Quiznetik

Computer Graphics | Set 5

1. the desired characteristic of line is/are…….

Correct : D. all of above

2. the desired characteristic of line is/are…….

Correct : D. all of above

3. the horizontal and vertical lines drawn by line drawing algorithm are……

Correct : A. straight

4. A line drawn in the background color is

Correct : B. invisible

5. In Bresenham's algorithm, while generating a circle , it is easy to generate?

Correct : A. one octant first and other by successive reflection

6. Why a circle drawn on the screen appears to be elliptical  ?

Correct : A. it is due to the aspect ratio of monitor

7. In bresenhan's algorithm error term is initialized to ?

Correct : A. 0

8. The anti - aliasing technique which allows shift of 1/4,1/2 and 3/4 of a pixel diameter enabling a closer path of a line is ?

Correct : A. pixel phasing

9. A technique by which the vertical and /or horizontal scan frequency of video signal can be changed for different purpose and applications is called

Correct : A. scan conversion

10. A pixel may be defined as

Correct : A. ?? smallest size object

11. A position in plane known as

Correct : B. point

12. A line can be represented by

Correct : B. two points

13. A vector can be defined as

Correct : B. difference b/w two point position

14. Bresanham circle algorithm uses the approach of

Correct : A. midpoint

15. The side effect of scan conversion are

Correct : A. aliasing

16. The process of reducing aliasing is called

Correct : B. anti aliasing

17. Two basic technique for anti aliasing in ray tracing algorithm are

Correct : B. adaptive sampling and super sampling

18. Pixel mask means

Correct : C. a string containing 1 and 0

19. A heavy line on a video monitor could be displayed as

Correct : B. adjacent parallel lines

20. To set the line-width attribute the following command is used.

Correct : D. setlinewidthscalefactor (lw)

21. The parameter to “setLineWidthScaleFactor (lw) “function specifies?

Correct : B. relative width of the line

22. Higher persistence phosphorus needs _________ refresh rate

Correct : A. lower

23. Higher persistence phosphorus is used in

Correct : C. higher complex object

24. Phosphorus are of various types depending on

Correct : C. both a & b

25. if one octant of the circle is generated, to complete the generation of full circle, how many reflections are required?

Correct : D. 8

26. the best line drawing algorithm among all possible line drawing algorithm is………….

Correct : C. bresenham\s algorithm

27. if any two point Pi(xi, yi) is considered, then it lies on the line on the line segment y = mx+b if………

Correct : D. all of above

28. if a line segment between (x1, y1) and (x2, y2) is represented in parametric form with a parameter u, then the expression for can be given as……..

Correct : B. x= x1+(x2-x1)u

29. a vector has ……….

Correct : D. a and c

30. The problem of aliasing are

Correct : D. all of these

31. The technique to minimizing aliasing are

Correct : D. all of these

32. Lower persistence phosphorus is used in

Correct : A. animation

33. Lower persistence phosphorus needs_________ refresh rate

Correct : B. higher

34. the equation of a line, y= mx+b, b is …….

Correct : B. slope of a line the height at which the line crosses the y-axis.

35. the basic geometric structures provided by graphics primitive packages are refered to as

Correct : D. output primitives

36. when a line is represented by a equation, y=mx+b and rx+sy+t=0, m=…….

Correct : A. (-r/s)

37. when a line is represented by a equation, y=mx+b and rx+sy+t=0, b=…….

Correct : B. (-t/s)

38. if two lines are parallel, they have …….slope.

Correct : B. same

39. if two lines are represented by equations y=m1x+b1 and y=m2x+b2, their point of intersection is given by………

Correct : D. [(b2-b1/m1-m2), (b2m1-b1m2)/(m1-m2)]

40. when we say a line, it……

Correct : D. extends forever both forward and backward

41. In computer graphics, pictures or graphics objects are presented as a collection of discrete picture element called______.

Correct : B. pixels

42. . _______is the smallest addressable screen element.

Correct : C. pixels

43. We can control ____of the pixels which compose the screen.

Correct : A. intensity

44. We can control ____of the pixels which compose the screen.

Correct : A. colour

45. Each pixel on the graphics display represents______.

Correct : D. a region which theoretically can contain infinite points

46. . A point (42,38) can be displayed on a screen by a pixel.

