The magnetic bearing between two points on the topographical map was 326°37' for the year 2010 - NSC Geography - Question 2 - 2016 - Paper 2
Question 2
The magnetic bearing between two points on the topographical map was 326°37' for the year 2010.
2.1.1 Will the magnetic bearing for 2016 between the same two points... show full transcript
Worked Solution & Example Answer:The magnetic bearing between two points on the topographical map was 326°37' for the year 2010 - NSC Geography - Question 2 - 2016 - Paper 2
Step 1
2.1.1 Will the magnetic bearing for 2016 between the same two points be larger or smaller?
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Answer
The magnetic bearing for 2016 will be larger. This is due to the annual change in the magnetic declination, which is approximately 3° West per year, resulting in an increase in the bearing.
Step 2
2.1.2 Give a reason for your answer to QUESTION 2.1.1.
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Answer
The reason is that the magnetic declination has changed over the years, causing a shift in the magnetic north. For 2016, the bearing will reflect this change, leading to a larger value compared to 2010.
Step 3
2.2 Calculate the area of the cultivated lands, area P in block F4 on the topographical map.
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Answer
To calculate the area, we must first determine the length (L) and breadth (B) from the map. Assume:
Length (L) = 0.5 km
Breadth (B) = 0.3 km
Using the formula, area = length × breadth:
Area = 0.5 km × 0.3 km = 0.15 km².
Step 4
2.3.1 Match the gradients 1:24 and 1:58 with slopes 5 and 6 on the orthophoto map.
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Slope 5: 1:24
Slope 6: 1:58
Step 5
2.3.2 (a) Which ONE of the two gradients, 1 : 24 or 1 : 58, is the steeper?
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Answer
The gradient 1:24 is the steeper of the two.
Step 6
2.3.2 (b) Interpret the ratio of the gradient selected in QUESTION 2.3.2(a).
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The ratio 1:24 means that for every 1 unit of vertical ascent, there is a 24 unit horizontal distance. This indicates a relatively steep slope.
Step 7
2.4.1 Indicate the following features on the cross-section using the key indicated in brackets next to the feature:
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(a) Δ235 (T)
(b) Secondary road (S)
(c) Marsh and vlei (M) located corresponding to the heights indicated on the cross-section.
Step 8
2.4.2 Give ONE reason why a person standing at Q will NOT be visible to a person standing at R.
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A person standing at Q will not be visible to a person at R due to the presence of higher terrain or obstacles in between, such as hills or structures that block the line of sight.
Step 9
2.4.3 (a) Give the vertical scale of the cross-section as a ratio scale.
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The vertical scale of the cross-section is 1:2000.
Step 10
2.4.3 (b) Determine the vertical exaggeration (VE) of the cross-section.
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