CG MCQs

1)This projection technique has the direction of projection perpendicular to the viewing plane, and the viewing direction is perpendicular to one of the principle faces. >1.Orthographic Parallel Projection 2.Axonometric Parallel Projection 3.Oblique Parallel Projection 4.Trimetric Projection}

2)Special system designed for some of the training applications are known as? 1.GUI >2.Simulators 2.Video display devices 3.None of the above}

3)One of the Disadvantages of raster scan display is, 1.Decreasing memory costs have made raster systems popular 2.High degree realism is achieved in picture with the aid of advanced shading and hidden surface technique >3. The lines produced are zigzag as the plotted values are discrete}

4)The process of determining the suitable pixels for representing image or graphic object is called: A)Animation >B) Rasterization C) Scan-Conversion D) Quantization}

1

5)A graphical technique in which an object is transformed into another in such a way that the change appears to be smooth and not rapid is called: {A)Mapping > B) Scan-Conversion

C) Sampling

D) Quantization}

A pixel of black-white image or graphic object take space in memory >{A) 1 bit B) 2 bits C) 1 byte D) 1 nibble}

The resolution of a printer is measured in terms of: 1.Pixel density 2.Dot pitch 3.Hertz >4.Dpi}

The principle advantage of adding memory to a printer is to increase: {a)Resolution >b)Print speed c)Number of colors in output d)Dpi}

A laser printer works by: >{a)Removing static electrical charge from a metal drum b)Utilizing drop-on-demand technology 2

c)Striking the paper with hammer-like keys d)A process called direct-thermal printing}

The fastest and quietest type of printer is a(n): {a)Dot-matrix printer b)Inkjet printer >c)Laser printer d)Plotter}

The following are all advantages of LCD over CRT monitors EXCEPT: >{a)Wider viewing area relative to size of the monitor. b)Less likely to cause eyestrain. c)More friendly to the environment. d)Wider viewing angle.}

The main advantage of active matrix over passive matrix technology is that active matrix panels: >{a)Have higher screen resolution. b)Can selectively recharge individual pixels. c)Cost less than passive matrix panels. d)Require less power consumption than passive matrix panels.}

The maximum complete electron scans of current CRT monitors is ____________ times per second. {a)25

3

b)50 c)75 d)100}

The larger the number of pixels of a computer monitor, the higher its: >a)Resolution. b)Refresh rate. c)Dot pitch. d)Data transfer rate

The size of a 640*480 image at 240 pixels per inch is >A)8/3*2 inches B)2*2 inches C)3*2 inches D)none of these

The resolution of 2*2 inch image that has 512*512 pixels is {A)256*256 pixels per inch > B)256 pixels per inch C)128*128 pixels per inch D)128 pixels per inch}

If we want to resize a 1024*746 image to one that is 640 pixels wide with the same aspect ratio, 4

the height of resized image would be {A)768 B)512 >C)480 D)1024}

RGB co-ordinates of a color at (0.15, 0.75, 0) in CMY space {A)(0.85,0.25,1) B)(1.15,1.75,1) C)(2.15,2.75,2) D)None of these}

If we use direct coding of RGB values with 2 bits per primary color, how many possible colors do we have for each pixel? {a) 32 b) 64 c) 128 d) 16}

Persistence can be defined as {a)Intensity of a pixel b)Pixels per unit area > c)The duration of phosphorescence exhibited by a phosphor d)Number of pixels in an image}

5

The path the electron beam takes at the end of each refresh cycle is called: {a)horizontal retrace >b)vertical retrace c)diagonal retrace d)left to right retrace}

The path the electron beam takes when returning to the left side of the CRT screen is called > {a)horizontal retrace b)vertical retrace c)diagonal retrace d)top to bottom retrace}

Frame buffer is used to store a)only pixels b)only intensities of pixels > c)image definition d)coordinate values of image

The best line drawing algorithm among all possible line drawing algorithm is {a)DDA b)Algorithm which uses direct equation of line >c)Bresenham’s algorithm d)None of them}

6

The value of initial decision parameter in bresenham’s line drawing algorithm for │m│{a)2∆y - ∆x b)2∆y + ∆x c)-2∆y + ∆x d)-2∆y - ∆x}

The best circle drawing algorithm among all possible circle drawing algorithm is: {A) algorithm uses direct equation of circle b) Algorithm uses polar coordinate form >c) bresenham’s circle drawing algorithm d)mid point circle drawing algorithm}

The value of initial decision parameter in mid point circle drawing algorithm is :{a)3-2r > b)5/4-r c)1-2r d)3-r} Points P1(3.2 ,7.8) and P2(3.7,7.1) are both represented by pixel a)(3,8) b)(4,7) >c)(3,7) d)(4,8)

Pixel phasing is an anti-aliasing technique based on 7

{a)hardware b)software c)both hardware and software d)none of these}

The transformation that enhances or reduces the size of object is called {(a)Translation > (b)Scaling (c)Shear (d)Rotation}

The transformation that changes the coordinate positions of an object along a circular path is called {(a)Translation (b)Scaling > (c)Rotation (d)Reflection}

The transformation that changes the coordinate position of an object along a straight line path is called >{(a)Translation (b)Scaling (c)Rotation (d)Reflection}

8

The result of two successive 2D rotations R(Q1) and R(Q2) is >{(a)R(Q1+Q2) (b)R(Q1.Q2) (c)R(Q1-Q2) (d)R(Q1/Q2)}

