Crystal Defects

1. Which of the following is a point imperfection?

1. Vacancy

2. Interstitial

3. Frenkel imperfection

4. Schottky imperfection

(a) 1 and 2 only

(b) 2 and 3 only

(c) 2, 3 and 4 only

(d) 1, 2, 3 and 4

Answer

2. Which one of the following defects is ‘Schottky defect’?

(a) Vacancy defect

(b) Compositional defect

(c) Interstitial defect

(d) Surface defect

Answer

3. Which of the following properties of a solid are dependent on crystal imperfections?

1. Yield stress

2. Melting point

3. Semi conductivity

4. Ductility

Select the correct answer using the codes given below: 

(a) 1 and 3

(b) 1, 3 and 4

(c) 2, 3 and 4

(d) 2 and 4

Answer

4. Which of the following factors govern solubility of two non-ferrous metals both in liquid state, as well as in solid state?

1. Crystal structure

2. Relative size factor

3. Chemical-affinity factor

4. Relative valence factor

Select the correct answer using the codes given below: 

Codes:

(a) 1, 2 and 3

(b) 2, 3 and 4

(c) 1 and 4

(d) 1, 2, 3 and 4

Answer

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