MCQ practice · SSC Physics Board questions · Chapter 11: Current Electricity
When the temperature rises, in a conductor-
Think it through first, then pick an option.
- a the electric current increases
- b the resistance increases
- c the electric current remains unchanged
- d the resistance decreases
Answer and explanation
Correct answer: b the resistance increases
Raising the temperature increases the specific resistance and the resistance of a conductor.
Why the other options are wrong
- a the electric current increases: A rise in temperature increases the resistance, so the current does not increase; it falls.
- c the electric current remains unchanged: The resistance changes with temperature, so the current does not stay unchanged either.
- d the resistance decreases: The resistance falls in a semiconductor; in a conductor it rises with temperature.
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