UPSC CSE Prelims
Nanomaterials Previous Year Questions (PYQs)
Practice solved questions for Nanomaterials with detailed step-by-step solutions, key insights, and trend analysis for UPSC CSE PRELIMS.
Solved Previous Year Questions
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Graphene is frequently in the news recently. What is its importance?
- It is a two-dimensional material and has good electrical conductivity
- It is one of the thinnest but strongest materials tested so far
- It is entirely made of silicon and has high optical transparency
- It can be used as ‘conducting electrodes’ required for touch screens, LCDs and organic LEDs
Detailed Explanation:
✅ Statement 1 – Correct: Graphene is a two-dimensional material consisting of a single layer of carbon atoms arranged in a hexagonal lattice, and it exhibits excellent electrical conductivity due to the mobility of electrons in its structure.
✅ Statement 2 – Correct: Graphene is one of the thinnest materials (only one atom thick) yet possesses extraordinary tensile strength — approximately 200 times stronger than steel — making it one of the strongest materials tested.
❌ Statement 3 – Incorrect: Graphene is composed entirely of carbon atoms, not silicon. However, it does possess high optical transparency (absorbs only ~2.3% of visible light).
✅ Statement 4 – Correct: Due to its combination of electrical conductivity, optical transparency, and flexibility, graphene is highly suitable for use as conducting electrodes in touch screens, LCDs, and organic LEDs.
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