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Hardness of human nail varies between ___________

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Hardness of human nail varies between ___________

(a) 0.5 to 1.5

(b) 3 to 4

(c) 1.5 to 2.5

(d) 2.5 to 3.5

I have been asked this question in a national level competition.

My enquiry is from Physical Properties in portion The Study of Minerals of Engineering Geology

1 Answer

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The correct option is (c) 1.5 to 2.5

For explanation: Some common materials have been assigned hardness values according to Mohs scale and may prove useful in determination of hardness of an unknown mineral quickly. Hardness of human finger nail varies between 1.5 and 2.5.

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