PICT 20122016 Q1 A PIXEL MAY BE DEFINED AS

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Q1

@PICT 2012-2016

Q1. A pixel may be defined as

Smallest size object
Larger size object
Medium size object
None of these

Answer: a

Q2. A line can be represented by

One point
Two points
Three points
Four points

Answer: b

Q3. The function of scan line polygon fill algorithm are_________________

a) Find intersection point of the boundary of polygon and scan line

b) Find intersection point of the boundary of polygon and point

c) Both a & b

d) None of these

Answer: a

Q4. Bresanham circle algorithm uses the approach of

a) Midpoin

b) Point

c) Line

d) None of these

Answer: a

Q5. The side effect of scan conversion are

a) Aliasing

b) Anti aliasing

c) Both a & b

d) None of these

Answer: a

Q6. The process of reducing aliasing is called

a) Resolution

b) Anti aliasing

c) Sampling

d) None of these

Answer: b

Q7. Two basic technique for anti aliasing in ray tracing algorithm are

a) Pixel sampling and super sampling

b) Adaptive sampling and super sampling

c) Pixel sampling and super sampling

d) None of these

Answer: b

Q8. The problem of aliasing are

a) Staircase

b) Unequal brightness

c) Picket fence problem

d) All of these

Answer: d

Q9. The technique to minimizing aliasing are

a) Increased no of resolution

b) Modify pixel intensities

c) Super sampling

d) All of these

Answer: d

Q10. To generate the characters, which are required

Hardware
Software
Both a & b
None of these

Answer: c

Q11. The method which uses array of dots for generating a character is called

Stoke method
Bitmap method
Star bust method
None of these

Answer: b

Q12. What is name of temporary memory where the graphics data is stored to be displayed on screen

RAM
ROM
Frame buffer
None

Answer: c

Q13. The division of the computer screen into rows and columns that define the no. of pixels to display a picture is called

Persistence
Resolution
Encapsulated post script
None

Answer: b

Q14. Two types of coordinates are

a) Positive and negative coordinates

b) Absolute and relative coordinates

c) Both a & b

d) None

Answer: b

Q15. The Cartesian slope-intercept equation for a straight line is

a) y = m.x + b
b) y = b.x + m
c) y = x.x + m
d) y = b + m.m

Answer: a

Q16. On raster system, lines are plotted with
a) Lines
b) Dots
c) Pixels
d) None

Answer: c

Q17. Expansion of line DDA algorithm is

a) Digital difference analyzer
b) Direct differential analyzer
c) Digital differential analyzer
d) Data differential analyzer

Answer: c

Q18. Which algorithm is a faster method for calculating pixel positions?

a) Bresenham’s line algorithm
b) Parallel line algorithm
c) Mid-point algorithm
d) DDA line algorithm

Answer: a

Q19. The disadvantage of line DDA is

a) Time consuming
b) Faster
c) Neither a nor b
d) None

Answer: a

Q20. An accurate and efficient raster line-generating algorithm is

a) DDA algorithm
b) Mid-point algorithm
c) Parallel line algorithm
d) Bresenham’s line algorithm

Answer: d

Q21. In Bresenham’s line algorithm, if the distances d1 < d2 then decision parameter Pk is______

a) Positive
b) Equal
c) Negative
d) Option a or c

Answer: c

Q22. Which is the best line algorithm to balance the processing load among the processors?

a) Parallel line algorithm
b) DDA line algorithm
c) Bresenham’s line algorithm
d) Position Bresenham’s line algorithm

Answer: a

Q23. The algorithm which uses multiple processors to calculate pixel positions is

a) Midpoint algorithm
b) Parallel line algorithm
c) Bresenham’s line algorithm
d) All the above

Answer: b

Q24. Area-sampling is also known as

a) Pre-filtering
b) Pixel phasing
c) Post-filtering
d) Anti-aliasing

Answer: a

Q25. Raster objects can also be anti-aliased by shifting the display location of pixel areas is known as

a) Super-sampling
b) Pixel shaping
c) Pixel phasing
d) Any of these

Answer: c

Q26. An array of values specifying the relative importance of sub-pixel is referred as________ of sub-pixel weights.

