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MCQ | Random Scan and Raster Scan in Computer Graphics

Multiple choice questions and answers (MCQ) based on the random scan and raster scan in computer graphics with 4 choices, correct answer and explanation.
Submitted by IncludeHelp, on April 11, 2021

Question 1: What are Random scan and Raster scan techniques?

  1. Techniques to display an image on the screen
  2. Line Drawing Techniques
  3. Polygon Drawing Techniques
  4. None of the above

Answer: a. Techniques to display an image on the screen

Explanation:

The Random scan and rater scan are the display techniques using which (any one) an image is displayed on the screen.


Question 2: Which among the following is best suited for a smooth line drawing on the screen?

  1. Random Scan Display Algorithm
  2. Raster Scan Display Algorithm
  3. Both a. and b.
  4. None of the above

Answer: a. Random Scan Display Algorithm

Explanation:

The Random scan display algorithm is best suited for line drawing because it uses an electron beam which operates like a pencil to create a line on the screen.


Question 3: Which among the following is best suited for a realistic shaded image drawing on the screen?

  1. Random Scan Display Algorithm
  2. Raster Scan Display Algorithm
  3. Both a. and b.
  4. None of the above

Answer: b. Raster Scan Display Algorithm

Explanation:

The Raster scan display algorithm is best suited for realistic shaded drawing because it is works upon the intensity of the pixels. Hence, the value of every pixel is assigned from the starting pixel to the ending one. Hence, a shaded realistic image can be best drawn using this technique.


Question 4: Which of the following options is correct in accordance with the Random Scan Display Algorithm?

  1. It is best suited for line drawing algorithm.
  2. It has a high resolution.
  3. It has an electron beam which strikes only that part of the screen where the drawing is needed.
  4. All of the above

Answer: d. All of the above

Explanation:

All the given options are correct in accordance to the random scan display technique in a Cathode Ray tube.


Question 5: Which among the following are the types of scanning or travelling of beam in a raster scan display technique?

  1. Interlaced Scanning
  2. Non- Interlaced Scanning
  3. Spiral Scanning
  4. All of the Above

Answer: c. Spiral Scanning

Explanation:

There is no scanning technique such as spiral scanning in the rater scan display technique.


Question 6: In ___ a beam of an electron is moved across the screen. It moves from top to bottom considering one row at a time.

  1. Raster Scan Display
  2. Random Scan Display
  3. Both A and B
  4. None of the above mentioned

Answer: a. Raster Scan Display

Explanation:

In Raster Scan Display a beam of an electron is moved across the screen. It moves from top to bottom considering one row at a time.


Question 7: A beam of electron moves through each row, its intensity is alternatively turned ___ which helps to create a pattern of spots that are illuminated.

  1. On and off
  2. Power interrupt
  3. Up and down
  4. All of the above mentioned

Answer: a. On and off

Explanation:

A beam of electron moves through each row, its intensity is alternatively turned On and Off which helps to create a pattern of spots that are illuminated.


Question 8: Which of the following is a better option for drawing a smooth line on the screen?

  1. Raster Scan Display
  2. Random Scan Display
  3. Both A and B
  4. None of the above mentioned

Answer: b. Random Scan Display

Explanation:

Since it uses an electron beam which acts like a pencil to build a line on the panel, Random scan display is ideally adapted for line drawing.


Question 9: A 900 rotation can be done using the raster scan technique for transformation ___

  1. Using coping every row of a block into a column in a new frame buffer location
  2. Using drawing a line
  3. Using refresh a frame buffer
  4. None of the above mentioned

Answer: a. Using coping every row of a block into a column in a new frame buffer location

Explanation:

A 900 rotation can be done using the raster scan technique for transformation using coping every row of a block into a column in a new frame buffer location.


Question 10: In ___ a beam of the electron is directed only to the screen areas where any picture has to be displayed or drawn on the screen.

  1. Video Display
  2. Raster Scan Display
  3. Random Scan Display
  4. All of the above mentioned

Answer: c. Random Scan Display

Explanation:

In Random Scan Display a beam of the electron is directed only to the screen areas where any picture has to be displayed or drawn on the screen.


Question 11: The resolution of random scan is higher than raster scan.

  1. True
  2. False

Answer: a. True

Explanation:

The resolution of random scan is higher as compare to raster scan.


Question 12: Raster scan systems generally use ___ to display an image.

  1. Frame buffer
  2. Display controller
  3. Display file program
  4. None of the These

Answer: a. Frame buffer

Explanation:

In a raster scan system, an electron beam sweeps through the panel, one row at a time, from top to bottom. In his process a frame buffer uses.


Question 13: With reference to Random Scan Display, which of the following options is correct?

  1. It has an electron beam that directed only to the screen areas where any picture has to be displayed.
  2. It has a good pixel amount.
  3. It's ideal for line drawing.
  4. All of the above mentioned.

Answer: d. All of the above mentioned.

Explanation:

In the Random Scan Display technique, it has an electron beam that directed only to the screen areas where any picture has to be displayed. Random Scan Display has a good pixel amount and also an ideal method for line drawing.


Question 14: Which one of the following does not fit for Random Scan and Raster Scan?

  1. Polygon Drawing Techniques
  2. Line Drawing Techniques
  3. Techniques to display an image on the screen
  4. Only A

Answer: a. Polygon Drawing Techniques

Explanation:

Random scan and rater scan are two display methods that can be used to display image on the screen.


Question 15: With reference to Random Scan Display the beam of electron moves to the left top corner of the screen to move to another frame. This motion is referred to as ___

  1. Vertical retrace
  2. Horizontal retrace
  3. Scan line
  4. All of the above mentioned

Answer: a. Vertical retrace

Explanation:

With reference to Random Scan Display, the beam of electron moves to the left top corner of the screen to move to another frame. This motion is referred to as Vertical retrace.


More...

  1. MCQ | Introduction to Computer Graphics
  2. MCQ | Cathode Ray Tube (CRT) in Computer Graphics
  3. MCQ | Line Filling Algorithms in Computer Graphics
  4. MCQ | Graphics Hardware and Display Devices in Computer Graphics
  5. MCQ | Scan Conversion in Computer Graphics
  6. MCQ | Line Drawing Algorithms in Computer Graphics
  7. MCQ | Circle Drawing and Ellipse Drawing Algorithms in Computer Graphics
  8. MCQ | Types of Transformations (Translation, Rotation and Scaling) in Computer Graphics
  9. MCQ | Bresenham's Algorithm in Computer Graphics
  10. MCQ | Window to Viewport Transformation in Computer Graphics
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