Question

# A glass tumbler containing hot water is kept in the freezer compartment of a refrigerator (temperature < 0°C). If you could measure the temperature of the content of the tumbler, which of the following graphs (Fig.) would correctly represent the change in its temperature as a function of time.

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Solution

## The correct option is A Explanation for the correct answer:-Option (A) The temperature of the water that is kept in the tumbler will first fall down initially when kept in the refrigerator till it reaches $0°\mathrm{C}$.After reaching this point, the temperature remains constant for some time until all the water gets turned into ice.After turning into ice the temperature will start decreasing again and get below $0°\mathrm{C}$Hence it is the correct option.Explanation for the incorrect answer:-Option (B) The temperature does not decrease at a steady rate as shown in the graph.It first decreases to $0°\mathrm{C}$ , stay constant for sometime and then gets converted to ice.Then it decreases below $0°\mathrm{C}$.Hence it is the incorrect option.Option (C) The temperature does not stay constant at $0°\mathrm{C}$ forever as shown in the graphAfter getting converted into ice it decreases below $0°\mathrm{C}$.Hence it is the incorrect option.Option (D) After reaching $0°\mathrm{C}$ and getting converted into ice, the temperature does not rise up as shown in the graph.This is not possible because the temperature inside the refrigerator is below $0°\mathrm{C}$.Hence the temperature decreases.Hence it is the incorrect optionTherefore, option (A) is the correct answer

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