flood (B) a flood of 50-100 years return period (C) Peak Flood (D) Standard Project Flood or a 100-year flood (whichever is higher) 5. Standard Project Flood for the drainage area involved is the flood that (AE-350 NWRWSK Advt. No. 32/2019-20) (A) is sure to be equalled in magnitude once or more time in the estimated life of the project (B) is likely to be exceeded in magnitude only at rare occasions in the estimated life of the project (C) Might occur under the worst meteorological and hydrological conditions in the estimated life of theproject (D) Will occur under standard meteorological conditions in the estimated life of the project 6. Muskingum’s method is connected to which of the following? (AE-350 NWRWSK Advt. No. 32/2019-20) (A) Unit Hydrograph (B) Flood routing (C) Design Flood estimation (D) Infiltration capacity akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 7. Probable maximum precipitation is defined as (GES-28 GWSSB Advt. No. 41/2020-21) (A) The greatest depth of precipitation for a given duration meteorologically possible at a particularlocation at a particular time of the year (B) The greatest rainfall that is possible with the worst meteorological conditions (C) The rainfall of a given duration with maximum probability of occurrence I R (D) The rainfall for a given duration that is most unlikely to occur S A Y S H 8. Which one of the following is the most accurate method of reservoir routing? (GES-61 NWRWSK Advt. No. 71/2020-21) (A) Muskingum method (C) Newton method (B) Goodrich method A K (D) Standard fourth-order Runge-Kutta (SRK) method 9. The probable maximum flood is BY (AE-119 NWRWSK Advt. No. 15/2021-22) M Y (A) The standard project flood of an extremely large river E (B) A flood adopted in the design of all kinds of spillways D A (C) An extremely large but physically possible flood in the region C A (D) The maximum possible flood that can occur anywhere in the country I C 10. The Muskingum method of flood routing is a S T (AE-100 NWRWSK Advt. No. 06/2022-23) L I (A) Form of reservoir routing (B) Hydrological channel routing method HO (C) Form of hydraulic routing of a flood (D) Complete numerical solution of St. Venant equations 11. A linear reservoir is one in which (AE-100 NWRWSK Advt. No. 06/2022-23) (A) the volume varies linearly with elevation (B) the storage varies linearly with time (C) the storage varies linearly with the outflow rate (D) the storage varies linearly with the inflow rate 12. The Probable Maximum Flood is (GES-28 GWSSB Advt. No. 24/2022-23) (A) The standard project flood of an extremely large river (B) A Flood adopted in the design of all kinds of spillways (C) An extremely large but physically possible flood in the region (D) The maximum possible flood that can occur anywhere in the country akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 I R S A Y Ans Key SH 1 2 B C A K 3 4 B D BY 5 B M Y 6 B D E 7 A C A 8 D A 9 C I C 10 B S T 11 12 L IC C HO akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 Chapter 06- Well Hydraulic 1. Which of these does not relate to the zone of aeration in the soil profile? (GES-245 R&B & NWRWSK ADVT. NO. 39/2017-18) (A) Saturation zone (B) Capillary zone I R (C) Intermediate zone (D) Soil water zone S 2. Which of the following hydrological process has storage as well as transportation aspects A Y S (AE Special Drive ADVT. NO.40/2017-18) H (A) Precipitation (C) Runoff (B) Evaporation (D) Groundwater A K BY 3. The surface joining the static water levels in several wells penetrating a confined aquifer represents M Y (AE-73 (Special Drive) NWRWSK Advt. No. 40/2017-18) (A) water table surface D E(B) perched water table surface (C) cone of depression C A (D) piezometric surface A 4. The unit of coefficient of transmissibility is 2 (A) m /s T IC (AE-73 (Special Drive) NWRWSK Advt. No. 40/2017-18) (B) m/s S (C) unit less I (D) m/s2 O L 5. Which of the following structures is constructed for artificial recharge of groundwater? H (A) Weir with d/s inverted filters (AE-73 (Special Drive) NWRWSK Advt. No. 40/2017-18) (B) Percolation Tank (C) Infiltration Gallery (D) Escape 6.Which of the following methods is used in subsurface investigation of GW? (AE-73 (Special Drive) NWRWSK Advt. No. 40/2017-18) (A) Standard penetration test (B) Air surging and pumping method (C) Resistivity logging method (D) Cathodic Protection Method 7. If the porosity of an aquifer material is 0.80 and specific retention is 0.30, then the ratio of specificretention to specific yield would be (AE-285 R&B Advt. No. 79/2018-19) (A) 1.93 (B) 0.85 (C) 1.67 (D) 0.60 8. Specific storage refers to (GES-49 R&B Advt. No. 113/2018-19) (A) Volume of water stored in the unit volume of aquifer (B) Water that a portion of an aquifer releases from storage, per unit mass or volume of aquifer, per unit change in hydraulic head, while remaining fully saturated. (C) Volume of water drained by