Question 19: NCERT Solutions for 12th Class Physics: Chapter 3-Current Electricity
Choose the correct alternative:
- Alloys of metals usually have (greater/less) resistivity than that of their constituent metals.
- Alloys usually have much (lower/higher) temperature coefficients of resistance than pure metals.
- The resistivity of the alloy manganin is nearly independent of/increases rapidly with increase of temperature.
- The resistivity of a typical insulator (e.g., amber) is greater than that of a metal by a factor of the order of (1022 or 103).
Check the complete chapter with solutions.
NCERT Solutions for 12th Class Physics: Chapter 3-Current Electricity