Graphene is frequently in news recently. What is its importance? 1. It is a two-dimensional material and has good electrical conductivity. 2. It is one of the thinnest but strongest materials tested so far. 3. It is entirely made of silicon and has high optical transparency. 4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs. Which of the statements given above are correct?
A1 and 2 only
B3 and 4 only
C1, 2 and 4 only
D1, 2, 3 and 4
Answer & Solution
Correct answer: C. 1, 2 and 4 only
UPSC CSE Prelims 2012 (GS-I, Set A), Q.14. Answer key: C (coaching consensus; UPSC did not publish an official 2012 AK separately on upsc.gov.in).
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