Lakhmir Singh and Manjit Kaur Solutions for Chapter: Electricity, Exercise 19: Multiple Choice Questions (MCQs)

The resistance of a wire of length $300 \mathrm{m}$ and cross-section area $1.0 {\mathrm{mm}}^2$ made of material of resistivity $1.0\times {10}^{-7} \mathrm{\Omega } \mathrm{m}$ is:

When the diameter of a wire is doubled, its resistance becomes:

If the resistance of a certain copper wire is $1 \mathrm{\Omega }$, then the resistance of a similar nichrome wire will be about:

If the diameter of a resistance wire is halved, then its resistance becomes:

The resistivity of a certain material is $0.6 \mathrm{\Omega } \mathrm{m}$. The material is most likely to be:

When the area of cross-section of a conductor is doubled, its resistance becomes:

The resistivity of copper metal depends on only one of the following factors. This factor is:

If the area of cross-section of a resistance wire is halved, then its resistance becomes: