WAEC Physics 2014 Objective — Question 13
Question 13 of 50 from the West African Examinations Council (WAEC) Physics 2014 Objective paper, with the correct answer and a full explanation.
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Alcohol of mass 21g and density 0.7g cm⁻³ is mixed with 10g of water. Determine the density of the mixture. [Density of water = 1.0 g cm⁻³]
- A. 0.775 g cm⁻³Correct
- B. 0.780 g cm⁻³
- C. 0.875 g cm⁻³
- D. 0.880 g cm⁻³
Explanation
Volume of alcohol = 21/0.7 = 30cm³. Volume of water = 10/1.0 = 10cm³. Total volume = 40cm³, total mass = 31g. Density = 31/40 = 0.775 g cm⁻³.
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