Question

Match each crystal defect in Column I with the corresponding type in Column II. 

• A. P – 2, Q – 3, R – 1, S – 4
• B. P – 2, Q – 3, R – 4, S – 1
• C. P – 2, Q – 3, R – 1, S – 4
• D. P – 3, Q – 4, R – 1, S – 2

Hint:

When dealing with crystal defects, remember that the dimensionality refers to the number of dimensions over which the defect extends. One-dimensional defects involve dislocations, two-dimensional defects involve planes of atoms (e.g., stacking faults), and three-dimensional defects involve voids or pores in the structure.

Answer 1

The Correct Option is C

To match the crystal defects in Column I with their corresponding types in Column II, we need to understand the nature of each defect: 
Step 1: Understanding each defect
- Edge dislocation (P): A dislocation that moves along a line, causing a distortion in the crystal. This is a one-dimensional defect (Option 2).
- Stacking fault (Q): A planar defect in the crystal structure where the stacking order of atoms is disrupted. This is a two-dimensional defect (Option 3).
- Frenkel defect (R): A zero-dimensional defect where an atom or ion is displaced from its regular position, creating a vacancy and an interstitial defect (Option 1).
- Porosity (S): This refers to voids or empty spaces within the crystal structure, making it a three-dimensional defect (Option 4).

Step 2: Analyze the options
 

• Option (A): Incorrect — The matching for Frenkel defect and porosity is swapped.
• Option (B): Incorrect — The matching for Frenkel defect and porosity is swapped.
• Option (C): Correct — Edge dislocation matches with a one-dimensional defect, stacking fault with a two-dimensional defect, Frenkel defect with a zero-dimensional defect, and porosity with a three-dimensional defect.
• Option (D): Incorrect — The matching for edge dislocation and stacking fault is swapped.

Step 3: Conclusion
The correct matching is Option (C), where the defects are matched appropriately with their types.