Extra 30 short questions and answers from Chapter:12 Electricity and Circuits of Class 6 Science (CBSE):-
1. What is electricity?
Answer: Electricity is a form of energy that allows charges to flow through a conductor, enabling devices to work.
2. What is an electric circuit?
Answer: An electric circuit is a closed path in which electric current flows from a power source (battery) through a conductor, passing through electrical components like a bulb or switch.
3. What are the components of an electric circuit?
Answer: The main components of an electric circuit are:
Power source
(battery or cell)
Conducting wires
Switch
Load
(bulb, fan, or any electrical device)
4. Define conductors and give two examples.
Answer: Conductors are materials that allow electricity to pass through them easily. Examples: Copper, Aluminium.
5. Define insulators and give two examples.
Answer: Insulators are materials that do not allow electricity to pass through them. Examples: Plastic, Rubber.
6. What is the function of a switch in a circuit?
Answer: A switch is used to open or close an electric circuit. It helps in controlling the flow of electricity.
7. What are the two terminals of an electric cell?
Answer:
Positive terminal (+)
– Metal cap on top of the battery.
Negative terminal (-)
– Metal base of the battery.
8. What happens if an electric circuit is open?
Answer: When an electric circuit is open, the flow of electricity stops, and electrical devices do not work.
9. Why are electric wires covered with plastic?
Answer: Electric wires are covered with plastic because plastic is an insulator and prevents electric shocks.
10. What happens when you connect a bulb directly to a battery?
Answer: If connected properly, the bulb will glow because electricity flows through the circuit.
11. What is the function of a battery in an electric circuit?
Answer: A battery provides the necessary electrical energy to drive the current through the circuit.
12. What is a filament in an electric bulb?
Answer: The filament is a thin wire inside the bulb that glows when electricity passes through it.
13. Why does an electric bulb produce heat?
Answer: The filament in the bulb offers resistance to the flow of electricity, which generates heat and light.
14. What happens when the filament of a bulb breaks?
Answer: When the filament breaks, the circuit becomes incomplete, and the bulb does not glow.
15. What are the sources of electricity?
Answer:
Batteries (Cells)
– Used in torches, clocks, etc.
Power Stations
– Supply electricity to homes and industries.
16. Why does a bulb glow only when the circuit is complete?
Answer: A complete circuit allows continuous flow of electricity, which lights up the bulb.
17. What are the advantages of using a series circuit?
Answer:
Uses fewer materials.
Simple and easy to design.
18. What are the disadvantages of a series circuit?
Answer:
If one component stops working, the whole circuit stops.
The brightness of bulbs decreases when more bulbs are added.
19. What are the advantages of a parallel circuit?
Answer:
Each device works independently.
If one bulb fuses, others still work.
20. Why should we not use too many electrical devices in one socket?
Answer: It may cause overloading, leading to overheating and fire hazards.
21. What is the function of a fuse in an electrical circuit?
Answer: A fuse prevents excessive current flow and protects electrical appliances from damage.
22. What is a short circuit?
Answer: A short circuit occurs when a live wire and a neutral wire come in direct contact, allowing too much current to flow and causing overheating or fire.
23. How does a battery produce electricity?
Answer: A battery produces electricity through a chemical reaction between its internal substances, generating electrical energy.
24. Why do electric shocks occur?
Answer: Electric shocks occur when the human body comes in direct contact with an electrical source, as the body is a conductor of electricity.
25. What happens if you use a high-wattage bulb in a low-power socket?
Answer: The socket may overheat and cause electrical damage or fire.
26. Why should electrical appliances be handled with dry hands?
Answer: Water is a conductor of electricity. Touching electrical appliances with wet hands may cause electric shocks.
27. Why are electrical appliances connected in parallel in homes?
Answer:
Each appliance works independently.
If one device stops working, others continue to function.
28. What precautions should we take while using electricity?
Answer:
Do not touch electrical appliances with wet hands.
Avoid inserting metal objects into sockets.
Use proper insulation for electrical wiring.
29. Why do we need electric circuits?
Answer:
To provide a path for electricity to flow.
To operate electrical devices like bulbs, fans, and televisions.
30. What happens if we connect a wire directly from a battery's positive terminal to its negative terminal?
Answer:
A short circuit will occur.
The battery may overheat and get damaged.
