### Computer Science

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COMPUTER GRAPHICS

Multiple choice questions

1. Smallest size object that can be displayed on a monitor is called .....................

a) Picture element b) Point

c)Dot Pitch

d) aspect ratio

Ans: Picture element

2. Each screen point is referred to as .........................

a) Resolution

b)Pixel

c)Persistence

Ans: Pixel

d)Dot Pitch

3. On a monochromatic monitor, the frame buffer is known as ......................

a) Display file

b) Pixmap

c) Bitmap

d) Refresh buffer

Ans: Bitmap

4. On a color monitor, the refresh buffer is also called .....................

a)Frame buffer

b)Pixmap

c)Bitmap

d)Display file

Ans: Pixmap

5. .................. refers to pixel spacing.

a)Pixmap b)Resolution c)Pixel depth d)Persistence

Ans: Resolution

6. The distance from one pixel to the next pixel is called ...........

a)Resolution

b)Dot Pitch

c)Pixmap

d)ppi

Ans: Resolution

7. The maximum number of points that can be displayed without overlap on a CRT

a)Aspect Ratio

b)Resolution c)Brightness d)Pixel

Ans: Resolution

8. ..................... is the number of points per centimeter that can be plotted horizontally and vertically.

a)Aspect Ratio

b)Pixel Depth c)Resolution d)Dot Pitch

Ans: Resolution

9. ...................... is the ratio of horizontal points to vertical points necessary to produce equal length

lines in both direction.

