Question

In daily life, dry cell is used in
(A) Fan
(B) Alarm clock
(C) Tube light
(D) All out(Mosquito repellant)

Answer 1

Hint:- The dry cells are commonly used in portable electronic devices. Therefore among the options we want to find which is portable and where the dry cells are used.

Complete step by step answer:
Dry cells convert the chemical energy to electrical energy. They are mainly used in portable electronic devices. And the dry cells are classified into primary and secondary cells. The primary cells once used cannot reuse and they are not rechargeable. This is because the reactants can take part only once in the chemical reaction.
Let’s see how the reaction takes place.
The dry cell has a graphite rod which acts as a positive electrode or cathode. And the graphite rod is covered by the low moisture electrolyte like ammonium chloride paste and manganese dioxide. This electrolyte and the graphite rod were placed inside the metal container. The metal container is made up of zinc. Thus the metal container acts as a negative electrode or anode. And the reaction is not reversible hence the primary cells are used at once.
Secondary cells are reusable. It is possible by charging the cell by using batteries. And at high temperatures the dry cells have the tendency for the self -discharging.
Among the options, the alarm clock is a portable device where dry cells only can be used.
In daily life, a dry cell is used in Alarm clocks.

The answer is option B.

Note: We have to note that the All out mosquito repellent is a portable device. But the device is connected to the plug directly.