Q.3
Match List-I with List-II:
Choose the correct answer from the options given below:
|
List - I
सूची - I
Drilling / Well / Aquifer Type
List-I (Drilling / Well / Aquifer Type
|
List - II
सूची - II
Characteristics
List-II (Characteristics
|
||
|---|---|---|---|
| A | Percussion (cable tool) drilling Percussion (cable tool) drilling | I | Unconsolidated formations Unconsolidated formations |
| B | Rotary drilling Rotary drilling | II | Consolidated formations Consolidated formations |
| C | Artesian well Artesian well | III | Unconfined aquifer Unconfined aquifer |
| D | Perched aquifer Perched aquifer | IV | Confined aquifer Confined aquifer |
- Groundwater Wells and Drilling Technologies:
- Percussion (cable tool) drilling $\to$ (II): Uses heavy drill bits lifted and dropped repeatedly, exceptionally suited for hard, fractured, consolidated formations (rock/boulders).
- Rotary drilling $\to$ (I): Uses a rotating bit with circulated drilling mud (bentonite), fast and optimal for unconsolidated formations (sands, silts, clays).
- Artesian well $\to$ (IV): Taps a confined aquifer under hydrostatic piezometric pressure higher than the top of the aquifer (or ground surface).
- Perched aquifer $\to$ (III): A local lens of groundwater resting on an impermeable stratum above the regional main water table, behaving as a localized unconfined aquifer.
- Matching Result: (A) - (II), (B) - (I), (C) - (IV), (D) - (III) (Option 3).
Correct option: (3) (A) - (II), (B) - (I), (C) - (IV), (D) - (ttl)
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