Class 6 Science Chapter 9 Case Based Questions - Electricity and Circuits

Case 1: Electric Cell

You are conducting a science experiment in your classroom to demonstrate the concept of an electric cell. You have an electric cell, and you want to explain its components and how it works.

Q1: What is the function of the positive and negative terminals of an electric cell?
Ans: The positive terminal of an electric cell is where electric current leaves the cell, and the negative terminal is where electric current enters the cell.

Q2: How does an electric cell produce electricity for devices like torches and toys?
Ans: An electric cell produces electricity by converting chemical energy into electrical energy through chemical reactions that take place within the cell. When connected to a device, it supplies electrical energy to make the device work.

Q3: What is the purpose of the dark powdery stuff inside an electric cell?
(a) To provide light
(b) To generate electricity
(c) To cool the cell
(d) To make the cell heavy
Ans: (b)

Q4: Which gas is commonly used to fill the inside portion of a bulb?
(a) Oxygen
(b) Argon
(c) Hydrogen
(d) Carbon dioxide
Ans: (b)

Case 2: Electric Circuit

You are teaching a group of students about electric circuits and how they work. You want to test their understanding of the concept.

Q5: Define an electric circuit and explain its purpose.
Ans: An electric circuit is a closed path through which electric current flows. It is used to provide a complete path for the flow of electricity, allowing devices to work.

Q6: What happens if the filament in a bulb is broken in an electric circuit?
Ans: If the filament in a bulb is broken in an electric circuit, the bulb does not glow because the flow of electricity through the filament is interrupted.

Q7: In which direction does electric current flow in an electric circuit?
(a) From negative to positive
(b) From positive to negative
(c) In a random direction
(d) It does not flow in a circuit
Ans: (b)

Q8: When the wires from a bulb are connected to the same terminal of an electric cell, what happens?
(a) The bulb glows brightly
(b) The bulb glows dimly
(c) The bulb does not glow
(d) The bulb flashes on and off
Ans: (c)

Case 3: Electric Switch

You are demonstrating the use of electric switches in a classroom. You want to assess your students' knowledge of electric switches.

Q9: Explain the purpose of an electric switch in an electrical circuit.
Ans: An electric switch is a device used to control the flow of electricity in an electrical circuit. It can either complete the circuit (closed switch) or break the circuit (open switch).

Q10: Differentiate between a closed switch and an open switch.
Ans: A closed switch allows the flow of electric current in the circuit, while an open switch interrupts the flow of electric current.

Q11: Which type of electric switch is commonly used in household lighting?
(a) Toggle switch
(b) Push-button switch
(c) Joystick switch
(d) None of the above
Ans: (a)

Q12: When an electric switch completes the circuit, it is called a:
(a) Closed switch
(b) Open switch
(c) Short circuit
(d) Circuit breaker
Ans: (a)

Case 4: Electric Conductors and Insulators

You are explaining the concept of electric conductors and insulators to your students. You want to evaluate their understanding of these materials.

Q13: Define electric conductors and provide an example.
Ans: Electric conductors are materials that allow electric current to pass through them easily. An example of an electric conductor is copper.

Q14: What is the purpose of using insulators in electrical appliances?
Ans: Insulators are materials that do not allow electric current to pass through them. They are used in electrical appliances to prevent the flow of electricity. For example, plastic is used to cover plugs and switches.

Q15: Which of the following materials is a good conductor of electricity?
(a) Glass
(b) Wood
(c) Copper
(d) Plastic
Ans: (c)

Q16: What happens when our bodies come into contact with electricity?
(a) They become insulators
(b) They conduct electricity
(c) They become magnetic
(d) They emit light
Ans: (b)