Ballast best suited to steel sleepers is
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sand
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gravel
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quartzite
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All the above
C
Correct answer
Explanation
Quartzite ballast is best suited for steel sleepers because of its high hardness, angular particle shape, and excellent interlocking properties. Steel sleepers can crush softer ballast materials like sand or gravel, but quartzite maintains its integrity and provides stable support even under steel sleeper loads.