Quiznetik

Computer Graphics | Set 4

1. The projection that can be viewed as the projection that has a centre of projection at a finite distance from the plane of projection are called ________

Correct : B. perspective projection

2. The perspective projection is more practical because the distant objects appear _________.

Correct : A. smaller

3. The equation of scaling transformation will be ___________

Correct : B. x1=x.sx,y1=y.sy,z1=z.sz

4. The equation of translation transformation will be ______________.

Correct : A. x1=x+tx,y1=y+ty,z1=z+tz

5. The equation for describing surface of 3D plane are ______________.

Correct : A. ax+ by+ cz+ d= 0

6. The object refers to the 3D representation through linear, circular or some other representation are called ___________

Correct : B. sweep representation

7. The distance of a line from the projection plane determines ___________

Correct : A. its size on projection plane

8. The further the line from the projection plane, _______its image on the projection plane

Correct : A. smaller

9. When two molecules move apart, which effect on molecular shapes_________.

Correct : D. all of these

10. The sweep representation of an object refers to the _____________

Correct : B. 3d representation

11. Translation is ___________ transformation in nature

Correct : C. rigid body

12. To translate a circle we add translation distances to __________ of circle.

Correct : C. center

13. Scaling factor with absolute value less than one moves object ________ to coordinate origin.

Correct : B. closer

14. Scaling factor with absolute value ________ moves object fartrher from coordinate origin

Correct : D. none of above

15. _____________ is an example of affine transformation.

Correct : D. all of above

16. We can express 2D transformations as _________ matrix operators.

Correct : C. 3 by 3

17. We can express 3D transformations as _________ matrix operators

Correct : D. 4 by 4

18. Reflections are equivalent to _________

Correct : A. 180 degree rotation

19. The subcategories of orthographic projection are_.

Correct : C. isometric,dimetric,trimetric

20. In perspective projection eye of the viewer is placed at the _.

Correct : D. center of the projection

21. In _ the projection, lines are perpendicular to the projection plane.

Correct : A. orthographic projection

22. Clockwise rotaton of 2D object is similar to clockwise rotation of _ in 3D

Correct : C. about zaxis

23. In case of 3 clipping _ is the additional thing as compared to 2d clipping.

Correct : B. back and front clipping

24. _projection ,all three principal axis are equally shortened so that realtive propostion are maintained.

Correct : A. isometric

25. In left handed system (LHS),the Zaxis_.

Correct : B. points away 4m the viewer

26. In righthanded system(RHS),the Zaxis_.

Correct : A. points towards the viewer

27. If the projection plane intersect exactly 2 principal axis then it is _.

Correct : B. two point prespective projrction

28. A 45 degree rotation about y axis will move a line on x axis to __

Correct : A. xz plane

29. Which of the following is an example of orthographic projection

Correct : C. dimetric

30. The projection line are normal to the view plane, then such type of projection is called as __

Correct : C. orthographic projection

31. Maximum no of vanishing points that can appear in a case of 3D object are_

Correct : C. 3

32. Which of the following is not a type of orthographic projection

Correct : D. both b and c

33. In case of 3d clipping end point of line segment is assigned with __ bit.

Correct : C. 6

34. __ projection are making 90 degree angle with view plane.

Correct : A. isometric

35. Dimetric projection are making _ degree angle with view plane

Correct : B. 90

36. which of the following is a 3d viewing parameter?

Correct : B. view reference point

37. In__ system +ve z axis points towards the viewer

Correct : A. right hand system

38. Which of the following parameter is newly added in 3D as compared to 2D.

Correct : C. depth

39. In 3D scaling transformation which field is addition as compared to 2D

Correct : C. sz

40. Any 3D point is represented in matrix for with dimensions are __

Correct : A. 1*3

41. In case of 3D rotation, __angle produce counterclockwise rotation

Correct : A. positive

42. In __ projection are parallel to each other

Correct : D. both b and c

43. In translaion process, the translation distance pair(tx,ty)is called a-----

Correct : D. (a) and (b)

44. If a polygon with co-ordinates A(2,5),B(7,10),C(10,2) is translated 3 units in x-direction & 4 units in y-direction then the resultant co-ord.of polygon are-----

Correct : A. a\(5,9),b\(10,14),c\(13,6)

45. If a polygon with co-ordinates A(2,5),B(7,10),C(10,2) is scaled by 2 units in x-direction & 2 units in y-direction then the resultant co-ord.of polygon becomes A'-----,B'-----,C'-----

Correct : A. (2,5),(7,10)(10,2)

46. Three axes x,y,z are at -----angles to each other

Correct : A. 90??

