Match the LIST-I with LIST-II
| LIST-I (Material) | LIST-II (Resistivity range (in Ω m)) |
| A. Insulator | I. 1011 – 1019 |
| B. Metals | II. 10–2 – 10–8 |
| C. Semiconductor | III. 10–5 – 106 |
| D. Superconductor | IV. 0 |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → A - I, B - II, C - III, D - IV
Solids are classed by their resistivity, which depends on how many free charge carriers they have.
(A) Insulator — this matches (I) 1011 – 1019. An insulator has a very large band gap and almost no free electrons, so its resistivity is extremely high.
(B) Metals — this matches (II) 10–2 – 10–8. Metals have a large number of free electrons, so their resistivity is very low.
(C) Semiconductor — this matches (III) 10–5 – 106. A semiconductor has a small band gap, so its resistivity lies between those of metals and insulators.
(D) Superconductor — this matches (IV) 0. Below its critical temperature a superconductor has zero resistivity.
NCERT (2026-27):
On the Basis of Conductivity – “On the basis of the relative values of electrical conductivity (σ) or resistivity (ρ = 1/σ), the solids are broadly classified as:
(i) Metals: They possess very low resistivity (or high conductivity).
ρ ~ 10–2 – 10–8 Ω m …
(ii) Semiconductors: They have resistivity or conductivity intermediate to metals and insulators.
ρ ~ 10–5 – 106 Ω m …
(iii) Insulators: They have high resistivity (or low conductivity).
ρ ~ 1011 – 1019 Ω m …”
Diamagnetism – “… The most exotic diamagnetic materials are superconductors. These are metals, cooled to very low temperatures which exhibits both perfect conductivity and perfect diamagnetism.”