Multiple choice

Which one of the following materials is very hard and very ductile?

  1. Carborundum

  2. Tungsten

  3. Cast iron

  4. Nichrome
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D Correct answer
Explanation

Nichrome is an alloy of nickel and chromium that is both hard and ductile, making it useful for heating elements. Carborundum is extremely hard but brittle. Tungsten is very hard but has limited ductility at room temperature. Cast iron is hard but brittle.

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