The following 20 Multiple Choice Questions (MCQ) are based on
Chapter 3: Electricity: Circuits and their Components from the NCERT Class 7
Science textbook Curiosity. Each question has four options - select the
best answer and click to check.
Instructions: Read each question carefully. Choose the most
appropriate option from (a), (b), (c), or (d). Click
Show Answer to reveal the correct answer with explanation.
Multiple Choice Questions
1An electric cell is a source of:
(a) Electrical energy
(b) Only light
(c) Magnetic material
(d) Mechanical force only
(a) is correct
Chemical energy in a cell is converted into electrical energy.
2The raised metal cap of a typical dry cell is the:
(a) Negative terminal
(b) Insulator
(c) Switch
(d) Positive terminal
(d) is correct
The cap is marked positive, while the flat base is usually negative.
3A battery is formed by:
(a) Joining only switches
(b) Breaking a wire
(c) Connecting two or more cells
(d) Using a lamp without cells
(c) is correct
Cells can be connected to provide greater electrical effect or capacity.
4For cells connected in series correctly, the positive terminal of one is joined to:
(a) No conductor
(b) The negative terminal of the next
(c) The positive terminal of the next
(d) The glass bulb
(b) is correct
Opposite terminals are joined so their potential differences add.
5The thin wire inside an incandescent lamp is called the:
(a) Filament
(b) Terminal
(c) Switch
(d) Cell
(a) is correct
Current heats the filament until it glows.
6An electric lamp glows only when its two terminals are connected in:
(a) An open circuit
(b) The same terminal of a cell only
(c) An insulating path
(d) A complete circuit with a working source
(d) is correct
A closed conducting path allows current through the lamp.
7An open circuit is one in which:
(a) The switch is necessarily ON
(b) All parts are conductors
(c) The conducting path is broken
(d) Current has a complete path
(c) is correct
A gap prevents current from flowing.
8The function of an electric switch is to:
(a) Store water
(b) Open or close a circuit
(c) Create matter
(d) Measure temperature
(b) is correct
A switch controls current by making or breaking the conducting path.
9When a switch is in the ON position, it usually:
(a) Closes the circuit
(b) Breaks the circuit
(c) Removes the cell
(d) Changes a conductor into an insulator
(a) is correct
Closing the contacts completes the current path.
10Why are standard circuit symbols used?
(a) To make circuits work without wires
(b) To replace components physically
(c) To hide connections
(d) To represent circuits clearly and consistently
(d) is correct
Shared symbols make circuit diagrams easy to draw and interpret.
11Which material is an electrical conductor?
(a) Dry wood
(b) Plastic
(c) Copper
(d) Rubber
(c) is correct
Copper allows electric current to pass readily.
12Which material is an electrical insulator?
(a) Copper
(b) Rubber
(c) Aluminium
(d) Iron
(b) is correct
Rubber strongly resists electric current and is used around wires.
13Why is insulation removed from the ends of connecting wires?
(a) To expose metal for electrical contact
(b) To stop all current
(c) To make the wire longer
(d) To create a cell
(a) is correct
Bare metal must touch the terminals to complete a conducting path.
14A lamp fails to glow in a closed-looking circuit. Which is a possible cause?
(a) A complete conducting path
(b) A working cell
(c) Clean metal contacts
(d) A broken filament
(d) is correct
A broken filament opens the lamp's internal circuit.
15An LED usually glows only when:
(a) No cell is present
(b) Both leads are insulated
(c) Its leads are connected with correct polarity
(d) Its leads touch the same cell terminal
(c) is correct
An LED conducts mainly in one direction, so reversing it may prevent light.
16To test whether an unknown material conducts electricity, place it:
(a) On a magnet only
(b) In the gap of a simple tester circuit
(c) Beside a disconnected lamp
(d) Inside an empty box
(b) is correct
If the test material completes the path, the indicator can show current flow.
17A torch produces light when:
(a) Its switch completes the cell-lamp circuit
(b) Its cells are reversed against one another
(c) The filament is broken
(d) All contacts are insulated
(a) is correct
Correctly connected cells drive current through the lamp when the switch closes.
18Why are conducting wires often covered with plastic?
(a) Plastic increases current through the metal
(b) Copper is an insulator
(c) The covering produces electricity
(d) Plastic insulation protects users and prevents unwanted contact
(d) is correct
The outer insulator keeps current confined to the metal conductor.
