| 1 |
Which of the following has least hysteresis loop area. |
- A. Steel
- B. Wrought Iron
- C. Soft Iron
- D. Cobalt
|
| 2 |
The most suitable metal for making permanent magnet is. |
- A. Iron
- B. Aluminium
- C. Steel
- D. Copper
|
| 3 |
In extrinsic semiconductors doping is of the order of. |
- A. 1 atom to 10<sup>4</sup>
- B. 1 atom to 10<sup>6</sup>
- C. 1 atom to 10<sup>8</sup>
- D. 1 atom to 10<sup>3</sup>
|
| 4 |
Which of the following has bulk modulus? |
- A. Water
- B. Gas
- C. Honey
- D. All
|
| 5 |
The temperature at which, semiconductor behaves as insulators: |
- A. 10k
- B. 0k
- C. 237k
- D. None of above
|
| 6 |
The conductors having the conductivity of the order of |
|
| 7 |
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
|
| 8 |
The first superconductor was discovered in: |
- A. 1831
- B. 1911
- C. 1921
- D. 1876
|
| 9 |
Which one is pentavalent impurity |
- A. Boron
- B. Gallium
- C. Antimony
- D. Indium
|
| 10 |
The material whose resistivity becomes zero below a certain temperature |
- A. Conductors
- B. Semi conductors
- C. Super conductors
- D. Insulators
|
