Question

Which of the following shows correct range of conductivity?
(i) Conductors: ${10}^4$ to ${10}^7$ $oh{m}^{-1}$ $m^{-1}$ (ii) Insulators: ${10}^{-6}$ to ${10}^4$ $oh{m}^{-1}$ $m^{-1}$
(iii) Semiconductors: : ${10}^{-10}$ to ${10}^{-6}$ $oh{m}^{-1}$ $m^{-1}$

• A. (i) and (ii)
• B. (i) only
• C. (ii) and (iii)
• D. (i), (ii) and (iii)

Answer 1

The correct option is B (i) only

Range of conductivity of different materials is given by:

i) Conductors: ${10}^4$ to ${10}^{7}oh{m}^{-1}{m}^{-1}$

ii) Semiconductors: ${10}^{-6}$ to ${10}^{4}oh{m}^{-1}{m}^{-1}$

iii) Insulators: ${10}^{-20}$ to ${10}^{-10}oh{m}^{-1}{m}^{-1}$

Hence, Option "B" is the correct answer.