271. _________ are used for converting saline or brackish water into pure distilled water.

A. Photo voltaic cells
B. Solar desalination systems
C. Solar cookers
D. Solar water-heating
✅ The correct answer is option B.
Distillation desalination is one of mankind’s earliest forms of water treatment, and it is still a popular treatment solution throughout the world today. In ancient times, many civilizations used this process on their ships to convert sea water into drinking water.

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