MCQOPTIONS
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MCQOPTIONS
This section includes 65 Mcqs, each offering curated multiple-choice questions to sharpen your Irrigation Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A lift irrigation scheme using a discharge of 96 m3 / hr is planned to raise a crop with an average Δ of 0.375 m. Intensity of irrigation is 60%. Assuming 3600 hours of working of the tubewell for a year, the culturable command area is |
| A. | 96 Ha |
| B. | 48 Ha |
| C. | 144 Ha |
| D. | 120 Ha |
| Answer» D. 120 Ha | |
| 2. |
Find the delta for a crop when its duty is 432 hectares / cumec on the field, if the base of the crop is 150 days. |
| A. | 150 cm |
| B. | 200 cm |
| C. | 300 cm |
| D. | 432 cm |
| Answer» D. 432 cm | |
| 3. |
Delta (Δ) in cm, duty (D) in hectare/Cumec and base period (B) in days are related is: |
| A. | \(\Delta = 864 \dfrac{B}{D}\) |
| B. | \(D = 8.64 \dfrac{B}{\Delta}\) |
| C. | \(B = 864 \dfrac{D}{\Delta}\) |
| D. | \(B = 864 \dfrac{\Delta}{D}\) |
| Answer» B. \(D = 8.64 \dfrac{B}{\Delta}\) | |
| 4. |
Crop are grown in a field having soil, which has field capacity of 30% and permanent wilting point of 13%. The effective depth of root zone is 80 cm. Irrigation water is supplied when the average soil moisture drops to 20%. Consider density of the soil as 1500 kg/m3 and density of water as 1000 kg/m3. If the daily consumptive use of the water for the crops is 2 mm, the frequency of Irrigating the crops (in days), is |
| A. | 7 |
| B. | 10 |
| C. | 81 |
| D. | 13 |
| Answer» D. 13 | |
| 5. |
Find the delta of a crop when its duty is 900 ha / cumec on the field. The base period of the crop is 100 days. |
| A. | 87 cm |
| B. | 64 cm |
| C. | 45 cm |
| D. | 96 cm |
| Answer» E. | |
| 6. |
Acidic soils are reclaimed by: |
| A. | Leaching of the soil |
| B. | Using limestone as a soil amendment |
| C. | Using gypsum as a soil amendment |
| D. | Provision of drainage |
| Answer» C. Using gypsum as a soil amendment | |
| 7. |
Duty is largest |
| A. | On the field |
| B. | At the head of the main canal |
| C. | Same at all places |
| D. | None of the above |
| Answer» B. At the head of the main canal | |
| 8. |
For cereal crops, the most commonly adopted method of irrigation is |
| A. | Check method |
| B. | Furrow method |
| C. | Free flooding method |
| D. | Sprinkler method |
| Answer» B. Furrow method | |
| 9. |
For a particular crop during its base period the unit water flowing day and night to irrigate the crop area is known as:- |
| A. | Duty |
| B. | Crop period |
| C. | Base period |
| D. | Delta |
| Answer» B. Crop period | |
| 10. |
A field measures 40 hectares. When 8 cumecs of water was supplied for 6 hours, 30 cm of water was stored in the root zone. The field application efficiency is nearly |
| A. | 70% |
| B. | 80% |
| C. | 85% |
| D. | 90% |
| Answer» B. 80% | |
| 11. |
If the moisture tension for a soil is 8 atmospheres, then the soil is at |
| A. | Field capacity |
| B. | Optimum moisture content |
| C. | Permanent wilting point |
| D. | Equivalent moisture |
| Answer» D. Equivalent moisture | |
| 12. |
A certain crop is grown in an area of 3000 hectares which is fed by a canal system. The data pertaining to irrigation is as follows:1. field capacity of soil = 29%2. optimum moisture = 17%3. effective depth of root zone = 80 cm4. relative density of soil = 1.302If the frequency of irrigation is 10 days and permanent writing point = 10%, then find the daily consumptive use. |
| A. | 12.5 cm |
| B. | 125 cm |
| C. | 0.125 cm |
| D. | 1.25 cm |
| Answer» E. | |
| 13. |
Consider the following data for irrigation water:S.No.ConcentrationMilli-equivalents per litre1Na+242Ca++3.63Mg++2The Sodium-Absorption Ratio WAR) is nearly |
