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Cambridge IGCSE Combined Science practice

What is the main reason alloys are harder than pure metals?

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Show answerAlloys and their properties revisionRevise the key idea

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MCQ

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cambridge_mcq

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Topic

Alloys and their properties

Exam-style question

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What is the main reason alloys are harder than pure metals?.

  1. A.They have larger atomic sizes
  2. B.They contain different sized atoms
  3. C.They are made of only one metal
  4. D.They are less dense

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Method

Method for Testing Alloy Hardness

1. Prepare samples of different alloys. 2. Use a hardness tester to measure the hardness of each sample. 3. Record the results in a table. 4. Repeat the test for accuracy.

Alloy TypeHardness (HV)
Steel200
Brass150
Aluminum Alloy100
  1. a

    State the independent variable in this experiment.

    Aim for approximately 1 distinct marking point.

    [1]