a)Dot Pitch

b)Resolution c)Aspect Ratio d) Height-Width Ratio

Ans: Aspect Ratio

10. Identify the odd one out from the following

a)Frame Buffer

b)Pixmap

c)Display program

Ans: Pixmap

d)Refresh Buffer

11. The shortest distance between any two dots of the same color is called ...................

a)Resolution

b)Dot Pitch

c)Pixel Depth d)ppi

Ans: Dot Pitch

12. The standard aspect ratio for PC is .................

a) 6:5

b) 4:3 c)3:2 d)5:3

Ans: 4:3

13. In CRT, the electron intensity is adjusted using .................

a) Accelerating anode

b) Control grid

c) Electron gun

Ans: Control grid

d) Focusing anode

14. Brightness of a display is controlled by varying the voltage on the ......................

a) Focusing anode b)Connection pins

c)Control grid d)Power supply

Ans: Control grid

15. Lower persistence phosphorus is used in

a) Animation

b) Simple object

Ans: Animation

c) Complex object

d) All of these

16. Lower persistence phosphorus needs_________ refresh rate

a) Lower

b)Higher

c)Medium

d)None of these

Ans: Higher

17.. Higher persistence phosphorus needs _________ refresh rate

a) Lower

b)Higher

c)Medium

d)None of these

Ans: Lower

18. Higher persistence phosphorus is used in

a) Animation

b) Simple object

Ans: High Complex object

c) High Complex object

d) All of these

15. Memory area holding the intensity information of an image is called ..............

a)Refresh buffer

b)Font cache c)Picture definition

d)Video controller

Ans: Refresh buffer

16. Intensity representation of an image is called ......................

a)Frame buffer

b)Picture definition

c)Display list d)Brightness

Ans: Picture definition

17. The purpose of refreshing a CRT is ..........................a)To avoid flickering

c)To avoid fading of pixels d)All of the above

Ans: All of the above

18. The fly-back of electron beams from one scanline to next is known as ....................

a)Vertical Retrace b)Horizontal Retrace c)Raster scanning

d)Refreshing

Ans: Horizontal Retrace

19. The return of electron beam to top left corner of the screen after one frame is called ............

a)Horizontal fly-back

b)Vertical Fly-back

c)Scanning

d)None of the above

Ans: Vertical Fly-back

20. In raster scan display, the frame buffer holds ......................

a)Line drawing commands b)Scanning instructions c)Image Resolution

Ans: Intensity information d) Intensity information

21. In random scan display, the frame buffer holds ......................

a)Line drawing commands b)Scanning instructions c)Image Resolution

d) Intensity information

Ans: Line drawing commands

22. Identify the odd one out from the following

a)Vector display

b)Raster scan display c)Calligraphic display

Ans: Raster scan display d)Stroke-writing display

22. Interlaced refresh procedure is allowed in ..................

a) LCD

b)DVST

c)Raster scan display d)Random scan display

Ans: Raster scan display

23. Vector display is well suited for .................

a) Animation

b) Line drawing applications

Ans: Line drawing applications

c) Cartoons

d) All of the above

24. Beam penetration method is usually used in ...............................

a)LCD

b)Raster Scan display c) Random scan display d)DVST

Ans: Random scan display

a)LCD

b)Raster Scan display c) Random scan display  d)DVST

Ans : Raster Scan display

26. Identify the colors produced in beam penetration method.

a) Red, Green, Blue, White

b)Red, Orange, Yellow, Green

c)Red, Green, Blue

d) Green, Red, White, Orange

Ans : Red, Orange, Yellow, Green

27. An RGB color system with 24 bits

os storage per pixel is known as ........................

a) Color CRT

b)True-color system

c)RGB monitor d)Color- Depth

Ans: True-color system

28. Identify the features of Vector display

a)High resolution, Jagged lines, Lack in color depth

b)Smooth lines, Poor resolution, Black & White

c)High resolution, Lack in color depth, Smooth lines

d)Inexpensive, monochromatic, smooth lines

Ans: High resolution, Jagged lines, Lack in color depth

29. Identify different type of computer graphics

a) Monochrome and Color

b)CRT and Flat panel

c)Vector an Raster

d)Monitors and Hardcopy devices

Ans: Vector an Raster

30. DVST stands for ..........................

a)Digital View Storing Table

b)Direct Visual Storage Tube

c)Direct View Storage Tube

c)Digital View Storage Tube

Ans: Direct View Storage Tube

31. Refreshing is not needed in DVST because of the presence of .................

a) Primary gun

b) Flood gun c) Focusing anode

d)Control grid

Ans: Flood gun

32. In DVST, the electron beam from primary electron gun strikes on ..............

a) Phosphor screen b) Collector mesh

c)Storage mesh d) Flood gun

Ans: Storage mesh

33. The purpose of flood gun in DVST is ...........................

a) To store the picture pattern

b) To slow down the flood electrons

c) To enable color pixels

d) To focus the electron beam

Ans: To slow down the flood electrons

34. Identify the features of DVST from the following.

a) Monochromatic, Flicker free, Low resolution

b)Monochromatic, Flicker free

c) Color screens, Refresh monitors, High resolution d)Expensive, Low resolution

Ans: Monochromatic, Flicker free

35. Video devices with reduced volume, weight and power consumption are collectively known as .........a) Light weight monitors

Ans: Flat panel displays

b)Flat-panel displays

c)CRT d) Portable display

36. Pick out the odd one out

a) LED

b)LCD c) Gas Discharge tube d) Plasma Panel

Ans: LCD

37. Match the following

Part A

A. Plasma panel

B. DVST

C. LCD

D. Thin film electroluminescent

a) A-ii, B-iv, C-i, D-iii

c) A-iv, B-iii, C-i, D-ii

Ans: A-iv, B-iii, C-i, D-ii

Part B

i) Polarizer

ii) Zinc sulfide

iii) Dielectric mesh

iv)Neon gas

b) A-ii, B-iii, C-iv, D-i

d) A-i ,B-iv, C-ii, D-iii

38. ................... is responsible for accessing the frame buffer to refresh the screen.

a) Graphics package

b) Video controller

c) CPU

d) Monitor

Ans: Video controller

39. Digitizing a picture definition into a set of intensity values is known as .............

a) Digitization

b) Scan conversion

c)Refreshing d) Scanning

Ans: Scan conversion

40. ....................... will free the CPU from graphics chores.

