Computer Science 455
Instructor: R. P. Burton
First Quiz
September 16-17, 2002

Name _________________________________________	Score ____________/19

1.	Computer graphics has applications in all of the following except
a.	science, medicine, and engineering
b.	business and defense
c.	design, art, and entertainment
d.	education
e.	the exploration of hyperspace and other mathematical spaces
f.	(no exceptions here)

(f)

2.	For most intents and purposes, "computer graphics" and "image processing" are 
synonyms.
a.	true
b.	false

(b)

3.	From its beginnings with Ivan Sutherland's work in 1963, computer graphics has 
been appealing, practical, and affordable.
a.	true
b.	false

(b)

4.	Which of the following occurs first when producing an image on a CRT?
a.	fluorescence
b.	phosphorescence
c.	refresh

(a)

5.	Which of the following best describes a beam penetration CRT?
a.	it has a penetrable storage grid which obviates the need for refresh
b.	its very high power beam produces photons not only by striking the 
phosphor, but also by penetrating the phosphor so that the electrons 
themselves become visible
c.	it has a limited spectrum of colors, typically with no blues

(c)

6.	How many electron guns does a typical shadow-mask CRT have?
a.	just one, but a special "mask" that effectively creates three beams of 
electrons
b.	three: one for red, one for blue, and one for green
c.	none; the mask itself serves as a source of electrons from current which 
flows continuously through the mask

(b)

7.	What particular problem did the Direct-view Storage Tube solve?
a.	The bulk and high voltages of the conventional CRT.
b.	The monochrome characteristics of the conventional CRT
c.	The need to constantly refresh the conventional CRT

(c)

8.	Which of the following is NOT characteristic of the plasma panel?
a.	cells can be written and erased
b.	no refresh is required
c.	writing an image is fast relative to writing a CRT image
d.	(all of the above are characteristic of the plasma panel)

(c)

9.	Even in its least expensive form, display hardware for producing stereoscopic 
images is almost twice as expensive as display hardware for producing 
monoscopic images.
a.	true
b.	false

(b)

10.	Which of the following provides true 3D output?
a.	holography
b.	spinning LED panels
c.	an autostereogram
d.	stereolithography
e.	(none of the above provide true 3D output)

(d)

11.	Early mice, such as the SRI mouse, had two rotating metal wheels that slipped 
easily on the Formica tables that sat in front of monitors.  Mouse pads were yet to 
be invented.  The metal wheels/Formica combination made the SRI mouse 
virtually useless as an input device.  It was not until the invention of the mouse 
with "the ball in the belly" and the mousepad that mice became practical.
a.	true
b.	false

(b)

12.	In order for a joystick or a spaceball to be usable, it has to be moveable relative to 
the base in which it sits.
a.	true
b.	false

(b)

13.	Suppose the Rand tablet consists of 1024 horizontal wires and 1024 vertical 
wires, each of which is distinguishable from all the others.  How many bits are 
needed for the signal associated with each wire?
a.	10
b.	11
c.	12

(a)

14.	The stylus associated with a two-dimensional acoustic tablet emits a noise which 
is heard simultaneously by both strip microphones after time t.  How many 
different locations can the stylus' noise emitter be in to produce this result after 
time t?
a.	just one
b.	two
c.	four
d.	eight
e.	lots more than eight

(e)

15.	Reducing the weight of a light pen by 50% reduces by 50% the effort required to 
touch the display surface with the light pen.  Hence the thrust to produce ever 
lighter light pens.
a.	true
b.	false

(b)

16.	Any of the logical input devices discussed in class can be modeled by any of the 
physical input devices discussed in class.
a.	true
b.	false

(a)

17.	What is the primary purpose of normalized device coordinates?
a.	to define a common coordinate space in which all users can work
b.	to define a common coordinate system to be adopted for all output devices
c.	to provide a bridge between any of several different applications and the 
output device to which they all write
d.	to achieve independence from the output devices

(d)

18.	Suppose a line is to be drawn between (25,50) and (75, 200).  What is the line 
length estimate (used to determine the number of steps) for the simple DDA?
a.	sqrt (502 + 1502)
b.	50
c.	64
d.	150
e.	200
f.	256

(d)

19.	Suppose a line is to be drawn between (25,50) and (75, 200).  What is the line 
length estimate for the symmetric DDA?
a.	sqrt (502 + 1502)
b.	50
c.	64
d.	150
e.	200
f.	256

(f)