Computer Science 455
Instructor: R. P. Burton
First Quiz
January 20-21, 2004
Name _________________________________________ Score ____________/27
1. Computer graphics is applicable to all of the following automotive applications EXCEPT
a. exterior design
b. (internal) structural design
c. ingress and egress (getting in and out) testing
d. driver training
e. hazardous driving experimentation
f. (no exceptions here)
(f)
2. Computer graphics was welcomed with enthusiasm, right from the start, by
a. flight trainers
b. animators
c. artists in general
d. (all of the above)
e. (none of the above)
(e)
3. The use of computer graphics to provide training in vehicle operation
a. has been limited to aircraft and automobiles
b. has been extended to several other vehicles besides aircraft and automobiles
c. has been applied to virtually every kind of vehicle
(b)
4. The first widespread application of computer graphics to architecture was limited to
a. smaller “tract” homes
b. larger “custom” homes
c. LDS church buildings
d. Large (typically commercial) buildings
e. (it wasn’t limited; it was adopted almost overnight by architects of all kinds)
(d)
5. Even the man-on-the-street will concede that “a graph is worth a thousand numbers,” to him (to paraphrase an ancient saying).
a. true
b. false
(b)
6. Fractals remained “mathematical closet monsters” at least until the advent of computer graphics.
a. true
b. false
(a)
7. Modern computer graphics began in the early 60s, with the completion of Ivan Sutherland’s dissertation at M.I.T. Computer graphics became economically viable
a. immediately
b. within only two years
c. more than a decade later
d. with the advent of the World Wide Web in the 90s
(c)
8. Those who succeed as computer animators invariably are talented both as technicians (i.e. computer programmers with skill in computer graphics) and as (manual) artists.
a. true
b. false
(b)
9. “Computer graphics” and “image processing” are
a. synonyms
b. subset and superset, respectively
c. superset and subset, respectively
d. at opposite ends of a spectrum
(d)
10. Which of the following is/are shortcoming(s) of the conventional CRT?
a. weight
b. high voltages
c. limited resolution
d. susceptibility to burning the screen surface
e. (all of the above)
(e)
11. Which of the following plays the most significant role in determining how much of the screen is struck by a beam of electrons at any one instant?
a. the control grid
b. the focusing structure
c. the deflection structure
d. the graininess of the phosphor
e. (all play equivalently significant roles)
(b)
12. The longer the persistence of the phosphor, the more desirable the phosphor (excluding, of course, consideration of the cost of a high persistence phosphor).
a. true
b. false
(b)
13. Phosphors emit photons only while they are being bombarded by electrons.
a. true
b. false
(b)
14. What caused raster-scan monitors to become more common than random-scan monitors?
a. significant advancements in technology brought about by the television manufacturers
b. the public’s desire for color images
c. the precipitous drop in the price of computer memory
d. the advent of the personal computer
(c)
15. Why should a monitor be refreshed roughly 30 times per second (or more)?
a. to be compatible with established film frame rates
b. because virtually all phosphors cease to emit photons after longer delays
c. to accommodate the sampling rate of the human visual system
d. to be compatible with the 60 cycle rate provided by virtually all electrical utility companies
(c)
16. Which of the following was a significant deficiency of the beam penetration CRT?
a. it offered shades of only one color
b. it offered combinations of only two colors
c. it offered combinations of only three colors
d. the user needed to be shielded from relatively excessive beta radiation
e. it had nearly twice the weight of a conventional CRT
(b)
17. A typical shadow-mask CRT is capable of producing ______ of the colors visible in the natural world.
a. all
b. an overwhelming majority
c. about half
d. only a small fraction
(b)
18. For a direct view storage tube, where is the image stored?
a. in the frame buffer
b. in a refresh display list
c. in a storage grid which, literally, sits inside the cathode ray tube
d. it is burned onto photochromic film
(c)
19. Which of the following is characteristic of a plasma panel?
a. individual cells can be erased
b. once a cell is written, nothing is required to sustain it
c. its resolution (points/square inch) typically surpasses the resolution of a CRT
d. the speed with which individual cells can be written surpasses with speed with which the “pixels” of a CRT can be written
e. (all are characteristic of a plasma panel)
(a)
20. Suppose a polygon has vertices at (0,0), (3,0), (3,2), (2,2), (1,2), and (0,1). For the purpose of scan-line-filling this polygon, how many intersections with scan lines are generated by these six vertices?
a. none
b. one or two
c. three or four
d. five
e. six
f. more than six
(f – 7)
21. Suppose you wish to draw a DDA line from (100, 200) to (150, 350). By what amount does the y-coordinate change with each step?
a. 1/3
b. 1
c. 3
d. (none of the above)
(b)
22. How many of the following produce true 3D output: 1) varifocal mirrors, 2) “stereo boxes,” 3) bimodal projection systems, 4) shuttered systems, 5) head-mounted displays, 6) autostereographic presentations. 7) holographic systems, 8) rotating LED displays.
a. none
b. 1 or 2
c. 3 or 4
d. 5 or 6
e. 7 or 8
(a)
23. How many of the following approaches produce true 3D output: 1) stereolithography, 2) numerically controlled milling, 3) cell encoding.
a. none
b. 1 or 2
c. all three
(b)
24. Computer graphics, as discussed in class, concerns itself with
a. increasing the flow of information from the machine to the human user
b. increasing the flow of information from the human user to the machine
c. both (a) and (b)
(c)
25. In order for an input device to be useful, it must be possible to move at least part of the input device.
a. true
b. false
(b)
26. In order for an input device to be useful, it must respond predictably (ideally linearly) to the user’s motion.
a. true
b. false
(b)
27. The Rand Tablet consisted of 1024 wires in the “x” direction and 1024 wires in the “y” direction. Wires were distinguished by the Gray code associated with each. The code consisted of ____ bits.
a. 9
b. 10
c. 11
d. 12
(b)