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Nilima Nilima
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Asked: 2022-03-29T08:35:02+00:00 In:

Question 19: NCERT Solutions for 12th Class Physics: Chapter 3-Current Electricity

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Question 19: NCERT Solutions for 12th Class Physics: Chapter 3-Current Electricity

Choose the correct alternative:

  1. Alloys of metals usually have (greater/less) resistivity than that of their constituent metals.
  2. Alloys usually have much (lower/higher) temperature coefficients of resistance than pure metals.
  3. The resistivity of the alloy manganin is nearly independent of/increases rapidly with increase of temperature.
  4. 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).
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1 Answer

  1. Enlightened

    Solution:

    1. Alloys of metals usually have greater resistivity than that of their constituent metals.
    2. Alloys usually have much lower temperature coefficients of resistance than pure metals.
    3. The resistivity of the alloy manganin is nearly independent of increasing temperature.
    4. The resistivity of a typical insulator (e.g. amber) is greater than that of a metal by factor of the order of 1022.

    Check the complete chapter with solutions.

    NCERT Solutions for 12th Class Physics: Chapter 3-Current Electricity

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