Published by:
CGP EDU Academic Team
Published on: September 13, 2026
Ice starts forming in lake with water at 0 
and when the atmospheric temperature is – 10 
. If the time taken for 1 cm of ice be 7 hr, then the time taken for the thickness of ice to change from 1 cm to 2 cm is
Text Solution
Verified by ExpertsThe correct answer is:
D
Time required in increment of thickness from y 1 to y 2
In first condition y 1 = 0, y 2 = 1 cm then Δ Δ t 1 ∝ ∝ (1 2 – 0 2 )
In second condition y 1 = 1 cm, y 2 = 2 cm then Δ Δ t 2 ∝ ∝ (2 2 – 1 2 )
∴ ∴ 
⇒ ⇒ Δ Δ t 2 = 3 × × Δ Δ t 1 = 3 × × 7 = 21 hrs.
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