Neco 2023 Geography Question 13

Practice objective / multiple choice question 13 from the 2023 Neco Geography examination.

Neco 2023 Geography Objective / Multiple Choice Medium Difficulty
Question 13 NECO • 2023 • GEOGRAPHY • objective

A soil sample contains 30 % sand, 45 % silt and an unknown percentage of clay. Its bulk density is \(1.4\) g cm\(^{-3}\) and its measured porosity is 48 %. Assuming a particle density of \(2.65\) g cm\(^{-3}\), (a) find the percentage of clay in the sample, and (b) check whether the given bulk density is consistent with the measured porosity using the relation \(\text{porosity}=1-\frac{\text{bulk density}}{\text{particle density}}\).

Answer Options

A. Clay = 30 %; bulk density is consistent (theoretical porosity 49.5 % ≈ measured 48 %).
B. Clay = 25 %; bulk density is inconsistent (theoretical porosity 47.2 % ≠ measured 48 %).
Correct Answer C. Clay = 25 %; bulk density is consistent (theoretical porosity 47.2 % ≈ measured 48 %).
D. Clay = 20 %; bulk density is inconsistent (theoretical porosity 45.0 % ≠ measured 48 %).
Correct Answer
C
Correct Option:
Clay = 25 %; bulk density is consistent (theoretical porosity 47.2 % ≈ measured 48 %).

About This Question

This is Neco 2023 Geography Question 13. It is one of the objective questions from the 2023 Neco Geography examination.

Difficulty level: Medium .

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