gravity per unit volume of aquifer (D) The difference between field capacity and evapotranspiration 9. A shallow well is a well (GES-49 R&B Advt. No. 113/2018-19) (A) Whose depth is less than its width (B) Whose depth is less than 20 feet (C) Which does not rest on a mota formation (D) Which rests on a mota formation akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 10. A ground water basin consists of 1 𝑘𝑚2 area of plains. The maximum groundwater fluctuation has been observed to be 1.0 m. What is the available ground water storage if the specific yield of the basin is 10%? (AE-350 NWRWSK Advt. No. 32/2019-20) (A) 10000 𝑚3 (B) 100000 𝑚3 I R (C) 1000000 𝑚3 (D) 10000000 𝑚3 S A Y 11. Water derived from precipitation (rain and snow) which infiltrates into ground is called S H (AE-350 NWRWSK Advt. No. 32/2019-20) (A) Juvenile Water (C) Connote Water (B) Meteoric Water (D) Hygroscopic Water A K BY 12.In all ground water exploration programmers, one of the main objectives is to locate M Y (AE-350 NWRWSK Advt. No. 32/2019-20) (A) Wilting Zone D E (B) Capillary Zone (C) Phreatic Water Zone C A (D) Vadose Zone A 13. Rocks like Basalt, Granite without fissures are examples of I C (AE-350 NWRWSK Advt. No. 32/2019-20) (A) Aquifer S (C) Aquiclude T (B) Aquitard (D) Aquifuge L I HO 14. Artesian well is a well which (AE-350 NWRWSK Advt. No. 32/2019-20) (A) Does not require a pump to bring water to the surface (B) Requires a pump to bring water to the surface (C) Has the highest specific yield of water (D) Has the highest specific retention of water 15. Water existing in capillary zone is a part of (GES-28 GWSSB Advt. No. 41/2020-21) (A) Phreatic water (B) ground water (C) gravity water (D) vadose water 16. The upper limit of Reynold’s number for the Darcy’s law to be valid for groundwater flow is (GES-28 GWSSB Advt. No. 41/2020-21) (A) 0.1 (B) 1 (C) 10 (D) 50 17. An unconfined aquifer of porosity 28%, permeability 30 m/d and specific yield of 0.22 has an area of 50 𝑘𝑚2. If the water table falls by 0.10 m, then what would be the volume of water retained in aquifer? (GES-61 NWRWSK Advt. No. 71/2020-21) 3 (A) 300000 𝑚 (B) 1100000 𝑚3 3 (C) 1400000 𝑚 (D) None of the above 18. The radius of influence zone is given empirically as a function of drawdown within the pump well (Sw) and the aquifer hydraulic conductivity (k). For numerical value of Sw = 12.5 m and k = 4 × 10−6 m/s, the radius of influence zone would be (GES-61 NWRWSK Advt. No. 71/2020-21) (A) 56 m (B) 64 m (C) 75 m (D) 82 m akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 19. An aquifer is stratified into three layers parallel to the bedding plane with specification as under. Layer 1,2&3, Thickness (m) 4,2&6 and Conductivity(m/d) 30,10&20 respectively The transmissivity of aquifer in 𝑚2 /d is (GES-61 NWRWSK Advt. No. 71/2020-21) (A) 23 (B) 80 (C) 227 (D) 260 I R S 20. Water existing in the capillary zone is a part of (A) Phreatic water (B) ground water A Y (AE-4 GMC Advt. No. 86/2020-21) (C) gravity water (D) vadose water S H 21. Specific yield of an aquifer is defined as the ratio of the A K (AE-4 GMC Advt. No. 86/2020-21) (A) Volume of pore space to the volume of soil BY (B) Volume of water freely drained from a saturated soil to the volume of soil M Y (C) Volume of water retained when a saturated soil is freely drained to the volume of soil (D) Volume of pore space to the volume of soil D E C A 22. When an aquifer is overlain by a confined bed of impervious material, this confined bed of overburden is called as A (AE-165 NWRWSK Advt.No.120/2020-21) (A) Aquiclude I C (B) Artesian Aquifer S T (C) Perched Aquifer (D) None of the above L I 23. The various infiltration wells connected by porous pipes to a sump well is called as HO(A) Jack well (C) Collectors (B) Spring (D) Dug well (AE-165 NWRWSK Advt.No.120/2020-21) 24. The volume of water that can be extracted by force of gravity from a unit volume of aquifer material is called (AE-119 NWRWSK Advt. No. 15/2021-22) (A) Specific retention (B) Specific yield (C) Specific storage (D) Specific capacity 25. A soil formation through which only seepage is possible, being partly permeable and capable of giving insignificant yield, is classified as (AE-119 NWRWSK Advt. No. 15/2021-22) (A) Aquifer (B) Aquitard (C) Aquifuge (D) Aquiclude 26. An acquifer, sandwiched between the top and the bottom aquicludes, will supply water to a well, called (AE-28 GMB Advt. No. 19/2021-22) (A) Non-artesian well (B) artesian well (C) Flowing well (D) tube well 27. Ordinary gravity wells of 2 to 5 m diameter which are constructed to tap water from the top mostwater bearing strata are called (DEE-3 GMC Advt. No. 38/2021-22) (A) Non-artesian wells (B) artesian wells (C) flowing wells (D) perched wells akshaypatel00037 holisticacademy holistic.academy  AKSHAY SIR - 8447765100 28. The geological formation which does not yield water freely to wells due to lesser perm