Electricity and Circuits Worksheet

Objective Type Questions

1. Match the following circuit components with their functions:
   
   
2. State whether the statement is true or false:
   A plastic or rubber cover on the handle of an electrician's tool is only for better grip.
3. Find the odd one out.
   Iron nail, Matchstick, Eraser, rubber gloves.
4. State whether the statement is true or false:
   The two terminals of the electric cell should never be connected without a switch and a device such as a bulb.
5. Crossword puzzle
   
   
   
   Across
   1. A device used to control the flow of electric current in a circuit.
   2. A material that allows electric current to pass through it easily.
   
   Down:
   1. Thin, flexible metal strands connect components in an electric circuit.
   2. A material that does not allow the electric current to pass through it easily.
   3. A device that converts electrical energy into light energy.
   4. The flow of electric charge through a conductor.
   
   
   Multiple Choice Questions
   
   
6. Refer to the image of an electric cell.
   
   And choose which option describes its structure accurately.
   (a) Both sides have negative signs and a metal cap.
   (b) Both ends have positive signs, with a metal cap on top and a metal disc on the bottom.
   (c) The top has a positive sign, and the bottom has a negative one with metal discs on both ends.
   (d) The top has a positive sign with a metal cap, and the bottom has a negative one with a metal disc.
7. The below image shows two states of an electric circuit.
   
   
   Which of the following options explains the necessary condition to ensure current flow through the bulb?
   (a) A key must be present in the circuit.
   (b) The circuit must be complete.
   (c) Wires of different thicknesses must not be used.
   (d) The cell must have positive and negative signs.
8. The below figure shows two circuits A and B, connecting a bulb, battery and key.
   
   Based on the given image, choose the correct option among the following.
   (a) Circuit A → Complete; Circuit B → Incomplete
   (b) Circuit A → Incomplete; Circuit B → Incomplete
   (c) Circuit A → Complete; Circuit B → Complete
   (d) Circuit A → Incomplete; Circuit B → Complete
9. Prachi connects the open ends of an electric circuit to the opposite end of the safety pin, as shown in the figure below. She observes that the light bulb starts glowing.
   
   
   What other material would help the bulb glow if replaced with the safety pin?
   (a) Glass rod
   (b) Wool thread
   (c) Iron nail
   (d) Wooden stick
10. Which of the following is why copper and aluminium are used for making wires in domestic and industrial settings?
    (a) They are good insulators
    (b) They are abundant in nature
    (c) They are easy to work with
    (d) They are good conductors of electricity
    
    
    SAQ's
    
    
11. The diagram below illustrates the two circuit states when the switch is open and closed, respectively, explain how the switch's position impacts the electricity flow in the circuit provided?
    
    
12. How can Preeti use her electric switch model to demonstrate the concept of open and closed circuits in a science exhibition?
13. Aman is comparing the conductivity of different materials commonly found in households, such as paper, glass, copper wire and metal pipe. Based on his observations, classify these materials as conductors or insulators and explain the reasons behind their classification.
14. Rajiv saw the circuit below and concluded it was a complete circuit. Do you agree with his conclusion? Justify your answer.
    
    
15. Ravi is curious about how an electric cell works. Explain the structure of an electric cell and how it generates electric current.
    
    
    Assertion-Reasoning Questions
    
    Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
    
    
    
16. Assertion:Metals like copper and aluminium are used for making wires because they are easily available.
    Reason:Conductors are material which does not allow the electric current to pass through them.
17. Assertion:A simple working model of an electric switch can be made using a metallic paperclip and a piece of cardboard.
    Reason:The metallic paperclip can act as a movable contact, while the cardboard can serve as a stationary contact, allowing for the opening and closing of the circuit.
18. Assertion:Using insulators wrapped around the conductor in electrical wiring helps ensure safety.
    Reason:Conductors prevent electricity from flowing through them easily, while insulators allow electricity to flow through them easily.
19. Assertion:The battery in a circuit provides the energy needed to make the electric current flow.
    Reason:The battery converts chemical energy into electrical energy, providing the energy needed to flow electric current.
    
    Case-Based Questions
    
    
20. Rohit and Priya are two curious kids learning about electricity in their science class. Their teacher has given them a task to test different items in their classroom to classify them as conductors or insulators. As shown below, they have been provided with a list of items and a circuit connection to test the material's properties.
    
    
    The below table shows the record of their observations.
    
    i. How can Rohit and Priya use the given circuit connection to test the properties of the materials on their list?
    ii. Based on their observations, which materials did Rohit and Priya classify as conductors? Explain why?
    iii. Based on their observations, which materials did Rohit and Priya classify as insulators? Explain why?
    iv. How can Rohit and Priya use their observations to understand the role of conductors and insulators in day-to-day life? Complete the given table based on the given information.

