Q.

Of the following commonly used materials, the one that is not an alloy is -

A. Steel
B. Brass
C. Bronze
D. Copper
Answer» D. Copper
Explanation: Copper is not an alloy; it is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. It is used as a constituent of various metal alloys, such as sterling silver used in jewellery, cupronickel used to make marine hardware and coins, and constant an used in strain gauges and thermo- couples for temperature measurement.
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