| 1 |
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
|
| 2 |
There are different crystal systems. The number of these crystal system is. |
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| 3 |
To get N-Type the Ge is doped with |
- A. Aluminium
- B. Arsenic
- C. Boron
- D. Indium
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| 4 |
Conductors have conductivities of order: |
- A. 10<sup>3</sup>(Ωm)-1
- B. 10<sup>7</sup>(Ωm)<sup>-1</sup>
- C. 10<sup>7</sup>Ωm<sup>-1</sup>
- D. 10<sup>-6</sup>Ω
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| 5 |
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
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| 6 |
There is regular arrangement of molecules in: |
- A. Amorphous solids
- B. Crystalline solids
- C. Both a and b
- D. None of above
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| 7 |
The temperature at which, semiconductor behaves as insulators: |
- A. 10k
- B. 0k
- C. 237k
- D. None of above
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| 8 |
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>
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| 9 |
The solids are classified as |
- A. Polymeric
- B. Amorphous
- C. Crystalline
- D. All of above
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| 10 |
A solid having regular arrangement of molecules throughout its structure is called. |
- A. Amorphous solid
- B. Polymeric solid
- C. Crystalline solid
- D. Glassy solid
|