a) Sub-mask
b) Mask
c) Pixel phasing
d) Pixel weighting

Answer: c

Q27. The technique that is more accurate method for anti-aliasing lines is

a) Filtering
b) Area-sampling
c) Super-sampling
d) None

Answer: a

Q28. Another method for determining the percentage of pixel area within a boundary is

a) Mid-print algorithm
b) Mid-point algorithm
c) Pixel intensity
d) By using inquiry functions

Answer: b

Q29. 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 ?

a) Pixel phasing

b) Filtering

c) Intensity compensation

d) Sampling technique

Answer: a

Q30. Raster scan systems display a picture from a definition in a

a) Display file program

b) Frame buffer

c) Display controller

d) None of the above

Answer: b

Q31. A line connecting the points (1, 1) and (5, 3) is to be drawn, using the DDA algorithm. Find the value of x and y increments.

a) x-increment =1 ; y-increment=1

b) x-increment =0.5 ; y-increment=1

c) x-increment =1 ; y-increment=0.5

d)none of these

Q32. For a black and-white raster system, on the other hand, a point is plotted by setting the bit value corresponding to a specified screen position within the frame buffer to ----------------.

a) 1

b) 0

c) 0.5

d) None of above

Answer: a

Q33. A computed line position of (10.48, 20.51), for example, would be converted to pixel position ________________.

a) (10, 21)

b) (11, 20)

c) (11, 21)

d) (10, 20)

Answer: a

Q34. Rounding of coordinate values to integers causes lines to be displayed with a _______________ appearance.

a) Stair-step

b) Distorted

c) Curve

d) None of above

Answer: a

Q35. Scan lines are numbered consecutively from 0, starting at the bottom of the screen; and pixel columns are numbered from 0,___________ across each scan line.

a) left to right

b) right to left

c) top to bottom

d) bottom to top

Answer: a

Q36. Scan lines are numbered consecutively from 0, starting at the_________of the screen; and pixel columns are numbered from 0, left to right across each scan line.

a) bottom

b) left

c) right

d) top

Answer: a

Q37. The Cartesian slope-intercept equation for a straight line is

a) y = m.x+b

b) y = x + b

c) y = x + m.b

d) y = x + 1

Answer: a

Q38. Given that the two endpoints of the segment are specified at positions (x_1,y₁) and (x₂, y₂), value for the slope m is calculated as:

a) [(y₂-y₁) / (x₂-x₁)]

b) [(x₂-x₁) / (y₂-y₁)]

c) [(x₂-y₂) / (x₁-y₁)]

d) None of above

Answer:

Q39. Given that the two endpoints of the segment are specified at positions (x₁, y₁) and (x₂, y₂), value for y intercept b is calculated as:

a) b = y₁ – m.x1

b) b = x₁ – m.y1

c) b = y₁ – x1 / 2

d) None of above

Answer: a

Q40. For lines with m = 1 and Δx = Δy ; the horizontal and vertical deflections voltages are _______.

a) equal

b) unequal

c) low

d) high

Answer: a

Q41. For lines with m = 1 and ___________; the horizontal and vertical deflections voltages are equal.

a) Δx = Δy

b) Δx < Δy

c) Δx > Δy

d) None of above

Answer: a

Q42. An accurate and efficient raster line-generating algorithm, developed by Bresenham, scan converts lines using only incremental___________ calculations that can be adapted to display circles

a) fractional

b) integer

c) complex

d) none of above

Answer: b

Q43. As in Bresenham's line algorithm, the midpoint method calculates pixel positions along the circumference of a circle using__________ additions and subtractions

a) fractional

b) integer

c) complex

d) none of above

Answer: b

Q44. Scan lines are numbered consecutively from 0, starting at the bottom of the screen; and_________________ are numbered from 0, left to right across each scan line.

a) pixel columns

b) pixelrows

c) lines

d) None of above

Answer: a

Q45. . A computed line position of (20.48, 34.51), for example, would be converted to pixel position ________________.

