What is the common size of screen openings for wells?

Solution (By Examveda Team)

Question: What is the common size of screen openings for wells?

This question is about the size of the holes in well screens. Well screens are filters placed inside wells to prevent sand and other sediment from entering the well and contaminating the water.

The size of the openings needs to be just right. Too big, and unwanted materials get in. Too small, and the water can't flow easily enough.

The options give a range of sizes in millimeters (mm). Let's look at why some are more likely than others:

Option A (5.0 to 10mm): This is relatively large. While it might allow good water flow, it's also likely to let in too much sediment.

Option B (1.5 to 5.00 mm): This range is more reasonable. It balances allowing water flow with preventing most sediment.

Option C (15 to 20 mm): This is much too large. It would allow large amounts of sediment and debris to enter the well.

Option D (4.5 to 5.00 mm): This is similar to part of option A and is also a bit on the larger side, possibly allowing more sediment than ideal.

Considering the balance between water flow and sediment prevention, option B (1.5 to 5.00 mm) is the most likely common size range for well screen openings.