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Which of the following is a characteristic of alumina?

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Which of the following is a characteristic of alumina?

(a) Excellent hardness

(b) Good tensile strength

(c) Good toughness

(d) Poor wear resistance

The question was posed to me by my school principal while I was bunking the class.

Question is from Ceramics in portion Non Metallic Materials of Engineering Material & Metallurgy

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Correct choice is (a) Excellent hardness

To elaborate: Aluminum oxide (Al2O3) is regarded as the oldest engineering ceramic. They have excellent hardness and wear resistance. They are stiffer and stronger than steels. Their tensile and toughness properties, however, can be improved by mixing them with zirconium.

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