The given circuit diagram shows the experimental arrangement of different circuit components for determination of equivalent resistance of two resistors connected in series. The components X, Y and Z are shown in the circuit, respectively represent:

 

For the experiment “to find the equivalent resistance of the two given resistors connected in parallel” the following circuit was drawn by a student:

The teacher pointed out the possibility of the following faults:

$A.$The ammeter was not correctly connected in the circuit

$B.$The voltmeter was not correctly connected in the circuit

$C.$The resistors $R_1$ and $R_2$ were not correctly connected in parallel

$D.$The rheostat and the key were not correctly connected in the circuit.

The two faults pointed out correctly by the teacher, are

The current flowing through a resistor connected in an electric circuit and the potential difference developed across the ends of it are as shown in the diagrams.

The value of the resistance of the resistor used in ohm is:

In an experiment to study the dependence of current on potential difference across a resistor, a student obtained the graph as shown in the diagram.

The value of resistance of the resistor is:

In the circuit given below, on plugging the key the voltmeter reads $2.0V$ but ammeter reads $0.6A$. The resistance of the combination is:

In the experiment studying the dependence of current $I$ on the potential difference $V$, three students plotted the following graphs between $V$ and $I$. The graph that is likely to be correct is/are: