MCQOPTIONS
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MCQOPTIONS
This section includes 83 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. |
In cavity tubewell, there is a possibility of water tapping through sides and the flow is radial. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 2. |
Which of the following method of lifting water is very suitable when the depth of well is from 12 to 20 meters? |
| A. | Denkli |
| B. | Churus |
| C. | Persian wheel |
| D. | Windmill |
| Answer» D. Windmill | |
| 3. |
Which of the following tubewell is suitable when a deep bearing stratum lies below an impervious layer and water contribution can take place through bottom only? |
| A. | Strainer type tubewell |
| B. | Abyssinian tubewell |
| C. | Cavity type tubewell |
| D. | Slotted type tubewell |
| Answer» D. Slotted type tubewell | |
| 4. |
Which is the fastest method of drilling and especially useful in unconsolidated formations? |
| A. | Cable tool method |
| B. | Water-jet boring method |
| C. | Hydraulic Rotary method |
| D. | Reverse Rotary method |
| Answer» D. Reverse Rotary method | |
| 5. |
The most widely used type of a deep state tube well in India is __________ |
| A. | cavity well |
| B. | strainer tube well |
| C. | slotted pipe gravel packed tube well |
| D. | both cavity and strainer tube well |
| Answer» C. slotted pipe gravel packed tube well | |
| 6. |
Incrustation of the tubewell pipes may lead to _________________ |
| A. | reduced discharge from the tubewell |
| B. | excessive discharge of sand with water |
| C. | discharge of highly alkaline water |
| D. | increased pumping rate |
| Answer» B. excessive discharge of sand with water | |
| 7. |
The yield of a well depends on ________________ |
| A. | permeability of soil |
| B. | area of aquifer opening into the wells |
| C. | actual flow velocity |
| D. | permeability and actual flow velocity |
| Answer» B. area of aquifer opening into the wells | |
| 8. |
The zone of aeration in a groundwater profile does not include ___________ |
| A. | capillary zone |
| B. | soil water zone |
| C. | intermediate zone |
| D. | saturation zone |
| Answer» E. | |
| 9. |
Which of the following property of geological formation represents its water storage capacity? |
| A. | Permeability |
| B. | Porosity |
| C. | Both permeability and porosity |
| D. | Transmissibility |
| Answer» C. Both permeability and porosity | |
| 10. |
Which zone contains water that is under molecular attraction? |
| A. | Zone of rock fracture |
| B. | Zone of rock flowage |
| C. | Zone of saturation |
| D. | Zone of aeration |
| Answer» E. | |
| 11. |
Water wells excavated through confined aquifers are known as ______________ |
| A. | artesian wells |
| B. | non-artesian wells |
| C. | gravity wells |
| D. | water table wells |
| Answer» B. non-artesian wells | |
| 12. |
Specific retention of groundwater is larger in coarse-grained soils. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 13. |
Field capacity of a ground aquifer equals _________ |
| A. | specific yield |
| B. | 100 – specific yield |
| C. | 100/ specific yield |
| D. | field capacity |
| Answer» C. 100/ specific yield | |
| 14. |
The safe depression head for open wells is generally taken to be x times the critical depression head when x is ______ |
| A. | 1/6 |
| B. | 1/3 |
| C. | 1/2 |
| D. | 3/4 |
| Answer» C. 1/2 | |
| 15. |
Which of the following gives an indication of the chemical quality of the groundwater? |
| A. | Geological logs |
| B. | Resistivity logs |
| C. | Sonic logs |
| D. | Thermal logs |
| Answer» C. Sonic logs | |
| 16. |
Energy is required in the utilisation of _____________ |
| A. | groundwater |
| B. | surface water |
| C. | both groundwater and surface water |
| D. | capillary water |
| Answer» B. surface water | |
| 17. |
Bored tube wells in rocky consolidated formations as are encountered in the South Indian States of our country are usually drilled by _____________ |
| A. | rotary drilling rigs |
| B. | percussion drilling rigs |