Objective Type Questions

1. Match the following circuit components with their functions:
   
   
   
   Solution:
   
2. State whether the statement is true or false:
   A plastic or rubber cover on the handle of an electrician's tool is only for better grip.
   Correct answer: False
   Solution:
   A plastic or rubber cover on the handle of an electrician’s tool provides a better grip and insulates the user from electric shock.
3. Find the odd one out.
   Iron nail, Matchstick, Eraser, rubber gloves.
   Correct answer: Iron nail
   Solution:
   Among the following only iron nail is a conductor, whereas the rest are insulators.
4. State whether the statement is true or false:
   The two terminals of the electric cell should never be connected without a switch and a device such as a bulb.
   Correct answer: True
   Solution:
   If we connect two terminals without the switch, the chemicals in the electric cell get used up very fast, and the cell will stop working.
5. Crossword puzzle
   
   
   
   
   Across
   1. A device used to control the flow of electric current in a circuit.
   2. A material that allows electric current to pass through it easily.
   
   Down:
   1. Thin, flexible metal strands connect components in an electric circuit.
   2. A material that does not allow the electric current to pass through it easily.
   3. A device that converts electrical energy into light energy.
   4. The flow of electric charge through a conductor.
   Solution:
   
   
   Multiple Choice Questions
   
   
6. Refer to the image of an electric cell.
   
   And choose which option describes its structure accurately.
   (a) Both sides have negative signs and a metal cap.
   (b) Both ends have positive signs, with a metal cap on top and a metal disc on the bottom.
   (c) The top has a positive sign, and the bottom has a negative one with metal discs on both ends.
   (d) The top has a positive sign with a metal cap, and the bottom has a negative one with a metal disc.
   Correct option: (b) The circuit must be complete.
   Solution:
   Electric circuits must be complete for current to flow through the bulb. This means there must be a direct path connecting the positive terminal of the cell with the bulb before returning to the cell's negative terminal.
7. The below image shows two states of an electric circuit.
   
   
   Which of the following options explains the necessary condition to ensure current flow through the bulb?
   (a) A key must be present in the circuit.
   (b) The circuit must be complete.
   (c) Wires of different thicknesses must not be used.
   (d) The cell must have positive and negative signs.
   Correct option: (d) Circuit A → Incomplete; Circuit B → Complete
   Solution:
   The given figure shows that the circuit A key is open, which means it will be incomplete, and the circuit B key is closed. Thus the circuit will be complete.
8. The below figure shows two circuits A and B, connecting a bulb, battery and key.
   
   Based on the given image, choose the correct option among the following.
   (a) Circuit A → Complete; Circuit B → Incomplete
   (b) Circuit A → Incomplete; Circuit B → Incomplete
   (c) Circuit A → Complete; Circuit B → Complete
   (d) Circuit A → Incomplete; Circuit B → Complete
   Correct option: (d) Circuit A → Incomplete; Circuit B → Complete
   Solution: The given figure shows that the circuit A key is open, which means it will be incomplete, and the circuit B key is closed. Thus the circuit will be complete.
9. Prachi connects the open ends of an electric circuit to the opposite end of the safety pin, as shown in the figure below. She observes that the light bulb starts glowing.
   
   
   What other material would help the bulb glow if replaced with the safety pin?
   (a) Glass rod
   (b) Wool thread
   (c) Iron nail
   (d) Wooden stick
   Correct option: (c) Iron nail
   Solution:
   Only a iron nail will act as a conductor and complete the circuit in the given material, just like the safety pin used in the previous case.
10. Which of the following is why copper and aluminium are used for making wires in domestic and industrial settings?
    (a) They are good insulators
    (b) They are abundant in nature
    (c) They are easy to work with
    (d) They are good conductors of electricity
    Correct option: (d) They are good conductors of electricity.
    Solution:
    Copper and aluminium are commonly used for making wires in domestic and industrial settings because they are good conductors of electricity. This means they allow the electric current to flow through them easily, making them ideal for use in electrical wiring.

    
    SAQ's

    
    
11. The diagram below illustrates the two circuit states when the switch is open and closed, respectively, explain how the switch's position impacts the electricity flow in the circuit provided?
    