a) (20, 34)

b) (21, 34)

c) (34, 21)

d) (20, 35)

Answer: d

46) For a thick line width of a line has value __________________

a.1

b.2

c.none

d.gerater than one

ans.d

47) For a gentle slope line m value is _____________

a)less than one

b)greater than one

c)any value

d) None of above

Ans.a

48) For a gentle slope line value of x coordinate increase by ________ where as value of y coordinate increases by ________

a. 1,m

b.m,1

c.1,1

d. None of above

Ans.a

49)For a sharp slope line value of x coordinate increase by ________ where as value of y coordinate increases by ________

a. 1/m, m

b.1/m, 1

c.1,1

d. None of above

Ans.a

50) For a sharp slope line m value is _____________

a)less than one

b)greater than one

c)any value

d) None of above

Ans.b

51) DDA stands for _____________________

a. Digital differential Arithmetic

b. Digital differential Analysis

c. Digital differential Analyser

D.all of above

Ans.b

52) ____________ is example of Incremental method

a. Midpoint circle generation

b. Bresenham’s circle generation

c. DDA

d. All of above

Ans.c

53) _____________ is decision parameter in DDA Line drawing algorithm

a.Error function

b.midpoint of two point

c.sum variable

d.slope of a line

Ans.d

54) _____________ is decision parameter in Bresenham’s Line drawing algorithm

a.Error function

b.midpoint of two point

c.sum variable

d.slope of a line

Ans.a

55) _____________ is decision parameter in Midpoint circle Generation algorithm

a. Error function

b. midpoint of two point

c. sum variable

d. slope of a line

Ans. b

56) _____________ is decision parameter in Bresenham circle generation algorithm

a.Error function

b.midpoint of two point

c.sum variable

d.slope of a line

Ans.c

57)_______________ are round off functions used in DDA

a.Ceil(),Floor()

b)rnd()

c)abs()

d)fact()

Ans.a

58) ______________ algorithm supports floating point operations

a)Bresenham’s

b) DDA

c) scan line

d) All of above

Ans.b

59) ______________ algorithm supports floating point operations

a)Bresenham’s

b) DDA

c) scan line

d) All of above

Ans. A

60) There are _________________ character generation method

a.1

b.2

c.3

d.4

Ans. _c

61) ______________ is not a character generation method

a)Stroke Method

b)Scan line

c)Bit map

d)star bust method

Ans. b

62) ______________ uses 24 bit star bust pattern

a)Stroke Method

b)Scan line

c)Bit map

d)star bust method

Ans .d

63) The process of Turning on pixels for a line segment is called ______________

a. scalar Generation

b. Vector Generation

c)Transformation

d)Scaling

Ans. b

64)Gentle slope lines are closer to ___________ l lines

a)Horizontal

b)vertical

c)parallel

d)All of above

Ans. a

65)___________ slope lines are closer to vertical lines l lines

a)Gentle

b)Sharp

c) random

d) All of above

Ans. a

66) A line with start point (0,0) and endpoint (4,6) is __________ line

a) Gentle

b) sharp

c) slope value one

d) All of above

Ans. b

67) A line with start point(0,0) and (6,4) is _______________ line

a)sharp

b)Gentle

c) slope value one

d)All of above

Ans. b

There are _____________ character generation methods

Ans. c

69) You can’t draw a character with rounded shape in _____________ method

a).Bitmap method

b)Stroke method

c) Starbust method

d) all of above

Ans.b

Q70) __________ is another name for Bitmap method

Dot marix
Stroke method
Star burst
None of above

Ans. a

Q71)Starbust method requires ______________ memory

less
More
Huge
Very Less

Ans.b

Q72)In starbust method each character has ____________ bit code

a)8

b) 16

c)24

d)32

Ans. c

Q73) In _____________ line appear as like a stair case

antialiasing
Aliasing
Sampling
Supersampling

Ans.b

Q74) Aliasing generally appears with _________________ resolution screen

High
Very High
Low
Moderate

Ans.c

Q75) In antialiasing we ___________________ intensities of pixel

adjust
increarse
Decrease
None of above

Ans. a

Q76) Aliasing effect can be reduced by _____________ resolution

decreasing
Multiplying
Increasing
All of above

Ans. c

Q77)Increasing resolution is

Cheap
Costly
Can’t say
Not possible

Ans.b

Q78)___________ is process of adjusting intensities of a pixel

a) Aliasing

b) Antialiasing

c) postfiltering

d) sampling

Ans.b

Q79)Process of shifting display location of pixel areas is called as _________________