| C. | down the hole hammer (DTH) rigs |
| D. | cable method of drilling |
| Answer» D. cable method of drilling | |
| 18. |
The geological formation which may contain water but does not contain any yield is ____________ |
| A. | aquifer |
| B. | aquifuse |
| C. | aquiclude |
| D. | aquitard |
| Answer» D. aquitard | |
| 19. |
The performance of a well is measured by its ________ |
| A. | specific capacity |
| B. | specific yield |
| C. | storage coefficient |
| D. | permeability coefficient |
| Answer» B. specific yield | |
| 20. |
An example of aquitard stratum in the ground profile is a layer of ___________ |
| A. | granite rock |
| B. | clay |
| C. | sandy clay |
| D. | sandstone |
| Answer» D. sandstone | |
| 21. |
The standard specific capacity of a well is the well-discharge per unit of drawdown. This value of discharge should be obtained at ________ |
| A. | any drawdown |
| B. | a particular drawdown of 3 m |
| C. | the first 1 m of drawdown |
| D. | the first 2 m of drawdown |
| Answer» D. the first 2 m of drawdown | |
| 22. |
A household tube well is called Abyssinian tube well falls under _________ |
| A. | strainer type |
| B. | cavity type |
| C. | slotted type |
| D. | both cavity and slotted type |
| Answer» B. cavity type | |
| 23. |
The general average yield from standard tube wells is of order of____________ |
| A. | 5 L/sec |
| B. | 50 L/sec |
| C. | 500 L/sec |
| D. | 5000 L/sec |
| Answer» C. 500 L/sec | |
| 24. |
Mota layer sometimes is also known as Marbarwa or Magasan is an impervious layer. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 25. |
In case of a flowing well, the piezometric surface is always _________ |
| A. | below the ground level |
| B. | above the ground level |
| C. | at the ground level |
| D. | above or below the ground level |
| Answer» C. at the ground level | |
| 26. |
What is the volume of groundwater which can be extracted by gravity drainage from a soil stratum when expressed as percentage fraction of the volume of the soil stratum? |
| A. | Pellicular water |
| B. | Available water |
| C. | Specific yield |
| D. | Field capacity |
| Answer» D. Field capacity | |
| 27. |
A perched aquifer is found within ____________ |
| A. | unconfined aquifer |
| B. | confined aquifer |
| C. | aquiclude |
| D. | both confined and unconfined aquifer |
| Answer» B. confined aquifer | |
| 28. |
Open well has big diameter than tube well because ____________i. Open well has to irrigate more area.ii. Water contribution to the well is natural and therefore, the percolation area has to be more.iii. Storage of water has to be made before irrigation is done. |
| A. | i and ii |
| B. | i and iii |
| C. | ii and iii |
| D. | i, ii and iii |
| Answer» D. i, ii and iii | |
| 29. |
Depending upon the type of sub-soil formation, the construction of well is done in two ways i.e. Dug wells and Sunk wells. Dug wells are constructed in soft formations. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 30. |
The amount of water required from wells to mature a similar crop is more than that required in canal irrigation. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 31. |
A well is to be constructed in a fine sandy sub-soil formation. The discharge of the well under the depression head of 4 m is 0.004 m³/sec. Calculate the diameter of the well. |
| A. | 2 m |
| B. | 2.5 m |
| C. | 3 m |
| D. | 3.5 m |
| Answer» D. 3.5 m | |
| 32. |
The geological formation which yields only insignificant quantity of groundwater is _____________ |
| A. | aquifer |
| B. | aquifuse |
| C. | aquiclude |
| D. | aquitard |
| Answer» E. | |
| 33. |
The clogging of well screens and consequent reduction in pump efficiency is indicated by _____________ |
| A. | the high value of the well-loss |
| B. | the low value of the well-loss |
| C. | variable value of the well-loss |
| D. | both high and low value of the well-loss |
| Answer» B. the low value of the well-loss | |
| 34. |
An aquifer which is confined at its bottom but not at the top is called ___________ |
| A. | semi-confined aquifer |
