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WAEC Physics 2011 Paper

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Question : 18

Total: 49

Which of the following statements about anomalous expansion of water are correct? i. There is contraction between 0^oC and 4^oC. ii. There is expansion between 0^oC and 100^oC. iii. The volume is minimum at 4^oC. iv. The volume is maximum at 4^oC

i and ii only
ii and iii only
i and iii only
ii and iv only

Solution:

Concept:

Anomalous expansion of water means water does not expand uniformly with temperature.

It contracts when heated from

0^{\circ}\mathrm{C}

to

4^{\circ}\mathrm{C}

and expands only after

4^{\circ}\mathrm{C}

.

Explanation:

From

0^{\circ}\mathrm{C}

to

4^{\circ}\mathrm{C}

, water contracts, so its volume decreases.

Therefore, statement i is correct.

At

4^{\circ}\mathrm{C}

, water has its minimum volume and maximum density.

Hence, statement iii is correct, while statement iv is false.

From

4^{\circ}\mathrm{C}

to

100^{\circ}\mathrm{C}

, water expands normally.

Statement ii says expansion occurs throughout

0^{\circ}\mathrm{C}

to

100^{\circ}\mathrm{C}

, which is not fully correct because contraction happens in the first part.

Answer:

The correct statements are i and iii only.

Therefore, the correct option is C.

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