    
    Solution:
    Switch position affects the flow of electric current in a circuit, allowing or preventing the flow of electric charge.
12. How can Preeti use her electric switch model to demonstrate the concept of open and closed circuits in a science exhibition?
    Solution:
    Preeti can use her electric switch model to demonstrate the concept of open and closed circuits. She can show how opening and closing the switch affects the flow of electricity in the circuit.
13. Aman is comparing the conductivity of different materials commonly found in households, such as paper, glass, copper wire and metal pipe. Based on his observations, classify these materials as conductors or insulators and explain the reasons behind their classification.
    Solution:
    Based on Aman's observations, copper wire and metal pipe are classified as conductors because they allow the electric current to pass through them due to the presence of free electrons, while paper and glass are classified as insulators because they do not allow electric current to pass through them.
    
    
14. Rajiv saw the circuit below and concluded it was a complete circuit. Do you agree with his conclusion? Justify your answer.
    
    
    Solution:
    No, from the given figure, we can see that the circuit is incomplete, and hence it is an open or incomplete circuit, which can be confirmed since the bulb is not glowing.
15. Ravi is curious about how an electric cell works. Explain the structure of an electric cell and how it generates electric current.
    Solution:
    An electric cell consists of a metal cap, which is the positive terminal, and a metal disc, which is the negative terminal.
    
    All electric cells have these two terminals. The electric cell generates electricity through chemical reactions that occur within it, utilizing the chemicals stored inside. However, once the chemicals are depleted, the electric cell ceases to produce electricity and needs to be replaced with a new one.
    
    
    Assertion-Reasoning Questions
    
    Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
    
    
    
16. Assertion:Metals like copper and aluminium are used for making wires because they are easily available.
    Reason:Conductors are material which does not allow the electric current to pass through them.
    Correct option: (c) A is true, but R is false.
    Conductors are materials that allow the electric current to pass through them easily. Copper and aluminium are both good conductors of electricity, which is one of the reasons why they are used for making wires.
17. Assertion:A simple working model of an electric switch can be made using a metallic paperclip and a piece of cardboard.
    Reason:The metallic paperclip can act as a movable contact, while the cardboard can serve as a stationary contact, allowing for the opening and closing of the circuit.
    Correct option: (a) Both A and R are true, and R is the correct explanation of the assertion.
    The assertion is true because a metallic paperclip can be moved to complete or break contact with a stationary cardboard, as a result we will get open or closed circuit respectively.
18. Assertion:Using insulators wrapped around the conductor in electrical wiring helps ensure safety.
    Reason:Conductors prevent electricity from flowing through them easily, while insulators allow electricity to flow through them easily.
    Correct option: (d) A is true, but R is false.
    The assertion is correct because insulators wrapped around conductors in electrical wiring help to ensure safety. However, the reason given is incorrect. Conductors allow electricity to flow easily, whereas insulators prevent it from flowing easily. The flow of electricity can be controlled to prevent electrical hazards by wrapping insulators around conductors in electrical wiring.
19. Assertion:The battery in a circuit provides the energy needed to make the electric current flow.
    Reason:The battery converts chemical energy into electrical energy, providing the energy needed to flow electric current.
    Correct option: (a) Both A and R are true, and R is the correct explanation of the assertion.
    The assertion is true because a circuit's battery provides the energy needed to make the electric current flow. The reason given is also true and is the correct explanation of the assertion. The battery converts chemical energy into electrical energy, providing the energy needed to flow the electric current.
    
    Case-Based Questions
    
    
20. Rohit and Priya are two curious kids learning about electricity in their science class. Their teacher has given them a task to test different items in their classroom to classify them as conductors or insulators. As shown below, they have been provided with a list of items and a circuit connection to test the material's properties.
    
    
    The below table shows the record of their observations.
    
    i. How can Rohit and Priya use the given circuit connection to test the properties of the materials on their list?
    ii. Based on their observations, which materials did Rohit and Priya classify as conductors? Explain why?
    iii. Based on their observations, which materials did Rohit and Priya classify as insulators? Explain why?
    iv. How can Rohit and Priya use their observations to understand the role of conductors and insulators in day-to-day life? Complete the given table based on the given information.
    Solution:
    i. Rohit and Priya used the circuit connection to test the properties of the materials on their list by replacing the safety pin with each material and observing whether the bulb glowed or not.
    ii. Based on their observations, Rohit and Priya classified the metal spoon and paper clip as conductors because the bulb glowed when these materials were used in place of the safety pin in the circuit connection.
    iii. Based on their observations, Rohit and Priya classified the wooden stick and rubber band as insulators because the bulb did not glow when these materials were used in place of the safety pin in the circuit connection.
    iv. Rohit and Priya can use their observations to understand that conductors allow the electric current to flow through them easily while insulators do not, and this property plays an important role in controlling the flow of electricity in day-to-day life.