What is the direction of conventional current?

The current flowing through a wire depends on time as $I = 3t^2 + 2t + 5$. The charge flowing through the cross-section of the wire in the time interval from $t = 0$ to $t = 2 \ s$ is: (in $C$)

In a neon discharge tube,$2.9 \times 10^{18}$ $Ne^+$ ions move to the right each second,while $1.2 \times 10^{18}$ electrons move to the left per second. The electron charge is $1.6 \times 10^{-19} \, C$. The current in the discharge tube is:

$A$ steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor is/are:

Due to what is current formed in an electrolyte?

Identify the set in which all the three materials are good conductors of electricity.