47. A vector perpendicular to a plane is called-----

Correct : B. normal vector

48. The equation of plane is-----

Correct : B. ax+by+cz+d=0

49. In 3D viewing mismatch between 3D objects and 2D display is compensated by introducing------

Correct : A. viewing

50. In 3D viewing----transformation transforms the projection co ordinates into the device co ordinates.

Correct : B. projection

51. view plane normal vector is perpendicular to----

Correct : C. workstation

52. 2 basic ways of projecting objects onto viewplane are --- and---

Correct : C. view

53. A ---- projection preserves relative proportion of object but does not produce the realistic view

Correct : C. parallel, perspective

54. A---- projection produces realistic view but does not preserve relative proportion

Correct : B. parallel

55. In perspective projection line of projection converge at a single point called -----

Correct : C. perspective

56. In perspective projection eye of the viewer is placed at the _.

Correct : C. translation

57. In _ the projection, lines are perpendicular to the projection plane.

Correct : D. center of the projection

58. clockwise rotaton of 2D object is similar to clockwise rotation of _ in 3D

Correct : A. orthographic projection

59. In _ transformation,we get Z(new)=Z(old).

Correct : C. about zaxis

60. In case of 3 clipping _ is the additional thing as compared to 2d clipping.

Correct : B. false

61. if two points used to specify a line are (x1, y1) and (x2, y2), then the equation of line is given as………..

Correct : B. y-y1/x-x1=y2-y1/x2-x1

62. the equation of a line in slope intercept form is given as……

Correct : C. y=mx+b

63. ……… is the fundamental element of the picture representation.

Correct : C. point

64. minimum…….. Points are required to represent a line

Correct : A. two

65. ………. and ……... are the basic output primitives.

Correct : A. points, line segments

66. points P1(3.2, 7.8) and P2(3.7, 7.1) are both represented by pixel……..

Correct : C. (3,7)

67. pixel phasing is an anti-aliasing technique based on………

Correct : A. hardware

68. pixel phasing is a technique for……..

Correct : B. anti-aliasing

69. a line connecting the points (1,1) and (5,3) is to be drawn, using the DDA algorithm. Find the values of x and y increments.

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

70. Which of the following algorithm can be used for circle generation?

Correct : C. both a and b

71. aliasing means……..

Correct : C. staircase effect

72. slope of the line joining the points(1,2) and (3,4) is…….

Correct : B. 1

73. a line segment……………

Correct : C. ends at two points

74. the multiplication of a vector and the reciprocal of its length is equal to ……..

Correct : C. one

75. the process of turning on the pixels for a line segment is called…….

Correct : D. a or b

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

Correct : C. constant

77. the width of 45 degree line drawn by line drawing algorithm is………….

Correct : B. not constant

78. the brightness of the line is dependent on the ……of the line.

Correct : A. orientation

79. the horizontal and vertical lines appear …….the 45 degree line.

Correct : C. brighter than

80. DDA stands for ………….

Correct : C. digital differential analyzer

81. the slope of a straight line is given as……..

Correct : A. m= (??y / ??x)

82. the slope of a straight line is given as……..

Correct : B. m= y2-y1/x2-x1

83. in DDA line drawing algorithm, Δx or Δy, whichever is ………, is chosen as one raster unit.

Correct : D. larger

84. sign function makes the DDA line drawing algorithm work in ………….quadrants.

Correct : D. all of above

85. if a line is to be drawn from (0,0) to (4,6) using DDA line drawing algorithm, the third point to be plotted is …….

Correct : A. (1,2)

86. when a line with end-points (20,10) and (30,18) is to be drawn using DDA line drawing algrithm, ………is chosen as one raster unit.

Correct : A. ??x

87. when a line is to be drawn from (0,0) to (6,6) using DDA line drawing algorithm, the initial values for x and y are……..

Correct : B. (-0.5), (-0.5)

88. the DDA line drawing algorithm is …….. Dependent.

Correct : A. orientation

89. the end point accuracy of DDA line drawing algorithm is ……..

Correct : D. poor

90. floating point algorithm in DDA algorithm is……..

Correct : B. time consuming

91. DDA line drawing algorithm for calculating pixel position is ……… the direct use of equation y = mx + b

Correct : B. faster than

92. alorithm those use the outputs of the previous iteration, in the computation of outputs in the current iteration are called

Correct : B. incremental

93. the advantage of Bresenham's algorithm over conventional DDA algorithm is …….?

Correct : B. use of integer addition and subtraction

94. The basic attributes of a straight line segment are

Correct : D. all of these

95. A dashed line could be displayed by generating_________.

Correct : A. inter dash spacing

96. A dotted line can be displayed by generating

Correct : C. very short dashes with spacing equal to and greater than dash size

97. Which of the following is not a line-type?

Correct : B. dark line

98. In an application program, to set line-type attributes the following statement is used.

Correct : B. setlinetype(lt)

99. The algorithm which displays line-type attributes by plotting pixel spans is

Correct : A. raster line algorithm

100. the line drawn using line drawing algorithm should be displayed with ……brightness.

Correct : B. constant