For which of the following does the resistance decrease upon increasing the temperature?

The length of a hollow tube is $5\,m$,its outer diameter is $10\,cm$,and the thickness of its wall is $5\,mm$. If the resistivity of the material of the tube is $1.7 \times 10^{-8} \,\Omega m$,then the resistance of the tube will be:

Masses of three wires of copper are in the ratio of $1 : 3 : 5$ and their lengths are in the ratio of $5 : 3 : 1$. The ratio of their electrical resistance is . . . . . . .

If copper and silicon are cooled from $300 \, K$ to $60 \, K$,their resistivity will:

Resistivity of which of the following substances decreases on increasing the temperature?

When the temperature of a conductor increases, the ratio of conductivity and resistivity . . . . . . .