neco 2021 geography | Practical

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Question 1 View Details
A topographic map of a region is drawn at a scale of 1 cm : 500 m. The map shows two towns, A and B. Using a ruler, the straight‑line distance between A and B on the map is measured as 8.4 cm. The road between the towns follows a gentle curve that is approximately three times the straight‑line distance on the map. A vehicle travels from A to B along the road at an average speed of 45 km/h.
Question Parts
(a)
Calculate the actual straight‑line distance between A and B in kilometres.
(b)
Estimate the actual road distance between A and B in kilometres.
(c)
Determine the approximate travel time (in minutes) required to go from A to B along the road at the given speed.
(d)
If a new road is constructed that follows the straight line, by what percentage would the travel time be reduced compared with the existing road? (Assume the same speed.)
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Question 2 View Details
A map of a lake is drawn at a scale of 1 cm : 250 m. The lake has an irregular outline. A 1 cm × 1 cm grid is superimposed on the map. Within the outline the student counts 34 full squares and 12 half squares.
Question Parts
(a)
Calculate the actual area of the lake in square kilometres.
(b)
If the average depth of the lake is 5.6 m, estimate the volume of water in cubic metres.
(c)
The lake loses water through evaporation at a rate of 1.2 mm per day. Estimate the daily volume of water lost in cubic metres.
(d)
Suggest one practical method to reduce evaporation loss and briefly explain why it would be effective.
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Question 3 View Details
Two towns are located at the following geographical coordinates: Town X: 6° 45' 30" N, 3° 12' 15" E Town Y: 7° 10' 20" N, 3° 45' 50" E The map used for the survey has a scale of 1 cm : 20 km. Answer the following:
Question Parts
(a)
Convert the coordinates of both towns to decimal degrees (to four decimal places).
(b)
Using the average latitude of the two towns, estimate the straight‑line distance between them. (Take 1° latitude ≈ 111 km and 1° longitude ≈ 111 km × cos (mean latitude)). Give the answer in kilometres, rounded to the nearest kilometre.
(c)
State the distance between the two towns on the map in centimetres.
(d)
Mention one possible source of error that could affect the distance obtained in part (b).
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Question 4 View Details
A weather station network recorded the following observations on the same day: | Station | Altitude (m) | Observed pressure (hPa) | Temperature (°C) | |---------|--------------|------------------------|-------------------| | A | 500 | 1005 | 20 | | B | 0 | 1012 | 22 | | C | 1500 | 998 | 15 | The sea‑level pressure (P₀) can be estimated from the observed pressure (P) using the formula: P₀ = P × e^(g h / (R T)) where g = 9.8 m s⁻², R = 287 J kg⁻¹ K⁻¹ and T is the absolute temperature in kelvin. Answer the following:
Question Parts
(a)
Calculate the sea‑level pressure for each station. Give your answers in hPa, rounded to the nearest whole number.
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