| 1 |
Curie temperature is a point where : |
- A. Diamagnetism changes to paramagnetism
- B. Paramagnetism changes to Diamagnetism
- C. Ferromagnetism changes to paramagnetism
- D. Paramagnetism changes to Ferromagnetism
|
| 2 |
Donor impurities are |
- A. Germanium, silicon
- B. Indium, galium
- C. Antimony, arsenic
- D. Diamond, carbon
|
| 3 |
A semiconductor in its extremely pure form is known as: |
- A. Intrinsic
- B. Extrinsic
- C. Both a and b
- D. None of above
|
| 4 |
Young's modulus for water's is |
|
| 5 |
A material which is insulator at 0 K and conduct at room temperature is. |
- A. Silver
- B. Lead
- C. Germanium
- D. Polythene
|
| 6 |
Insulators have: |
- A. An empty conduction band
- B. Al full valence band
- C. A large energy gap
- D. All of above
|
| 7 |
Coercive force is used to |
- A. Demagnetize the material
- B. Magnetize the material
- C. Extend it
- D. None of these
|
| 8 |
The ability of a body to return to its original shape is called. |
- A. Strain
- B. Stress
- C. Elasticity
- D. Plasticity
|
| 9 |
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
|
| 10 |
The temperature at which, semiconductor behaves as insulators: |
- A. 10k
- B. 0k
- C. 237k
- D. None of above
|