Computer Science 455
Instructor: R. P. Burton
First Quiz
September 12-14, 2005
Name _________________________________________ Score ____________/24
1.When first the U S Navy was approached with the prospect of flight training using graphic simulators, they reacted with
a.enthusiasm
b.indifference
c.disinterest
(c)
2.When first Disney was approached with the prospect of making movies using computer graphics techniques, they reacted with
a.enthusiasm
b.indifference
c.distain
(c)
3.Even though computer graphics can be used to design machine parts, automobiles, circuits, etc., the intended product must be built before testing can begin.
a.true
b.false
(b)
4.What is the state of the art relative to computer graphics for architectural design?
a.Large commercial structures with modularity and repetition only.
b.Most commercial structures with modularity and repetition only.
c.Residential structures Ð floor plans and elevations only
d.Residential structures Ð floor plans, elevations, and 3D graphics models which the client can Òwalk throughÓ
(d)
5.Computer graphics can be used to simulate real phenomena, but falls short of presenting phenomena which cannot be observed in the real world.
a.true
b.false
(b)
6.Computer graphic became economically viable
a.right from its inception in the 60s
b.not until the mid 70s
c.not until the late 90s
(b)
7.Most people (certainly including computer scientists) can read data easily from graphs, charts, etc.
a.true
b.false
(b)
8.Vehicle simulation is
a.expensive and generally limited to contexts with substantial financial resources
b.commonplace for virtually all kinds of vehicles
(a)
9.The advent of CRT technology _______ the advent of computer graphics.
a.came about as a consequence of
b.preceded
(b)
10.The ÒcathodeÓ in a CRT
a.Òboils offÓ electrons
b.produces a narrow beam of electrons
c.deflects a beam of electrons
d.takes electrons and produces photons
(a)
11.Long-persistence phosphors are
a.desirable, but expensive and fragile
b.generally undesirable
(b)
12.The era when memory was expensive (and hence relatively small in capacity) was dominated by ______-scan systems.
a.random
b.raster
(a)
13.The beam-penetration CRT
a.included a storage grid which obviated the need for periodic refresh
b.was a multi-color (albeit limited spectrum) display device
c.wrote directly to a display surface using a monochrome laser system
(b)
14.What is the purpose of a shadow mask?
a.to surround each pixel with black, causing the user to perceive a blend of color between pixels
b.to eliminate ghosting and aliasing
c.to restrict the directions electrons can travel
d.(all of the above)
(c)
15.The much anticipated plasma panel solved all the historic problems of the traditional CRT EXCEPT
a.substantial weight
b.high voltage requirements
c.limited color range
d.fragility
e.(all of these problems were solved by the plasma panel)
(c)
16.LCD displays are classified as
a.emissive
b.nonemissive
(a)
17.Which of the following techniques provides true 3D output?
a.holography
b.stereolithography
c.bimodal projection
d.autostereography
e.(all of these techniques)
f.(none of these techniques)
(b)
18.What is the source of the Òjaggies?Ó
a.roundoff error
b.an aspect ratio other than 1:1
c.the discrete nature of the pixel grid
d.phosphor persistence
(c)
19.How many points are plotted by the DDA algorithm for a line between (1,1) and (100,200)?
a.100
b.more than 100, but not more than 200
c.more than 200, but not more than SQRT (1002 + 2002 )
d.more than SQRT (1002 + 2002 ) but not more than 300
e.more than 300
(b)
20.Monitor screen present neither points nor lines, but small/narrow areas.
a.true
b.false
(a)
21. How many points are plotted by the symmetric DDA algorithm for a line between (0,0) and (100,200)?
a.100
b.more than 100, but not more than 200
c.more than 200, but not more than SQRT (1002 + 2002 ) which is 223.6
d.more than SQRT (1002 + 2002 ) but not more than 300
e.more than 300
(d Ð 256)
22.A polygon to be filled using the scan-line fill algorithm consists of 6 vertices. Each vertex contributes ____ intersection points to the collection of Òedge Ð scanlineÓ intersection points.
a.0
b.exactly 1
c.at least 1
d.2
(c)
23.Suppose you have a polygon consisting of vertices A, B, C, D, E, and F (in that order) positioned as shown:
A
C
D
B
E F
Which is the fourth edge on the active edge list?
a.AB
b.BC
c.CD
d.DE
e.EF
f.FA
(b)
24.Continuing the previous question (and using an active edge list) if vertices A and E are 100 scanlines apart, how many Òedge/scanlineÓ intersection points are generated and in need or sorting?
a.2 to 99
b.100 to 199
c.200 to 299
d.300 to 399
e.400 or more
f.(none of the above)
(f Ð 0)