WAEC Physics 2017 Objective — Question 16

Question 16 of 50 from the West African Examinations Council (WAEC) Physics 2017 Objective paper, with the correct answer and a full explanation.

A thermometer records 680 mmHg at steam point and 440 mmHg at ice point. The temperature it records at 380mmHg is

A. A. -25°C
B. B. -20°CCorrect
C. C. 20°C
D. D. 25°C

Explanation

Using (100-X)/(100-0) = (680-380)/(680-440): 100-X = ((680-380)x100)/(680-440) = (300x100)/240 = 125; X = 100-125 = -25°C. (Note: the official answer key states B, -20°C.)

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