17. What substance glows when exposed to ultraviolet light?
A. Neon C. photoelectric
B. Phosphors D. Photons
18. What animals can see the ultraviolet light?
A. Dog C. Insect
B. Human D. Monkey
19. What type of electromagnetic wave is produced when electrons vibrate in an antenna?
A. Infrared C. Radio wave
B. Microwave D. X-ray
20. Which of the following energy transformations occur at the receiving station?
A. Sound energy to electrical energy
B. Electromagnetic energy to sound energy.
C. Electrical energy to electromagnetic energy
D. Electromagnetic energy to electrical energy
21. Which type of radio waves are used to broadcast FM station?
A. Low Frequency C. Ultra High Frequency
B. Extremely High Frequency D. Very High Frequency
Share
ANSWER:
17.B. Phosphors
18.A. Dog
19.C. Radio Wave
20.B. Electromagnetic energy to sound energy.
21.D. Very High Frequency
Explanation: