In which of the following substances, elastic-after-effect is negligible :

Quartz

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Phosphor Bronze

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Silver

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All of the above

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Solution

The correct option is D All of the above
Elastic-after-effect is the delay of the material to region its shape after being deformed, within its elastic limit.
In quartz, Phosphor bronze, silver this delay is zero because they can't regain their shape after being deformed. So, elastic-after-effect is negligible.

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Variable	Baseline values	Values after injecting substance A	Values after injecting substance B	Values after injecting substance C	Values after injecting substance D
Serum ${C a}^{+ +}$	2.3mmol/L	2.3mmol/L	2.3mmol/L	3.0mmol/L	2.3mmol/L
Serum ${N a}^{+}$	135mmol/L	135mmol/L	135mmol/L	136mmol/L	135mmol/L
Serum glucose	5.6mmol/L	3.3mmol/L	5.6mmol/L	7.4mmol/L	5.6mmol/L

Variable	Baseline values	Values after injecting substance A	Values after injecting substance B	Values after injecting substance C	Values after injecting substance D
Serum ${C a}^{+ +}$	2.3mmol/L	2.3mmol/L	3.0mmoL/L	2.3mmol/L	2.3mmol/L
Serum ${N a}^{+}$	135mmol/L	135mmol/L	136mmol/L	135mmol/L	135mmol/L
Serum glucose	5.6mmol/L	3.3mmol/L	5.6mmol/L	7.4mmol/L	5.6mmol/L

Which of the following substances expands/contracts negligibly on heating?.

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