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WorksheetsDigital Electronics Review
Total questions: 33
Worksheet time: 18mins
What is the unit of resistance?
Ohm
Watt
Volt
Ampere
Which component stores electrical energy in an electric field?
Resistor
Capacitor
LED
DC Motor
What does LED stand for?
Light Emitting Diode
Low Energy Device
Linear Electric Device
Light Energy Detector
Which device changes its resistance based on the amount of light it receives?
Photoresistor
Capacitor
Servo Motor
MOSFET
Which of the following is a type of variable resistor?
Potentiometer
LED
Capacitor
DC Motor
What is the main function of a servo motor?
Precise position control
Light detection
Energy storage
Voltage regulation
Which component is used to control high power devices with a low power signal?
MOSFET
Resistor
Capacitor
LED
Which color is NOT typically found in a standard multicolor LED?
Red
Green
Blue
Orange
What does DC stand for in DC Motor?
Direct Current
Double Circuit
Dynamic Control
Digital Circuit
Which of the following is a polarized capacitor?
Electrolytic capacitor
Ceramic capacitor
Film capacitor
Mica capacitor
If a resistor has color bands brown, black, red, what is its resistance value?
1kΩ
100Ω
10Ω
1Ω
Which application best uses a photoresistor?
Automatic street lights
Audio amplifiers
Motor speed control
Voltage regulation
A capacitor marked "104" has what value?
0.1μF
1μF
10μF
0.01μF
Which of the following best describes how a servo motor is controlled?
By varying the width of a pulse signal
By changing the supply voltage
By adjusting resistance
By changing the color of light
If you connect an LED directly to a 9V battery without a resistor, what is likely to happen?
The LED will burn out
The LED will glow brighter
The LED will not light up
The LED will change color
Which type of MOSFET is commonly used for switching applications?
N-channel
P-channel
Bipolar
Triac
A DC motor is connected to a battery and a switch. What happens when the switch is closed?
The motor starts rotating
The motor emits light
The motor stores energy
The motor changes color
Which of the following is NOT a function of a resistor in a circuit?
Limiting current
Storing charge
Dividing voltage
Pull-down or pull-up
What happens to the resistance of a photoresistor as light intensity increases?
Resistance decreases
Resistance increases
Resistance stays the same
Resistance becomes zero
Which of the following is a characteristic of a ceramic capacitor?
Non-polarized
High capacitance
Used for energy storage in power supplies
Has a positive and negative terminal
Which color band represents the multiplier in a 4-band resistor code?
Third band
First band
Second band
Fourth band
What is the main advantage of using a multicolor LED?
It can display different colors using one device
It consumes more power
It is larger in size
It only emits red light
Which component would you use to smooth out voltage fluctuations in a power supply?
Capacitor
Resistor
LED
Photoresistor
What is the typical forward voltage drop of a red LED?
1.8V to 2.2V
3.0V to 3.5V
0.7V
5.0V
Which of the following best describes the function of a MOSFET in a motor driver circuit?
Acts as an electronic switch
Stores electrical energy
Emits light
Measures resistance
If a DC motor is connected in reverse, what happens?
It rotates in the opposite direction
It stops working
It emits light
It increases speed
Which of the following is NOT a type of capacitor?
Inductive capacitor
Ceramic capacitor
Electrolytic capacitor
Film capacitor
What is the purpose of a current-limiting resistor in series with an LED?
To prevent excessive current through the LED
To increase the brightness
To change the color
To store energy
Which of the following best describes the operation of a photoresistor in a light-sensitive circuit?
It decreases resistance as light increases
It increases resistance as light increases
It emits light when voltage is applied
It stores energy
Which component is most suitable for controlling the speed of a DC motor electronically?
MOSFET
LED
Photoresistor
Capacitor
A (a) is a complete electrical path. An (b) is an electrical path that is not complete.
On the top of most batteries, electrons go in the (a) terminal and out of the (b) terminal at the bottom.
A circuit has to be (a) in order to produce electricity.
