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MCQ practice · SSC Physics Board questions · Chapter 11: Current Electricity

Jashore Board 2021

What is the specific resistance of gold?

Think it through first, then pick an option.

  1. a 2.5 × 10⁻⁶ Ω m
  2. b 2.44 × 10⁻⁸ Ω m
  3. c 1.68 × 10⁻⁸ Ω m
  4. d 1.59 × 10⁻⁸ Ω m
Answer and explanation

Correct answer: b 2.44 × 10⁻⁸ Ω m

By Table 11.01 the specific resistance of gold is 2.44×10⁻⁸ Ω m.

Why the other options are wrong

  • a 2.5 × 10⁻⁶ Ω m: 2.5×10⁻⁶ Ω m is the value for graphite; gold is 2.44×10⁻⁸ Ω m.
  • c 1.68 × 10⁻⁸ Ω m: 1.68×10⁻⁸ Ω m is the value for copper; gold is 2.44×10⁻⁸ Ω m.
  • d 1.59 × 10⁻⁸ Ω m: 1.59×10⁻⁸ Ω m is the value for silver; gold is 2.44×10⁻⁸ Ω m.