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Multiple Choice
Directions: Read each item carefully. Write the letter of the correct answer.

1. Who discovered X-ray?
a. James Clerk Maxwell
b. Johann Wilhelm Ritter
c. Wilhelm Conrad Röntgen
d. Ernest Rutherford

2. Which of the following is required to propagate mechanical waves?
a. vacuum
b. medium
c. spectrum
d. electron

3. Electromagnetic waves X and Y are travelling in a vacuum. Wave X has higher frequency than wave Y.
a. Xtravels at a greater speed than Y.
c. Y travels at a speed twice than X.
b. Y travels at a greater speed than X.
d. X and Y travel at the same speed.

4. Refer to the figure below:
radio waves - microwaves - visible light - gamma rays.
The electromagnetic waves are arranged according to
a. increasing energies
b. increasing wavelength
c. decreasing frequencies
d. decreasing speed

5. Freddie's new investigatory project has a sensor that requires a high energy light source. Which of the following colors
should he use for his project?
c. green
d. blue
b. violet
a. red

6. In which medium can electromagnetic waves travel that mechanical waves cannot?
d. vacuum
c. gas
b. liquid
a. solid

7. What is the relationship between wavelength and frequency?
a. direct proportionality c. inverse square proportionality
b. inverse proportionality d. direct square proportionality

9. Which of the following is true about the characteristics of radio waves?
a. It has the highest frequency
c. It carries the highest energy
b. It has the smallest wavelength
d. It is an electromagnetic radiation

10. Radio waves are commonly used as communication signal carriers because they
a. are easily absorbed by other objects.
b. usually travel long distances.
c. produce heat.
d. produce sounds.

11. Which of the following is not true about the characteristics of radio waves?
a. It has one of lowest frequencies
b. It has one of the longest wavelengths
c. It has one of the lowest wavelengths
d. It is mechanical wave

12. Which waves can travel at the speed of light in a vacuum?
a. radio waves
b. water waves
c. sound waves
d. tidal waves

13. What type of EM waves have longer wavelengths than visible light and are commonly used in remote controls?
a. X-ray
b. microwaves
c. ultraviolet ray
d. infrared radiation

14. Which type of electromagnetic radiation is often used for sterilization of materials?
a. X-ray
b. microwaves
c. ultraviolet rays
d. infrared radiation

15. Which of the following in the only EM wave we can see with the unaided eye?
a. visible light
b. microwaves
c. ultraviolet rays
d. infared radiation