Neco 2023 Geography Question 14

Practice objective / multiple choice question 14 from the 2023 Neco Geography examination.

Neco 2023 Geography Objective / Multiple Choice Medium Difficulty
Question 14 NECO • 2023 • GEOGRAPHY • objective

A rock sample consists of 55 % quartz (Mohs hardness 7), 30 % feldspar (hardness 6) and 15 % mica (hardness 2.5) by volume. A geologist scratches the sample with a reference mineral of hardness 5.5 and observes that 40 % of the sample surface is scratched. Assuming the proportion scratched is directly proportional to the volume fraction of minerals softer than the reference, is the observed scratch percentage consistent with the mineral composition? Show your calculation.

Answer Options

Correct Answer A. No; expected scratched proportion is 15 % but 40 % was observed, so the result is inconsistent.
B. Yes; expected scratched proportion is 40 % and 40 % was observed, so the result is consistent.
C. No; expected scratched proportion is 25 % but 40 % was observed, so the result is inconsistent.
D. Yes; expected scratched proportion is 30 % but 40 % was observed, so the result is consistent.
Correct Answer
A
Correct Option:
No; expected scratched proportion is 15 % but 40 % was observed, so the result is inconsistent.

About This Question

This is Neco 2023 Geography Question 14. It is one of the objective questions from the 2023 Neco Geography examination.

Difficulty level: Medium .

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