JEE Previous Year Question

The values of conductivity of some materials at $298.15K\text{in}{\text{Sm}}^{-1}$ are $2.1\times {10}^3$,$1.0\times {10}^{-16}\text{,}1.2\times 10\text{,}3.91\text{,}1.5\times {10}^{-2}\text{,}1\times {10}^{-7}\text{,}1.0\times {10}^3$. The number of conductors among the materials is_______

Topic: JEE PYQ

Answer: 4. Full step-by-step solution below.