CBSE Class 10 Sample Paper Science Solution - For 2023 Boards

Class 10
Solutions to CBSE Sample Paper - Science Class 10


Plastic insulation surrounds a wire having diameter d and length l as shown above. A decrease in the resistance of the wire would be produced by an increase in the


  1. length l of the wire
  2. diameter d of the wire
  3. temperature of the wire
  4. thickness of the plastic insulation



  • Resistance is directly proportional to the  resistivity of the material, and length of the wire.
  • It is inversely proportional on the Area of the wire. 
  • Therefore, the resistance of the material would only decrease with an increase in area .
  • This can be done by increasing the diameter .


The correct answer is (b) diameter d of the wire

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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