WAEC Physics 2024 Objective — Question 32
Question 32 of 50 from the West African Examinations Council (WAEC) Physics 2024 Objective paper, with the correct answer and a full explanation.
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32. In which of the following devices is the thermal expansion considered a disadvantage?
- A. Fire alarm
- B. Thermostat
- C. Bimetallic thermometer
- D. Balance wheel of a watchCorrect
Explanation
Thermal expansion in the balance wheel of a watch is disadvantageous because it causes dimensional changes that alter the wheel's moment of inertia, impacting the oscillation period and thus the accuracy of timekeeping.
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