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The toughness of stone is said to be high if the value of the toughness index exceeds __________

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The toughness of stone is said to be high if the value of the toughness index exceeds __________

(a) 7

(b) 13

(c) 15

(d) 19

I got this question by my school teacher while I was bunking the class.

The above asked question is from Stones topic in section Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials

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The correct choice is (d) 19

The explanation: Toughness of stone is said to be high if the value of the toughness index exceeds 19. If it is below 13, then the stone is not tough and if it is between 13 and 19, then the stone is moderately tough.

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