Do diodes have resistance?

Identify the semiconductor devices whose characteristics are given below, in the order $\left(\mathrm{a}\right),\mathrm{ }\left(\mathrm{b}\right),\mathrm{ }\left(\mathrm{c}\right),\mathrm{ }\left(\mathrm{d}\right)$:

The non-zero potential difference across diode $D_1$ and that across diode $D_2$ are equal in the circuit shown in the figure (both the diodes are identical in characteristics)

The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance $R_1$ will be

The $V-I$ characteristic of a diode is shown in the figure. The ratio of forward to reverse bias resistance is:

In the following circuit diagram, the current through the battery is

$Ge$ and $Si$ diodes start conducting at $0.3 V$ and $0.7 V$ respectively. In the following figure if $Ge$ diode connection are reversed, the value of $V_0$ changes by: (assume that the Ge diode has large breakdown voltage)

In the following circuit, the equivalent resistance between $A$ and $B$ is

Determine the current passing through the diode $D_2$ in the circuit given. Assume these are Silicon diodes.

A $5 \mathrm{V}$ battery is connected across the points $X$ and $Y$. Assume $D_1$ and $D_2$ to be normal silicon diodes. Find the current supplied by the battery if the $+ve$ terminal of the battery is connected to point $X$.