JAMB and WAEC Physics questions: Thermal expansion

23 questions with answers and explanations. Tap an option to check yourself.

1. Question 21· Thermal expansion· WAEC

   Gaps are left between lengths of railway line in order to

   • Aallow for expansion in hot weather
   • Breduce noise
   • Csave steel
   • Ddrain rainwater

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   Explanation and discussion

2. Question 22· Thermal expansion· JAMB

   A metal has linear expansivity 2 × 10⁻⁵ K⁻¹. Its cubic expansivity is about

   • A8 × 10⁻⁶ K⁻¹
   • B2 × 10⁻⁵ K⁻¹
   • C4 × 10⁻⁵ K⁻¹
   • D6 × 10⁻⁵ K⁻¹

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   Explanation and discussion

3. Question 23· Thermal expansion· WAEC

   A bimetallic thermostat works because the two metals

   • Aexpand by different amounts when heated
   • Bhave the same expansivity
   • Care magnetic
   • Ddo not expand

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   Explanation and discussion