Here are 10 one-word answer type questions from the topic Electric Current and Its Effects with their answers and explanations:
Topic: Electric Current and Its Effects
Electric current produces various effects like heating effect, magnetic effect, and chemical effect. Devices like electric fuses, electric bells, and electromagnets work based on these effects.
1. Question: What is the safety device used to prevent damage due to excessive current?
Answer: Fuse
Explanation: Fuse is a safety device that melts and breaks the circuit if excessive current flows, preventing fire and damage.
2. Question: Which scientist discovered the magnetic effect of electric current?
Answer: Oersted
Explanation: Hans Christian Oersted discovered that electric current creates a magnetic field around the wire.
3. Question: What is a current-carrying coil of wire wrapped around a piece of iron called?
Answer: Electromagnet
Explanation: When current passes through a coil of insulated wire wound around an iron piece, it behaves like a magnet and is called an electromagnet.
4. Question: Which effect of electric current is used in an electric heater?
Answer: Heating
Explanation: When current passes through a wire, it gets heated. This is called the heating effect of electric current.
5. Question: Which device automatically switches off when current exceeds a safe limit?
Answer: MCB
Explanation: Miniature Circuit Breaker (MCB) is a device that breaks the circuit when current exceeds the limit.
6. Question: What is produced when current flows through the filament of a bulb?
Answer: Heat
Explanation: The filament of the bulb gets heated due to the flow of current and starts glowing.
7. Question: In an electric bell, which part attracts the iron strip?
Answer: Electromagnet
Explanation: The electromagnet pulls the iron strip when the current flows, making the hammer strike the bell.
8. Question: What kind of wire is used in a fuse?
Answer: Low melting
Explanation: Fuse wires are made of materials with low melting points so that they melt quickly when large currents flow.
9. Question: What is the thin wire in an electric bulb called?
Answer: Filament
Explanation: The filament is the thin wire inside a bulb that glows when heated by electric current.
10. Question: What is the maximum safe limit of current flow controlled by?
Answer: Fuse
Explanation: The fuse breaks the circuit if the current exceeds the safe limit to prevent accidents.
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