Electricity in Daily Life

1. In house wiring, what color is the live wire generally?

• A) Black
• B) Green
• C) Red
• D) Blue

2. How is one watt of electric power defined?

• A) The power of a device when one joule of energy is used per hour.
• B) The power when a potential difference of 220 volts causes a flow of one ampere.
• C) The power when a potential difference of one volt causes one ampere of current to flow.
• D) The power required to light a standard energy-saving bulb.

3. What is the term for the work done per unit time by an electric machine?

• A) Electric energy
• B) Electric power
• C) Potential difference
• D) Electric current

4. According to the scientist Arrhenius, what happens to compounds like acids, bases, and some salts when they are dissolved in a liquid?

• A) They lose their chemical properties and become inert.
• B) They immediately solidify and precipitate out of the solution.
• C) They are ionized and divided into equal amounts of positively and negatively charged ions.
• D) They conduct electricity without any change to their molecular structure.

5. What happens to the total potential (voltage) when multiple battery cells are connected in series?

• A) The potential decreases
• B) The potential remains the same as a single cell
• C) The potential of each cell is added together
• D) The flow of electricity stops

6. Why is a parallel circuit system, rather than a series circuit, used for electrical connections in a house?

• A) Because a series circuit uses more electricity overall.
• B) Because in a series circuit, all devices turn on and off together and do not receive the necessary voltage.
• C) Because a parallel circuit is easier to install inside the walls.
• D) Because a series circuit can only handle DC supply, not AC supply.

7. What is the process of coating a metal with another suitable metal using electricity called?

• A) Electrolysis
• B) Electrotyping
• C) Electroplating
• D) Metal purification