ICSE Class 10 Physics 2015 Solved Paper

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Question : 63
Total: 74
Water in lakes and ponds do not freeze at once in cold countries. Give a reason in support of your answer.
Solution:  
The specific latent heat of fusion of ice is sufficiently high (336Jg1) so to freeze water, a large quantity of heat has to be withdrawn, hence it freezes slowly.
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