0654.C9.5.04 — Describe the use of zinc in galvanising steel as an example of a barrier method and sacrificial protection: past paper questions
Real questions on 0654.c9.5.04 — describe the use of zinc in galvanising steel as an example of a barrier method and sacrificial protection
The newest 5 of 5 written questions. Open one to see it on the real paper.
- 0654/33 · May/June 2025 · Q7d(i)[1]
State what is meant by an alloy.
See it on the paper → - 0654/33 · May/June 2025 · Q7d(ii)[1]
Fig. 7.1 shows four structures W, X, Y and Z. W X Y Z Fig. 7.1 State which structure best represents an alloy. structure
See it on the paper → - 0654/33 · May/June 2021 · Q2e(ii)[1]
The alloy is used in aircraft bodies. Suggest why the alloy of magnesium is used rather than pure magnesium for aircraft bodies.
See it on the paper → - 0654/33 · October/November 2019 · Q5a(i)[1]
State the term used for a mixture of metals.
See it on the paper → - 0654/43 · May/June 2019 · Q11d(ii)[1]
Explain why aluminium appears to be resistant to corrosion.
See it on the paper →
What examiners said
Candidates often expressed part of the meaning: that an alloy is a mixture or that it is a metal. A number misused the term element, describing an alloy as an element made of metals. Despite these mistakes a good number were able to link the ideas and give a complete answer to gain the mark.
— Examiner report, May/June 2025, 0654/33 Q7(d)(i) (Cambridge)
Most candidates could state that alloys used in aircraft were likely to be stronger and less dense than pure magnesium.
— Examiner report, May/June 2021, 0654/33 Q2(e)(ii) (Cambridge)
Alloy was not well known. Compound was a common incorrect answer.
— Examiner report, October/November 2019, 0654/33 Q5(a)(i) (Cambridge)
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