CBSE Class 7 Science Chapter 03 Electricity Circuits And Their Components MCQs Set 02

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Chapter-wise Objective Questions: Chapter 03 Electricity Circuits And Their Components

Navigate directly to the 50 objective questions for Chapter 03 Electricity Circuits And Their Components using the digital viewer below. Each practice set includes verified answer keys, allowing students to instantly cross-check their work and identify areas requiring further revision.

Question: At the hydroelectric power house visited during the school trip, the generation of electricity depends on which physical phenomenon involving water?
A. the temperature of water
B. the force exerted by falling water
C. the salt content in water
D. the speed of water evaporation
Show Answer & Explanation

Answer: (B) the force exerted by falling water

Explanation:
The chapter explicitly states that at the hydroelectric power house, 'the force of falling water was used to generate electricity,' making this the key principle behind electricity generation at that location.

Question: When Nihal's group examined components inside a torchlight after opening it, what did they find as the portable source of electrical energy?
A. wires and plastic covering
B. one or more electric cells
C. a metal conducting strip
D. a protective rubber casing
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Answer: (B) one or more electric cells

Explanation:
The chapter describes that upon opening the torchlight, 'Inside the torchlight, you may find two or more electric cells,' which serve as the portable source of electrical energy for the device.

Question: In an electric cell, the flat metal disc at the base corresponds to which terminal?
A. positive terminal
B. negative terminal
C. neutral terminal
D. grounding terminal
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Answer: (B) negative terminal

Explanation:
The chapter states: 'The metal cap is the positive terminal of the electric cell and the metal disc is the negative terminal,' establishing the correspondence between the flat disc and the negative terminal.

Question: When multiple cells are arranged to form a battery as shown in Fig. 3.3, the positive terminal of one cell connects to which part of the adjacent cell?
A. the positive terminal of the next cell
B. the negative terminal of the next cell
C. the glass covering of the next cell
D. the metal casing of the next cell
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Answer: (B) the negative terminal of the next cell

Explanation:
• The positive terminal of one cell must connect to the negative terminal of the next cell
• This specific arrangement is what allows the battery to function properly and the lamp to glow
• Any other arrangement fails to complete the circuit correctly

Question: What happens to the filament of an incandescent lamp when electric current flows through it?
A. it becomes cooler and contracts
B. it gets hot and glows to produce light
C. it remains at room temperature
D. it vibrates without producing heat
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Answer: (B) it gets hot and glows to produce light

Explanation:
In such incandescent lamps, the filament gets hot and glows to produce light, which is the fundamental operating principle that allows them to illuminate.

Question: Which characteristic allows LEDs and incandescent lamps to be used interchangeably in the same circuit without any modifications?
A. both have identical internal structures
B. both require the same voltage to operate
C. both have two terminals for connection
D. both emit light at the same brightness level
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Answer: (C) both have two terminals for connection

Explanation:
Both types have two terminals for connection to the circuit, though their internal structures and polarity requirements differ. Incandescent lamps work regardless of terminal orientation, while LEDs require correct polarity alignment.

Question: In Activity 3.7, when the LED failed to glow despite being connected to the battery, what was the likely reason?
A. the battery had insufficient energy
B. the wires were too long
C. the terminals were connected in the wrong direction
D. the LED required a different color battery
Show Answer & Explanation

Answer: (C) the terminals were connected in the wrong direction

Explanation:
The chapter explains that 'the current can pass through the LED in one direction only' and that reversing the connections prevents the LED from glowing, demonstrating that polarity matters for LEDs unlike incandescent lamps.

Question: During the conduction tester activity, when the lamp glowed after touching both ends of a material with the wire ends, what could be concluded about that material?
A. it was an insulator protecting against electricity
B. it was a good conductor of electricity
C. it was a semiconductor material
D. it had no effect on electrical flow
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Answer: (B) it was a good conductor of electricity

Explanation:
Materials allowing current to pass through, causing the lamp to glow, are classified as good conductors or conductors of electricity. The opposite—materials preventing glow—are insulators.

Question: Why is electricity from power supply outlets specifically avoided for experiments, with only batteries or cells recommended instead?
A. wall outlet electricity is weaker than battery electricity
B. batteries are cheaper and more economical
C. wall outlet electricity is more dangerous due to higher voltage and power
D. cells produce a different color of light
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Answer: (C) wall outlet electricity is more dangerous due to higher voltage and power

Explanation:
The caution states that while electricity from portable generators can be dangerous, the chapter emphasizes that home power supplies pose even greater hazard, making cells and batteries the safer choice for learning experiments.

Question: In a circuit diagram, if you observe a symbol showing two parallel lines of different lengths connected to a component, what does this represent?
A. a switch in the ON position
B. an electric cell with positive and negative terminals
C. two wires crossing without connecting
D. an LED with its two leads
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Answer: (B) an electric cell with positive and negative terminals

Explanation:
The chapter specifies that 'In the symbol for an electric cell, the long line represents the positive terminal, while the short line represents the negative terminal,' making this the standard convention for cell representation.

Question: When plastic or rubber covering is applied around electrical wires in household circuits, which safety outcome does this primarily achieve?
A. it increases the conductivity of the wires
B. it reduces the cost of wire production
C. it prevents accidental contact with the conducting metal and protects from electric shocks
D. it makes the wires stronger and more durable
Show Answer & Explanation

Answer: (C) it prevents accidental contact with the conducting metal and protects from electric shocks

Explanation:
Insulators like rubber, plastics, and ceramics are used to cover wires to protect people from electric shocks and prevent dangerous contact with the conductive material inside.

