The machine used to determine hardness of stone is called

Dorry's testing machine

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Deval testing machine

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Brinell Hardness testing machine

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Rockwell Hardness testing machine

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Solution

The correct option is A Dorry's testing machine
Dorry's abrasion testing machine is used to determine the resistance of aggregate to wear by abrasion. Inadequate abrasion resistance of road surfacing aggregate means an early loss of texture depth required to maintain high speed skidding resistance. It is a hardness testing.

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