Online Test — Electric Current and its Effects
25 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 25
The flow of electric charge through a conducting path is called:
Voltage
Electric current
Resistance
Frequency
Explanation: Electric current is the flow of electric charge through a conductor.
Question 2 of 25
A bulb in a circuit glows only when the circuit is:
Open
Broken
Closed (complete)
Switched off
Explanation: Current flows only in a closed, complete circuit, allowing the bulb to glow.
Question 3 of 25
In a circuit diagram, an ammeter is represented by a circle containing the letter:
V
A
R
C
Explanation: An ammeter, which measures current, is shown as a circle with the letter A inside.
Question 4 of 25
In a cell symbol, the positive terminal is shown by the:
Short thick line
Long thin line
Circle with a cross
Zig-zag line
Explanation: The longer, thinner line of the cell symbol marks the positive terminal.
Question 5 of 25
Standard circuit symbols are used in diagrams mainly because they are:
Colourful
Simple and standardised
Realistic pictures
Difficult to draw
Explanation: Symbols are simple, standard, and make circuits quick to draw and easy to understand.
Question 6 of 25
In a series circuit, the components are connected:
On separate branches
One after another in a single loop
Across each other
Without any wires
Explanation: Series components are joined one after another, giving a single current path.
Question 7 of 25
If one bulb fuses in a series circuit, the other bulbs will:
Glow brighter
Keep glowing normally
All stop glowing
Glow dimmer
Explanation: A fused bulb breaks the single path, so all bulbs in a series circuit go off.
Question 8 of 25
Home wiring is usually done in a circuit of the type:
Series
Parallel
Open
Broken
Explanation: Parallel wiring lets each appliance work independently at full brightness.
Question 9 of 25
In a parallel circuit, the current has:
Only one path
More than one path
No path
A broken path
Explanation: Parallel branches give the current more than one path to flow through.
Question 10 of 25
Two identical bulbs glow brighter when connected in:
Series
Parallel
An open circuit
A broken circuit
Explanation: In parallel, each bulb gets the full supply, so the bulbs glow brighter than in series.
Question 11 of 25
The production of heat when current flows through a wire is called the:
Magnetic effect
Heating effect
Chemical effect
Lighting effect
Explanation: Current flowing through a conductor produces heat — the heating effect of current.
Question 12 of 25
The opposition offered by a material to the flow of current is called:
Voltage
Current
Resistance
Power
Explanation: Resistance is the opposition of a material to the flow of electric current.
Question 13 of 25
The heating elements of appliances like irons and heaters are usually made of:
Copper
Nichrome
Aluminium
Silver
Explanation: Nichrome has high resistance and withstands high temperatures without spoiling.
Question 14 of 25
An electric fuse protects a circuit by:
Increasing the current
Melting and breaking the circuit
Storing charge
Reflecting heat
Explanation: The fuse melts during excess current, breaking the circuit and protecting it.
Question 15 of 25
The filament of an electric bulb glows because it is made of a high-resistance metal called:
Copper
Tungsten
Nichrome
Iron
Explanation: The bulb's tungsten filament has high resistance and a high melting point, so it glows white-hot.
Question 16 of 25
An electric current flowing through a wire produces around it a:
Magnetic field
Sound wave
Light beam
Vacuum
Explanation: A current-carrying wire produces a magnetic field — the magnetic effect of current.
Question 17 of 25
A coil of insulated wire wound on a soft iron core that acts as a magnet only when current flows is a(n):
Permanent magnet
Electromagnet
Fuse
Resistor
Explanation: An electromagnet is magnetic only while current flows through its coil.
Question 18 of 25
The strength of an electromagnet can be increased by:
Reducing the turns
Increasing the current
Removing the core
Using less wire
Explanation: Increasing the current (and turns, and using an iron core) strengthens an electromagnet.
Question 19 of 25
An electromagnet is preferred in a scrap-lifting crane because it can be:
Made permanent
Switched on and off
Made of steel
Used without current
Explanation: An electromagnet can be switched on to lift and off to drop the load.
Question 20 of 25
The discovery that a current deflects a nearby compass needle was made by:
Newton
Oersted
Faraday
Edison
Explanation: Oersted discovered the magnetic effect of current using a compass near a wire.
Question 21 of 25
The electric bell works on the principle of the:
Heating effect
Electromagnet
Chemical effect
Reflection of sound
Explanation: The bell uses an electromagnet (the magnetic effect of current) to move the hammer.
Question 22 of 25
In an electric bell, the part that is struck to produce sound is the:
Armature
Spring
Gong
Contact screw
Explanation: The hammer strikes the gong, the metal cup that produces the ringing sound.
Question 23 of 25
The bell rings continuously while the switch is pressed because of a:
Single strike
Make-and-break circuit
Permanent magnet
Open circuit
Explanation: The repeated make-and-break of the circuit rings the bell over and over.
Question 24 of 25
The core of the electromagnet in a bell is made of soft iron because it:
Stays magnetised always
Magnetises and demagnetises quickly
Never becomes magnetic
Conducts no current
Explanation: Soft iron gains and loses magnetism quickly, enabling the rapid ringing cycle.
Question 25 of 25
When the switch of an electric bell is released, the bell:
Rings louder
Keeps ringing
Falls silent
Heats up
Explanation: Releasing the switch keeps the circuit open, so the electromagnet stops and the bell is silent.