Q: 30 (NDA-I/2013)
question_subject:
Science
question_exam:
NDA-I
stats:
0,17,50,21,12,14,20
keywords:
{'carbon': [1, 0, 4, 5], 'graphite': [0, 0, 3, 9], 'fullerene': [0, 0, 0, 5], 'charcoal': [1, 1, 1, 4], 'pure form': [0, 0, 0, 1], 'diamond': [0, 0, 3, 3]}
The pure form of carbon refers to carbon in its elemental form, which can take on several different structures or allotropes. The four options given in this multiple-choice question represent four different allotropes of carbon:
- Diamond: a crystalline form of carbon that is extremely hard and has high thermal conductivity. It is often used in jewelry and cutting tools.
- Graphite: a soft, black, flaky material used in pencils and as a lubricant. It is also used in batteries, fuel cells, and other industrial applications.
- Charcoal: a porous, black material produced by heating wood or other organic materials in the absence of air. It is used as a fuel and as a component in art supplies.
- Fullerene: a molecule composed entirely of carbon, typically in the form of a hollow sphere, ellipsoid, or tube. It has potential applications in electronics, medicine, and other fields.
Of these options, the correct answer to the question is "diamond".