If the diodes are ideal in the circuit given below,then the current through the cell is (in $A$)

In the following circuits,which one of the diodes is reverse biased?

For the circuit shown in the figure,the equivalent resistance between points $A$ and $B$ for two cases $(i)$ $V_A > V_B$ and (ii) $V_B > V_A$ is $\qquad \Omega$ and $\qquad \Omega$ respectively. ($D_1$ and $D_2$ are ideal diodes)

Which is the wrong statement in the following sentences? $A$ device in which $P$ and $N$-type semiconductors are used is more useful than a vacuum tube because:

In the following circuit,the reading in the ammeter is (in $mA$)

The current-voltage relation of a diode is given by $I = (e^{1000V/T} - 1) \; mA$,where the applied voltage $V$ is in volts and the temperature $T$ is in Kelvin. If a student makes an error of $\pm 0.01 \; V$ while measuring the voltage to obtain a current of $5 \; mA$ at $300 \; K$,what will be the error in the value of the current in $mA$?