MCQOPTIONS
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MCQOPTIONS
This section includes 12 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 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 | |
| 2. |
Mota layer sometimes is also known as Marbarwa or Magasan is an impervious layer. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
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 | |
| 4. |
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 | |
| 5. |
An open well is called shallow well when ____________ |
| A. | the depth of well is small |
| B. | the water table is high |
| C. | it does not encounter mota formation |
| D. | it finds the foundation in the mota formation |
| Answer» D. it finds the foundation in the mota formation | |
| 6. |
A well 3 meters in diameter has its normal water level 3 meters below the ground level. By pumping water level in the well is depressed to 10 meters below the ground level. In 4 hours the water rises by 5 meters. Calculate the specific yield of the well. |
| A. | 2.213 m<sup>3</sup>/hr |
| B. | 5 m<sup>3</sup>/hr |
| C. | 1.242 m<sup>3</sup>/hr |
| D. | 3.224 m<sup>3</sup>/hr |
| Answer» B. 5 m<sup>3</sup>/hr | |
| 7. |
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 |
| Answer» C. | |
| 8. |
Which type of open well is suitable when the sub-soil is formed of gravel or coarse sand deposits? |
| A. | Unlined wells |
| B. | Wells with pervious lining |
| C. | Wells with impervious lining |
| D. | Temporary wells |
| Answer» C. Wells with impervious lining | |
| 9. |
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 | |
| 10. |
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 | |
| 11. |
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 | |
| 12. |
The rate of water contribution to the well increases with the increase in the depression head. |
| A. | True |
| B. | False |
| Answer» B. False | |