| 1 |
Energy band theory is based upon |
- A. Hund's Rule
- B. Heisenberg uncertainty principle
- C. Bohr's atomic Model
- D. Wave mechanical model
|
| 2 |
Which type of impurity is to be added to a pure semi conductor crystal to provide holes. |
- A. Monovalent
- B. Trivalent
- C. Tetravalent
- D. Pentavalent
|
| 3 |
Young's modulus for water's is |
|
| 4 |
The material whose resistivity becomes zero below a certain temperature |
- A. Conductors
- B. Semi conductors
- C. Super conductors
- D. Insulators
|
| 5 |
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
|
| 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 wire stretched to double of its length, its strain is: |
|
| 8 |
Which of the modulus of elasticity is involved in compressing a rod to decrease its length ? |
- A. Young's modulus
- B. Bulk modulus
- C. Modulus of elasticity
- D. None of these
|
| 9 |
Insulators have: |
- A. An empty conduction band
- B. Al full valence band
- C. A large energy gap
- D. All of above
|
| 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
|