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WAEC Physics 2018 Paper

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Question : 18

Total: 50

The diagram above illustrates the mercury-in-glass thermometer used for determining the temperature of a room. Use the data on it to determine the room temperature.

3.3°C
7.0°C
13°C
30.0°C

Solution:

Let the room temperature be X.

We have, $\; \frac{3-0}{10-0} = \; \frac{X-0}{100-0}$

$\; \frac{3}{10} = \; \frac{X}{100}$

$X = \; \frac{3 \times 100}{10}$

= 30°C

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