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ICSE Class 10 Physics Question 27 of 27

Solved 2024 Specimen Paper ICSE Class 10 Physics — Question 17

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Question

Question 9(ii)

The diagram below shows a cooling curve for a substance:

(a) State the temperatures at which the substance condenses.

(b) The temperature range in which the substance is in liquid state.

The diagram shows a cooling curve for a substance. State the temperatures at which the substance condenses. The temperature range in which the substance is in liquid state. ICSE 2024 Specimen Physics Solved Question Paper.

(c) Why do we prefer ice to ice-cold water for cooling a drink?

Answer

(a) Substance condenses at 150° C

(b) 150 to 60°C

(c) 1 g of ice at 0° C takes 336 J of heat energy from the drink to melt into water at 0° C. Thus, the drink liberates an additional 336 J of heat energy to 1 g ice at 0° C than to 1 g ice-cold water at 0° C. Therefore, cooling produced by 1 g ice at 0° C is much more than that by 1 g water at 0° C.