Question detail

Which of the following is true about gold alloys?

Try the question, check the answer, then read the explanation to understand the curriculum point.

Show answer Topic hub Objective page

At a glance

MCQ

Type

practice

Style

Topic

Using materials

Question

A. They are always 24 carats.
B. They can contain metals such as silver or copper.
C. They are pure gold.
D. They cannot be used in jewelry.

Answer

The correct option is They can contain metals such as silver or copper.. This answer is correct because it matches the approved learning objective to explain carat as a measure of the proportion of gold in an alloy. (Chemistry only; MS 1a, 1c) in the subtopic Alloys as useful materials.

Explanation

The correct option is They can contain metals such as silver or copper.. They can contain metals such as silver or copper. is correct because it directly supports the approved learning objective to explain carat as a measure of the proportion of gold in an alloy. (Chemistry only; MS 1a, 1c). This belongs to the subtopic Alloys as useful materials within Using materials, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Alloys as useful materials.

Common mistake

Confusing Carat with Weight

Students often confuse carat, which measures the proportion of gold in an alloy, with the weight of the gold itself.

Clarify that carat refers to the purity of gold in an alloy, expressed as a fraction of 24 parts, rather than the weight of the gold.

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