Test Index

JAMB Physics 2013 Paper

Question : 12

Total: 43

Solution:

Concept:

The thermometer scale is uniform, so length is proportional to temperature between the ice point and the steam point.

Explanation:

The ice point is

0^\circ C

and the steam point is

100^\circ C

The distance between these two fixed points is

400 \, \text{mm}

This means

100^\circ C

corresponds to a length of

400 \, \text{mm}

Length per degree Celsius is:

\frac{400 \, \text{mm}}{100^\circ C} = 4 \, \text{mm/}^\circ C

For a temperature of

20^\circ C

, the corresponding length is:

20 \times 4 = 80 \, \text{mm}

So, the correct option is D.

Answer:

80 \, \text{mm}

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