Neco 2020 Geography Question 10

Practice objective / multiple choice question 10 from the 2020 Neco Geography examination.

Neco 2020 Geography Objective / Multiple Choice Medium Difficulty
Question 10 NECO • 2020 • GEOGRAPHY • objective

River X is 120 km long and drops 240 m in elevation from source to mouth.\n\n(a) Calculate the average gradient of the river in metres per kilometre.\n\n(b) At a certain cross‑section the discharge is measured as 150 m³ s⁻¹ and the cross‑sectional area is 75 m². Determine the average flow velocity (in m s⁻¹). State whether this velocity exceeds the critical velocity of 1.5 m s⁻¹ and briefly explain what this implies for the river's erosion potential.

Answer Options

A. Gradient = 2 m\/km; Velocity = 1 m\/s (does not exceed critical velocity, indicating low erosion potential)
B. Gradient = 1.5 m\/km; Velocity = 2.5 m\/s (exceeds critical velocity, indicating high erosion potential)
C. Gradient = 2 m\/km; Velocity = 1.8 m\/s (exceeds critical velocity, indicating moderate erosion potential)
Correct Answer D. Gradient = 2 m/km; Velocity = 2 m/s (exceeds critical velocity, indicating high erosion potential)
Correct Answer
D
Correct Option:
Gradient = 2 m/km; Velocity = 2 m/s (exceeds critical velocity, indicating high erosion potential)

About This Question

This is Neco 2020 Geography Question 10. It is one of the objective questions from the 2020 Neco Geography examination.

Difficulty level: Medium .

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