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WorksheetsCEDD
Total questions: 60
Worksheet time: 40mins
In a circuit diagram, a black dot at a junction of wires represents:
Crossing wires without connection
A switch
A connected node
A short circuit
When two wires cross without connecting, the symbol used is:
A dot
A loop/hop
A zigzag line
A rectangle
In a single-cell battery symbol, the long line represents:
Negative pole
Positive pole
Ground
Fuse
A battery with multiple cells is represented by:
Two parallel lines only
Several pairs of long and short lines
A zigzag line
A circle with “B”
Which symbol represents an AC power supply?
Straight lines
Sine wave
Dotted circle
Zigzag
The function of a fuse is:
To increase voltage
To store energy
To protect circuits from excessive current
To amplify signals
If the fuse rating is exceeded, it will:
Increase resistance
Melt and open the circuit
Shorten the wire
Act as a switch
A push-button switch symbol is used for:
Slide switches
Momentary contact switches
Grounding
Lamps
The ground symbol usually indicates:
Positive voltage
Negative current
0V reference or Earth ground
A capacitor
What is the color code of grounding wires?
Red-Black
Yellow-Green
Blue-White
Brown
A lamp symbol with rays outward is used for:
Resistor
Illumination lamp
Fuse
Switch
An indicator lamp is commonly used in:
Streetlights
Dashboard warning lights
Transformers
Motors
Which device converts electricity into heat?
Motor
Heater (resistance)
Fuse
Capacitor
Which device converts electricity into motion?
Speaker
Motor
Microphone
Heater
A buzzer converts electricity into:
Light
Heat
Motion
Sound
Which symbol represents a microphone?
Circle with inward arrows
Triangle with a line
Zigzag line
Two plates
A speaker converts:
Sound → Electrical
Electrical → Sound
Heat → Electrical
Electrical → Motion
The main function of a fixed resistor is to:
Emit light
Limit current
Store charge
Switch circuits
A variable resistor symbol has:
Two curved plates
An arrow across resistor
A circle with M
A sine wave
An LDR (Light Dependent Resistor) has:
Arrows pointing toward the resistor
Arrows pointing away
A zigzag with a circle
A fuse-like symbol
An inductor is made by:
Winding copper wire on a core
Joining two resistors
Placing two plates
Using a diode
A non-polar capacitor is typically used in:
DC circuits
AC circuits
Transformers
Motors
A polarized capacitor is indicated by:
Two equal parallel lines
One straight + one curved line
Zigzag with arrow
Circle with A
An antenna symbol shows:
Parallel plates
Zigzag line
Vertical line with outward wave lines
Triangle with arrows
A voltmeter is connected in:
Series
Parallel
Both
None
An ammeter is connected in:
Series
Parallel
Across capacitor
Across fuse
A normal diode allows current to flow:
Both directions
Only in one direction
At high frequencies only
When reverse-biased
The cathode of a diode is marked with:
White/black stripe
Circle dot
Long line
Wavy line
The symbol for an LED includes:
Two outward arrows
Two inward arrows
Zigzag with arrow
Curved line
An IR LED emits:
Visible light
Infrared light (invisible)
X-rays
UV rays
A photodiode produces:
Sound waves
Current when exposed to light
Heat
Voltage drop
The forward voltage drop of a Schottky diode is about:
0.1V
0.2–0.3V
0.7V
1.5V
A bridge rectifier is used to:
Step down AC
Convert AC to DC
Store current
Measure voltage
A Zener diode is used for:
Switching
Voltage regulation
Amplification
Rectification
A varicap diode acts as:
Variable capacitor
Heater
Inductor
Resistor
A transformer works on:
Ohm’s Law
Electromagnetic induction
Capacitive effect
Current limiting
If a transformer symbol has no core lines, it is:
Air-core
Iron-core
Short circuit
Coil
A relay allows:
High current to flow directly
A low-voltage circuit to control a high-voltage circuit
Current to flow in one direction
Voltage storage
In a relay, NO contact means:
Normally open
Not operating
Normally off
No output
In a BJT symbol, the arrow direction indicates:
Voltage
Current flow
Resistance
Power
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