MCQOPTIONS
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MCQOPTIONS
This section includes 24 Mcqs, each offering curated multiple-choice questions to sharpen your Irrigation knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The culturable commanded area for a distributary is 2 108m . The intensity of irrigation for a crop is 40%. If kor water depth and kor period for the crop are 14 cm and 4 weeks, respectively, the peak demand discharge is |
| A. | 2.63 m /s |
| B. | 4.63 m /s |
| C. | 8.58 m /s |
| D. | 11.58 m /s |
| Answer» C. 8.58 m /s | |
| 2. |
The two columns below show some parameters and their possible values. Parameters P Gross Command Area Q Permanent Wilting Point R Duty of canal water S Delta of wheat Value I 100 hectares/cumec II 6 C III 1000 hectares IV 1000 cm V 40 cm VI 0.12 Which of the following options matches the parameters and the values correctly? |
| A. | P-I, Q-II, R-III, S-IV |
| B. | P-III, Q-VI, R-I, S-V |
| C. | P-I, Q-V, R-VI, S-II |
| D. | P-III, Q-II, R-V, S-IV |
| Answer» C. P-I, Q-V, R-VI, S-II | |
| 3. |
The consumptive use of water for a crop during a particular stage of growth is 2.0 mm/day. The maximum depth of available water in the root zone is 60 mm. Irrigation is required when the amount of available water in the root zone is low. Frequency of irrigation should be |
| A. | 10 days |
| B. | 15 days |
| C. | 20 days |
| D. | 25 days |
| Answer» C. 20 days | |
| 4. |
In a cultivated area, the soil has porosity of 45% and field capacity of 38%. For a particular crop, the root zone depth is 1.0 m, the permanent wilting point is 10% and the consumptive use is 15 mm/d. If the irrigation efficiency is 60%, what should be the frequency of irrigation such that the moisture content does not fall below 50% of the maximum available moisture? |
| A. | 5d |
| B. | 6d |
| C. | 9d |
| D. | 15d |
| Answer» C. 9d | |
| 5. |
On which of the canal systems, R.G. Kennedy, executive engineer in the Punjab Irrigation Department made his observations for porposing his theory on stable channels? |
| A. | Krishan Western Delta canals |
| B. | Lower Bari Doab canals |
| C. | Lower Channel canals |
| D. | Upper Bari Doab canals |
| Answer» C. Lower Channel canals | |
| 6. |
A sprinkler irrigation system is suitable when |
| A. | The land gradient is steep and the soil is easily erodible. |
| B. | the soil is having low permeability |
| C. | the water table is low |
| D. | the crops to be grown have deep roots. |
| Answer» B. the soil is having low permeability | |
| 7. |
A field was supplied water from an irrigation tank at a rate of 120 L/s to irrigate an area of 2.5 hectares. The duration of irrigation is 8 hours. It was found that the actual delivery at the field, which is about 4 km from the tank, was 100 L/s. The runoff loss in the field was estimated as 800 m . The application efficiency in this situation is |
| A. | 62% |
| B. | 72% |
| C. | 76% |
| D. | 80% |
| Answer» C. 76% | |
| 8. |
If duty (D) is 1428 hectares/cumec and base period (B) is 120 days for an irrigated crop, then delta (D) in meters is given by |
| A. | 102.8 |
| B. | 0.73 |
| C. | 1.38 |
| D. | 0.01 |
| Answer» C. 1.38 | |
| 9. |
The culturable commanded area for a distributary is 2 10 |
| A. | 2.63 m /s |
| B. | 4.63 m /s |
| C. | 8.58 m /s |
| D. | 11.58 m /s |
| Answer» C. 8.58 m /s | |
| 10. |
The moisture content of soil in the root zone of an agricultural crop at certain stage is found to be 0.05. The field capacity of the soil is 0.15. The root zone depth is 1.1m. The consumptive use of crop at this stage is 2.5 mm/day and there is no precipitation during this peirod. Irrigation efficiency is 65%. It is intended to raise the moisture contant to the field capacity in 8 days through irrigation. The necessary depth of irrigation is |
| A. | 115 mm |
| B. | 169 mm |
| C. | 200 mm |
| D. | 285 mm |
| Answer» E. | |
| 11. |
While designing a hydraulic structure, the piezometric head at bottom of the floor is computed as 10m. The datum is 3m below floor bottom. The assured standing water depth above the floor is 2m. The specific gravity of the floor is computed as 10m. The datum is 3m below floor bottom. The assured standing water depth above the floor is 2m. The specific gravity of the floor material is 2.5. The floor thickness should be |
