| 1 |
At 0 K a piece of silicon is a |
- A. Conductor
- B. Semi-conductor
- C. Insulator
- D. All
|
| 2 |
Curie temperature is |
- A. Differen for chromium oxide and cobalt
- B. Same for chromium oxide and cobalt
- C. Same for iron and cobalt
- D. None of these
|
| 3 |
Those materials whose resistivity becomes zero at certain temperature is called: |
- A. Semiconductor
- B. Super conductor
- C. Conductor
- D. Insulator
|
| 4 |
The critical temperature of mercury is. |
- A. 1.18 K
- B. 4.2 K
- C. 3.72 K
- D. 7.2 K
|
| 5 |
A pentaralent impurity in Si |
- A. a free electron and a free hole
- B. a free hole
- C. a free electron
- D. No free particle
|
| 6 |
Domains are existed in |
- A. Ferromagnetic materials
- B. Paramagnetic materials
- C. Semi conductors
- D. Diamagnetic materials
|
| 7 |
Recently superconductor discovered is at temperature. |
- A. 110K
- B. 143K
- C. 16.3K
- D. 119K
|
| 8 |
The crystalline structure of NaCl is. |
- A. Cubical
- B. Hexagonal
- C. Tri gonal
- D. Tetragonal
|
| 9 |
The temperature at which, semiconductor behaves as insulators: |
- A. 10k
- B. 0k
- C. 237k
- D. None of above
|
| 10 |
After curie temperature. |
- A. Ferromagnetic
- B. Paramagnetic
- C. Magnetic
- D. Diamagnetic
|