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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 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 option:

Option A

  • The water will initially start cooling continuously until its temperature reaches 0°C.
  • The freezing point of water is 0°C.
  • Once the water reaches the freezing point, the temperature remains constant till the water becomes ice.
  • After water becomes ice, the temperature starts decreasing again.
  • Hence this option is correct.

Explanation for the incorrect options

Option B:

  • The water will initially start cooling continuously until its temperature reaches 0°C.
  • The freezing point of water is 0°C.
  • Once the water reaches the freezing point, the temperature remains constant till the water becomes ice.
  • After water becomes ice, the temperature starts decreasing again.
  • This graph does not show a constant temperature at 0°C for some time.
  • Hence this option is incorrect.

Option C:

  • The water will initially start cooling continuously until its temperature reaches 0°C.
  • The freezing point of water is 0°C.
  • Once the water reaches the freezing point, the temperature remains constant till the water becomes ice.
  • After water becomes ice, the temperature starts decreasing again.
  • This graph does not show the temperature decreasing below 0°C after some time.
  • Hence this option is incorrect.

Option D:

  • The water will initially start cooling continuously until its temperature reaches 0°C.
  • The freezing point of water is 0°C.
  • Once the water reaches the freezing point, the temperature remains constant till the water becomes ice.
  • After water becomes ice, the temperature starts decreasing again.
  • This graph does not show a constant temperature at 0°C for some time and then decreases below 0°C after some time.
  • Hence this option is incorrect.

Hence the correct option is A:


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