Question: In a torch that uses two cells, why is connecting them in the correct order (positive of one to negative of the next) more effective than placing them side by side?
A. side by side placement wastes space
B. the correct order provides more energy for a longer time or greater energy output
C. side by side placement creates dangerous short circuits
D. the order has no effect on energy delivery
Show Answer & Explanation

Answer: (B) the correct order provides more energy for a longer time or greater energy output

Explanation:
The chapter explains that 'Connecting more than one cell provides energy to the circuit for a longer time and/or more energy,' which is the advantage of the series arrangement used in torches.

Question: If you were designing a simple switch for a circuit, which property would be most essential for the moving part of your switch?
A. it must be made of rubber to insulate
B. it must be able to complete or break the circuit by touching or separating contacts
C. it must be transparent so you can see inside
D. it must generate its own electrical energy
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Answer: (B) it must be able to complete or break the circuit by touching or separating contacts

Explanation:
A switch is fundamentally a device that either completes or breaks a circuit path. The moving component must be capable of establishing or interrupting electrical contact to function properly.

Question: Inside battery compartments in devices, what visual markers help users place cells correctly?
A. colored stickers on the compartment
B. numbered labels on each cell
C. plus and minus symbols typically printed inside the compartment
D. photographs showing correct arrangement
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Answer: (C) plus and minus symbols typically printed inside the compartment

Explanation:
The 'Dive Deeper' section mentions that 'To help with proper placement, "+" and "–" symbols are typically printed inside' the battery compartment to guide correct cell orientation.

Question: Why can incandescent lamps glow regardless of which terminal connects to positive or negative, while LEDs cannot?
A. LEDs are older technology with stricter requirements
B. current in LEDs must flow in a specific direction for the component to function
C. incandescent lamps use different materials that work bidirectionally
D. this difference is purely accidental and has no real purpose
Show Answer & Explanation

Answer: (B) current in LEDs must flow in a specific direction for the component to function

Explanation:
• Incandescent lamps work because heat production doesn't depend on current direction
• LEDs have internal structure that only allows current flow in one specific direction
• Reversing LED connections blocks current completely, preventing light emission

Question: What would happen to an electrical circuit if all the wires were covered with plastic insulation without any exposed metal segments?
A. the circuit would work more safely
B. the lamp would not glow because current cannot pass through insulation
C. the battery would charge faster
D. the switch would become more sensitive
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Answer: (B) the lamp would not glow because current cannot pass through insulation

Explanation:
For current to flow through a circuit, it must travel through conducting material. If wires were completely insulated with no exposed metal for connections, current could not pass to complete the circuit and light the lamp.

Question: In the context of household electricity usage, what is the key distinction between direct current from batteries and alternating current from wall sockets?
A. both are identical forms of electricity with different names
B. DC is stronger while AC is weaker for powering devices
C. DC from batteries powers small devices while AC from wall sockets can run larger appliances
D. AC is only used for heating and DC for lighting
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Answer: (C) DC from batteries powers small devices while AC from wall sockets can run larger appliances

Explanation:
The chapter states that 'Electricity from batteries usually powers small devices and is of a type called Direct Current (DC)' while 'electricity from power plants that come to the wall socket is known as Alternating Current (AC) and can run larger appliances.'

Question: Which observation from Activity 3.6 would best demonstrate why certain circuit arrangements cause the lamp to glow while others do not?
A. different wires conduct electricity better than others
B. the brightness depends on the color of the lamp bulb
C. only arrangements forming a complete conducting path between both cell terminals allow current flow through the lamp
D. the lamp's age affects its ability to light up
Show Answer & Explanation

Answer: (C) only arrangements forming a complete conducting path between both cell terminals allow current flow through the lamp

Explanation:
The lamps glowed only in specific arrangements (S.No. 1 and 6 in Table 3.1) where the cell terminals connected properly through wires to the lamp terminals, forming a complete circuit for current flow.

Question: What distinguishes the two wires of an LED beyond their functional purpose in the circuit?
A. they conduct electricity at different speeds
B. they are different materials entirely
C. one is longer (positive terminal) and one is shorter (negative terminal)
D. they glow different colors inside the LED
Show Answer & Explanation

Answer: (C) one is longer (positive terminal) and one is shorter (negative terminal)

Explanation:
Activity 3.5 notes: 'Notice the length of two wires attached to the LED. Do you find one of those longer than the other?' and explains that the longer wire is positive while the shorter is negative.

Question: If you observe a circuit diagram with a symbol showing a triangle pointing in one direction with two small arrows indicating light emission, what component does this represent?
A. an electric cell
B. an incandescent lamp
C. a light emitting diode with directional current flow
D. a switch in the closed position
Show Answer & Explanation

Answer: (C) a light emitting diode with directional current flow

Explanation:
The chapter specifies: 'In the symbol for an LED, the triangle points to the direction in which the current can flow. The two arrows indicate that an LED emits light.'

Question: If the filament inside an incandescent lamp has broken, why would the lamp no longer function in any circuit?
A. the glass bulb can no longer protect against air
B. a broken filament interrupts the current path, preventing any flow of electricity through the lamp
C. broken filaments emit toxic gases
D. the metal terminals become separated from the bulb
Show Answer & Explanation

Answer: (B) a broken filament interrupts the current path, preventing any flow of electricity through the lamp

Explanation:
The chapter's Fascinating Facts note: 'A broken filament stops the flow of current, preventing the lamp from glowing,' demonstrating that filament continuity is essential for circuit operation.

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Multiple Choice Questions (MCQs) for Class 7 Science Chapter 03 Electricity Circuits And Their Components

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