MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Manufacturing Engineering Questions & Answers Electrical Properties of Materials knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
With an increase in temperature, the resistance of a semiconductor ____________ |
| A. | increases |
| B. | decreases |
| C. | remains Constant |
| D. | first increases and then decreases |
| Answer» C. remains Constant | |
| 2. |
If a copper wire of 10 m length having 0.44mm diameter has resistance of 2 Ohm, then what will be the specific resistance (in Ohm-m)? |
| A. | 1.520 10<sup>-8</sup> |
| B. | 3.041 10<sup>-8</sup> |
| C. | 1.520 10<sup>-6</sup> |
| D. | 1.520 10<sup>-5</sup> |
| Answer» C. 1.520 10<sup>-6</sup> | |
| 3. |
If a copper wire of 200 m length having 0.44mm diameter has resistance of 20 Ohm, then find its specific resistance (in Ohm-m). |
| A. | 1.520 10<sup>-8</sup> |
| B. | 1.520 10<sup>-7</sup> |
| C. | 1.520 10<sup>-6</sup> |
| D. | 1.520 10<sup>-5</sup> |
| Answer» B. 1.520 10<sup>-7</sup> | |
| 4. |
What is the energy gap (Eg) of a metal? |
| A. | E<sub>g</sub> < 3 ev |
| B. | E<sub>g</sub> < 1 ev |
| C. | E<sub>g</sub> > 1 ev |
| D. | E<sub>g</sub> > 3 ev |
| Answer» C. E<sub>g</sub> > 1 ev | |
| 5. |
What is the energy gap (Eg) of an insulator? |
| A. | E<sub>g</sub> < 3 ev |
| B. | E<sub>g</sub> < 1 ev |
| C. | E<sub>g</sub> < 0 ev |
| D. | E<sub>g</sub> > 3 ev |
| Answer» E. | |
| 6. |
What is the resistivity of bismuth (in Ohm-m) at room temperature? |
| A. | 1.29 10<sup>-6</sup> |
| B. | 1.29 10<sup>-3</sup> |
| C. | 1.29 10<sup>-5</sup> |
| D. | 1.29 10<sup>-9</sup> |
| Answer» B. 1.29 10<sup>-3</sup> | |
| 7. |
What is the resistivity of iron (in Ohm-m) at room temperature? |
| A. | 9.71 10<sup>-2</sup> |
| B. | 9.71 10<sup>-8</sup> |
| C. | 9.71 10<sup>-5</sup> |
| D. | 9.71 10<sup>-9</sup> |
| Answer» C. 9.71 10<sup>-5</sup> | |
| 8. |
What is the resistivity of silver (in Ohm-m) at room temperature? |
| A. | 1.59 10<sup>-2</sup> |
| B. | 1.59 10<sup>-3</sup> |
| C. | 1.59 10<sup>-5</sup> |
| D. | 1.59 10<sup>-9</sup> |
| Answer» E. | |
| 9. |
With an increase in the mean free path of electrons, materials conductivity ____________ |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | first increases and then decreases |
| Answer» B. decreases | |
| 10. |
Which of the following is the de Broglie s equation ( = wavelength, v = velocity, m = mass, h = Planck s constant)? |
| A. | = h/mv |
| B. | = h/m |
| C. | = h/v |
| D. | = mv/h |
| Answer» B. = h/m | |