Graphene is frequently in the 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.

2012

“Nanotechnology,Carbon”, Science and Technology

Graphene is frequently in the 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.

(a)

1 and 2 only

(b)

3 and 4 only

(c)

1, 2 and 4 only

(d)

1, 2, 3 and 4

Answer:

(c)

Core Books/NCERT

Explanation

Statement 1 is correct: Graphene is a 2D material with excellent electrical conductivity. Statement 2 is correct: It is both the thinnest and one of the strongest materials. Statement 3 is incorrect: Graphene is made of carbon, not silicon. Statement 4 is correct: Graphene can be used as conducting electrodes in various electronic devices.