| 1 |
To get N-Type the Ge is doped with |
- A. Aluminium
- B. Arsenic
- C. Boron
- D. Indium
|
| 2 |
Out of the following which material is brittle. |
- A. Wrought iron
- B. Copper
- C. Tungsten
- D. High steel carbon
|
| 3 |
Natural rubber is an example of: |
- A. Crystalline solids
- B. Amorphous solids
- C. Polymeric solids
- D. None of above
|
| 4 |
The solid with definite M.L are called: |
- A. Crystalline
- B. Amorphous
- C. Polymeric
- D. None of above
|
| 5 |
An ordinary glass gradually softness into a paste like state before it becomes a very viscous liquid which is possible at |
- A. 900<sup>o</sup>C
- B. 600<sup>o</sup>C
- C. 800<sup>o</sup>C
- D. 100<sup>o</sup>C
|
| 6 |
Semiconductors have conductivity of order: |
- A. 10<sup>-8</sup> to 10<sup>-6</sup> (Ωm)<sup>-1</sup>
- B. 10<sup>-6</sup> to 10<sup>-4</sup> (Ωm)<sup>-1</sup>
- C. 10<sup>2</sup> to 10<sup>5</sup> (Ωm)<sup>-1</sup>
- D. 10<sup>-5</sup> to 10<sup>-7</sup> (Ωm)<sup>-1</sup>
|
| 7 |
A material which is insulator at 0 K and conduct at room temperature is. |
- A. Silver
- B. Lead
- C. Germanium
- D. Polythene
|
| 8 |
The temperature at which, semiconductor behaves as insulators: |
- A. 10k
- B. 0k
- C. 237k
- D. None of above
|
| 9 |
Donor impurities are |
- A. Germanium, silicon
- B. Indium, galium
- C. Antimony, arsenic
- D. Diamond, carbon
|
| 10 |
The unit of strain is: |
- A. Nm
- B. Nm<sup>-2</sup>
- C. no unit
- D. Nm<sup>2</sup>
|