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.

  • A 3.3°C
  • B 7.0°C
  • C 13°C
  • D 30.0°C
waec 2018physics

The correct answer is D. 30.0°C

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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