# Light and Electromagnetic Spectrum MCQ [Free PDF] – Objective Question Answer for Light and Electromagnetic Spectrum Quiz

1. Of the following, _________ has the maximum frequency.

A. UV Rays
B. Gamma Rays
C. Microwaves

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

2. In the Visible spectrum the ______ color has the maximum wavelength.

A. Violet
B. Blue
C. Red
D. Yellow

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

It is usually written as wavelength = c / frequency.

4. Electromagnetic waves can be visualized as a

A. sine wave
B. cosine wave
C. tangential wave
D. None of the mentioned

Electromagnetic waves are visualized as sinusoidal waves.

A. lumens
B. watts
C. Armstrong
D. hertz

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

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

Brightness is the 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

A massless particle containing a certain amount of energy is called a photon. 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

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

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

11. How is array operation carried out involving one or more images?

A. array by array
B. pixel by pixel
C. column by column
D. row by row

Any array operation is carried out on a pixel-by-pixel basis.

12. The property indicating that the output of a linear operation due to the sum of two inputs is the same as performing the operation on the inputs individually and then summing the results is called ___________

B. heterogeneity
C. homogeneity
D. None of the Mentioned

The property indicating that the output of a linear operation due to the sum of two inputs is the same as performing the operation on the inputs individually and then summing the results is called additivity.

13. The property indicating that the output of a linear operation to a constant time as input is the same as the output of operation due to original input multiplied by that constant is called _________

B. heterogeneity
C. homogeneity
D. None of the Mentioned

The property indicating that the output of a linear operation to a constant time as input is the same as the output of operation due to original input multiplied by that constant is called homogeneity.

14. Enhancement of differences between images is based on the principle of ____________

B. Homogeneity
C. Subtraction
D. None of the Mentioned

A frequent application of image subtraction is in the enhancement of differences between images.

15. A commercial use of Image Subtraction is ___________