Here are 10 one-word answer type questions from the topic Electric Bell with their answers and explanations:
Topic: Electric Bell
An electric bell works on the principle of the magnetic effect of electric current. It uses an electromagnet to produce sound. The working of an electric bell involves the repeated making and breaking of an electric circuit.
1. Question: Which magnetic device is used in an electric bell?
Answer: Electromagnet
Explanation: An electromagnet is used in an electric bell to attract an iron strip and ring the bell.
2. Question: What strikes the gong to produce sound in an electric bell?
Answer: Hammer
Explanation: The hammer attached to the iron strip strikes the gong when the electromagnet pulls the strip.
3. Question: Which part of the bell completes and breaks the circuit repeatedly?
Answer: Iron strip
Explanation: The iron strip moves towards the electromagnet, breaking the circuit and then returning to complete it again.
4. Question: What is produced when the hammer strikes the gong?
Answer: Sound
Explanation: The hammer strikes the gong to produce sound in an electric bell.
5. Question: What happens to the circuit when the iron strip touches the contact screw?
Answer: Complete
Explanation: When the iron strip touches the contact screw, the electric circuit gets completed, allowing current to flow.
6. Question: What happens to the electromagnet when the current stops flowing?
Answer: Demagnetised
Explanation: The electromagnet loses its magnetism when the current stops flowing.
7. Question: What is the source of electric current in an electric bell circuit?
Answer: Battery
Explanation: A battery is used to provide electric current to the electric bell circuit.
8. Question: What effect of electric current is used in an electric bell?
Answer: Magnetic
Explanation: The magnetic effect of electric current is used in the working of an electric bell.
9. Question: Which metallic part returns to its original position after being pulled by the electromagnet?
Answer: Iron strip
Explanation: The iron strip returns to its original position when the electromagnet loses its magnetism.
10. Question: What is produced repeatedly in the bell due to the making and breaking of the circuit?
Answer: Sound
Explanation: The repeated making and breaking of the circuit causes the hammer to strike the gong again and again, producing sound.
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