| B. | confined aquifer |
| C. | unconfined aquifer |
| D. | artesian aquifer |
| Answer» D. artesian aquifer | |
| 35. |
Coefficient of storage (A) has the dimensions of _____ |
| A. | L³ |
| B. | L |
| C. | L² |
| D. | Dimensionless |
| Answer» E. | |
| 36. |
If the sub-soil formation is of fine sand, the rough value of the specific yield of well per unit area of the well (K/A) given by Marriot is ____________ |
| A. | 0.25 |
| B. | 0.50 |
| C. | 0.75 |
| D. | 1.0 |
| Answer» C. 0.75 | |
| 37. |
What is Pack Aquifer Ratio? |
| A. | D₅₀ of the gravel / D₅₀ of the aquifer |
| B. | D₅₀ of the aquifer / D₅₀ of the gravel |
| C. | D₆₀ of the aquifer material / D₁₀ of the aquifer material |
| D. | D₆₀ of the gravel / D₁₀ of the aquifer |
| Answer» B. D₅₀ of the aquifer / D₅₀ of the gravel | |
| 38. |
Duty of wells expressed in hectares the well can irrigate to bring a crop to maturity because of ___________ |
| A. | well irrigation is a minor scheme |
| B. | well water is lifted immediately and cannot be expressed in ha/m³/sec |
| C. | well is situated in the middle of the commanded area |
| D. | wells are owned by cultivators and so the source of supply is a private one |
| Answer» C. well is situated in the middle of the commanded area | |
| 39. |
Specific yield for an unconfined aquifer is ________________ |
| A. | greater than porosity |
| B. | less than porosity |
| C. | equal to porosity |
| D. | unrelated to porosity |
| Answer» C. equal to porosity | |
| 40. |
In which of the following zone the stresses are beyond the elastic limits? |
| A. | Zone of rock fracture |
| B. | Zone of rock flowage |
| C. | Zone of saturation |
| D. | Zone of aeration |
| Answer» C. Zone of saturation | |
| 41. |
Which of the following pump can effectively lift water under the maximum suction head of 6 to 8 meters? |
| A. | A single-stage centrifugal pump |
| B. | Submersible pumps |
| C. | Turbine pumps |
| D. | Jet pumps |
| Answer» B. Submersible pumps | |
| 42. |
The units of specific capacity of a well are _____ |
| A. | m³/sec |
| B. | m²/sec |
| C. | m/sec |
| D. | no units |
| Answer» C. m/sec | |
| 43. |
Which of the following geological formation does not contain any amount of groundwater? |
| A. | Aquitard |
| B. | Aquifer |
| C. | Aquiclude |
| D. | Aquifuge |
| Answer» E. | |
| 44. |
Which of the following geological formation contains and readily yields water to our tube wells? |
| A. | Aquifer |
| B. | Aquifuse |
| C. | Aquiclude |
| D. | Aquitard |
| Answer» B. Aquifuse | |
| 45. |
Which of the following drilling method is unsuitable in loose formations such as unconsolidated sand and gravel or quicksand? |
| A. | Percussion drilling |
| B. | Wash boring method |
| C. | Rotary boring method |
| D. | Reverse rotary method |
| Answer» B. Wash boring method | |
| 46. |
The discharge per unit drawdown at a well is known as ___________ |
| A. | specific yield |
| B. | specific retention |
| C. | specific capacity |
| D. | specific storage |
| Answer» D. specific storage | |
| 47. |
The line joining the static water levels in several wells excavated through a confined aquifer is known as the _____________ |
| A. | cone of depression |
| B. | piezometric surface |
| C. | perched water-table |
| D. | hypsometric curve |
| Answer» C. perched water-table | |
| 48. |
Which of the following is an effective method for the development of well? |
| A. | Surging |
| B. | Pumping |
| C. | Well development by compressed air |
| D. | Jetting |
| Answer» E. | |
| 49. |
Which of the following is the most important zone for a groundwater hydraulic engineer? |
| A. | Zone of rock fracture |
| B. | Zone of rock flowage |
| C. | Zone of saturation |
| D. | Zone of aeration |
| Answer» D. Zone of aeration | |
| 50. |
Rewhiding the well involves ____________________ |
| A. | heavy pumping of well |
| B. | starting and stopping of pumping intermittently |
| C. | forcing of the well water back into the aquifer |
| D. | jetting with water at high velocity |
| Answer» C. forcing of the well water back into the aquifer | |