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Question

Difficulty: MediumSelecting the Best Title

Discovered accidentally in the late 1950s by naval researchers, Nitinol is a unique alloy of nickel and titanium that exhibits shape-memory properties. When deformed at room temperature, the metal retains its bent form until it is heated above a specific transition temperature, causing it to snap back to its original pre-formed shape. This reversible crystalline transformation occurs because heating rearranges the alloy’s atomic lattice without breaking chemical bonds. Today, Nitinol’s thermal elasticity makes it invaluable for manufacturing medical stents, flexible eyeglass frames, and aerospace actuators.

Which of the following is the most suitable title for this passage?

  1. A
    A History of Modern Naval Metallurgy and Inventions
  2. The Unique Properties and Applications of NitinolAnswer
  3. C
    Breaking Chemical Bonds in Deformed Metals
  4. D
    Manufacturing Medical Stents and Eyeglass Frames

Answer

The Unique Properties and Applications of Nitinol
The title 'The Unique Properties and Applications of Nitinol' correctly captures the complete scope of the passage, summarizing both the explanation of how Nitinol's shape-memory mechanism works and the real-world products made from it.

Step-by-Step Solution

1
Identify the central subject and scope of the paragraph
The text introduces Nitinol, explains how its thermal shape-memory transformation works, and highlights its diverse modern applications.
An effective title must reflect the main theme of the entire paragraph rather than a single detail or an overgeneralized topic.
2
Evaluate the title options against the central theme
The title covering both the unique properties and applications of Nitinol accurately reflects the full scope of the text.
Distractors either broaden the subject to naval metallurgy, narrow it to specific product examples, or misstate factual details.

Key Concept

Selecting the Best Title
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Topics

Selecting the Best Title

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