20 Questions
What should you do if the bulb of the tester does not glow?
Check if the connections are tight
What is the purpose of replacing the bulb with a new one?
To check if the tester is working properly
Why should you not join the free ends of the tester for more than a few seconds?
To avoid draining the battery quickly
What is the purpose of using small plastic or rubber caps?
To provide a stable platform for the tester ends
What is the recommended distance between the tester ends when testing lemon juice or vinegar?
Less than 1 cm apart
What is the process of depositing a layer of any desired metal on another material by means of electricity called?
Electroplating
Why is electroplating considered a very useful process in industry?
It coats metal objects with a thin layer of a different metal, imparting desired properties.
Which metal is commonly used for chromium plating due to its shiny appearance and resistance to corrosion and scratches?
Chromium
Why is it not economical to make the whole object out of chromium even though it has desirable properties?
Chromium is expensive, so it would be cost-prohibitive.
What is the main reason jewellery makers use electroplating?
To give a cheaper metal the appearance and properties of a more expensive metal.
What is the purpose of using an electric tester to test lemon juice or vinegar?
To determine if the liquid is a good conductor of electricity
Why might the bulb not glow even if the circuit is complete?
Due to the weak current
Which property makes tap water conduct electricity?
Presence of dissolved minerals
What effect does electric current have on conducting solutions?
It can produce various effects
What happens when common salt is dissolved in distilled water?
The water becomes a good conductor
What did Boojho observe on the potato when one copper wire of a tester was inserted?
A greenish blue spot
What is the purpose of using copper sulphate and two copper plates in electroplating?
To act as an electrolyte and provide the metal ions for deposition
Why do electroplating factories need to properly dispose of the used conducting solution?
To prevent contamination of the environment
What is the primary purpose of electroplating?
To create a shiny surface on metals
Why did Boojho use a carbon rod instead of a copper plate for electroplating?
Due to unavailability of copper plate
Study Notes
- Boojho conducts an experiment to test if fruits and vegetables conduct electricity by using a potato.
- He observes a greenish blue spot on the potato where one copper wire of a tester was inserted.
- The experiment reveals that the positive terminal of a battery or cell can be identified by the presence of a greenish blue spot on the material when a current is passed through it.
- Electroplating is a process of depositing a metal coating onto another metal using an electric current.
- Copper sulphate and two copper plates are required for electroplating.
- When a current is passed through the copper sulphate solution, copper gets deposited on the electrode connected to the negative terminal and dissolves from the other electrode, maintaining the balance.
- Electroplating factories need to properly dispose of the used conducting solution due to its polluting nature.
- Electroplating is used to coat less expensive metals with silver or gold for decorative purposes and to coat tin onto iron to protect it from rusting.
- Boojho uses a carbon rod instead of a copper plate for electroplating due to unavailability of the latter.
Test your knowledge on testing the conductivity of fruits, vegetables, and solutions with this quiz. Explore the experiment involving the use of distilled water, bases, and sugar to test which substances conduct electricity.
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