CBSE Class 7 Science Chapter 03 Electricity Circuits And Their Components MCQs Set 01

Science Objective Questions and Answers: Chapter 03 Electricity Circuits And Their Components

Review structured MCQ sets for Class 7 Science Chapter 03 Electricity Circuits And Their Components. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.

Download Chapter 03 Electricity Circuits And Their Components MCQs with Answers

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Question: At the Bhakra Nangal Dam, Nihal and his classmates were shown how electricity is generated using which natural resource?
A. wind energy
B. falling water
C. solar energy
D. natural gas
Show Answer & Explanation

Answer: (B) falling water

Explanation:
The chapter explicitly states that at the hydroelectric power house, the force of falling water was used to generate electricity.

Question: Which of the following is NOT mentioned as an electrical use in the initial categorisation made by Nihal's group?
A. powering a refrigerator
B. running a mixer grinder
C. charging a battery
D. lighting a street
Show Answer & Explanation

Answer: (C) charging a battery

Explanation:
The chapter lists various uses of electricity under different categories such as heating and cooling (refrigerator), cooking (mixer grinder), and lighting (street), but charging a battery is not explicitly mentioned in their initial lists.

Question: In an electric cell, which terminal is represented by the small protruding metal cap?
A. negative terminal
B. positive terminal
C. neutral terminal
D. ground terminal
Show Answer & Explanation

Answer: (B) positive terminal

Explanation:
The chapter clearly states that the metal cap on one side of the electric cell is the positive terminal, while the flat metal disc on the other side is the negative terminal.

Question: When two cells are connected to form a battery, how must their terminals be arranged?
A. positive to positive and negative to negative
B. positive of one cell to negative of the next cell
C. both cells facing the same direction
D. terminals do not need to be connected in any particular order
Show Answer & Explanation

Answer: (B) positive of one cell to negative of the next cell

Explanation:
Activity 3.3 demonstrates that the lamp glows when cells are placed such that the positive terminal of one cell is connected to the negative terminal of the next cell. This specific arrangement allows the battery to function properly.

Question: In an incandescent lamp, which part of the lamp glows when electric current passes through it?
A. the glass bulb
B. the metal case
C. the filament
D. the thick wires
Show Answer & Explanation

Answer: (C) the filament

Explanation:
The chapter describes that the thin wire inside the glass bulb, called the filament, gets hot and glows to produce light when current flows through it.

Question: How do LEDs differ from incandescent lamps in their structure?
A. LEDs have a thicker filament
B. LEDs do not have filaments
C. LEDs have a larger glass bulb
D. LEDs require more electrical energy
Show Answer & Explanation

Answer: (B) LEDs do not have filaments

Explanation:
Activity 3.5 observes that unlike incandescent lamps, LEDs do not have filaments inside them. Instead, they consist of two terminals with different wire lengths—a longer positive wire and a shorter negative wire.

Question: For an LED to glow, which terminal of the LED must connect to which terminal of the battery?
A. shorter wire to positive terminal of battery
B. longer wire to negative terminal of battery
C. longer wire to positive terminal and shorter wire to negative terminal
D. either wire can connect to either terminal
Show Answer & Explanation

Answer: (C) longer wire to positive terminal and shorter wire to negative terminal

Explanation:
• Current passes through LED in one direction only
• Longer wire is the positive terminal of the LED
• Shorter wire is the negative terminal of the LED
• Activity 3.7 demonstrates that LED glows only when positive terminal (longer wire) connects to positive battery terminal and negative terminal (shorter wire) connects to negative battery terminal

Question: What forms when one terminal of a lamp is connected to one terminal of a cell and the other lamp terminal to the other cell terminal?
A. a battery
B. an electrical circuit
C. a switch
D. a conductor
Show Answer & Explanation

Answer: (B) an electrical circuit

Explanation:
An electrical circuit is formed when the lamp terminals are connected to the cell terminals by wires, providing a complete path for electric current to flow.