a) Display processor

b) Monitor

c) ALU

Ans: Display processor

d)Video controller

41. Write an example for non-emissive displays

a) LED

b)LCD c) Gas Discharge tube d) Plasma Panel

Ans: LCD

42. Identify impact printer from the following

a) Drum Plotter

b)Inkjet printer c)Electrostatic printer

Ans: Dot-matrix printer

45. Write an example for non-impact printer

a) Drum plotter

b) Electrostatic printer c) Laser printer

Ans: All of the above

46. Identify the odd one out.

a) Mouse b) Keyboard

Ans: Keyboard

c) Trackball

d) Space ball

d) Dot-matrix printer

d) All of the above

47. GIF stands for ......................

a) Global Image Format

b) Graphics Interchange Format

c) Graphics Image Format d) None of the above

Ans: Graphics Interchange Format

48. The ................ simply reads each successive byte of data from the frame buffer.

a) Digital Controller

b) Data Controller

c) Display Controller d) All of above

Ans: Display Controller

49. The refresh rate below which a picture flicker is ................

a) 25

b) 30 c)35 d)60

Ans: 25

50. ........ used to regulate the flow of elections in CRT ?

a) Electron gun

b) Focusing anode

c) Control grid d) All of the above

Ans: Control grid

51. The technique used to summarize the financial, statistical, mathematical,scientific and

economic data is ?

a) Computer Art b) Image processing c) Presentation Graphics

Ans: Presentation Graphics

d)None of the above

52. Graphics and image processing technique used to produce a transformation of one object into

another is called

a) Animation

b) Morphing c) Half toning d) None of the above

Ans: Animation

53. The amount of light emitted by the phosphor coating depends on the?

a) Number of electrons striking the screen

b) Speed of electrons striking the screen

c) Distance from the cathode to the screen

d)None of above

Ans: Number of electrons striking the screen

54. Gray scale is used in ............................

a) A Monitor that have color capability

b) A Monitor that have no color capability

c) Random scan display

d) Raster scan display

Ans: A Monitor that have no color capability

55. A wireless mouse works ona) Infra blue radiation

c) X-rays

d) UV rays

56. Vector graphics is composed of

a. Pixels

b. Paths

d. None of these

Ans: Paths c. Palette`

57. Raster graphics are composed of

a.Pixels

b.Paths

c. Palette

Ans: Pixels

58. EPS image file format is used for

a) Vector graphics b) Bitmap

c) Both a & b d) None of these

Ans: Both a & b

59. TIFF (tagged image file format )are used for

a.Vector graphics

b.Bitmap

c. Both a & b

Ans: Bitmap

66.A major disadvantage of DVST in interactive computer graphics is

a) Ability to selectively erase part of an image

b) Inability to selectively erase part of image from screen

c) Inability to produce bright picture

Noned) None

Ans: Inability to selectively erase part of image from screen

67. Which of the following allow for 8 mirror images?

a) Parabola

b)Ellipse

c)Hyperbola

d) Circle

Ans: Circle

68. The simplest output primitive is .............

a) Straight line b) Straight line segment

Ans: Point

c) Point

d)Circle

69. A bitmap is .............. bit(s) per pixels.

a) 0

b)1

c)2

d)4

Ans: 1

70. The intensity of a grayscale pixel is expressed within a given range between a minimum and a maximum

a) 1 and 2

b) 2 and 1

c) 0 and 1

d)0 and 2

Ans: 0 and 1

71. Each pixel has ________basic color components

a.Two or three

b.One or two

b.Three or four

d.None of these

Ans: Three or four

73. The basic geometric structures that describes a scene on display is called .................

a) Attributes

b) Output primitive

c) Lines

d) Curves

Ans: Output primitive

74. ..................... controls the basic display properties of output primitives.

a) Attribute parameter b) setpixel

c) getpixel

d) None of the above

Ans: Attribute parameter

75. To set line width attributes in a PHIGS package, ................... function is used.

a) setLineThickness(lw)

b)setLineWidth(lw)

c) setLineWidthScaleFactor(lw)

d)setPolylineWidth(lw)

