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Toughness index of a good stone should be more than:(a) 17(b) 18(c) 13(d) 19I had been asked this question during an internship interview.Asked question is from Properties of Stones in portion Materials for Construction of Basic Civil Engineering

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Right ANSWER is (d) 19

For EXPLANATION I would say: Toughness is the ability to resist impact FORCES. A good building stone should have high toughness index to resist VIBRATIONS from MACHINERY, moving loads, etc…



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