The material which practically does not show elastic after effect is [JIPMER 1997; AMU (Engg.) 1999]
A) Copper B) Rubber C) Steel D) Quartz
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Answer: d) Quartz
Explanation: The time delay in which the substance regains its original condition after the removal of deforming force is called elastic after effect. It is the time for which restoring forces are present after the removal of the deforming force it is negligible for perfectly elasticsubstance, like quartz, phosphor bronze and large for glass fibre.
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