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CBSE Class 10 Sample Paper Science Solution - For 2023 Boards

Class 10
Solutions to CBSE Sample Paper - Science Class 10

A complete circuit is left on for several minutes, causing the connecting copper wire to

become hot. As the temperature of the wire increases, the electrical resistance of the wire


  1. decreases.
  2. remains the same.
  3. increases.
  4. increases for some time and then decreases .



  • The electrical resistance of a wire is dependent on the temperature of the conductor. 
  • In metals , the higher the temperature , the more the resistance increases. 
  • This happens because electrons in the wire start moving more erratically and hence face more resistance
  • In semi-conductors , the resistance of the wire decreases with temperature. 

As copper is a metal, its resistance increases with increase in temperature.

Therefore, the correct answer is (c) increases

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo