MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate the drift velocity of free electrons if a current of 200 A is maintained in a conductor of cross-section 10-3m2. The number density of free electrons is 96 1020 m-3. |
| A. | 130.20 ms<sup>-1</sup> |
| B. | 13.020 ms<sup>-1</sup> |
| C. | 1.3020 ms<sup>-1</sup> |
| D. | 0.1302 ms<sup>-1</sup> |
| Answer» B. 13.020 ms<sup>-1</sup> | |
| 2. |
Predict the effect of length of conductor on drift velocity of electrons. |
| A. | Drift velocity varies linearly with the length of conductor |
| B. | Drift velocity does not depend on the length of conductor |
| C. | Drift velocity increases with the increasing length of conductor |
| D. | Drift velocity decreases with the increasing length of conductor |
| Answer» E. | |
| 3. |
The mobility of a charge carrier is the drift velocity acquired by it in a unit cross-sectional area. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
A potential difference of 100 V is applied across a conductor of length 50cm. Calculate the drift velocity of electrons if the electron mobility is 9 10-5 m2V-1s-1. |
| A. | 0.001 ms<sup>-1</sup> |
| B. | 1.800 ms<sup>-1</sup> |
| C. | 0.018 ms<sup>-1</sup> |
| D. | 0.180 ms<sup>-1</sup> |
| Answer» D. 0.180 ms<sup>-1</sup> | |
| 5. |
Predict the effect of temperature of the conductor on the drift velocity of electrons. |
| A. | Drift velocity varies linearly with temperature |
| B. | Drift velocity does not depend on the temperature |
| C. | Drift velocity increases with increasing temperature |
| D. | Drift velocity decreases with increasing temperature |
| Answer» E. | |
| 6. |
Calculate the drift velocity of free electrons if a current of 5 A is maintained in a conductor of cross-section 10-2m2. The number density of free electrons is 5 1020m-3. |
| A. | 6.25 ms<sup>-1</sup> |
| B. | 5.25 ms<sup>-1</sup> |
| C. | 2.25 ms<sup>-1</sup> |
| D. | 12.25 ms<sup>-1</sup> |
| Answer» B. 5.25 ms<sup>-1</sup> | |
| 7. |
Consider a conductor of length 0.5 m. A potential difference of 20V is applied across this conductor. If the drift velocity of electrons is given as 5.0 10-4ms-1, then determine the mobility of the electrons. |
| A. | 5.25 10<sup>18</sup>m<sup>2</sup>V<sup>-1</sup>s<sup>-1</sup> |
| B. | 5.25 10<sup>-18</sup>m<sup>2</sup>V<sup>-1</sup>s<sup>-1</sup> |
| C. | 1.25 10<sup>-5</sup> m<sup>2</sup>V<sup>-1</sup>s<sup>-1</sup> |
| D. | 1.25 10<sup>6</sup>m<sup>2</sup>V<sup>-1</sup>s<sup>-1</sup> |
| Answer» D. 1.25 10<sup>6</sup>m<sup>2</sup>V<sup>-1</sup>s<sup>-1</sup> | |
| 8. |
What is the SI unit of mobility? |
| A. | Vm<sup>-1</sup> |
| B. | m<sup>2</sup>V<sup>-1</sup>s<sup>-1</sup> |
| C. | mV<sup>-2</sup> |
| D. | m<sup>2</sup>V<sup>-2</sup>s<sup>-1</sup> |
| Answer» C. mV<sup>-2</sup> | |