Question

Find the resistance value of the carbon resistor if the colors of bands are green, violet, and red respectively.

(a) 57 × 10^2Ω ± 5%

(b) 57 × 10^2Ω ± 10%

(c) 57 × 10^2Ω ± 20%

(d) 57 × 10^2Ω

I have been asked this question during an interview.

This key question is from Current Electricity topic in chapter Current Electricity of Physics – Class 12

Answer 1

The correct answer is (c) 57 × 10^2Ω ± 20%

For explanation I would say: A color code is used to indicate the resistance value of a carbon resistor and its percentage accuracy. The corresponding value of resistance for the given color code is 57 × 10^2Ω ± 20% (Green-5; Violet-7; Red-2; No fourth band-20%).