1. What will happen to the microwave if it penetrates the food being heated?
A. It agitates the water molecules within the food.
B. It creates molecular friction which then produces heat that will cook the food.
C. It interacts with electrical signals causing the water molecules to produce higher amount of kinetic energy.
D. Both A and B.
2. How does the amplitude modulation (AM) differs from Frequency Modulation (FM)?
A. In amplitude modulation, the modulated wave has a constant frequency but varying amplitude while in frequency modulation, the amplitude is contant and the frequency changes as the sound signal.
B. In amplitude modulation, the modulated wave has a varrying frequency but constant amplitude while in frequency modulation, the amplitude is contant and the frequency changes as the sound signal.
C. In amplitude modulation, the modulated wave has a changing frequency and varying amplitude while in frequency modulation, the amplitude is contant and the frequency changes as the sound signal.
D. In amplitude modulation, the modulated wave has a constant frequency but varying amplitude while in frequency modulation, the amplitude and frequency are contant.
3. What is the process by which the carrier waves change according to the amplitude or frequency of the sound?
A. Modulation
B. Dielectric heating
C. Transmission
D. Propagation
4. The term RADAR is derived from the phrase “radio detection and ranging." Which of the following is NOT an application of RADAR?
A. It is used to track weather disturbances
B. Used for civilian purposes to track airplanes and traffic violators
C. It transmits TV signals
D. It is primarily used for military purposes, to search for enemy ships and aircraft.
5. Which are the carrier waves used in television broadcasting?
A. AM
B. Radio transmitter
C. FM
D. Both AM and FM​