CBSE Class 7 Science Chapter 3: Electricity: Circuits and their Components — Assertion & Reason
CBSE Class 7 Science Assertion & Reason
Expert crafted · Instant PDF download · 2026-27
The following Assertion and Reason questions are based on Chapter 3: Electricity: Circuits and their Components from the NCERT Class 7 Science textbook Curiosity. Each question has four options — read both the Assertion (A) and Reason (R) carefully before selecting your answer.
How to attempt Assertion & Reason questions:
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is NOT the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is NOT the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Assertion & Reason Questions
1
Assertion (A): We use electricity for multiple purposes like cooking, lighting, and transportation.
Reason (R): Electricity is a versatile form of energy that can be generated from various sources like wind, water, and sunlight.
Reason (R): Electricity is a versatile form of energy that can be generated from various sources like wind, water, and sunlight.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Electricity is highly useful in daily life precisely because it is a versatile energy form that can be produced in many ways and transmitted easily to our homes.
2
Assertion (A): The metal cap of an electric cell acts as its positive terminal.
Reason (R): Every electric cell has two terminals: a positive terminal and a negative terminal.
Reason (R): Every electric cell has two terminals: a positive terminal and a negative terminal.
Answer: (b)
Both A and R are true, but R is NOT the correct explanation of A. While both statements are true, the fact that a cell has two terminals does not explain why the metal cap specifically is chosen to be the positive one.
3
Assertion (A): A battery is formed by connecting the positive terminal of one cell to the positive terminal of another cell.
Reason (R): A battery is a combination of two or more electric cells connected together.
Reason (R): A battery is a combination of two or more electric cells connected together.
Answer: (d)
A is false, but R is true. A battery is indeed a combination of cells, but they must be connected correctly: the positive terminal of one cell must connect to the negative terminal of the next.
4
Assertion (A): The filament of an incandescent lamp gets hot and glows to produce light.
Reason (R): When electric current passes through the thin filament wire, it heats up and emits light.
Reason (R): When electric current passes through the thin filament wire, it heats up and emits light.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The physical heating of the thin wire filament by the electric current is exactly what causes an incandescent lamp to glow.
5
Assertion (A): An LED lamp has a tiny filament inside its bulb that glows when electricity passes through it.
Reason (R): LEDs emit light only when they are connected correctly in an electrical circuit.
Reason (R): LEDs emit light only when they are connected correctly in an electrical circuit.
Answer: (d)
A is false, but R is true. Unlike incandescent lamps, LEDs do not have filaments. However, it is true that they must be connected in the correct direction to emit light.
6
Assertion (A): When connecting an LED in a circuit, the longer wire is connected to the positive terminal of the battery.
Reason (R): Electric current can pass through an LED in one direction only.
Reason (R): Electric current can pass through an LED in one direction only.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Because an LED only allows current to flow in one direction, its terminals must be connected specifically—the longer wire to the positive and the shorter to the negative.
7
Assertion (A): An electrical circuit provides a complete path for electric current to flow through a lamp.
Reason (R): A lamp will glow only when current successfully passes through the closed circuit.
Reason (R): A lamp will glow only when current successfully passes through the closed circuit.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. A closed, continuous loop (circuit) is required for electricity to travel from the source through the lamp, making it light up.
8
Assertion (A): The direction of electric current in a circuit is taken to be from the negative to the positive terminal of the cell.
Reason (R): Current flows only when the electrical circuit is complete.
Reason (R): Current flows only when the electrical circuit is complete.
Answer: (d)
A is false, but R is true. By scientific convention, the direction of electric current in a closed circuit is taken to be from the positive terminal to the negative terminal, not the other way around.
9
Assertion (A): A fused incandescent lamp does not glow even when connected properly to a working cell.
Reason (R): A fused lamp has a broken filament which creates a gap in the circuit, preventing the flow of current.
Reason (R): A fused lamp has a broken filament which creates a gap in the circuit, preventing the flow of current.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The broken filament acts like an open switch, breaking the complete path required for electricity to flow.
10
Assertion (A): A switch is a simple device that either completes or breaks an electrical circuit.
Reason (R): A switch acts as the primary source of electric current in a circuit.
Reason (R): A switch acts as the primary source of electric current in a circuit.
Answer: (c)
A is true, but R is false. A switch completes or breaks a circuit, but it does not provide electricity. The electric cell or battery is the source of the electric current.
11
Assertion (A): When a switch is in the 'OFF' position, the electrical circuit is said to be closed.
Reason (R): In the 'OFF' position, there is a gap in the circuit that prevents the flow of current.
Reason (R): In the 'OFF' position, there is a gap in the circuit that prevents the flow of current.
Answer: (d)
A is false, but R is true. When a switch is in the 'OFF' position, the circuit is open (broken), not closed. A closed circuit allows current to flow.
12
Assertion (A): In a circuit diagram, an electric cell is represented by two parallel vertical lines of equal length.
Reason (R): A circuit diagram uses standard symbols to make it easier to draw and understand electrical connections.
Reason (R): A circuit diagram uses standard symbols to make it easier to draw and understand electrical connections.
Answer: (d)
A is false, but R is true. In the symbol for an electric cell, the lines are of unequal length: a longer line for the positive terminal and a shorter, thicker line for the negative terminal.
13
Assertion (A): Copper is widely used to make electrical wires.
Reason (R): Copper is a good conductor of electricity, has a comparatively lower cost, and is available in abundant supply.
Reason (R): Copper is a good conductor of electricity, has a comparatively lower cost, and is available in abundant supply.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Copper's excellent conductivity, combined with its affordability and availability, makes it the standard material for electrical wiring.
14
Assertion (A): The electrical wires used in our homes are covered with plastic or rubber.
Reason (R): Plastic and rubber are excellent conductors of electricity.
Reason (R): Plastic and rubber are excellent conductors of electricity.
Answer: (c)
A is true, but R is false. Wires are covered with plastic and rubber because these materials are insulators (poor conductors), which protect us from getting electric shocks.
15
Assertion (A): We should never touch electrical switches or plugs with wet hands.
Reason (R): The human body and water can conduct electricity, which may cause a severe electric shock.
Reason (R): The human body and water can conduct electricity, which may cause a severe electric shock.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Because our bodies conduct electricity, touching an active electrical source with wet hands provides a path for dangerous current to pass through us.
16
Assertion (A): A conduction tester can be used to identify if an unknown material is a conductor or an insulator.
Reason (R): If the lamp in the tester glows when a material is inserted into the circuit gap, the material is a conductor.
Reason (R): If the lamp in the tester glows when a material is inserted into the circuit gap, the material is a conductor.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The glowing lamp proves that the inserted material has successfully completed the electrical path, which is the defining property of a conductor.
17
Assertion (A): Materials like cork, glass, and wood are classified as electrical insulators.
Reason (R): Insulators are materials that do not allow electric current to pass through them.
Reason (R): Insulators are materials that do not allow electric current to pass through them.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Cork, glass, and wood block the flow of electricity, which perfectly fits the definition of an electrical insulator.
18
Assertion (A): Silver and gold are considered the best electrical conductors but are rarely used for common household wiring.
Reason (R): These metals are too poor at conducting electricity to be used in large appliances.
Reason (R): These metals are too poor at conducting electricity to be used in large appliances.
Answer: (c)
A is true, but R is false. Silver and gold are actually the best conductors of electricity. They are not used for common wiring because they are extremely expensive, not because they are poor conductors.
19
Assertion (A): The electricity from a torch battery is exactly the same type as the electricity coming from a wall socket.
Reason (R): Electricity from batteries is Direct Current (DC), while electricity from power plants is Alternating Current (AC).
Reason (R): Electricity from batteries is Direct Current (DC), while electricity from power plants is Alternating Current (AC).
Answer: (d)
A is false, but R is true. The electricity is not the same; battery power is Direct Current (DC), while wall socket power is Alternating Current (AC).
20
Assertion (A): In the circuit symbol for an LED, the two small arrows point outwards away from the diode symbol.
Reason (R): The outward-pointing arrows indicate that light is emitted by the LED.
Reason (R): The outward-pointing arrows indicate that light is emitted by the LED.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The specific symbol for a Light Emitting Diode uses outward arrows to visually represent the emission of light rays.
❓ Frequently Asked Questions
What is covered in CBSE Class 7 Science Chapter 3 Electricity: Circuits and their Components?
This chapter covers all key topics from Electricity: Circuits and their Components as per CBSE 2026-27 syllabus.
Is this Assertion & Reason useful for CBSE board exams?
Yes, designed for CBSE Class 7 board exam preparation covering the complete syllabus.
Are these CBSE Class 7 Science Assertion & Reason updated for 2026-27?
Yes, all content at eBookPublisher is updated as per the latest 2026-27 CBSE syllabus.
How many chapters are in CBSE Class 7 Science?
All chapters of CBSE Class 7 Science are covered at eBookPublisher with free Assertion & Reason for each chapter.
Can I study Electricity: Circuits and their Components online for free?
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