MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Identify the temperature at which the resistance of copper would be double of its resistance at oC. Given α (temperature coefficient of resistivity) for copper=3.9 x 10-3 oC-1. |
| A. | 125oC |
| B. | 256oC |
| C. | 1080oC |
| D. | 273oC |
| Answer» C. 1080oC | |
| 2. |
Which of the following is not a valid reason for using alloys to make standard resistors? |
| A. | Alloys have a high value of resistivity |
| B. | They are least affected by air and moisture |
| C. | Alloys have a large temperature coefficient |
| D. | Their contact potential with copper is small |
| Answer» D. Their contact potential with copper is small | |
| 3. |
A wire has a resistance of 5.5 Ω at 19oC and 21.5 Ω at 200oC. Find the temperature coefficient of resistivity(α) of the material. |
| A. | 0.016 oC-1 |
| B. | 0.160 oC-1 |
| C. | 1.600 oC-1 |
| D. | 16.00 oC-1 |
| Answer» B. 0.160 oC-1 | |
| 4. |
The resistivity of ‘X’ decreases with temperature and its coefficient of resistivity is negative. Identify X. |
| A. | Silver |
| B. | Silicon |
| C. | Copper |
| D. | Nichrome |
| Answer» C. Copper | |
| 5. |
The resistivity of semiconductors and insulators decreases linearly with the increase of temperature. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Which among the following has weak temperature dependence values with resistivity? |
| A. | Silver |
| B. | Copper |
| C. | Nichrome |
| D. | Germanium |
| Answer» D. Germanium | |
| 7. |
Identify the type of material based on the T-ρ graph given below. |
| A. | Silicon |
| B. | Polymer |
| C. | Nichrome |
| D. | Copper |
| Answer» E. | |
| 8. |
Which of the following relation is significant for metals when the temperature increases? |
| A. | Resistivity increases and conductivity decreases |
| B. | Resistivity decreases and conductivity decreases |
| C. | Resistivity and conductivity do not change with temperature |
| D. | Temperature dependence is non-linear |
| Answer» B. Resistivity decreases and conductivity decreases | |
| 9. |
What is the unit of the temperature coefficient of resistance (α)? |
| A. | oC |
| B. | oC-1 |
| C. | \(\frac {\Omega}{ ^{\circ} C}\) |
| D. | \(\frac { ^{\circ} C}{\Omega}\) |
| Answer» C. \(\frac {\Omega}{ ^{\circ} C}\) | |
| 10. |
Identify the material which is suitable for making standard resistors. |
| A. | Silver |
| B. | Copper |
| C. | Constantan |
| D. | Germanium |
| Answer» D. Germanium | |