UPSC CSE Prelims
Question 29
Graphene is frequently in 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.
Which of the statements given above are correct?
View correct answer and explanation
Correct answer: C
Correct Option: C
Explanation: Graphene is a single layer of carbon atoms combining high conductivity, strength and transparency, useful in flexible electronic electrodes.
Statement/Item-wise Analysis:
1: Correct - Its carbon honeycomb lattice is effectively two-dimensional and conductive.
2: Correct - Graphene has exceptional tensile strength despite being atomically thin.
3: Incorrect - Graphene is carbon, not silicon.
4: Correct - Transparent conductive electrodes are a plausible application in touchscreens/displays.
Option-wise Analysis:
A: Incorrect - omits correct item 4.
B: Incorrect - includes incorrect item 3; omits correct items 1, 2.
C: Correct - includes exactly the valid statements/items and excludes the invalid ones.
D: Incorrect - includes incorrect item 3.