Weighted area sampling
Filtering
Supersampling
Pixel Phasing

Ans. d

Q80) Circle drawing uses _____________ symmetry

1-way
2-way
$-way
8-way

Ans. d

Q81) In Bresnham’s circle generation _________________ is decision variable

a)mid-point

b)sum-variable

c) slope

d)error function

Ans b

Q 82) For a Bresenham’s line drawing initial value of G is given as

a) G=0

b) G=2*dy-dx

c)g=x/y

d) g=dy/dx

Ans b

Q83)In bresenham’s line drawing if(G>0) condition is true g will be updated as

a)G=0

b)G=G+(2*dy-2*dx)

c)G=G+2*dy

d) G=G*G

Ans.b

Q84)In bresenham’s line drawing if(G>0) condition is false g will be updated as

a)G=0

b)G=G+(2*dy-2*dx)

c)G=G+2*dy

d) G=G*G

Ans.c

Q85) For a circle drawing algorithm initial values of X & Y coordinates are _________

a)0,r

b)r,0

c)r,r

d)1,1

Ans a

Q86) For a gentle slope lines value of Xinc any Yinc are _____________

a)1,m

b)m,1

c)1,1

d)m,m

Ans.a

Q87) For a sharp slope lines value of Xinc any Yinc are _____________

a)1,m

b)1/m,1

c)1,1

d)m,m

Ans.b

Q88) For line with slope value equals to one value of Xinc any Yinc are _____________

a)1,m

b)m,1

c)1,1

d)m,m

Ans.c

Q89) DDA is ____________ efficient in nature

a)Less

b)more

c) can’t say

d) None of above

Ans. a

Q90) Bresenham’s is ____________ efficient in nature

a)Less

b)more

c) can’t say

d) None of above

Ans. b

Q91) A line with start & endpoints (1,1)(5,3) respectively endpoints actual intermediate pixel positions are _____________

a)(2,0.5)(3,1.5)(4,2.5)

b)(2,1.5),(3,2)(4,2.5)

c)(2,3)(3,3)(4,3)

d)None of above

Ans b

Q92) A line with start & endpoints (1,1)(3,5)respectively endpoints actual intermediate pixel positions are _____________

a)(2,0.5)(3,1.5)(4,2.5)

b)(2,1.5),(3,2)(4,2.5)

c)((1.5,2),(2,3)(2.5,4)

d)None of above

Ans c

Q93) A line has by default width value __________________

Ans.a

Q94) In ________________ method it is possible to perform scaling operation on character

a)Starbust

b)Dotmatric

c)Stroke

d)None of above

Ans.c

Q95)________________ is traditional method of circle drawing

a)Midpoint

b)Bresenham’s

c) Trignometric method

d)All of above

Ans. c

Q96)________________ is traditional method of circle drawing

a)Polynomial

b)Bresenham’s

c) DDA

d)All of above

Ans. a

Q97)In midpoint circle generation value of initial decision parameter is given by _______

a)p=r

b)p=1-r

c)p=p+r

d)p=p*r

Ans. b

Q98)In Bresenham’s circle generation value of initial decision parameter is given by ________

a)s=s+r

b)s=s-r

c)s=3-2*r

d)s=0

Ans.c

Q99) In circle generation algorithm to move center from origin to respective location we perform __________ operation

a)Scaling

b)reflection

c)Rotation

d)Translation

Ans.d

Q100) In bresnham’s circle generation first point on circumference of circle will be ________

a)(1,r)

b)(r,0)

c)(0,r)

d)(r,r)

Ans.c

STRATEGIC PLAN 201216 STRATEGIC PLAN 20122016 UNIVERSITY OF EDINBURGH

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