| A. | 13.1 |
| B. | 14.3 |
| C. | 15.5 |
| D. | 16.7 |
| Answer» C. 15.5 | |
| 14. |
What is the variation in duty of water from the head of a main canal (M) to that in the field (F)? |
| A. | Duty of water at M is always greater than duty of water at F |
| B. | Duty of water at M is always less than duty of water at F |
| C. | Duty of water at M is always equal to duty of water at F |
| D. | Duty of water at M can be greater or less than duty of water at F |
| Answer» C. Duty of water at M is always equal to duty of water at F | |
| 15. |
In an irrigated field, the net irrigation requirement is 15 cm, the application efficiency is 80% and water conveyance efficiency is 60%. What is the gross irrigation requirement (in cm)? |
| A. | 11.25 |
| B. | 18.75 |
| C. | 25 |
| D. | 31.25 |
| Answer» E. | |
| 16. |
A reservoir with live storage of 400 million cubic meters of water is available to irrigate an area of 40,000 hectares with 2 fillings in a year. If the crop season is 125 days. The duty is _______ hectares / cumec |
| A. | 440 |
| B. | 540 |
| C. | 940 |
| D. | 1040 |
| Answer» C. 940 | |
| 17. |
Irrigation water is to be provided to a crop in a field to bring the moisture content of the soil from the existing 18% to the field capacity of the soil at 28%. The effective root zone of the crop is 70 cm. If the densities of the soil and water are 1.3 g/cm3 and 1.0 g/cm3 respectively, the depth of irrigation water (in mm) required for irrigating the crop is ________ |
| A. | 9.1 |
| B. | 8.1 |
| C. | 7.1 |
| D. | None of the above |
| Answer» E. | |
| 18. |
Available moisture is the difference in water content of soil between field capacity and _________. |
| A. | gravitational water |
| B. | permanent wilting point |
| C. | saturation capacity |
| D. | ultimate wilting point |
| Answer» C. saturation capacity | |
| 19. |
For an unconfined aquifer, the specific yield is 20%, specific retention is 15%, and permeability is 35 m/day. Consider the following statements:1. The porosity of the aquifer is 35%.2. The transmissibility is 35 m2/day.3. The volume of water lost from storage per metre drop in the water table per 100 km2 area of the aquifer is 20 million m3.Which of the above statements are correct? |
| A. | 1 and 3 only |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» B. 1 and 2 only | |
| 20. |
A crop required a total depth of 90 cm of water for a base period of 110 days. Then duty of water is - |
| A. | 918 Hec/Cumec |
| B. | 1123 Hec/Cumec |
| C. | 1026 Hec/Cumec |
| D. | 1056 Hec/Cumec |
| Answer» E. | |
| 21. |
Consumptive Use refers to the loss of water as a result of |
| A. | Evaporation and Transpiration |
| B. | Crop Water Requirement |
| C. | Evaporation and Infiltration |
| D. | Evaporation and Transpiration from the cropped area |
| Answer» E. | |
| 22. |
1 cumec day = ? |
| A. | 864 hectare-metres |
| B. | 86.4 hectare-metres |
| C. | 8.64 hectare-metres |
| D. | 0.86 hectare-metres |
| Answer» D. 0.86 hectare-metres | |
| 23. |
Permanent wilting point moisture content for a crop represents the |
| A. | hygroscopic water |
| B. | capillary water |
| C. | field capacity water |
| D. | water of adhesion |
| Answer» B. capillary water | |
| 24. |
A front-end loader on a given job moves a load of 1.5 m3 of loose soil in one cycle consisting of loading-lifting-travelling-unloading-return trip-and-ready for next loading. If each cycle time is 1.2 minutes, the actual output will be |
| A. | 75 m3/hour |
| B. | 70 m3/hour |
| C. | 65 m3/hour |
| D. | 60 m3/hour |
| Answer» B. 70 m3/hour | |
| 25. |
In which method of assessment of irrigation water are areas sowing crops recorded by a patrol both, at the time of sowing and maturity, and the end of the crop period a 'demand statement' for each irrigator is prepared? |
