NDA 2026 Physics question

Consider the following statements : Statement-I : Marine animals remain alive in winter and move near the bottom of lakes despite frozen water on the surface. Statement-II : The density of water is maximum at 4°C and water at the bottom of lakes remains warm in winter. Which one of the following is correct in respect of the above statements ?

(A)Both Statement-I and Statement-II are correct and Statement-II explains Statement-I.Correct
(B)Both Statement-I and Statement-II are correct, but Statement-II does not explain Statement-I.
(C)Statement-I is correct, but Statement-II is not correct.
(D)Statement-I is not correct, but Statement-II is correct.

Answer: (A)

Solution

Water is densest at 4 °C. In winter the water at 4 °C sinks to the bottom, while colder, lighter water stays on top and freezes; the ice layer then insulates the water

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Question ID VK-033416