Mapwork

On a 1:50 000 map

• 1 cm represents 5000 metres

• 1 cm represents 50 metres

• 1 cm represents 500 metres

• 1 cm represents 5 metres

The contour interval on a 1: 50 000 SA topographic map is....

• 20 m

• 50 m

• 5 m

• 20 ft

This symbol on a topographic map represents

• orchards

• cultivated land

• green belt

• Forestry

This symbol on a SA topographic map represents

• A secondary road

• a railway line

• a power line

• a national freeway

Average gradient can be written as .....

• Difference height : Horizontal distance

• Difference in height ÷ Horizontal distance

• Horizontal difference: Vertical distance

• Average length x average width

The area of a city block on a 1:50000 map which measures 0.8 cm by 0.4 cm would be

• 80 ha

• 8 ha

• 80000 ha

• 800 ha

What would the average gradient between Spot height 1250 and Spot height 610 be on a 1:50000 topo map. The two spot heights are 8.2 cm apart on the map.

• 1: 62

• 1.12.4

• 1;6.4

• 1: 0.156

A plane flying due west would be flying on a true bearing of .....

• 90 degrees west

• 180 degrees

• 270 degrees

• 45 degrees west

If the magnetic declination for a map is 17°15' W and a plane is flying on a True bearing of 25° its magnetic bearing would be....

• 42°15'

• 17°15'

• 27°45'

• 332°45'

If the magnetic declination for a map was 15° 42' W in 2014 and the mean annual change is 4' E the magnetic declination for that map would be ......... in 2020

• 15° 42' W

• 15° 10' W

• 16° 12' W

• 15° 42' E