UPSC Prelims 2012·GS1·science-and-technology·materials and robotics

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?

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Last updated 23 May 2026, 3:31 pm IST
  1. A1 and 2 only
  2. B3 and 4 only
  3. C1, 2 and 4 onlyCorrect
  4. D1, 2, 3 and 4

Explanation

The correct option is C because of the following reasons: Statement 1 is correct. Graphene is a single layer of carbon atoms arranged in a hexagonal lattice, making it a two dimensional material. It is an excellent conductor of electricity, even better than copper. Statement 2 is correct. It is only one atom thick, making it the thinnest material known, yet it is about 200 times stronger than steel. Statement 3 is incorrect. Graphene is an allotrope of carbon, not silicon. While it does have high optical transparency, the mention of silicon makes this statement false. Statement 4 is correct. Because graphene is thin, strong, transparent, and highly conductive, it is an ideal material for use as transparent conducting electrodes in touch screens, LCDs, and OLEDs. Since statements 1, 2, and 4 are true and statement 3 is false, the correct answer is C.
science-and-technology: Graphene is frequently in news recently. What is its importance? 1. It is a two-dimensional material and has good electr
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