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Class 7 Science Chapter 3 Electricity Circuits and Their Components Worksheet
Class 7 Electricity Circuits and Their Components Worksheet
Worksheet On Electricity Circuits and Their Components Class 7 – Electricity Circuits and Their Components Worksheet Class 7
A. Objective Type Questions
Multiple Choice Questions
Question 1.
What does an open circuit indicate?
(a) The switch is ON and current is flowing through the circuit.
(b) The switch is OFF, and no current is flowing through the circuit.
(c) Switch is OFF and current is flowing through the circuit.
(d) None of the above
Answer:
(b) The switch is OFF, and no current is flowing through the circuit.
Question 2.
Three bulbs A, B, and C are connected in a circuit as shown below. When the switch is ‘ON’
(a) Bulb C will glow first
(b) Bulbs B and C will glow simultaneously, and bulb A will glow after some time
(c) All the bulbs A, B, and C will glow at the same time
(d) The bulbs will glow in the order A, B, and C
Answer:
(c) All the bulbs A, B, and C will glow at the same time
Question 3.
Which of the following is a good conductor of electricity?
(a) Human body
(b) Wooden stick
(c) Iron coin
(d) Air
Answer:
(c) Iron coin
Question 4.
A circuit diagram shows a cell, a bulb, and wires, but no switch. What will happen when this circuit is connected?
(a) The bulb will blink
(b) The bulb will not glow
(c) The bulb will glow continuously
(d) The cell will turn off
Answer:
(c) The bulb will glow continuously
Question 5.
A metal spoon is connected between two terminals of a battery with a bulb in the circuit. The bulb glows. What does this show?
(a) The spoon is hot
(b) The spoon is an insulator
(c) The spoon is a conductor
(d) The spoon stores charge
Answer:
(c) The spoon is a conductor
Question 6.
Identify the incorrect statement from the following.
(a) When a circuit is in the off position, no current flows through it.
(b) When an electric current flows through a wire, it behaves like a magnet.
(c) Incandescent electric bulbs are better electricity-efficient lighting sources.
(d) The positive terminal of one cell is always connected to the negative terminal of the next cell.
Answer:
(c) Incandescent electric bulbs are better electricity-efficient lighting sources.
Question 7.
Which of the following statements is true regarding the given circuit diagram?
(a) The compass needle is showing deflection.
(b) The electric bulb is glowing.
(c) The potential of the battery is decreasing.
(d) The circuit is open as the wire is broken.
Answer:
(c) The potential of the battery is decreasing.
Question 8.
A teacher demonstrates a working circuit using an LED. She reverses the connections, and the LED stops glowing. Why?
(a) LED works only with AC.
(b) The LED gets damaged easily.
(c) LED allows current in only one direction.
(d) LED consumes too much energy.
Answer:
(c) LED allows current in only one direction.
Question 9.
Which of the following is not needed for a torch to work?
(a) A bulb or LED
(b) A switch
(c) A fuse
(d) A battery
Answer:
(c) A fuse
Question 10.
A student connects an electric cell directly to a bulb using wires, but the bulb does not glow. Which of these is the most likely reason?
(a) The wires are too short.
(b) The cell is placed upside down.
(c) The circuit is not complete.
(d) The bulb is facing downward.
Answer:
(c) The circuit is not complete.
Question 11.
When you press the switch of a torch, the bulb glows. What does this action do inside the torch?
(a) Change the battery.
(b) Breaks the circuit.
(c) Completes the circuit and allows current to flow.
(d) Reduces the brightness of the bulb.
Answer:
(c) Completes the circuit and allows current to flow.
Question 12.
A student builds a circuit with a battery, switch, and a lamp. The lamp glows only when the switch is ON. What does this show about the role of the switch?
(a) It increases the power.
(b) It connects the cell and lamp permanently.
(c) It controls the flow of current by opening or closing the circuit.
(d) It makes the lamp brighter.
Answer:
(c) It controls the flow of current by opening or closing the circuit.
Question 13.
In a circuit diagram, the symbol “| |” represents which component?
(a) Electric bulb
(b) Battery (combination of cells)
(c) Switch
(d) Wire
Answer:
(b) Battery (combination of cells)
Question 14.
A student touches both terminals of a cell with her dry finger. What happens?
(a) She feels a shock.
(b) Current flows through her hand.
(c) No current flows.
(d) The cell gets damaged.
Answer:
(c) No current flows.
Question 15.
A circuit is shown with a lamp, a cell, a switch, and connecting wires. The bulb does not glow even when the switch is ON. What should the student check first?
(a) If the wires are colourful.
(b) If the cell is brand new.
(c) If the lamp is getting hot.
(d) If all connections are tight and complete.
Answer:
(d) If all connections are tight and complete.
Fill in the Blanks
Question 1.
Fill in the blanks by choosing the appropriate words given with each sentence.
(a) A continuous and closed path of electric current is called a _____________. [conductor/circuit/insulator]
(b) A device that is used to break or complete a circuit is called a _____________. [cell/lamp/switch]
(c) A bulb glows when current passes through its thin wire called _____________. [filament/fuse/coil]
(d) An _____________ [LED/fuse/switch] glows even with a small current and is used in decorative lights.
