Question

Match the LIST-I with LIST-II 

LIST-I	LIST-II
A. Field emission	I. detector of gases
B. Chemical sensor	II. strength of plastic composites
C. Mechanical Reinforcement	III. serve as heat sink
D. Computer	IV. flat panel display

Choose the correct answer from the options given below:

• A. A - I, B - II, C - III, D - IV
• B. A - II, B - III, C - IV, D - I
• C. A - IV, B - III, C - II, D - I
• D. A - IV, B - I, C - II, D - III

Hint:

Associate key properties of carbon nanotubes with their applications:

High aspect ratio (long and thin) \(\rightarrow\) Field Emission (Displays)
High surface area \(\rightarrow\) Chemical Sensing
High strength \(\rightarrow\) Composites
High thermal conductivity \(\rightarrow\) Heat Sinks

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
This question requires matching various phenomena or applications of nanomaterials (specifically, likely carbon nanotubes) with their correct description or use case.
Step 2: Detailed Explanation:


A. Field emission: Materials with a high aspect ratio and sharp tips, like carbon nanotubes, are excellent field emitters. They can emit electrons under a relatively low electric field. This property is utilized in developing flat panel displays. Thus, A matches IV.
B. Chemical sensor: Nanomaterials have an extremely high surface-area-to-volume ratio. This makes their electrical properties very sensitive to the adsorption of molecules from the environment. This sensitivity is exploited to create highly effective chemical sensors, for example, a detector of gases. Thus, B matches I.
C. Mechanical Reinforcement: Carbon nanotubes possess extraordinary tensile strength and stiffness. When embedded into a polymer matrix, they can significantly increase the strength of plastic composites. Thus, C matches II.
D. Computer: This is a broad term. A key challenge in modern computers is heat dissipation from processors. Materials with high thermal conductivity, like carbon nanotubes and other nanomaterials, can be used to create better thermal interface materials or integrated heat spreaders. In this context, they can serve as a heat sink. Thus, D matches III.

Step 3: Final Answer:
The correct matching is A-IV, B-I, C-II, D-III.