Current Electricity Questions

The solids which have the negative temperature coefficient of resistance are:

Which of the following graph represents the variation of resistivity ($\rho$) with temperature ($T$) for copper?

The color code of a resistance is given as: Yellow, Violet, Brown, Gold. The values of resistance and tolerance, respectively, are:

A charged particle having drift velocity of $7.5\times 10^{-4}{\text{m s}}^{-1}$ in an electric field of $3\times 10^{-10}{\text{V m}}^{-1}$, has a mobility in ${\text{m}}^2{\text{V}}^{-1}{\text{ s}}^{-1}$ of:

A resistance wire connected in the left gap of a metre bridge balances a $10\Omega$ resistance in the right gap at a point which divides the bridge wire in the ratio $3:2$. If the length of the resistance wire is $1.5\text{m}$, then the length of $1\Omega$ of the resistance wire is: