At Bodhiclasses, we believe learning science should not just be about remembering facts—it should be about understanding and application. Our goal is to empower students with high-quality, curriculum-aligned, exam-focused content that boosts clarity, confidence, and curiosity. In this post, we bring to you a comprehensive set of extra practice questions from Chapter 3: “Electricity: Circuits and Their Components” (Grade 7 Science), designed for thorough revision and conceptual mastery.
Extra Questions: Electricity – Circuits and Their Components
1-10 Multiple Choice Questions (MCQs) with Answers
- What is the correct sequence to form a working battery from two cells?
- (A) Positive to Positive
- (B) Negative to Negative
- (C) Positive to Negative ✔
- (D) Any sequence
- Which part of the incandescent lamp glows when electricity flows?
- (A) Base
- (B) Filament ✔
- (C) Glass
- (D) Terminal
- What is the function of a switch in a circuit?
- (A) Store current
- (B) Stop electricity permanently
- (C) Open or close the circuit ✔
- (D) None of the above
- Which of the following is an electrical insulator?
- (A) Iron rod
- (B) Copper wire
- (C) Wooden block ✔
- (D) Aluminum foil
- Which is NOT a source of electricity?
- (A) Waterfall
- (B) Windmill
- (C) Rubber ✔
- (D) Solar panel
- LED allows current to pass:
- (A) Both directions
- (B) Only when cold
- (C) In one direction only ✔
- (D) Only in complete circuits
- What does a long line in a cell symbol represent?
- (A) Ground
- (B) Negative Terminal
- (C) Positive Terminal ✔
- (D) Filament
- Which material is a good conductor of electricity?
- (A) Plastic
- (B) Rubber
- (C) Copper ✔
- (D) Paper
- A fuse in a circuit is used to:
- (A) Increase voltage
- (B) Prevent overheating ✔
- (C) Switch devices on
- (D) Power LED
- Which of the following flows in a circuit?
- (A) Sound
- (B) Light
- (C) Electricity ✔
- (D) Magnetism
11-20 MCQ Extra Questions: Electricity – Circuits and Their Components
- Why are wires coated with rubber?
- (A) To make them shiny
- (B) To conduct better
- (C) To prevent shock ✔
- (D) To reduce cost
- Which of these is NOT part of a basic electric circuit?
- (A) Bulb
- (B) Switch
- (C) Magnet ✔
- (D) Cell
- Which of the following devices commonly uses button cells?
- (A) Fan
- (B) Torch
- (C) Wall clock
- (D) Wristwatch ✔
- Electric current in symbols flows:
- (A) Negative to positive
- (B) From earth to sky
- (C) Positive to negative ✔
- (D) In zig-zag
- The symbol for an LED includes:
- (A) Arrows showing light emission ✔
- (B) Coils
- (C) Dots
- (D) Parallel bars
- Which of these will allow a lamp to glow?
- (A) Open circuit
- (B) Incomplete wires
- (C) Closed circuit ✔
- (D) Plastic insulators
- If the filament breaks, the lamp:
- (A) Glows more
- (B) Emits sound
- (C) Fuses ✔
- (D) Becomes a switch
- Why are copper wires commonly used?
- (A) They’re cheap
- (B) Poor conductors
- (C) Strong insulation
- (D) Excellent conductivity ✔
- Which tool is best for testing conductivity?
- (A) Switch
- (B) Conduction tester ✔
- (C) Magnifier
- (D) Thermometer
- LEDs are more energy-efficient than incandescent lamps because:
- (A) They use more wires
- (B) No light is emitted
- (C) They waste less energy as heat ✔
- (D) They use larger batteries
Chapter 3: “Electricity: Circuits and Their Components”
One Mark Questions (with Answers)
- What are the two terminals of an electric cell called?
Ans: Positive and negative terminals. - What does LED stand for?
Ans: Light Emitting Diode. - What happens when a switch is turned OFF?
Ans: The circuit is broken and current stops flowing. - What is a filament?
Ans: A thin wire in a bulb that glows when heated by electric current. - Name one good conductor of electricity.
Ans: Copper. - Name one insulator.
Ans: Rubber. - What is the direction of conventional current?
Ans: From the positive terminal to the negative terminal. - What is a circuit diagram?
Ans: A symbolic representation of an electric circuit. - Why do we not use iron for electrical wires?
Ans: It is not as good a conductor as copper and can rust. - Name a safety device used in circuits.
Ans: Fuse. - What powers a torchlight?
Ans: Electric cells or batteries. - What is meant by an open circuit?
Ans: A circuit where the flow of electricity is interrupted. - What prevents electrical shocks in household wiring?
Ans: Insulating material like plastic or rubber. - What does a glowing bulb indicate in a circuit?
Ans: Current is flowing and the circuit is complete. - Can a plastic scale conduct electricity?
Ans: No, it is an insulator.
Chapter 3: “Electricity: Circuits and Their Components”
Two Mark Questions (with Answers)
- Differentiate between a cell and a battery.
Ans: A cell is a single unit that produces electricity. A battery is a combination of two or more cells connected in series or parallel. - Why is a circuit incomplete without a switch?
Ans: The switch allows control of current flow. Without it, you cannot open or close the circuit. - State two uses of circuit diagrams.
Ans: Circuit diagrams help represent components simply and allow universal understanding of electric connections. - Why do we use metal wires in circuits?
Ans: Metals are good conductors of electricity and allow current to flow easily. - What makes LEDs more efficient than filament bulbs?
Ans: LEDs emit light without producing much heat, making them energy-efficient. - How can you test if an object is a conductor?
Ans: Use a simple conduction tester. If the bulb glows, the object is a conductor. - Explain why rubber is used to cover wires.
Ans: Rubber is an insulator and prevents electrical shocks by not allowing current to escape. - What happens if the filament of a lamp breaks?
Ans: The circuit is incomplete, and the lamp will not glow. - Why do torch cells need to be placed in a particular order?
Ans: To ensure the correct polarity and allow current to flow properly in the circuit. - How is current direction different in LED circuits compared to filament bulbs?
Ans: LEDs work only when current flows in one direction; filament bulbs glow in both directions if the circuit is complete.
Chapter 3: “Electricity: Circuits and Their Components”
Higher Order Thinking Skills (HOTS) Questions (with Answers)
- Why might a lamp not glow even when the circuit is closed?
Ans: The lamp could be fused, wires may be loose, the cell may be dead, or the connections may not be correct. - If an LED is glowing dimly, what could be the reason?
Ans: The battery might be weak or the LED might not be receiving enough current due to resistance in the wires. - What improvements can be made to a torch to increase its efficiency?
Ans: Use LEDs instead of filament bulbs, include a rechargeable battery, and design a better switch mechanism. - How can we design a safe circuit for children to learn electricity?
Ans: Use low-voltage batteries, insulated wires, LED lamps, and a circuit board with clearly marked terminals and a switch. - In a blackout, which type of lamp would be more helpful and why—LED or filament?
Ans: LED, because it consumes less power and can operate longer on battery backup.
Understanding the chapter Electricity: Circuits and Their Components is essential for building a strong foundation in science. It not only introduces students to the basic principles of electric circuits, but also nurtures logical thinking, problem-solving skills, and practical awareness of how electricity works in everyday life. Through our curated MCQs, one-mark, two-mark, and HOTS questions, students can deepen their grasp of this vital topic and prepare confidently for exams.
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