SATHEE: Properties Of Solids And Liquids Question 435

Properties Of Solids And Liquids Question 435

Question: Ice starts forming in a lake with water at $0^{\circ} C$ when the atmospheric temperature is $- 10^{\circ} C$ . If the time taken for the first 1 cm of ice to be formed is 7 hours, then the time taken for the thickness of ice to change from 1 cm to 2 cm is

Options:

A) 7 hours

B) 14 hours

C) 21 hours

D) 3.5 hours

Show Answer

Answer:

Correct Answer: C

Solution:

[c] Since no heat flows through me central rod, temperature at the ends of the central rod will be same. So, it will form a wheatstone like network.

So. $\frac{K_{1}}{K_{2}} = \frac{K_{3}}{K_{4}} \Rightarrow k_{1} k_{4} = k_{2} k_{3}$

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Properties Of Solids And Liquids Question 435

Question: Ice starts forming in a lake with water at 0∘C when the atmospheric temperature is −10∘C . If the time taken for the first 1 cm of ice to be formed is 7 hours, then the time taken for the thickness of ice to change from 1 cm to 2 cm is

Options:

Answer:

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Question: Ice starts forming in a lake with water at $0^{\circ} C$ when the atmospheric temperature is $- 10^{\circ} C$ . If the time taken for the first 1 cm of ice to be formed is 7 hours, then the time taken for the thickness of ice to change from 1 cm to 2 cm is