(e) The metal _____________ [aluminium/iron/copper] is used in electric wires because it is a good conductor.
Answer:
(a) circuit
(b) switch
(c) filament
(e) copper
(d) LED
Question 2.
Complete the statements by using suitable words.
(a) A device that opens or closes a circuit is called a _____________.
(b) In a circuit diagram, a battery is represented by a combination of _____________ and _____________ lines.
(c) When the switch is in the ‘off position, the electric circuit is said to be _____________.
(d) The material that allows electric current to pass through it is called a _____________.
(e) The _____________ is the part of a bulb that glows when electricity passes through it.
Answer:
(a) switch
(b) longer and shorter lines
(c) open
(d) conductor
(e) filament
True/False
Question 1.
Put a (✓) with green sketch pen against the statements that are correct and a (✗) with red sketch pen against incorrect statements.
(a) To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell.
(b) It is good to represent electric components by their symbols while making a circuit diagram.
(c) Electric current passing through any conductor produces light.
(d) Electric current can flow through insulators.
(e) A switch is used to open or close an electric circuit.
(f) In a closed circuit, the electric current flows from the negative terminal to the positive terminal of the battery.
(g) The filament in a bulb is usually made of copper.
Answer:
(a) False (✗)
(b) True (✓)
(c) False (✗)
(d) False (✗)
(e) True (✓)
(f) True (✓)
(g) False (✗)
Question 2.
Which of the following precautions are mentioned correctly that need to be taken while using electric gadgets / appliances/ circuits? Mark them with a red sketch pen.
(a) If the bulb in a torch does not glow, even with new batteries, the filament might be okay.
(b) When you switch ON a light and it glows instantly, it shows the circuit is closed and a filament is working.
(c) An electric cell has two terminals: one positive and one negative.
(d) Plastic and rubber are good conductors of electricity.
(e) A bulb will glow only when the circuit is closed.
Answer:
(a) False
(b) True
(c) True
(d) False
(e) True
Match the Following
Question 1.
Match the names of electrical components given in column I with their suitable symbols in column II.
(a) _____________
(b) _____________
(c) _____________
(d) _____________
(e) _____________
(f) _____________
(g) _____________
Answer:
(a) (vi)
(b) (iv)
(c) (i)
(d) (ii)
(e) (iii)
(f) (v)
(g) (vii)
Question 2.
Match the columns and choose the correct options given below.
Column I | Column II |
(a) Conductor | (i) Used to break or complete a circuit |
(b) Insulator | (ii) Material that allows an electric current to pass through |
(c) Switch | (iii) A device that lights up when electricity flows |
(d) Bulb | (iv) A source of electric current |
(e) Cell | (v) Material that does not allow electric current to pass through |
Answer:
Column I | Column II |
(a) Conductor | (ii) Material that allows an electric current to pass through |
(b) Insulator | (v) Material that does not allow electric current to pass through |
(c) Switch | (i) Used to break or complete a circuit |
(d) Bulb | (iii) A device that lights up when electricity flows |
(e) Cell | (iv) A source of electric current |
Question 3.
Match the columns and choose the correct options given below.
Column I | Column II |
(a) Electric circuit | (i) A diagram that uses symbols to show electrical components |
(b) Electric cell | (ii) Allows current to flow only in a complete path |
(c) Circuit diagram | (iii) Source of electricity in small devices |
(d) Battery | (iv) Combination of two or more cells |
(e) Open circuit | (v) A break in the path of an electric current |
Answer:
Column I | Column II |
(a) Electric circuit | (ii) Allows current to flow only in a complete path |
(b) Electric cell | (iii) Source of electricity in small devices |
(c) Circuit diagram | (i) A diagram that uses symbols to show electrical components |
(d) Battery | (iv) Combination of two or more cells |
(e) Open circuit | (v) A break in the path of an electric current |
Assertion-Reason Questions
The questions given below consist of an Assertion and a Reason. Based on that, choose the appropriate option.
(a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
(c) The assertion is true but the Reason is false.
(d) The assertion is false but the Reason is true.
Question 1.
Assertion: A bulb glows only when the circuit is closed.
Reason: A closed circuit allows electric current to flow through the bulb.
Answer:
(a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
Question 2.
Assertion: Plastic is a good conductor of electricity.
Reason: A Conductor allows the easy movement of electric charges.
Answer:
(d) The assertion is false but the Reason is true.
Question 3.
Assertion: A battery is made by combining multiple cells.
Reason: A single cell cannot provide enough voltage in some circuits.
Answer:
(a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
Question 4.
Assertion: A switch allows or stops the flow of electric current.
Reason: It acts as a conductor in an open circuit.
Answer:
(c) The assertion is true, but the Reason is false.
Question 5.
Assertion: An LED lights up only when electricity flows in one direction.
Reason: LED is a special type of device that allows electricity to pass only in one direction.
Answer:
(a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
Case-Based Questions
Raveena is trying to light a bulb using a simple circuit. She has a few cells, a switch, a bulb, and some wires. However, when she connects everything, the bulb does not light up. She then checked for the connections, and if they are properly tight, but the bulb still doesn’t glow.
