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WAEC Physics 2022 Paper

Question : 38

Total: 50

Solution:

Concept:

In a mercury thermometer, the length of mercury above the lower fixed point is proportional to the temperature on the Celsius scale.

Explanation:

The lower fixed point is

0^\circ\mathrm{C}

0\ \mathrm{cm}

The upper fixed point is

100^\circ\mathrm{C}

30\ \mathrm{cm}

The mercury level is

10.5\ \mathrm{cm}

above the lower fixed point.

Set up the proportion:

\frac{10.5}{30}=\frac{T}{100}

Cross multiply to solve for

T

10.5 \times 100 = 30T

1050 = 30T

T=\frac{1050}{30}=35.0^\circ\mathrm{C}

Answer:

35.0^\circ\mathrm{C}

Correct option: C.

35.0^\circ\mathrm{C}

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