13. What type of electromagnetic waves are used to take
pictures of bones in medicines?
A Infrared rays
C. Radio waves
B. Gamma rays
D. X-rays
14. What type of waves are used to transmit cellular
messages?
A Gamma rays
C. Radio waves
B Microwaves
D. Visible light
15. What type of electromagnetic waves cause sunburns?
A. Infrared rays
C. Ultraviolet
B. Microwaves
D. Visible light
16. Which of the following is the correct application of
radio waves?
A Camera auto focusing
B. Radio broadcasting
C. Diagnosis of bone fractures
D. Sterilization of medical instrument
17. Which band of frequency is suitable for
communication over great distances?
A low frequency
B. Medium frequency
C very low frequency
0.extremely low frequency
18. All of these are uses of microwaves except...
A Radar
B.cooking food
C.using remotes
D.using cellphones​