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Important Questions Chapter 3 Class 7 Science Curiosity NCERT

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Electricity: Circuits and their Components


Short Questions

1. What is an electric cell?

Answer: A portable source of electrical energy.

2.What are the two terminals of an electric cell called?

Answer: Positive (+ve) and negative (–ve).

3.What is a battery?

Answer: A combination of two or more electric cells.

4.What makes an incandescent lamp glow?

Answer: A thin wire called the filament gets hot and glows.

5.What is an LED?

Answer: A Light Emitting Diode that glows when current passes in one direction.

6.What does a switch do in a circuit?

Answer: It completes or breaks the circuit.

7.What is an electrical circuit?

Answer: A complete path for electric current to flow.

8.What are conductors?

Answer: Materials that allow electric current to flow easily.

9.What are insulators?

Answer: Materials that do not allow electric current to flow.

10. What is a circuit diagram?

Answer: A drawing of an electrical circuit using symbols.


Long Questions

1. Why does a torch lamp glow when the switch is turned on?

Answer: The switch completes the circuit, allowing current to flow through the lamp. This makes the filament or LED glow.

2.How is an LED different from an incandescent lamp?

Answer: An LED has no filament and glows only when connected correctly. An incandescent lamp has a filament that glows when heated.

3.Why are electric wires covered with plastic or rubber?

Answer: Plastic and rubber are insulators that prevent electric shocks. They stop current from leaking or touching other objects.

4.How can you test if a material is a conductor or insulator?

Answer: Connect the material in a circuit with a lamp and cell. If the lamp glows, it’s a conductor; if not, it’s an insulator.

5.What happens if the filament of an incandescent lamp is broken?\

Answer: The lamp will not glow because the broken filament stops the current. This is called a “fused” lamp.

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