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JAMB Geography 2012 Paper

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Question : 1

Total: 45

The length between two points on a topographical map is 5m. What is the actual distance between them if the scale of the map is 1:50000?

2.5 km
3.0 km
3.5
5.0

Solution:

Concept:

Scale of

1:50000

means 1 unit on the map represents 50,000 of the same units on the ground.

Explanation:

The map distance is taken as

5\ \mathrm{cm}

, since

5\ \mathrm{m}

would give

250\ \mathrm{km}

, which is not among the options.

Actual distance

= 5\ \mathrm{cm} \times 50000 = 250000\ \mathrm{cm}

.

Convert to kilometres:

250000\ \mathrm{cm} = 2.5\ \mathrm{km}

.

Answer:

A. 2.5 km

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