| 1 |
Insulators have: |
- A. An empty conduction band
- B. Al full valence band
- C. A large energy gap
- D. All of above
|
| 2 |
Which one of the following is polymeric solids |
- A. Glass
- B. Nylon
- C. Copper
- D. Zinc
|
| 3 |
substance which undergo plastic deformation until they break are known as. |
- A. Brittle substances
- B. Ductile substance
- C. Non magnetic substance
- D. Magnetic substance
|
| 4 |
Domains are existed in |
- A. Ferromagnetic materials
- B. Paramagnetic materials
- C. Semi conductors
- D. Diamagnetic materials
|
| 5 |
The critical temperature of Aluminum is. |
- A. 3.72 K
- B. 1.18 K
- C. 7.2 K
- D. 8.2 K
|
| 6 |
A solid having regular arrangement of molecules throughout its structure is called. |
- A. Amorphous solid
- B. Polymeric solid
- C. Crystalline solid
- D. Glassy solid
|
| 7 |
The temperature at which, semiconductor behaves as insulators: |
- A. 10k
- B. 0k
- C. 237k
- D. None of above
|
| 8 |
Donor impurities are |
- A. Germanium, silicon
- B. Indium, galium
- C. Antimony, arsenic
- D. Diamond, carbon
|
| 9 |
The curie temp for iron is about |
- A. 800<sup>o</sup>C
- B. 740<sup>o</sup>C
- C. 750<sup>o</sup>C
- D. 650<sup>o</sup>C
|
| 10 |
Recentaly a complex crystalline structure known as yttrium barium copper oxide (Yba<sub>2 </sub>Cu<sub>3 </sub>O<sub>3</sub>) have reported to become super conductor at |
- A. 163 K
- B. 169 K
- C. 200 K
- D. 100 K
|