Which of the following are true of solar ponds?
1.They produce potable water
2.They are thermal energy collectors
3.They use a salt gradient to inhibit heat loss
4.They are used for swimming in cold regions
5.They produce heated water
A1, 2 & 3 only
B2, 3 & 5 only ✓ Correct
C1, 2, 3 & 4 only
D2, 3, 4 & 5 only
Correct answer: (B) 2, 3 & 5 only
Explanation
Solar ponds are thermal energy collectors that use a salt gradient to trap heat and produce heated water.
Statement 2 holds, as the pond stores absorbed solar heat in its lower layer.
Statement 3 holds, since a salt concentration gradient suppresses convective heat loss.
Statement 5 holds, because the hot brine at the bottom delivers heated water.
Statement 1 fails, as solar ponds do not produce potable water.
Statement 4 fails, since they are not designed for swimming.
The dense salty bottom layer can reach temperatures near 90 degrees Celsius.
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