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Why do metals contract and expand?(a) Due to cooling and heating(b) Due to displacement(c) Due to repairs(d) Due to false recognitionI have been asked this question in an interview.The question is from Physical Terms and Test Terms in section Physical Test & Heat Treatment Terms of Aerospace Materials & Processes

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Right ANSWER is (a) Due to cooling and HEATING

Best explanation: The cooling and heating of metals causes CONTRACTION and expansion respectively. That is the reason why railway tracks EXPAND in SUMMER.



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