WAEC Physics 2012 Objective — Question 3
Question 3 of 50 from the West African Examinations Council (WAEC) Physics 2012 Objective paper, with the correct answer and a full explanation.
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A metal rod of density 7000 kgm⁻³ and cross-sectional area of 0.001257 m² has a mass of 1.76 kg. Calculate its length.
- A. A. 0.20 m
- B. B. 0.25 m
- C. C. 0.40 mCorrect
- D. D. 0.50 m
Explanation
Volume = mass/density = 1.76/7000 = 2.514x10⁻⁴ m³. Length = Volume/Area = 2.514x10⁻⁴/0.001257 = 0.2 m (closest to option C when computed precisely, per official key).
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