Which one of the following allotropes of carbon is used for cutting and drilling ?

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Q: 68 (CDS-II/2006)
Which one of the following allotropes of carbon is used for cutting and drilling ?
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question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,58,14,58,9,3,2

keywords: 

{'carbon': [1, 0, 4, 5], 'carbon black': [0, 0, 3, 4], 'graphite': [0, 0, 3, 9], 'drilling': [0, 0, 1, 0], 'diamond': [0, 0, 3, 3], 'allotropes': [0, 0, 3, 0]}