WAEC Physics 2021 Objective — Question 40
Question 40 of 50 from the West African Examinations Council (WAEC) Physics 2021 Objective paper, with the correct answer and a full explanation.
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40. An ice cube has a mass of 20 g at 5 °C. Calculate the energy required to raise its temperature to 0 °C. [Specific heat capacity of ice = 2.1 J g⁻¹ °C⁻¹]
- A. 105 J
- B. 100 J
- C. 42 J
- D. 210 JCorrect
Explanation
Energy = mcΔθ = 20×2.1×(5-0) = 210 J.
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