# Digital Image Processing Questions and Answers – Light and the Electromagnetic Spectrum

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This set of Digital Image Processing Multiple Choice Questions & Answers (MCQs) focuses on “Light and the Electromagnetic Spectrum”.

1. Of the following, _________ has the maximum frequency.
a) UV Rays
b) Gamma Rays
c) Microwaves

Explanation: Gamma Rays come first in the electromagnetic spectrum sorted in the decreasing order of frequency.

2. In the Visible spectrum the ______ colour has the maximum wavelength.
a) Violet
b) Blue
c) Red
d) Yellow

Explanation: Red is towards the right in the electromagnetic spectrum sorted in the increasing order of wavelength.

3. Wavelength and frequency are related as : (c = speed of light)
a) c = wavelength / frequency
b) frequency = wavelength / c
c) wavelength = c * frequency
d) c = wavelength * frequency

Explanation: It is usually written as wavelength = c / frequency.
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4. Electromagnetic waves can be visualised as a
a) sine wave
b) cosine wave
c) tangential wave
d) None of the mentioned

Explanation: Electromagnetic waves are visualised as sinusoidal wave.

a) lumens
b) watts
c) armstrong
d) hertz

Explanation: Radiance is the total amount of energy that flows from the light source and is measured in Watts.

6. Which of the following is used for chest and dental scans?
a) Hard X-Rays
b) Soft X-Rays
d) Infrared Rays

Explanation: Soft X-Rays (low energy) are used for dental and chest scans.

7. Which of the following is impractical to measure?
a) Frequency
c) Luminance
d) Brightness

Explanation: Brightness is subjective descriptor of light perception that is impossible to measure.

8. Massless particle containing a certain amount of energy is called
a) Photon
b) Shell
c) Electron
d) None of the mentioned

Explanation: Each bundle of massless energy is called a Photon.

9. What do you mean by achromatic light?
a) Chromatic light
b) Monochromatic light
c) Infrared light
d) Invisible light

Explanation: Achromatic light is also called monochromatic light.(Light void of color)

10. Which of the following embodies the achromatic notion of intensity?
a) Luminance
b) Brightness
c) Frequency

Explanation: Brightness embodies the achromatic notion of intensity and is a key factor in describing color sensation.

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To practice all areas of Digital Image Processing, here is complete set of 1000+ Multiple Choice Questions and Answers.