| A. | Assessment on area basis |
| B. | Betterment levy basis |
| C. | Assessment on composite rate basis |
| D. | Permanent assessment |
| Answer» B. Betterment levy basis | |
| 26. |
Irrigation canals are generally aligned along: |
| A. | Ridge line |
| B. | Contour line |
| C. | Valley line |
| D. | Straight line |
| Answer» B. Contour line | |
| 27. |
Consider the following dataRoot zone depth = 2 mExisting water content = 5%Dry density of soil = 15 kN/m3Water applied to the soil = 500 m3Water loss due to evaporation and deep percolation = 10%Area of plot = 1000 m2The field capacity of the soil will be nearly |
| A. | 16.8% |
| B. | 17.7% |
| C. | 18.8% |
| D. | 19.7% |
| Answer» E. | |
| 28. |
Given that the base period is 100 days and the duty of the canal is 1000 hectares per cumec, the depth of water will be: |
| A. | 0.864 cm |
| B. | 8.64 cm |
| C. | 86.4 cm |
| D. | 864 cm |
| Answer» D. 864 cm | |
| 29. |
In drip irrigation system, which one of the following emitters is not based on definitions by American Society of Agricultural Engineers (ASAE)? |
| A. | Emitter |
| B. | Pulsating emitter |
| C. | Long path emitter |
| D. | Multi-outlet emitter |
| Answer» C. Long path emitter | |
| 30. |
Duty on capacity is also known as: |
| A. | nominal duty |
| B. | capacity factor |
| C. | full supply coefficient |
| D. | root zone depth |
| Answer» D. root zone depth | |
| 31. |
If duty (D) is 1428 hectares/cumec and base period (B) is 120 days for an irrigated crop, then delta (Δ) in metres is given by |
| A. | 102.8 |
| B. | 0.73 |
| C. | 1.38 |
| D. | 0.01 |
| Answer» C. 1.38 | |
| 32. |
If B = 100 days and D = 1400 hectares/cumec, then find delta |
| A. | 65.71 cm |
| B. | 61.71 cm |
| C. | 55.71 cm |
| D. | 51.71 cm |
| Answer» C. 55.71 cm | |
| 33. |
A Persian wheel with an average discharge of 230 litre/minute irrigates 1 hectare wheat crop in 50 hours. The average depth of irrigation will be nearly |
| A. | 4 cm |
| B. | 5 cm |
| C. | 6 cm |
| D. | 7 cm |
| Answer» E. | |
| 34. |
In arid areas, with uneven land surface most suitable method of irrigation is |
| A. | basin method |
| B. | check flooding |
| C. | furrow irrigation |
| D. | sprinkler irrigation |
| Answer» E. | |
| 35. |
Intensity of irrigation… |
| A. | Is the percentage of culturable commanded area proposed to be irrigated annually. |
| B. | Is always more than 100% |
| C. | Is the percentage that could be ideally irrigated |
| D. | All the options are correct |
| Answer» B. Is always more than 100% | |
| 36. |
Delta (D) in cm, Duty (D) in hectare/cumec and base period (B) in days are related as |
| A. | ∆ = 864 \({ B \over D}\) |
| B. | B = 864 \({ D \over \Delta }\) |
| C. | B = 864 \({ \Delta \over D }\) |
| D. | D = 8.64 \({ B \over \Delta }\) |
| Answer» B. B = 864 \({ D \over \Delta }\) | |
| 37. |
Gram crop has a Kor period of 18 days and Kor depth of 12 cm. The duty of the gram is |
| A. | 520 ha/cumec |
| B. | 790 ha/cumec |
| C. | 960 ha/cumec |
| D. | 1296 ha/cumec |
| Answer» E. | |
| 38. |
Leaching is a process |
| A. | By which alkali salts present in the soil are dissolved and drained away. |
| B. | By which alkali salts in soil come up with water |
| C. | of draining excess water of irrigation |
| D. | which controls water-logging |
| Answer» B. By which alkali salts in soil come up with water | |
| 39. |
For a irrigated field having : Field capacity = 30%, Permanent wilting point = 10%, Permissible depletion of available moisture = 50%, Dry weight of soil = 14.70 kN / m3, Unit weight of water = 9.8 kN / m3 and Effective rainfall = 30 mm, what is the net irrigation requirement per meter depth of soil? |
| A. | 300 mm |
| B. | 150 mm |
| C. | 120 mm |
| D. | 90 mm |