Correct : A. (4,3)

47. The process of determining the appropriate pixel for representing, picture or graphics objects is known as___

Correct : B. rasterization

48. The process representing continuous picture or graphics objects as a collection of descrete pixels is called____.

Correct : A. scan conversion

49. The computer graphics allows____ on pictures before displaying it.

Correct : D. all of above

50. Graphics devices include_____.

Correct : C. a and b

51. Computer graphics allows_____.

Correct : D. all of above

52. Computer graphics allows______.

Correct : D. all of above

53. Computer graphics allows_____.

Correct : D. all of above

54. The Hardware components of conceptual framework for interactive graphics is/are________.

Correct : C. a and b

55. The display devices are_____.

Correct : B. output

56. CRT stands for____.

Correct : A. cathode ray tube

57. A CRT is an evacuated _________ tube.

Correct : B. glass

58. An____________ gun at the rear of the CRT produces a beam of electrons.

Correct : B. electron

59. The deflection system of the CRT consistsof___________deflection plates.

Correct : C. a and b

60. The techique(s) used for producing image on the CRT is/are__________ .

Correct : C. both a and b

61. Vector scan technique is also called _________.

Correct : B. random scan

62. In vector scan display, buffer memory used is also called _________.

Correct : B. refresh buffer

63. In vector scan display, the phosphor is to be refreshed at least ________ times per second to avoid flicker.

Correct : C. 30

64. The techique(s) used for producing image on the CRT is/are__________.

Correct : C. both a and b

65. In raster scan display,the display image is stored in the form of _________ in the refresh buffer.

Correct : C. 1s and 0s

66. In raster scan CRT, the beam is swept back and forth from _______ across the screen.

Correct : A. left to right

67. In raster Scan CRT, when a beam is moved from the left to the right,it s ____ and it is _____ when it is moved from the right to the left.

Correct : A. on,off

68. In raster scan display, the screen image repeatedly scanned, this process is called _______.

Correct : B. refreshig of screen

69. On a black and white system with one bit per pixel , the frame buffer is called a__________.

Correct : A. bitmap

70. The cost of vector scan display is___________ cost of raster scan dispay.

Correct : C. more than

71. For ____________ display , scan conversion hardware is required.

Correct : C. raster scan

72. Aspect ratio is the ratio of ________ to prodce equal length lines in both direction on the screen

Correct : A. vertical points to horizontal points

73. Display file can be implemented using __________ data structure.

Correct : D. all of the above

74. The process of digitizing a picture definition given in an application program into a set of pixel-intensity Values is called ____________.

Correct : D. scan-conversion

75. The size of frame buffer(video memory )depends on_____________.

Correct : C. both (b) and(c)

76. A pixel of black_white image or graphics object takes _________ space in memory.

Correct : C. 1 nibble

77. The resolution of an image is __________.

Correct : A. number of pixels per unit area

78. The path the electron beam takes at the end of each refresh cycle is called______.

Correct : B. vertical retrace

79. The path the electron beam takes when returning to the left side of the CRTscreen is called_____.

Correct : A. horizontal retrace

80. Frame buffer is used to store_____.

Correct : B. intencities of pixels

81. The clearity of a displayed image depends on the______.

Correct : A. resolution

82. Random scan monitor can also referred to as______.

Correct : A. vector displays

83. Which facility is provided by computer graphics to change the shape colour or other properties of objects begin viewed.

Correct : B. update dynamics

84. and start point is (20, 20), then slope m =?

Correct : B. 0.8

85. is a point on a circle that has center at the origin. Which of the following points are also on circle ?

Correct : D. all of above

86. and (5,3) is to be drawn, using DDA algorithm. Find the value of x and y increments?

Correct : C. x-increments = 1; y-increments =0.5

87. A closed polyline is called a _________.

Correct : B. polygon

88. __________ is a method for testing a pixel inside of a polygon.

Correct : C. a and b

89. The seed fill algorithm for filling polygon is classified as ________ fill algorithm and _______ fill algorithm.

Correct : A. flood, boundry

90. The putpixel function draws the pixel specified_______.

Correct : B. colour

91. Mapping the world co-ordinates into physical device co-ordinates is called__________.

Correct : D. viewing transformation

92. An area on a physical device to which a window is mapped is called a __________.

Correct : D. viewport

93. The line is said to be interior to the clipping window if ___________point(s) is/ are interior to the window.

Correct : C. both end

94. The transformation which maps the viewing co-ordinates to normalized device co-ordinte is called _______.

Correct : C. normalization transformation

95. If both end points of a line are exterior to the clipping window,__________.

Correct : B. the line is not necessarily completely exterior to the clipping window

96. If both end points of a line are completely to the left of clipping window,________.

Correct : C. the line is completely exterior to the clipping window

97. In Cohen-sutherland subdivision line clipping algorithm, bit 1 in region code is set if _____.

Correct : A. end point of line is to the left of the window

98. In Cohen-sutherland subdivision line clipping algorithm, bit 3 in region code is set if _____.

Correct : C. end point of line is to the below of the window

99. The complex graphics operations are_______.

Correct : C. clipping

100. The end point of polygon are called as__________.

Correct : B. vertices