Discuss two methods of testing a conductor or an insulator

In the circuit given in the figure, Boojho observed that copper is deposited on the electrode connected to the negative terminal of the battery. Paheli tried to repeat the same experiment. But she could find only one copper plate. Therefore, she took a carbon rod as negative electrode. Will copper be still deposited on the carbon rod? Explain your answer.

You are provided with a magnetic compass, an empty matchbox, a battery of two cells and connecting wires. Using these objects, how will you make a tester for testing an electric circuit? Draw the necessary circuit diagram and explain.

Prove that lemon juice and vinegar are good conductors of electricity.

Observe the circuit given in figure.

Boojho set up this circuit for purification of copper. What will be the nature of
(a) plate A
(b) plate B
(c) and the solution. Explain the process of purification

Observing that the bulb does not glow in the circuit shown in Fig. (a) Boojho changed the circuit as shown in Fig. (b). He observed deflection in the magnetic compass.

(a) What does the deflection in magnetic compass indicate?
(b) Why did the bulb not glow in Fig. (a)?
(c) What would be the effect of increase in the number of turns in the coil wound around the magnetic compass in Fig. (b)?

One day Ram was performing and experiment. He was trying to design an electric circuit in which he included tester, bulb and a battery. He had so much eagerness regarding this experiment that in so much hurry, he forgot to take the connecting wires of aluminium. He took the wires without any coating of PVC on them, so it could be dangerous for him. Any how, he managed to design an electric circuit but the moment, he switched ON the circuit, a spark produces and bulb get fused with a small sound. He was about to touch those wires and heated bulb with his bare hands, at the same time, his teacher suggested him to perform the experiment by taking precautions.
(a) Explain, what could be happened, if Ram would touch the electric bulb with his bare hands.
(b) Mention why should he use the aluminium wires in his experiment.
(c) State the values shown by Ram's teacher here.

What is electroplating? What are its advantages?