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WorksheetsUnit Test STE Electronics
Total questions: 30
Worksheet time: 18mins
During a class discussion in a public school in Ilocos Norte, the teacher explained how early people sent messages over long distances using dots and dashes. What system was used?
Telegraph
Morse
Air
A teacher wants to listen to AM radio station in Ilocos Norte. What is the most applicable frequency that he needs to tune in?
747KHz
90.70 MHz
5000KHz
Who successfully demonstrated the transmission and reception of radio waves in experiments?
Heinrich Hertz
James Clerk Maxwell
Guglielmo Marconi
Who predicted the existence of electromagnetic waves that led to the development of radio receivers?
Heinrich Hertz
James Maxwell
Guglielmo Marconi
Alexander Graham Bell is best known for inventing which device that contributed to the development of electronic communication?
radio receiver
radio telegraph
telephone
The unit hertz (Hz) is used to measure:
signal strength
wavelength
frequency
Mobile phones communicate primarily using:
ultrasonic waves
sound waves
radio waves
Samuel Morse is best known for inventing:
the telephone
the telegraph
the radio receiver
The teacher explained that waveforms are drawn using time and height.
What does the height of a waveform show?
Amplitude
Speed
Frequency
Before electricity, early Filipino communities used drums and bells to warn people.
What type of signal was used?
Audio
Visual
Digital
A music producer wants to record sounds that vibrate 50,000 times per second. Which unit best represents the frequency of the sound waves being recorded?
Kilohertz (kHz)
Hertz (Hz)
Megahertz (MHz)
What is the primary function of signal transmission?
To design matching networks
To transfer data via signals
To generate raw data
What is a primary goal of Antenna Design Principles?
Efficient signal propagation
Data generation
Signal interpretation
A teacher asks students to identify which activity does not rely on radar technology. Which is NOT a real-life application of radar?
Air traffic control
Cooking food
Weather forecasting
A security system detects movement inside a restricted area and triggers an alarm. Which sensor is commonly used in security systems?
Motion sensor
Light sensor
Temperature sensor
A student is asked to arrange the correct sequence of how a receiver processes signals from reception to output. What is the correct order of a receiver’s working process?
Antenna → Amplifier → Output → Tuner → Demodulator
Antenna → Tuner → Amplifier → Demodulator → Output
Tuner → Antenna → Amplifier → Demodulator → Output
In factory automation, proximity sensors are installed to prevent accidents. What do they mainly detect to improve safety?
Position
Presence
Speed
A radio broadcast becomes weak after traveling a long distance, so a device boosts the signal before sending it again. Which signal reproducer is being used?
Signal-amplifier
Relay
Repeater
A teacher explains that sensors respond to changes in the environment and convert them into usable electrical signals. What does a sensor circuit do?
Sends radio waves
Converts physical changes into electrical signals
Converts electrical signals to sound
During a thunderstorm, communication systems experience disruption caused by natural phenomena. Which is an example of electromagnetic interference (EMI)?
Lightning and solar flares
Poor cable routing
Weak signal strength
While studying signal behavior, a student notices that AM stations like DZJC 747 kHz broadcast news and talk while FM stations like Love Radio 90.7 MHz focus on music and entertainment. Based on signal characteristics, which explanation is MOST reasonable?
AM’s long range suits talk/news that listeners follow over large areas
AM signals have higher fidelity than FM signals for music
FM signals travel by ground waves which distort music quality
During a class discussion, the teacher writes the full meaning of RADAR on the board and asks students to recall it. What does RADAR stand for?
Radio Data Analysis and Response
Radio Direction and Reading
Radio Detection and Ranging
The oscillator in a radio receiver primarily:
converts electrical signals to sound
generates a signal for mixing with the incoming radio wave
powers the speaker
What process in a receiver extracts information from the carrier wave?
modulation
amplification
demodulation
Which type of radio signal is more resistant to static and noise?
AM
FM
PM
AM signals are more susceptible to (a) than FM signals.
The relationship between wavelength and frequency is (a) proportional.
The component in a receiver that extracts audio or data from the carrier wave is the (a) .
In AM radio, the (a) of the carrier wave is varied to carry information.
Radars use (a) waves to detect objects and measure distance.
