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JAMB Physics 1986 Question 18

Question 18

Thermal Expansion

The expansion of solids can be considered a disadvantage in the

  1. A.balance wheel of a watch
  2. B.fitting of wheels on rims
  3. C.fire alarm
  4. D.thermostat.
Show the answer and explanation

Answer: A (balance wheel of a watch)

Explanation

When a watch's balance wheel expands in heat its timing changes, which is a nuisance. Fitting tyres on wheels, fire alarms and thermostats all make use of expansion.