30 Questions
What is a conductor in terms of electricity?
A material that allows electricity to flow through it
Why do electrons in conductors flow freely?
Because they are delocalized
What allows some materials to be classified as poor conductors?
Partial flow of electricity
Why are insulators unable to conduct electricity effectively?
Because they have tightly packed electrons
In what situations can air behave as a conductor of electricity?
During thunderstorms and lightning
Based on the text, why are some materials always classified as good and poor conductors rather than just conductors and insulators?
Because every material may conduct electricity in certain situations
What is the purpose of using LED bulbs in testing the electrical conductivity of liquids?
To detect even small amounts of electric current
Why would a filament not light up in a liquid that conducts electricity weakly?
Because the current passing through is not strong enough
What device can be used instead of LEDs to test electrical conductivity?
Galvanometer
What is the process called when components of a compound split due to passing an electric current?
Electrolysis
What is an electrolyte in the context of electricity?
A solution that breaks into ions under electricity
Which electrode is positively charged in an electrolytic cell?
Anode
What is the purpose of electroplating?
To deposit a layer of metal on another material
Why is distilled water considered a poor conductor of electricity?
It does not contain any salts or minerals to conduct electricity.
Why is it important to choose the right electrodes and electrolytes for electroplating?
To ensure the metal deposits correctly on the material
Which type of liquid is most likely to be a good conductor of electricity?
Salt water
Which of the following metals is NOT commonly used for electroplating?
Iron
What type of material should one of the electrodes be made of in electroplating?
Same as the metal in the electrolyte solution
Why are LED bulbs more suitable for testing electrical conductivity of liquids?
They are resistant to heating effects caused by the electric current.
Why is it necessary to ensure that the electrode chosen for electroplating is completely clean?
To facilitate better adhesion of the deposited metal
What happens when different substances are mixed in water and electricity is passed through them?
The substances form positive and negative ions in the water.
What happens if the wrong electrolyte is chosen for electroplating?
The metal may not deposit correctly
Why do solutions of acids or bases conduct electricity?
They form ions in the solution.
Why are sugar water, oil, and alcohol considered poor conductors of electricity?
They do not form any ions when mixed with water.
What does the observation that current does not flow in the circuit if there is a gap between the two wires indicate?
Air is a poor conductor of electricity
If Boojho passes an electric current through water without adding lemon juice, what difference would it make to his observations?
It would not make any difference
What does the deflection in the magnetic compass indicate in the circuit shown in Fig. 14.11 B?
Presence of an electric current
Why did the bulb not glow in the circuit shown in Fig. 14.11 A?
There was no electric current flowing
What effect would an increase in the number of turns in the coil wound around the magnetic compass have in Fig. 14.11 B?
Further increase in deflection of the magnetic compass
What will be observed if the number of cells are increased in the circuit shown in Fig. 14.11 B?
Increase in brightness of the bulb
Learn about how certain liquids can conduct electricity but may not be strong enough to heat up a filament, preventing it from lighting up. Discover how LED bulbs can detect even small amounts of electric current, making them suitable for testing the electrical conductivity of liquids.
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