A cooling curve is plotted between the temperature of a hot body and time. Which of the following is not true for the cooling curve?

• A

  Cooling is faster from a calorimeter having a larger surface area than a smaller one.
• B

  Cooling is faster from a calorimeter painted black from outside than that from a polished surfaced calorimeter.
• C

  Cooling is faster from a copper calorimeter than from a steel calorimeter.
• Correct answer
  D

  The rate of cooling remains same throughout the experiment. Hence the graph is a straight line.

Hence, the correct answer is option: 'D'.