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The __________ is a bad conductor of heat and it is also non-combustible building material.

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The __________ is a bad conductor of heat and it is also non-combustible building material.

(a) Sandstone

(b) Granite

(c) Stone

(d) Limestone

The question was asked during an interview for a job.

My doubt is from Fire Resisting Materials topic in division Fire Protection in Building, Carpentry and Joinery of Construction & Building Materials

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Correct answer is (c) Stone

Explanation: The stone is also liable to disintegrate into small pieces when heated and suddenly cooled. The granite explodes and gets easily disintegrated in case of a fire. The limestone is easily crumbled even by ordinary fire.

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