In the circuit if current flowing through $R_2$ is $0.5\mathrm{A}$ and through $20\mathrm{\Omega }$ is $1\mathrm{A}$ ,then resistance ${\mathrm{R}}_1$ and ${\mathrm{R}}_2$ are respectively​​​​​​​

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The potential difference $\left(V_{\mathrm{A}}-V_{\mathrm{B}}\right)$ between the points $A$ and $B$ in the given figure is

A current of $0.1 \mathrm{A}$ flows through a $25 \mathrm{\Omega }$ resistor represented by the circuit diagram. The current in the $80 \mathrm{\Omega }$ resistor is:

Two batteries with e.m.f. $12 \mathrm{V}$ and $13 \mathrm{V}$ are connected in parallel across a load resistor of $10 \mathrm{\Omega }$. The internal resistance of the two batteries are $1 \mathrm{\Omega }$ and $2 \mathrm{\Omega }$ respectively. The voltage across the load lies between, 

The figure below shows a circuit and its input voltage $V_i$ as a function of time $t$.

Assuming the diodes to be ideal, which of the following graphs depicts the output voltage $V_o$ as function of time $t ?$

For a diode connected in parallel with a resistor, which is the most likely current $\left(I\right)$-voltage $\left(V\right)$ characteristic graph?

Two batteries of emfs $\mathrm{4\; V}$ and $\mathrm{8\; V}$ with internal resistances $\mathrm{1 }\mathrm{\Omega }$ and $\mathrm{2 }\mathrm{\Omega }$ are connected in a circuit with a resistance of $\mathrm{9 }\mathrm{\Omega }$ as shown in figure. The current and potential difference between the points $\mathit{P}$ and $\mathit{Q}$ are,