| Answer» D. 90 mm | |
| 40. |
Permanent wilting point is |
| A. | a characteristic of the plant |
| B. | a soil characteristic |
| C. | a soil characteristic modified by the crop |
| D. | dependent on soil water plant fetiliser interaction |
| Answer» C. a soil characteristic modified by the crop | |
| 41. |
Outlet discharge for a particular crop is given by: |
| A. | \(\frac{{Area}}{{Outlet\;factor}}\) |
| B. | \(\frac{{Outlet\;factor}}{{Area}}\) |
| C. | Area × outlet factor |
| D. | None of these |
| Answer» B. \(\frac{{Outlet\;factor}}{{Area}}\) | |
| 42. |
In an irrigated area 12 m3/s of water is diverted to a 0.32 km2 field area for four hours. The soil moisture measurement in the field done after irrigation showed that 0.4 m of water has been stored in the root zone. The water application efficiency (correct to nearest decimal) in this case is: |
| A. | 85% |
| B. | 74% |
| C. | 58.5% |
| D. | 66.6% |
| Answer» C. 58.5% | |
| 43. |
Kor water is the |
| A. | first watering before a crop is sown |
| B. | first watering after a crop is sown |
| C. | first water after a crop is grown |
| D. | water of least depth |
| Answer» C. first water after a crop is grown | |
| 44. |
For a soil, field capacity and permanent wilting coefficient are 30% and 12% respectively. The available water in this case is |
| A. | 12% |
| B. | 18% |
| C. | 30% |
| D. | 42% |
| Answer» C. 30% | |
| 45. |
Consider the following statements in connection with soil-water-crop relationship:1. Water utilization by plants is mainly from capillary water.2. The amount of irrigation water required to meet the evapotranspiration needs of the crop during its full growth duration is its consumptive irrigation requirement.3. The depth of water required to bring the soil-moisture level of a given soil up to its field capacity is called hygroscopic water.4. With continuous increase in quantity of water applied, the yield of most crops increases up to a certain limit and then is expected to be constant.Which of the above statements are correct? |
| A. | 1 and 2 only |
| B. | 2 and 3 only |
| C. | 3 and 4 only |
| D. | 1 and 4 only |
| Answer» B. 2 and 3 only | |
| 46. |
12 m3/sec of water is diverted to a 30 hectare field for 5 hours. Soil probing after irrigation showed that 0.4 m of water had been stored in the root zone. Water application efficiency in this case would be |
| A. | 66.66% |
| B. | 77.77% |
| C. | 44.44% |
| D. | 55.55% |
| Answer» E. | |
| 47. |
In an irrigation project, in a certain year, 60% and 46% of the cultivable command area in Kharif and Rabi respectively, remained without water and rest of the area got irrigation water. The intensity of irrigation in that year for the project was |
| A. | 126 % |
| B. | 80 % |
| C. | 124 % |
| D. | 94 % |
| Answer» E. | |
| 48. |
A crop requires a total depth of 96 cm of water for a base period of 2280 hours. Find the duty of water. |
| A. | 855 hectares / cumec |
| B. | 1058 hectares / cumec |
| C. | 882 hectares / cumec |
| D. | 765 hectares / cumec |
| Answer» B. 1058 hectares / cumec | |
| 49. |
Among the following types of water, which one is chemically combined in the crystal structure of the soil mineral and can be removed only by breaking the crystal structure? |
| A. | Structural water |
| B. | Hygroscopic water |
| C. | Capillary water |
| D. | Adsorbed water |
| Answer» B. Hygroscopic water | |
| 50. |
A canal has designed to supply the irrigation needs of 1000 ha of land growing rice of 140 days base period and having a delta of 126 cm. If the canal water is used to irrigate wheat of base period 120 days and having a delta of 60 cm, the area that can be irrigated is |
| A. | 1600 ha |
| B. | 2000 ha |
| C. | 1800 ha |
| D. | 2200 ha |
| Answer» D. 2200 ha | |