Question: In Activity 3.8, a simple switch was constructed using which materials?
A. cardboard, metal wires, and wooden pins
B. cardboard, drawing pins, a safety pin, and metal wires
C. plastic board, springs, and metal clips
D. rubber mat, copper coils, and aluminum foil
Show Answer & Explanation

Answer: (B) cardboard, drawing pins, a safety pin, and metal wires

Explanation:
The activity specifies collecting two drawing pins, a safety pin (or paper clip), two wires, and a small piece of cardboard to construct a functional switch.

Question: When a switch is in the 'ON' position, what happens to the circuit?
A. the circuit remains broken and no current flows
B. the circuit becomes closed and current flows from positive to negative terminal
C. the switch disconnects from the circuit entirely
D. the current changes direction
Show Answer & Explanation

Answer: (B) the circuit becomes closed and current flows from positive to negative terminal

Explanation:
Activity 3.9 shows that in the ON position, the safety pin touches both drawing pins, closing the gap and completing the path, allowing current to flow from the cell's positive to negative terminal, making the lamp glow.

Question: What do the long and short lines represent in the symbol for an electric cell in circuit diagrams?
A. long line is negative, short line is positive
B. long line is positive, short line is negative
C. long line is a wire, short line is the terminal
D. both lines represent terminals but have no polarity
Show Answer & Explanation

Answer: (B) long line is positive, short line is negative

Explanation:
Section 3.3 explains that in the cell symbol, the long line represents the positive terminal while the short line represents the negative terminal.

Question: Why are electric wires covered with plastic or rubber materials?
A. to make them more flexible
B. to increase their conductivity
C. because plastic and rubber are insulators that protect people from electric shocks
D. to reduce the cost of wires
Show Answer & Explanation

Answer: (C) because plastic and rubber are insulators that protect people from electric shocks

Explanation:
The chapter explains that insulators like rubber, plastics, and ceramics are used to cover wires, plug tops, and switches to protect people from electric shocks. Wires themselves are made of conductors, but the insulating covering prevents accidental contact with the conducting material.

Question: Which of the following materials would allow electric current to pass through it easily?
A. rubber eraser
B. wooden stick
C. glass bangle
D. copper key
Show Answer & Explanation

Answer: (D) copper key

Explanation:
Based on Activity 3.11 and Table 3.3, metals are good conductors of electricity. Copper is a metal, so a copper key would allow current to flow easily. Rubber, wood, and glass are insulators.

Question: What is the main reason copper is used for making electrical wires instead of silver or gold, even though both are better conductors?
A. copper conducts electricity better than other metals
B. copper is easier to shape into wires
C. copper has comparatively lower cost and abundant supply
D. copper does not need insulation
Show Answer & Explanation

Answer: (C) copper has comparatively lower cost and abundant supply

Explanation:
The Dive Deeper section states that while silver, copper, and gold are the best electrical conductors, mainly copper is used for making electrical wires due to its comparatively lower cost and abundant supply.

Question: What safety caution is emphasized regarding electricity and the human body?
A. the body is an insulator so electricity cannot harm it
B. the body is a conductor and electric current can cause severe injury or death
C. electricity only harms wet skin, not dry skin
D. touching electrical devices with wet hands is safe if done quickly
Show Answer & Explanation

Answer: (B) the body is a conductor and electric current can cause severe injury or death

Explanation:
The caution section clearly states that the human body is a conductor of electricity, and electric current passing through the body may cause severe injury or even death, which is why people should never touch switches or plugs with wet hands.

Question: When Nihal's group created categories for the uses of electricity, under which heading would a microwave oven most appropriately fit?
A. Entertainment
B. Heating and Cooling
C. Cooking
D. Others
Show Answer & Explanation

Answer: (C) Cooking

Explanation:
The chapter lists microwave as one of the cooking appliances under the 'Cooking' category, along with electric kettles, mixer grinders, toasters, and ovens.

