Which one of the following materials is very hard and very ductile ?

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Q: 109 (IAS/2000)
Which one of the following materials is very hard and very ductile ?
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question_subject: 

Science

question_exam: 

IAS

stats: 

0,25,62,14,36,12,25

keywords: 

{'materials': [0, 1, 1, 0], 'ductile': [0, 1, 0, 0], 'tungsten': [0, 0, 0, 2], 'cast iron': [0, 0, 1, 0], 'carborundum': [0, 0, 0, 1], 'nichrome': [0, 1, 1, 1]}