| 1 |
The number of crystal system are |
- A. Three
- B. Five
- C. Seven
- D. Fifteen
|
| 2 |
Which one of the following is crystalline solid. |
- A. Zirconia
- B. Glassy solid
- C. Natural rubber
- D. Poly strene
|
| 3 |
Donor impurities are |
- A. Germanium, silicon
- B. Indium, galium
- C. Antimony, arsenic
- D. Diamond, carbon
|
| 4 |
Minority carriers in P-Types , substances are. |
- A. Electrons
- B. Protons
- C. Holes
- D. Neutrons
|
| 5 |
The domain theory of magnet is important to explain the behaviour of |
- A. Diamagnets
- B. Paramagnets
- C. Ferromagnets
- D. All of these
|
| 6 |
Shear modulus is expressed as: |
- A. G = tanθ/F/A
- B. F/A/tanθ
- C. F/tanθ
- D. tanθ/A
|
| 7 |
A material which is insulator at 0 K and conduct at room temperature is. |
- A. Silver
- B. Lead
- C. Germanium
- D. Polythene
|
| 8 |
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
|
| 9 |
Example of ductile substance is. |
- A. Glass
- B. Wood
- C. Lead
- D. Oxygen
|
| 10 |
The temperature at which, semiconductor behaves as insulators: |
- A. 10k
- B. 0k
- C. 237k
- D. None of above
|