A) \[{{2}^{o}}C\]
B) \[{{3}^{o}}C\]
C) \[{{4}^{o}}C\]
D) \[{{1}^{o}}C\]
Correct Answer: C
Solution :
A lake cools from the surface down. Above \[4{}^\circ C,\] the cooled water at the surface flows to the bottom because of it?s greater density. But when the surface temperature drops below \[4{}^\circ C\] (here it is \[2{}^\circ C\]), the water near the surface is less dense than the warmer water below. Hence the downward flow ceases, the water at the bottom remains at \[4{}^\circ C\] until nearly the entire lake, is frozen.
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