NCERT Class 7 Science MCQ | Chapter 3: Electricity: Circuits and their Components
1. What is an electric circuit?
(A) A path through which electric current can flow
(B) A device used to measure temperature
(C) A material that produces light
(D) A container used to store water
Answer: (A) A path through which electric current can flow
2. Which of the following is a source of electrical energy?
(A) Electric cell
(B) Switch
(C) Bulb
(D) Connecting wire
Answer: (A) Electric cell
3. Which component is used to produce light in a simple electric circuit?
(A) Electric bulb
(B) Switch
(C) Connecting wire
(D) Cell holder
Answer: (A) Electric bulb
4. What is the function of a switch in an electric circuit?
(A) To open or close the circuit
(B) To produce electricity
(C) To increase the length of the wire
(D) To produce light
Answer: (A) To open or close the circuit
5. When a switch is in the ON position, the circuit is generally:
(A) Open
(B) Closed
(C) Broken
(D) Disconnected
Answer: (B) Closed
6. When a switch is in the OFF position, the circuit is generally:
(A) Closed
(B) Complete
(C) Open
(D) Conducting
Answer: (C) Open
7. Which of the following materials is a good conductor of electricity?
(A) Copper
(B) Rubber
(C) Plastic
(D) Wood
Answer: (A) Copper
8. Which of the following is generally an insulator?
(A) Copper
(B) Aluminium
(C) Rubber
(D) Iron
Answer: (C) Rubber
9. Why are electric wires commonly made using metals such as copper?
(A) Copper is a good conductor of electricity
(B) Copper is always transparent
(C) Copper cannot carry electric current
(D) Copper is a good insulator
Answer: (A) Copper is a good conductor of electricity
10. What happens when the circuit is complete?
(A) Electric current can flow through the circuit
(B) Electric current cannot flow
(C) The wires disappear
(D) The cell stops existing
Answer: (A) Electric current can flow through the circuit
11. What happens when there is a break in an electric circuit?
(A) Current can flow normally
(B) Current cannot flow through the broken path
(C) The bulb becomes brighter
(D) The cell produces more energy
Answer: (B) Current cannot flow through the broken path
12. Which of the following is necessary for a simple electric circuit to operate a bulb?
(A) Cell, bulb, connecting wires and a closed circuit
(B) Only a bulb
(C) Only connecting wires
(D) Only a switch
Answer: (A) Cell, bulb, connecting wires and a closed circuit
13. What is the purpose of connecting wires in an electric circuit?
(A) To provide a conducting path for electric current
(B) To stop all electric current
(C) To produce sunlight
(D) To measure temperature
Answer: (A) To provide a conducting path for electric current
14. Which symbol is commonly used to represent an electric cell in a circuit diagram?
(A) Two parallel lines of unequal lengths
(B) A circle with a cross
(C) A triangle
(D) A square with no markings
Answer: (A) Two parallel lines of unequal lengths
15. Which symbol is commonly used to represent an electric bulb in a circuit diagram?
(A) A circle with a cross inside
(B) Two unequal parallel lines
(C) A straight line only
(D) A triangle
Answer: (A) A circle with a cross inside
16. Why are circuit diagrams useful?
(A) They provide a simple representation of an electric circuit
(B) They increase the voltage of a cell
(C) They make wires conduct better
(D) They produce electricity
Answer: (A) They provide a simple representation of an electric circuit
17. What is a conductor?
(A) A material that allows electric current to pass through it easily
(B) A material that completely blocks electric current
(C) A device used to produce heat
(D) A material that produces electricity by itself
Answer: (A) A material that allows electric current to pass through it easily
18. What is an insulator?
(A) A material that allows electric current to pass through easily
(B) A material that does not allow electric current to pass through easily
(C) A device used to produce electricity
(D) A source of electrical energy
Answer: (B) A material that does not allow electric current to pass through easily
19. Which of the following objects is most likely to conduct electricity?
(A) Metal spoon
(B) Plastic ruler
(C) Rubber eraser
(D) Wooden stick
Answer: (A) Metal spoon
20. A bulb does not glow when connected to a cell. Which of the following could be a possible reason?
(A) The circuit is incomplete
(B) The wire is conducting properly
(C) The switch is closed
(D) The circuit is complete
Answer: (A) The circuit is incomplete
21. Why is the plastic covering of an electric wire useful?
(A) Plastic is an insulator and helps protect us from electric current
(B) Plastic produces electricity
(C) Plastic makes the wire shorter
(D) Plastic increases the brightness of a bulb
Answer: (A) Plastic is an insulator and helps protect us from electric current
22. Which combination represents the correct flow path in a simple circuit?
(A) Cell → wire → bulb → wire → cell
(B) Bulb → bulb → switch → bulb
(C) Switch → plastic → wood → bulb
(D) Cell → rubber → plastic → bulb
Answer: (A) Cell → wire → bulb → wire → cell
23. What is meant by a closed electric circuit?
(A) A circuit with a complete conducting path
(B) A circuit with a broken wire
(C) A circuit without a source
(D) A circuit containing only an insulator
Answer: (A) A circuit with a complete conducting path
24. Which of the following is an example of an electrical appliance that uses an electric circuit?
(A) Torch
(B) Wooden chair
(C) Glass tumbler
(D) Notebook
Answer: (A) Torch
25. Which statement about an electric circuit is correct?
(A) Electric current can flow only when there is a complete conducting path
(B) Electric current always flows through plastic
(C) A bulb can glow without any source of electrical energy
(D) An open circuit always allows current to flow
Answer: (A) Electric current can flow only when there is a complete conducting path
