(i) If Suhail had switched on the electric iron rod barefooted, then he could have met with some accident, either in the form of electrical sparking or short circuit of switch board.
(ii) Suhail's room partner seems to be very intelligent and very much concerned for Suhail as well.

No, it is highly unacceptable. It is the wastage of national energy resources and these kinds of habits should be punished or fined. It can affect the economical condition of family and nation both, as they have to pay much more amount as bill and nation has to produce more electricity by using more resources or they have to decrease the amount of power supply

We should not experiment with electric supply from mains as supply is very strong and of a high voltage. It may be very dangerous. We should experiment with electric cells only.

The following methods are used to test the conduction:
(i)The conductivity of substance can be checked by using electric bulb. When the liquid between the two ends of the tester allows the electric current to pass, the circuit of the tester becomes complete. The current flows in the circuit and the bulb glows. If the circuit of tester is not complete the bulb does not glow. This method does not work when current is very small.

(ii) We can use another effect of electric current to test the conduction. A magnetic tester is also used to test conductivity. When current is allowed to pass through it, it creates a magnetic field and the compass shows that the current is passing through circuit

Chemical effects of electric current can be explained by following experiment:
(i) Take two carbon rods with metal caps. Clean their metal caps

(ii) Wrap copper wires around the metal caps of the carbon rods and join them to a battery.
(iii) Pour a full cup of water in a glass bowl and add a teaspoon of salt.
(iv) Immerse the electrodes in solution but metal caps should be out of the water.
(v) Wait for 5 min.
(vi) Observe the electrodes.
(vii) The passage of electric current through a conducting solution causes chemical reaction. As a result, bubbles of gas are formed near the electrodes. Deposits of metal may be seen on electrodes. Change of colour of solution may occur. These are some of the chemical effects of the electric current

The solutions of acids, bases and salts conduct electricity. This can be experimentally proved by following methods:
(i) Take three clean plastic or rubber caps of bottles.
(ii) Pour about two teaspoonfulls of distilled water in each of them.
(iii) Add few drops of lemon juice in one cap.
(iv) Add few drops of base as caustic soda in second cap.
(v) Add little salt to third cap to form salt solution.
(vi) Now conduct electricity through each. An electric current flows through all the conducting solutions thus indicating that acids, bases and salts conduct electricity.

It is not clear from the diagram that what is A and B. 'So, we cannot predict the actual solution. But if we compare with NCERT activity, this seems to be a potato and correct diagram is A because positive terminal makes the green spot on the potato.

Spoon should be connected to the negative terminal of the battery. The other electrode should be of silver so that silver ions get deposited on an iron spoon.

As the conducting solutions or electrolytes contain various types of salts which may be poisonous and also usually acidic in nature. So, in electroplating factories, the disposal of used conducting materials is a major problem and it should be disposed off in a proper way far away from the human population.

Yes, if current is not flowing through the air gap between the wires, it means that air is a poor conductor of electricity.
Air conducts electricity only when there is great voltage or there is some moisture in air.

By an electrolysis process, we use a thick rod of impure metal as anode and thin strip of pure metal as cathode. A water soluble salt of the metal is taken as electrolyte. On passing electric current, the metal dissolves from the impure anode and goes into electrolyte solution which then deposited on the cathode in pure form.

If the liquid between the two ends of a tester allows the electric current to pass, then the circuit of the tester becomes complete. The current flow in the circuit and the bulb glows. When the liquid does not allow the electric current to pass, the circuit of the tester is not complete and the bulb does not glow

As we know that the current produces the magnetic effect and causes the deflection in magnetic needle. In case of sea water, the salt content is much higher than that of drinking water. Thus, it produces more current than drinking water. Therefore, as a result, the deflection in magnetic needle is more in case of sea water rather than drinking water.

Since, tap water is a very good conductor of electricity. So, if the main electrical supply will remain ON, it can be fatal to human life because it can lead to electrocution due to water.

No, pure water does not conduct electricity because it has no dissolved salt in it. Hence, pure water can be made conducting by dissolving salt in it.