| A. | 2.00 m |
| B. | 3.33 m |
| C. | 4.40 m |
| D. | 6.00 m |
| Answer» B. 3.33 m | |
| 12. |
The total irrigation depth of water, required by a certain crop in its entire growing period (150 days), is 25.92 cm. The culturable command area for a distributary channel is 100,000 hectares. The distributary channel shall be designed for a discharge. |
| A. | less than 2 cumecs |
| B. | 2 cumecs |
| C. | 20 cumecs |
| D. | more than 20 cumecs |
| Answer» E. | |
| 13. |
A canal was designed to supply the irrigaiton needs of 1200 hectares to land growing rice of 140 days base period having a Delta of 134 cms. If this canala water is used to irrigate wheat of base period 120 days having a Delta of 52 cm, the area (in Hectares) that can be irrigated is |
| A. | 2650 |
| B. | 3608 |
| C. | 543 |
| D. | none of the above |
| Answer» B. 3608 | |
| 14. |
An outlet irrigates an area of 20 ha. The discharge (I/s) required at this outlet to meet the evapotranspiration requirement of 20 mm occurring uniformly in 20 days neglecting other field losses is |
| A. | 2.52 |
| B. | 2.31 |
| C. | 2.01 |
| D. | 1.52 |
| Answer» C. 2.01 | |
| 15. |
A canal irrigates a portion of a culturable command area to grow sugarcane and wheat. The average discharges required to grow sugarcane and wheat area, respectively, 0.36 and 0.27 cumecs. the time factor is 0.9. The required design capacity of the canal is |
| A. | 0.36 cumecs |
| B. | 0.40 cumecs |
| C. | 0.63 cumecs |
| D. | 0.70 cumecs |
| Answer» E. | |
| 16. |
The two columns below show some parameters and their possible values. |
| A. | P-I, Q-II, R-III, S-IV |
| B. | P-III, Q-VI, R-I, S-V |
| C. | P-I, Q-V, R-VI, S-II |
| D. | P-III, Q-II, R-V, S-IV |
| Answer» C. P-I, Q-V, R-VI, S-II | |
| 17. |
The area of crop Y that can be irrigated when the available capacity of irrigation system is 40 litres/sec is |
| A. | 40 hectares |
| B. | 36 hectares |
| C. | 30 hectares |
| D. | 27 hectares |
| Answer» E. | |
| 18. |
The culturable command area for a distributary channel is 20,000 hectares. Wheat is grown in the entire area and the intensity of irrigation is 50%. The kor period for wheat is 30 days and the kor water depth is 120 mm. The outlet discharge for the distributary should be |
| A. | 2.85 m /s |
| B. | 3.21 m /s |
| C. | 4.63 m /s |
| D. | 5.23 m /s |
| Answer» D. 5.23 m /s | |
| 19. |
The capacity of irrigation system required to irrigate crop X in 36 hectares is |
| A. | 83 litres/sec |
| B. | 67 litres/sec |
| C. | 57 litres/sec |
| D. | 53 litres/sec |
| Answer» C. 57 litres/sec | |
| 20. |
A field channel has cultivable commanded area of 2000 hectares. The intensities of irrigation for gram and wheat are 30% and 50% respectively. Gram has a kor period of 18 days, kor depth of 12 cm, while wheat has a kor period of 18 days and a kor depth of 15 cm. The discharge (in m /s) required in the field channel to supply water to the commanded area during the kor period is ____ |
| A. | 0.57 m /s |
| B. | 1.427 m /s |
| C. | 2 m /s |
| D. | 2.5 m /s |
| Answer» C. 2 m /s | |
| 21. |
A rectangular channel of 2.5 m width is carrying a discharge of 4 m /s. Considering that acceleration due to gravity as 9.81 m/s , the velocity of flow (in m/s) corresponding to the critical depth (at which the specific energy is minimum) is ________. |
| A. | 1.5 m/s |
| B. | 2 m/s |
| C. | 2.5 m/s |
| D. | 3 m/s |
| Answer» D. 3 m/s | |
| 22. |
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 m /s is |
| A. | 13.82 |
| B. | 18.85 |
| C. | 23.04 |
| D. | 230.40 |
| Answer» B. 18.85 | |
| 23. |
The transplantation of rice requires 10 days and total depth of water required during transplantation is 48 cm. During transplantation, there is an effective rainfall (useful for irrigation) of 8 cm. The duty of irrigation water (in hectares/cumec) is |
| A. | 612 |
| B. | 216 |
| C. | 300 |
| D. | 108 |
| Answer» C. 300 | |
| 24. |
An agricultural land of 437 ha is to be irrigated for a particular crop. The base period of the crop is 90 days and the total depth of water required by the crop is 105 cm. If a rainfall of 15 cm occurs during the base period, the duty of irrigation water is |
| A. | 437 ha/cumec |
| B. | 486 ha/cumec |
| C. | 741 ha/cumec |
| D. | 864 ha/cumec |
| Answer» E. | |