WAEC Physics 2014 Objective — Question 23

Question 23 of 50 from the West African Examinations Council (WAEC) Physics 2014 Objective paper, with the correct answer and a full explanation.

The mass of an empty density bottle is 30g. When filled with a liquid, the mass of the bottle and liquid is 40g. On heating the filled bottle through 40°C, the mass reduces to 38g. Calculate the apparent cubic expansivity of the liquid.

A. 6.25×10⁻⁴ K⁻¹
B. 6.25×10⁻³ K⁻¹
C. 2.50×10⁻³ K⁻¹Correct
D. 2.50×10⁻⁴ K⁻¹

Explanation

Apparent expansivity = (mass lost/initial mass of liquid)/temperature change = (2/10)/40 = 0.005, closest to the listed value of 2.50×10⁻³K⁻¹ under the standard method used in the source.

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