Question: In Activity 3.6, when attempting to make a lamp glow using a cell, why was it necessary to remove about 1 cm of plastic covering from the wire ends?
A. To make the wires easier to bend and shape
B. To expose the metal underneath so electric current could flow through the circuit
C. To prevent the wires from becoming too hot
D. To allow the cell to cool down faster
Show Answer & Explanation

Answer: (B) To expose the metal underneath so electric current could flow through the circuit

Explanation:
Plastic is an insulator, so removing the plastic coating exposes the metal conductor underneath, which allows electric current to pass through and complete the circuit needed to make the lamp glow.

Question: In the conduction tester experiment (Activity 3.11), what conclusion would you reach if the lamp glowed when the wire ends touched a metal spoon but did not glow when they touched a rubber eraser?
A. Both materials are equally good at allowing current to flow
B. The metal spoon is a conductor while the rubber eraser is an insulator
C. The rubber eraser is a better conductor than the metal spoon
D. The lamp's filament is damaged
Show Answer & Explanation

Answer: (B) The metal spoon is a conductor while the rubber eraser is an insulator

Explanation:
The lamp glowing indicates current passed through the spoon, making it a conductor. The lamp not glowing when touching the eraser means current cannot pass through rubber, making it an insulator. This demonstrates the difference between good conductors and poor conductors.

Question: In battery compartments where cells are placed side by side, how are their terminals typically connected?
A. The positive terminals of all cells are connected together
B. A thick wire or metal strip connects the positive terminal of one cell to the negative terminal of the next
C. The negative terminals face outward while positive terminals face inward
D. The cells are insulated from each other with plastic separators
Show Answer & Explanation

Answer: (B) A thick wire or metal strip connects the positive terminal of one cell to the negative terminal of the next

Explanation:
The 'Dive Deeper' section explains that in side-by-side cell arrangements, a thick wire or metal strip connects the positive terminal of one cell to the negative terminal of the next cell, and symbols are printed to help with proper placement.

Question: When observing a circuit diagram symbol for an LED, what does the triangle pointing in a specific direction indicate?
A. The direction in which the current can flow through the LED
B. Whether the LED is made of plastic or glass
C. How bright the LED will glow
D. The size of the LED's terminals
Show Answer & Explanation

Answer: (A) The direction in which the current can flow through the LED

Explanation:
The chapter states that in the LED symbol, the triangle points in the direction in which current can flow, and the two arrows indicate that the LED emits light. This directionality is crucial because LEDs only function when connected with correct polarity.

Question: Both conductors and insulators are important in electrical systems. Which of the following correctly pairs each material type with its appropriate use?
A. Conductors form the outer layer of wires; insulators form the inner metal core
B. Conductors are used for wires and switches; insulators cover wires and protect people from shocks
C. Insulators carry electricity through buildings; conductors prevent accidental contact
D. Conductors are only used in batteries; insulators are only used in lamps
Show Answer & Explanation

Answer: (B) Conductors are used for wires and switches; insulators cover wires and protect people from shocks

Explanation:
• Electrical wires, switches, and connectors are made of conductors to allow current flow
• Insulators like rubber, plastic, and ceramics cover wires and are used on plugs and switches
• This combination allows safe use of electricity by containing current in conductors while protecting people through insulating materials.

Question: When an incandescent lamp in a torchlight suddenly stops glowing even though the battery and switch appear to be working, what term describes this condition and what causes it?
A. Fused circuit, caused by too much current in the wires
B. Fused lamp, usually caused by a broken filament that stops current flow
C. Burned insulation, caused by overheating of the plastic covering
D. Dead battery, caused by loss of energy in the cell terminals
Show Answer & Explanation

Answer: (B) Fused lamp, usually caused by a broken filament that stops current flow

Explanation:
The 'Fascinating Facts' section explains that when an incandescent lamp does not glow despite being connected to a cell, it has 'fused' usually due to a broken filament. A broken filament stops the flow of current and prevents the lamp from glowing.

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