Objective Question & Answer

P. Unconfined aquifer - 3. Water Table aquifer

An unconfined aquifer is a water-bearing stratum where the upper water surface (the water

table) is at atmospheric pressure. Because its upper boundary is the water table, it is

commonly called a water table aquifer.

Q. Confined aquifer - 4. Artesian aquifer

A confined aquifer is sandwiched between two impermeable layers, keeping the water inside

under pressure greater than atmospheric pressure. When a well penetrates this layer, water

rises above the aquifer level, which is why it is called an artesian aquifer.

R. Aquitard - 1. Insignificant yield

An aquitard is a saturated, poorly permeable geological formation (like sandy clay). While it

can store water and allow slow seepage between aquifers, it cannot transmit water fast

enough to provide an adequate supply to wells, resulting in an insignificant yield.

S. Aquiclude - 2. Impermeable to flow of water

An aquiclude is a highly porous formation that contains a large amount of water but is

completely impermeable to its flow due to extremely small pore sizes (like pure clay). 

It prevents any effective movement or transmission of groundwater.