Question 1.
What could be the possible reason(s) of not glowing up of bulb?
(i) The cells are not connected properly.
(ii) The switch is ON.
(iii) The bulb is fused.
(iv) The switch is OFF.
(a) (i) and (iii)
(b) (i), (iii), and (iv)
(c) Only (iii)
(d) All of these
Answer:
(b) (i), (iii), and (iv)
Question 2.
Raveena once studied that when the chemicals in the cells are almost used up, then very little current flows through the circuit, which doesn’t allow the electric bulb to glow. What other component in place of a bulb can she use to check whether her circuit is working or not?
(a) A magnetic compass
(b) LED bulb
(c) Steel wool
(d) Both (a) and (b)
Answer:
(b) LED bulb
Question 3.
What is the working principle of an electric bulb?
(a) Chemical effect of electric current
(b) Magnetic effect of electric current
(c) Heating effect of electric current
(d) Charging of an electric conductor
Answer:
(c) Heating effect of electric current
B. Subjective Type Questions
Define the following terms
Question 1.
Open circuit
_________________________________________________
Question 2.
Battery
_________________________________________________
Question 3.
Filament
_________________________________________________
Question 4.
Open circuit
_________________________________________________
Question 5.
Closed circuit
_________________________________________________
Question 6.
Cell
_________________________________________________
Very Short Answer Type Questions
Question 1.
Draw the circuit diagram to represent the circuit shown below.
_________________________________________________
Question 2.
Which part of the symbol of a battery shows positive and negative terminals?
_________________________________________________
Question 3.
Which terminal of a cell is the longer line in the circuit symbol?
_________________________________________________
Question 4.
Name the component that connects or disconnects a circuit.
_________________________________________________
Question 5.
What is the function of a battery in a circuit?
_________________________________________________
Question 6.
What happens when the terminals of a cell are connected directly with a wire?
_________________________________________________
Question 7.
Name the source of light in a torch.
_________________________________________________
Question 8.
What does a glowing bulb in a circuit indicate?
_________________________________________________
Question 9.
Draw the symbols of the following circuit components.
(a) Battery _________________________________________________
(b) Switch in off position _________________________________________________
Short Answer Type Questions
Question 1.
“Don’t experiment with the electric supply from mains”. Justify the given statement.
_________________________________________________
_________________________________________________
_________________________________________________
Question 2.
What happens if cells in a battery are connected in opposite direction?
_________________________________________________
_________________________________________________
_________________________________________________
Question 3.
What is the difference between a cell and a battery?
_________________________________________________
_________________________________________________
_________________________________________________
Question 4.
Why do we use circuit diagrams instead of drawing actual pictures?
_________________________________________________
_________________________________________________
_________________________________________________
Question 5.
Seema does not have a night lamp in her room. She covered the bulb of her room with a towel in the night to get dim light. Has she taken the right step? Give one reason to justify your answer.
_________________________________________________
_________________________________________________
_________________________________________________
Question 6.
Why do we cover plug pin holes within the reach of children with cellotape or a plastic cover when not in use?
_________________________________________________
_________________________________________________
_________________________________________________
Long Answer Type Questions
Question 1.
Salma made an electric circuit using a cell holder (as shown in the figure), a switch, and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Salma identify the possible defects in the circuit.
_________________________________________________
_________________________________________________
_________________________________________________
Question 2.
The following figure shows four cells fixed on a board. Draw lines to indicate how you will connect their terminals with wires to make a battery of four cells.
_________________________________________________
_________________________________________________
_________________________________________________
Question 3.
Draw in your notebook the symbols to represent the following components of electrical circuits: connecting wires, switch in the ‘OFF’ position, bulb, cell, switch in the ‘ON’ position, and battery.
_________________________________________________
_________________________________________________
_________________________________________________
Question 4.
In the circuit shown in the figure below.
(a) Would any of the bulbs glow when the switch is in the ‘OFF’ position?
(b) What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?
_________________________________________________
_________________________________________________
_________________________________________________
Question 5.
Draw the circuit diagram to represent the circuit shown below.
_________________________________________________
_________________________________________________
Skill-Based Activities
Question 1.
Circle or name the item that does not belong in the group
(a) Copper, Aluminium, Plastic, Iron _____________
(b) Switch, Battery, Circuit, Wood _____________
(c) Torch, Cell, Bulb, Eraser _____________
(d) Closed circuit, Bulb, LED, Insulator _____________
(e) Rubber, Glass, Wood, Steel _____________
Question 2.
Complete the crossword puzzle with the help of the clues given below.
Across
1. A coil that behaves as a magnet when current is supplied to it.
5. When the filament of a bulb is broken, the bulb is called _____________
3. It is convenient to represent an electric component by _____________
Down
2. When an electric current flows through a wire, the wire gets _____________
4. This is the combination of two or more cells.
Question 3.
Solve the riddle by identifying A, B, and C:
A: I allow electric current to pass through me easily.
B: I do not let electric current pass through me.
C: I light up when current flows through my filament.
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