31. The Fe. Al intermetallic phase has a disordered bcc structure at high temperatures. This first four Bragg reflections will be
32. An elliptical dislocation loop is gliding on plane ABCD of a single crystal of BCC material as shown in the following figure. It is gliding along the burger vector 'b'. Identify the correct statement.
P. Plane ABCD belongs to the family of (110).
Q. Burger vector 'b' belong to <110> direction.
R. Dislocation has the edge character at point x and the screw character at point z.
S. Dislocation has the screw character at point x
P. Plane ABCD belongs to the family of (110).
Q. Burger vector 'b' belong to <110> direction.
R. Dislocation has the edge character at point x and the screw character at point z.
S. Dislocation has the screw character at point x
33. Match the planes in Group 1 with the interplaner spacings in Group 2 for a cubic crystal having a lattice parameter of 'α'.
Group 1
Group 2
P. (100)
1. $$\frac{\alpha }{{\surd 5}}$$
Q. (110)
2. $$\frac{\alpha }{{\surd 3}}$$
R. (111)
3. $$\frac{\alpha }{{\surd 2}}$$
S. (210)
4. α
5. $$\frac{\alpha }{2}$$
6. $$\frac{\alpha }{3}$$
| Group 1 | Group 2 |
| P. (100) | 1. $$\frac{\alpha }{{\surd 5}}$$ |
| Q. (110) | 2. $$\frac{\alpha }{{\surd 3}}$$ |
| R. (111) | 3. $$\frac{\alpha }{{\surd 2}}$$ |
| S. (210) | 4. α |
| 5. $$\frac{\alpha }{2}$$ | |
| 6. $$\frac{\alpha }{3}$$ |
34. Match the energy gaps in Group II with the materials in Group I.
Group I
Group II
P. Diamond
1. 0.1 eV
Q. Silicon
2. 0.7 eV
R. Grey tin
3. 1.1 eV
4. 6.0 eV
| Group I | Group II |
| P. Diamond | 1. 0.1 eV |
| Q. Silicon | 2. 0.7 eV |
| R. Grey tin | 3. 1.1 eV |
| 4. 6.0 eV |