Class 7 Science Chapter 3: Electricity: Circuits and their Components Important Questions by PW
Mishika Gupta30 Oct, 2026
Electricity and electric circuits are important topics in Class 7 Science, but understanding how different components work together can be challenging. You may find it difficult to distinguish between an electric cell and a battery, understand why a bulb glows only in a closed circuit or identify the role of switches and fuses. Questions about conductors, insulators and the direction of electric current also require a clear understanding of basic concepts.
Class 7 Science Chapter 3 Important Questions by PW on Electricity: Circuits and their Components provide practice through MCQs, fill-in-the-blanks, short-answer and long-answer questions. You can revise the functions of circuit components, understand how electric current flows and learn how electrical safety devices work to strengthen your concepts before school assessments.
Class 7 Science Chapter 3 Important Questions
Attempt the following questions from Electricity: Circuits and their Components to revise important concepts and practise different answer formats.
Q1. A bulb has:
-
(A) Two terminals and one filament
-
(B) Two terminals and two filaments
-
(C) Multiple terminals and a single filament
-
(D) A single terminal and one filament
Answer: (A) Two terminals and one filament
A bulb has two terminals connected to the circuit and a filament that glows when electric current passes through it.
Q2. The filament of an electric bulb is made of:
-
(A) Aluminium
-
(B) Chromium
-
(C) Platinum
-
(D) Tungsten
Answer: (D) Tungsten
Tungsten is used because it has a very high melting point and can withstand the high temperatures produced when electric current passes through the filament.
Q3. A bulb glows only in a:
-
(A) Closed circuit
-
(B) Open circuit
-
(C) Both open and closed circuits
-
(D) Open circuit if the bulb is not fused
Answer: (A) Closed circuit
A closed circuit provides a complete path for electric current to flow through the bulb, allowing it to glow.
Q4. A battery is:
-
(A) A single electric cell
-
(B) A combination of cells connected with the positive terminal of one cell joined to the negative terminal of another
-
(C) A combination of cells connected with their positive terminals together
-
(D) None of these
Answer: (B) A combination of cells connected with the positive terminal of one cell joined to the negative terminal of another
A battery consists of two or more cells connected together to provide electrical energy to a circuit.
Q5. An electric cell has two terminals, a positive and a __________.
Answer: Negative.
Q6. Materials through which electric current can pass are called __________.
Answer: Conductors.
Q7. Materials through which electric current cannot pass easily are called __________.
Answer: Insulators.
Q8. Our body is a __________ conductor of electricity.
Answer: Good.
3. Short Answer Type Questions
Q9. Differentiate between an electric cell and a battery.
Answer:
-
Electric cell: It is a single unit that produces electrical energy through chemical reactions and has positive and negative terminals.
-
Battery: It is a combination of two or more electric cells connected together to supply electrical energy.
Q10. What is an electric circuit?
Answer: An electric circuit is a complete path through which electric current flows. It connects the positive and negative terminals of an electric cell through connecting wires and electrical components such as a bulb and a switch.
Q11. What is the direction of conventional current in an electric circuit?
Answer: Conventional current is considered to flow from the positive terminal to the negative terminal of an electric cell through the external circuit.
Q12. What is a conductor? Give examples.
Answer: A conductor is a material that allows electric current to pass through it easily. Examples include copper, aluminium, zinc and iron.
Q13. What is an insulator? Give a few examples.
Answer: An insulator is a material that does not allow electric current to pass through it easily. Examples include rubber, plastic, dry wood and glass.
Q14. Is air a good or a bad conductor of electricity? Explain.
Answer: Air is generally a poor conductor of electricity under normal conditions. It does not allow electric current to pass through it easily. This is why electrical wires are insulated and appliances require proper conducting paths to operate. However, air can become conductive under certain conditions, such as during a lightning strike, when a very high voltage causes electrical breakdown.
Q15. What is the purpose of an electric switch? Name some electrical gadgets that have switches built into them.
Answer: An electric switch is used to open or close an electric circuit. It controls the flow of current and allows an electrical appliance to be turned on or off.
Some electrical gadgets with built-in switches include:
-
Electric iron
-
Table fan
-
Television
-
Radio
-
Washing machine
Class 7 Science Chapter 3 Important Questions PDF
Revise the important concepts from Electricity: Circuits and their Components with the Class 7 Science Chapter 3 Important Questions PDF by PW. The PDF provides chapter-based questions to help you practise different concepts, check your understanding and prepare for school examinations.
Electricity: Circuits and their Components Important Questions PDF
Study without using the internet
How Can Class 7 Science Chapter 3 Important Questions by PW Help You?
Practising these questions can help you understand how electric circuits work and identify the functions of their different components. Regular revision can also improve your ability to explain scientific concepts and solve chapter-based questions.
-
Understand Electric Circuits: Learn how electric cells, wires, bulbs and switches form a complete circuit.
-
Revise Circuit Components: Recall the functions of cells, batteries, filaments and switches.
-
Differentiate Conductors and Insulators: Identify materials that allow or restrict the flow of electric current.
-
Learn Current Direction: Understand the direction of conventional current in an electric circuit.
-
Understand Electrical Safety: Learn how fuses protect circuits from excessive current.
-
Improve Conceptual Clarity: Connect the working of electrical components with familiar household appliances.
-
Practise Different Question Formats: Prepare for MCQs, fill-in-the-blanks, short-answer and long-answer questions.
-
Strengthen Exam Preparation: Revise important chapter concepts and improve answer-writing accuracy.
A clear understanding of electric cells, circuits and their components is essential for learning the basics of electricity. Practise the Class 7 Science Chapter 3 Important Questions by PW, revise key concepts and check your answers to improve accuracy. Regular revision can help you build confidence and prepare effectively for school assessments.
Related Resources
-
CBSE Class 7 Science Sample Papers
-
CBSE Class 7 Science NCERT Solutions
Class 7 Science Chapter 3 Important Questions FAQs
What is the difference between an electric cell and a battery?
Why does a bulb glow only in a closed circuit?
What are conductors and insulators?
What is the function of a fuse in an electric circuit?
Have questions about your prep?
Our experts can answer all your questions
Get Free Counselling Today
and Clear up all your Doubts
Live & recorded classes available at easeDashboard for progress trackingLakhs of practice questions
