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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°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°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°C , stay constant for sometime and then gets converted to ice.
  • Then it decreases below 0°C.
  • Hence it is the incorrect option.

Option (C)

  • The temperature does not stay constant at 0°C forever as shown in the graph
  • After getting converted into ice it decreases below 0°C.
  • Hence it is the incorrect option.

Option (D)

  • After reaching 0°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°C.
  • Hence the temperature decreases.
  • Hence it is the incorrect option

Therefore, option (A) is the correct answer


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