Post-UTME Physics 2019 Objective — Question 2
Question 2 of 20 from the Post-UTME Screening (Post-UTME) Physics 2019 Objective paper, with the correct answer and a full explanation.
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The statement 'Heat lost by the hot body equals that gained by the cold one' is assumed when determining specific heat capacity by the method of mixtures. Which of the following validates the assumption? I. Lagging the calorimeter II. Ensuring that only SI units are used. III. Weighing the calorimeter, the lid and the stirrer.
- A. I only
- B. I and II only.
- C. I and III onlyCorrect
- D. II and III only.
Explanation
Lagging the calorimeter (to reduce heat loss to surroundings) and weighing the calorimeter/lid/stirrer (to account for their heat capacity) both help validate the no-heat-loss assumption; using SI units does not affect this physically.
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