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 ?

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]}

The correct option is 1, Diamond. Diamond is an allotrope of carbon that is extremely hard and has a unique crystal structure. Its hardness and heat resistance make it ideal for cutting and drilling applications.

Option 2, Graphite, is another allotrope of carbon but it is not suitable for cutting and drilling. Graphite has a layered structure and is known for its lubricating properties. It is used in pencils and as a lubricant.

Option 3, Activated carbon, is a form of carbon that has been treated to have a high surface area. It is commonly used for its adsorption properties, such as in water and air purification systems.

Option 4, Carbon black, is a form of carbon that is produced by the incomplete combustion of hydrocarbons. It is commonly used as a pigment and reinforcing filler in rubber and plastic products.

In summary, out of the given options, Diamond is the correct allotrope of carbon used for cutting and drilling.