Olympiad Test: Chemical Effects Of Electric Current - Class 8 MCQ

Distilled water is a poor conductor  of electricity because it doesn't contain any dissolved salts in it which can provide it ions to conduct electricity.

Electricity is a term used to describe the energy produced (usually to perform work) when electrons are caused to directional (not randomly) flow from atom to atom. In fact, the day-to-day products that we all benefit from, rely on the movement of electrons. This movement of electrons between atoms is called electrical current. 

The correct option is A.
circuit A path through which electric charges flow. A continuous, unbroken path through which electrons can flow is a closed circuit. Charges, or current, can flow only through a closed circuit. A break or opening in a circuit creates an open circuit.

The electric bulb has a filament called tungsten when electricity passes through this filament, it heats up and glows. This heat is generated due to the passage of electric current and the drift of electrons due to the current and the resistance it causes.
Hence, the glowing of electric bulb is based on the heating effect of electric current.

If you run an electric current through a metal object, it exhibits magnetic behavior. However, simply passing current through iron doesn't make it magnetic. Yet, if you direct current through a coil wound around iron, it becomes magnetized. Even without iron in the coil, passing direct current through it generates a magnetic field akin to a magnet. Similarly, directing current through a coil around bismuth creates a magnet-like magnetic field.
 Electricity shows magnetic effect is true.

The process of depositing a thin layer of a desired metal over a metal object with the help of electric current is called electroplating. So, Electroplating is based on chemical effect of electricity.