Class 7 Science Chapter 3 Electricity: Circuits and Their Components worksheet with MCQs, short answer questions, practice questions and extra questions based on the NCERT Curiosity textbook for revision and exam preparation.

Class 7 Science Worksheet

Chapter 3: Electricity: Circuits and their Components

NCERT Curiosity | Practice Worksheet

Name: __________________________
Class/Section: __________________
Date: ___________________________

Section A — Multiple Choice Questions

1. Which component is the source of electrical energy in a simple circuit?
(a) Switch
(b) Electric cell
(c) Connecting wire
(d) Lamp

2. Which part of an incandescent lamp becomes hot and glows?
(a) Glass bulb
(b) Filament
(c) Metal cap
(d) Connecting wire

3. What happens when a switch in a simple circuit is in the OFF position?
(a) The circuit is complete
(b) The circuit is broken
(c) The cell produces more current
(d) The lamp becomes brighter

4. Which of the following is generally a good conductor of electricity?
(a) Rubber
(b) Plastic
(c) Copper
(d) Glass

5. An LED generally glows when its terminals are connected:
(a) In any direction
(b) With correct polarity
(c) Without a battery
(d) Only through plastic

6. Which material is generally an electrical insulator?
(a) Copper
(b) Aluminium
(c) Iron
(d) Rubber

Section B — Fill in the Blanks

1. An electric circuit must be __________ for current to flow.

2. The two terminals of an electric cell are called the __________ terminal and the __________ terminal.

3. A combination of two or more electric cells is called a __________.

4. The thin wire inside an incandescent lamp is called its __________.

5. Materials through which electric current can pass easily are called electrical __________.

6. Materials that do not allow electric current to pass through them easily are called electrical __________.

Section C — True or False

1. A switch is the source of electrical energy in a circuit.

2. A closed circuit provides a complete path for electric current.

3. Plastic is generally a good conductor of electricity.

4. A battery can consist of more than one cell.

5. An LED can glow only when connected with the correct polarity.

6. Rubber covering on electrical wires helps protect us from electric current.

Section D — Match the Following

Column A	Column B
1. Electric cell	A. Breaks or completes a circuit
2. Switch	B. Allows current to pass easily
3. Filament	C. Source of electrical energy
4. Copper	D. Thin wire in an incandescent lamp
5. Rubber	E. Electrical insulator

Write the correct pairs:
1. ______ 2. ______ 3. ______ 4. ______ 5. ______

Section E — Very Short Answer Questions

1. What is an electric circuit?

2. Name the two terminals of an electric cell.

3. What is a battery?

4. What is the function of a switch?

5. What is the filament of an incandescent lamp?

6. What is an LED?

7. Give two examples of electrical conductors.

8. Give two examples of electrical insulators.

Section F — Short Answer Questions

1. Why does an electric lamp glow when the circuit is complete?

2. Why are electric wires usually covered with plastic or rubber?

3. Why can an LED glow in one direction of connection but not necessarily in the opposite direction?

4. What is the difference between a conductor and an insulator?

5. What happens if one connecting wire is disconnected from a simple circuit?

Section G — Think and Answer

1. A student connects a cell, lamp and switch using wires, but the lamp does not glow. List four possible reasons.

2. A student uses a metal spoon in a circuit and the lamp glows. What does this observation tell you about the spoon?

3. A student replaces the metal spoon with a rubber object and the lamp does not glow. What can you conclude?

4. Why is it important to connect the components of a circuit properly?

Section H — Circuit Practice

1. Write the names of four basic components that can be used to make a simple electrical circuit.

2. Arrange these components in the correct order to describe a simple closed circuit:
switch, connecting wires, electric cell, lamp

3. What is the difference between an open circuit and a closed circuit?

4. Draw a simple circuit diagram using symbols for:
• one electric cell
• one lamp
• one switch
• connecting wires

Draw here:

Section I — Application-Based Questions

1. Riya has three objects: a copper coin, a plastic ruler and a wooden stick. She wants to test which objects conduct electricity. Describe a simple activity she can perform.

2. A torch contains cells, a lamp, a switch and connecting parts. Explain how the switch controls the glowing of the lamp.

3. A battery has no visible ‘+’ and ‘–’ signs. Suggest a simple method to identify its two terminals using an LED.

4. Six cells are given. Some work and some do not. How could you test them one by one?

Section J — Challenge Questions

1. Two cells are connected together. Explain why the order in which their terminals are connected can matter in a circuit.

2. A lamp and a cell are both working, but the lamp still does not glow. Give as many possible reasons as you can.

3. Explain why metals are commonly used for the conducting parts of electrical wires while plastic or rubber is used as their covering.

Quick Revision

Term	Meaning
Electric cell	A source of electrical energy with positive and negative terminals.
Battery	A combination of two or more electric cells.
Electric circuit	A complete conducting path through which electric current can flow.
Switch	A device used to make or break a circuit.
Conductor	A material through which electric current can pass easily.
Insulator	A material that does not allow electric current to pass easily.
LED	A light-emitting diode that glows when connected correctly in a circuit.

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Class 7 Science Chapter 3 Worksheet | Electricity: Circuits and Their Components