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Which of the following is used as a criterion in quality control?

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Which of the following is used as a criterion in quality control?

(a) X-ray diffraction

(b) Mechanical testing

(c) Wetting properties

(d) Spectral analysis

The question was posed to me in an interview for job.

This key question is from Characterisation of Polymer Samples in section Polymers of Engineering Chemistry I

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The correct option is (b) Mechanical testing

Explanation: Mechanical testing is used as a criterion in quality control. It shows whether a material or part is suitable for its intended application by measuring properties such as elasticity, hardness, fracture toughness, impact resistance, and the fatigue limit.

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