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  • Question

  • Assertion (A): The resistance of a copper specimen changes by about 22% when temperature is increased from room temperature to 700°C.

    Reason (R): The physical properties of a material are determined mostly by the extent of impurities.


  • Options
  • A. Both A and R are true and R is correct explanation of A
  • B. Both A and R are true but R is not correct explanation of A
  • C. A is true but R is false
  • D. A is false but R is true

  • Correct Answer
  • Both A and R are true but R is not correct explanation of A 

    Explanation
    The increase of resistance with temperature is governed by temperature coefficient of resistance.

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    • A. True
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    • C. need 5 V supply
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