CBSE Class 7 Science Electricity: Circuits and Their Components (Class 7 NCERT New) Quiz 7

1. What is the purpose of a resistor?

A allow current flow B control current flow C prevent current flow D allow heat to build up

2. Which of the following is an INCORRECT statement regarding an electric switch?

A A switch is the source of electric current in a circuit. B A switch helps to complete or break the circuit. C A switch helps us to use electricity as per our requirement. D When the switch is in 'OFF' position, there is an air gap between its terminals.

3. A student forgot to remove the plastic insulator covering from the tips of the connecting wires while making a circuit. If the lamp and the cell are working properly, will the lamp glow?

A Yes, because plastic is a conductor. B No, because the insulator prevents the flow of current. C Yes, because the cell provides enough power to push through plastic. D No, because the lamp is not connected to a switch.

4. How should cells be connected to form a working battery?

A Positive terminal of one cell to positive terminal of the next. B Negative terminal of one cell to negative terminal of the next. C Positive terminal of one cell to negative terminal of the next. D It does not matter how the terminals are connected.

5. What is the primary reason why copper is commonly used for making electrical wires?

A It is the best conductor known to man. B It is an excellent insulator. C It is a good conductor with a comparatively lower cost and abundant supply. D It is the only metal that can be drawn into wires.

6. In a circuit diagram, what does the long line in the symbol for an electric cell represent?

A The negative terminal B The positive terminal C The switch D The filament

7. Which type of lamp has two terminals where one is attached to a longer wire (positive) and the other to a shorter wire (negative)?

A Incandescent lamp B Fluorescent tube C Light Emitting Diode (LED) D Neon lamp

8. What happens in a circuit when the switch is in the 'OFF' position?

A The circuit is closed and current flows. B The circuit is open and current flows. C The circuit is open and current does not flow. D The battery starts charging.

9. Which of the following materials is a conductor of electricity?

A Eraser (Rubber) B Scale (Plastic) C Key (Metal) D Stick (Wood)

10. What is a circuit diagram?

A A photograph of a circuit. B A representation of an electrical circuit using symbols. C A list of all materials needed for a circuit. D A map showing the location of power plants.