neco 2018 geography | Practical

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Question 1 View Details
A topographic map of the Riverine region is provided. The map scale is 1 cm : 250 m and the contour interval is 20 m. Two villages, A and B, are shown on a road that follows the slope of a hill. The horizontal distance measured on the map between the villages is 6.5 cm. The spot heights are: Village A – 140 m, Village B – 200 m.
Question Parts
(a)
Calculate the actual horizontal distance between the villages in kilometres.
(b)
Determine the average gradient of the road between the villages expressed as (i) a percentage and (ii) a ratio (vertical : horizontal).
(c)
A vehicle travels on level ground at 40 km/h but its speed reduces by 0.5 km/h for each percent increase in gradient. Estimate the time taken to travel from A to B along the road.
(d)
State two possible sources of error that could affect the gradient calculation.
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Question 2 View Details
A rectangular agricultural field is shown on a plan drawn at a scale of 1 cm : 20 m. On the plan the length of the field measures 12.3 cm and its width 8.7 cm. The farmer intends to cultivate the field with maize. The recommended seeding rate for maize is 25 kg per hectare and seed is sold in 50‑kg bags.
Question Parts
(a)
Calculate the actual area of the field in hectares.
(b)
Determine the total quantity of seed required (in kilograms) for the field.
(c)
How many 50‑kg bags of seed should the farmer purchase? (Round up to the nearest whole bag.)
(d)
If the farmer expects a 10 % loss of seed due to spillage and uneven distribution, how many additional kilograms of seed should be added to the total requirement calculated in (b)?
(e)
Suggest one practical method to minimise seed loss during sowing.
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Question 3 View Details
The following coordinates of three Nigerian towns are given: - Town A: 5°N, 7°E - Town B: 2°S, 10°W - Town C: 8°N, 3°E A map with a scale of 1 cm = 200 km is provided for the exercise. Using the data above, answer the questions that follow.
Question Parts
(a)
Calculate the straight‑line distance between Town A and Town C. Show the intermediate north‑south and east‑west components, then give the distance on the map in centimetres (to one decimal place).
(b)
Determine the time difference between Town A and Town B based on their longitudes. State which town is ahead and give the difference in hours, minutes and seconds.
(c)
Estimate the initial bearing (azimuth) that a traveller would follow when moving from Town A to Town B using the formula \(\theta = \tan^{-1}\left(\frac{\Delta \lambda \cos \phi_{avg}}{\Delta \phi}\right)\). Give the bearing in degrees (to the nearest degree) measured clockwise from true north.
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Question 4 View Details
A group of students recorded daily weather observations at the school for five consecutive days. The data are shown in the table below. | Day | Temperature (°C) | Relative Humidity (%) | Atmospheric Pressure (hPa) | Wind Speed (km/h) | |-----|------------------|-----------------------|----------------------------|-------------------| | 1 | 28 | 65 | 1012 | 12 | | 2 | 30 | 70 | 1010 | 15 | | 3 | 27 | 80 | 1008 | 10 | | 4 | 31 | 60 | 1013 | 20 | | 5 | 29 | 75 | 1009 | 8 | Answer the following questions based on the above observations.
Question Parts
(a)
Calculate the mean, median and range of the temperature readings for the five days.
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