GEOGRAPHY 2240 (was 242) Sample Test Answers

Sample Test Answers

(answers are in this colour)

PART 1: Fill in the blanks in the following tables:

Scale: 4 marks

scale of the map	distance measured on the map	distance measured on the ground	percentage change in size of map*	new scale of the map**
1:175000	8.5 cm	175000 x 8.5 cm = 1487500 cm or 14.875 km	125%	(1 x 1.25) / 175000 = 140000 scale = 1:140000
1:345000	7.9 km / 345000 = 0.0000228 km or 22.8 mm	7.9 km	200%	(1 x 2.00) / 345000 = 172500 scale = 1:172500
3.4 cm / 27.5 km = 3.4 cm / 2750000 cm = 1:808824	3.4 cm	27.5 km	80%	(3.4 x 0.8) / 2750000 = 1011029 scale = 1:1011029
1:25000000	31 mm	25000000 x 31 mm = 775000000 mm or 775000 m or 775 km	25000000 / 30000000 = 25/30 = 0.83 change = 83%	1:30000000
5.5 cm / 22.5 km = 5.5 cm / 2250000 cm = 1:409091	5.5 cm	22.5 km	409091 / 150000 = 2.73 change = 273%	1:150000
1:400000	17 km / 400000 = 0.0000425 km or 42.5 mm	17.0 km	67%	(1 x 0.67) / 400000 = 597015 scale = 1:597015
1:50000	55 mm	50000 x 55 mm = 2750000 mm or 2.75 km	120%	(1 x 1.2) / 50000 = 41667 scale = 1:41667
1:100000	45 km / 100000 = 0.00045 km or 45 cm	45 km	100000 / 50000 = 10/5 = 2 change = 200%	1:50000

Directions: 6 marks

azimuth	bearing
43^o	N 43^o E
348^o (360 - 12)	N 12^o W
125.5^o	S 54.5^o E (180 - 125.5)
144^o 40' (180 - 35^o 20')	S 35^o 20' E
317^o 30'	N 42^o 30' W (360 - 317^o 30')
246.5^o (180 + 66.5^o)	S 66.5^o W

magnetic declination in 1939 (E or W of True North)	annual change	magnetic declination in 1945 (E or W of True North)	magnetic azimuth measured in 1945	true north azimuth
4^o 25' W	+ 3'	4^o 43' W (4^o 25' + 18') change = + 18' (3'/year x 6 years)	103^o 00'	98^o 17' (103^o 00' - 4^o 43')
12^o 20' E	- 1'	12^o 14' E (12^o 20' - 6') change = - 6' (-1'/year x 6 years)	226^o 30'	238^o 44' (226^o 30' + 12^o 14')
4^o 15' E	+ 5'	4^o 45' E (4^o 15' + 30') change = + 30' (5'/year x 6 years)	13^o 15' (18^o 00' - 4^o 45')	18^o 00'

Proportional Symbols: 10 marks

Column/prism/flow maps (linear proportionality & divided symbols)

largest symbol size	maximum value in data set	value to be represented on the map	size of that symbol	value of subdivision in data set	size of subdivision of symbol
3 cm	500000	130000	0.78 cm (3 cm x 130000/500000)	95000	0.57 cm (3 cm x 95000/500000)
2.5 cm	740	520	1.76 cm (2.5 cm x 520/740)	330	1.115 cm (2.5 cm x 330/740)
1.5 cm	122000	89467 (122000 x 1.10/1.5)	1.10 cm	61000 (122000 x 0.75/1.5)	0.75 cm
2.0 cm	35500	15975 (35500 x 0.9/2.0)	0.9 cm	7988 (35500 x 0.45/2.0)	0.45 cm

Proportional symbol maps (area proportionality)

largest symbol width	maximum value in data set	value to be represented	width of symbol
3 cm	22000 square root = 148.32	14500 square root = 120.42	2.44 cm = 3.0 cm x (120.42 / 148.32)
2.5 cm	1945000 square root = 1394.63	526000 (1.3 / 2.5) x 1394.63 = 725.21 725.21² = 526000	1.3 cm
2.0 cm	7700 square root = 87.75	5700 square root = 75.50	1.72 cm = 2.0 cm x (75.50 / 87.75)