Electricity Circuits and Their Components Class 7 MCQ
hardElectricity Circuits and Their Components Class 7 MCQ
Electricity Circuits and Their Components Class 7 MCQ
Question 1.
What is the function of an electric cell in a circuit?
(a) To break the circuit
(b) To glow when current passes
(c) To provide electrical energy
(d) To resist current
Answer:
(c) To provide electrical energy
Question 2.
Which terminal of an electric cell is marked with a plus sign (+)?
(a) Negative terminal
(b) Neutral terminal
(c) Ground terminal
(d) Positive terminal
Answer:
(d) Positive terminal
Question 3.
What causes the filament in an incandescent lamp to glow?
(a) Magnetic field
(b) Heat from sunlight
(c) Electric current passing through it
(d) Chemical reaction
Answer:
(c) Electric current passing through it
Question 4.
Which of the following statements about an LED is correct?
(a) It glows in both directions
(b) It has no terminals
(c) It glows only when connected correctly
(d) It glows without electricity
Answer:
(c) It glows only when connected correctly
Question 5.
What is the role of a switch in an electric circuit?
(a) To store energy
(b) To increase voltage
(c) To complete or break the circuit
(d) To generate electricity
Answer:
(c) To complete or break the circuit
Question 6.
In which direction is electric current considered to flow in a closed circuit?
(a) From negative to positive terminal
(b) From ground to neutral
(c) From positive to negative terminal
(d) In both directions
Answer:
(c) From positive to negative terminal
Question 7.
What is a circuit diagram?
(a) A real-life model of a circuit
(b) A written explanation of a circuit
(c) A symbolic representation of a circuit
(d) A 3D printed circuit
Answer:
(c) A symbolic representation of a circuit
Question 8.
Which of the following is a good conductor of electricity?
(a) Copper
(B) Plastic
(C) Wood
(D) Rubber
Answer:
(a) Copper
Question 9.
Which material is an insulator?
(a) Iron
(b) Aluminium
(c) Silver
(d) Glass
Answer:
(d) Glass
Question 10.
What happens if the positive terminal of an LED is connected to the negative terminal of a battery?
(a) It glows brightly
(b) It glows dimly
(c) It does not glow
(d) It explodes
Answer:
(c) It does not glow
Case Study
I. The Curious Torchlight
Nihal noticed his torchlight wasn't working during a power cut. He opened it and found the batteries inserted incorrectly. After correcting the terminals, positive to negative, the torch glowed again. This helped him understand how electric cells provide current in a circuit. He also learned that a complete path is essential for electricity to flow and light the bulb.
Question 1.
Why didn't Nihal's torchlight work at first?
(a) The bulb was broken
(b) There was no switch in the circuit
(c) The batteries were inserted incorrectly
(d) The wires were too long
Answer:
(c) The batteries were inserted incorrectly
Question 2.
What is necessary for the torch to light up?
(a) A strong magnet
(b) A complete circuit path
(c) Two negative terminals
(d) A larger battery
Answer:
(b) A complete circuit path
Question 3.
Electricity can flow even if the circuit path is incomplete. (True/False)
Answer:
False
Question 4.
The orientation of batteries affects the flow of electric current. (True/False)
Answer:
True
Question 5.
An electric cell provides the ............ in the circuit.
Answer:
current
II. Conductors vs. Insulators
While experimenting at home, Rohan tried connecting different materials between two wires in a circuit. The bulb glowed with metal and graphite but not with plastic or wood. He concluded that metals are conductors, allowing current to pass, while materials like plastic are insulators. This hands-on test helped him classify everyday objects based on their electrical conductivity.
Question 1.
Name one material Rohan used that acted as a conductor.
Answer:
Metal
Question 2.
What kind of materials do not allow electric current to pass through?
Answer:
Insulators
Question 3.
What did Rohan learn from connecting different materials in a circuit
Answer:
- He learned that conductors like metal and graphite allow electricity to pass, lighting the bulb.
- Insulators like plastic and wood do not allow current to pass.