Ans: setLineWidthScaleFactor(lw)

76. Identify the values for fill-style parameter from the following

a) Hollow

b)Hatch

c) Pattern

d)All of the above

Ans: All of the above

77. ...................... function is used to set the basic fill style.

a) setFillStyle(fs)

b) setFillStyleIndex(fs)

c) setInteriorStyle(fs)

d)FillType(ft)

Ans: setInteriorStyle(fs)

78. ..................... is defined as the distance between the baseline and cap line of the character body.

a) Character Size b) Character Height

c) Character Width

d)Character Length

Ans: Character Height

80. ............... function is used to change the size of a character without changing the height:width ratio.

a)setTextSize(ts) b)setCharacterHeight(ch)

c)setCharacterSize(cs) d)setTextHeight(th)

Ans: setCharacterHeight(ch)

81. .................. will define a group of attribute values of each primitive to be used on a monitor

a) Primitive table b)Bundle table c) Attribute table

d) None of the above

Ans: None of the above

82. ............. function is used to set how text is to be positioned with respect to the start coordinates

a) setTextAlignment(h,v) b)setTextPrecision(tp) c)setTextPosition(h,v) d)setText(ts)

Ans: setTextAlignment(h,v)

83. ................ is used to check the current status of each attributes

a) setpixel

b)getpixel

c)inquiry function

d)status function

Ans: Inquiry function

84. The basic transformations include

a) Translation

b)Rotation

c)Scaling

d) All of the above

Ans: All of the above

85. The transformation in which an object is moved in a minimum distance path from one position to

another is called

a) Rotation b) Replacement

c) Translation d) Scaling

Ans: Translation

86. The translation distances (dx, dy) is called as

a) Translation vector

b) Shift vector c) Both a and b

d) Neither a nor b

Ans: Both a and b

87. The two-dimensional translation equation in the matrix form is

a) P’=P+T

b) P’=P-T

c) P’=P*T

d) P’=p

88. The transformation in which an object is moved from one position to another in circular path around

a specified pivot point is calleda ) Rotation

b) Shearing

c) Translation d) Scaling

Ans: Rotation

89. The transformation in which the dimension of an object are changed relative to a specified fixed point

is called

a ) Rotation

b) Reflection

c) Translation d) Scaling

Ans: Scaling

90. The transformation that produces a parallel mirror image of an object are called

a ) Rotation

b) Reflection c) Translation d) Scaling

Ans: Reflection

99. Which of the following is not a rigid body transformation?

a) Translation

b) Rotation

c) Shearing

d) Reflection

Ans: Shearing

101. Two consecutive translation transformation t1 and t2 are

c) Subtractive d) none of above

102. Two consecutive rotation transformation r1 and r2 are

c) Subtractive d) none of above

103. Two consecutive scaling transformation s1 and s2 are

b) Multiplicative

c) Subtractive d) none of above

Ans: Multiplicative

104. The process of mapping a world window in world coordinate system to viewport are called

a) Transformation viewing

b) Viewport

c) Clipping window

d) Screen coordinate system

Ans: Transformation viewing

105. The process of extracting a portion of a database or a picture inside or outside a specified region are

called

a) Transformation b) Projection c) Clipping

d) Mapping

Ans: Clipping

106. The rectangle portion of the interface window that defines where the image will actually appear are

called

a) Transformation viewing b) View port c) Clipping window

d) Screen coordinate system

Ans: View port

107. The phenomenon of having a continuous glow of a beam on the screen even after it is removed is

called as ?

a) Fluorescence

b) Persistence c) Phosphorescence

d) Incandescence

Ans: Phosphorescence

191. In ........................ mode the program requests input and suspends processing until input is

a) Request

b) Event

c) Sample

d) Constraint

Ans: Request

198. ........................ is an adaptation of binary tree representing the 2-D point data

199. .................... quad tree stores line rather than point.