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WAEC Physics 2018 Paper

Question : 13

Total: 50

Solution:

Concept:

Water has its maximum density at

4^\circ\mathrm{C}

, so the density-temperature graph must show a peak at that temperature.

Explanation:

When water is heated from

0^\circ\mathrm{C}

4^\circ\mathrm{C}

, it contracts, causing its density to increase.

Above

4^\circ\mathrm{C}

, water expands on heating, so its density decreases.

Therefore, the correct graph rises to a maximum at

4^\circ\mathrm{C}

and then falls.

Answer:

A. I

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