If we take mirror reflection of a point(x, y) along x-axis and the position of point after mirror reflection is denoted by (x’, y’), then >{(a)x’=x ,y’=-y (b)x’=-x ,y’=y (c) x’=x ,y’=y (d)x’=-x, y’=-y}

When projection lines perpendicular to the view plane, then such type of projection is called {(a)Parallel (b)Perspective >(c)Orthographic (d)Oblique} A polygon is called ------- if the line joining any two interior points of the polygon lies completely inside the polygon {(a)Concave >(b)Convex (c)Positively oriented polygon 9

(d)Negatively oriented polygon} In Cohen-Sutherland line clipping algorithm, if the bitwise logical AND of the region codes is 0000, then line is { (a)Visible (b)Not visible >(c)A candidate for clipping (d)None of these}

Which of the following transformations are non-commutative {A)linear followed by scaling >B)linear followed by rotation C)scaling followed by rotation D)none of the above} Reflection of a point y about x-axis followed by a counter-clockwise rotation of 90°, is equivalent to reflection about the line A)x=-y B)y=-x C)x=y D)x + y=1

A bilinear transformation can be simulated A)translation, rotational and stretching B)translation and rotation C)rotation, stretching and inversion

10

D)rotation, stretching, inversion, and translation}

Shadow-mask methods are commonly used in >{a)Raster-Scan Systems b)LED c)DVST d)LCD}

Front, side and rear orthographic projections of an object are called {a)Plan View > b)Elevations c)Axonometric d)Isometric}

A circle, if scaled in only one dimension becomes a/an {(a)Parabola (b)Hyperbola >(c)Ellipse (d)Remains a circle}

The line segment joining (1,1) and (4,2) if clipped against this window will connect the points {(a)(0,1) and (3,3) 11

(b)(0,1) and (2,3) (c)(1,1) and (4,2) (d)none of the above}

Engineering drawing commonly applies {a)Oblique projection >(b)Orthographic projection (c)Perspective projection (d)None of the above}

A transformation that distorts the shape of an object such that the transformed shape appears as if the object were composed of internal layers that had been caused to slide over each other, such transformation is called >{a)Shear b)Translation c)Reflection d)Rotation}

An area on a display device to which a window is mapped is called {a)Window > b)View-port c)Monitor d)Workstation}

12

Random-scan monitors are also referred to as >a)vector display b)stroke writing display c)calligraphic display d)none of the above}

The refresh rate below which a picture flickers is {a)25 b)30 c)35 > d)60}

Special system designed for some training applications are known as {(a) GUI >(b) Simulators (c) Video display devices (d) None of the above}

Graphics and Image processing techniques used to produce a transformation of one person into another is called {(a) Animation >(b) Morphine (c) Half toning (d) None of the above}

13

Refreshing on raster scan displays is carried out at the rate of >{(a) 60 to 80 frames per sec (b) 40 to 60 frames per sec (c) 30 to 60 frames per sec (d) None of the above}

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 the above}

The maximum number of points that can be displayed without overlap on a CRT is referred to as >(a) Resolution (b) Persistence (c) Attenuation (d) None of the above}

Gray scale is used in {(a) Monitors that have color capability >(b) Monitors that have no color capability (c) Random scan displays (d) none of the above} 14

Shadow mask methods produce >(a) Wider range of colors than beam penetration (b) Smaller range of colors than beam penetration (c) Equal number of colors as in beam penetration (d) None of the above}

A common device for drawing, positioning or interactively selecting co-ordinate positions on an object is >a) Digitizer b) Data glove (c) Joystick d) None of the above} In the Bresenhan's algorithm, error term is initialized to {a) 0 b) 1 > c) -1/2 d) None of the above} A circle drawn on the screen appears to be elliptical {a) Screen has rectangular shape b) CRT is not completely spherical >c) It is due to the aspect ratio of the monitor d) Our eyes are not at the same level as the screen}

In the generation of circle by Bresenhan's algorithm, it is simple to generate {a) All octants >b) One octant first and others by successive reflection c) One octant first and others by successive rotation 15

d) One octant first and others by successive translation}

Which of the following algorithms can be used for circle generation? (a) Bresenham's algorithm (b) Midpoint algorithm >(c) Both (a) and (b) (d) None of the above}

Which of the following pixels will not be "ON" for drawing an origin-centered circle with radius 8? >(a) 0,8 (b) 1,8 (c) 4,6 (d) 5,6} Window is associated with >(a) Object (b) Image (c) Both (a) and (b) (d) None of the above}

A line with end point codes as 0000 and 0100 is >(a) Partially invisible (b) Completely visible (c) Trivially visible (d) Completely invisible}

Which of the following techniques is used in Midpoint Subdivision algorithm? >(a) Binary search (b) Bubble sort (c) Linear search (d) Sequential search}

Clipping algorithm which follows "Divide and conquer" strategy is {(a) Sutherland - Cohen algorithm (b) 4 - bit algorithm >(c) Midpoint subdivision 16

(d) Cyrus - Beck algorithm}

Which of the following are transformations? (a) Translation (b) Rotation (c) Shearing > (d) All of the above}

How many matrices are required to rotate an object about a point (x, y) >(a) 2 (b) 3 (c) 4 (d) 5}

Panning on the screen can be achieved by (a) Translation and back scaling (b) Only translation >(c) Scaling, translation and back scaling (d) Translation, scaling and back translation

Dragging in computer graphics can be achieved through following transformations: >(a) Translation (b) Rotation (c) Scaling (d) Reflection}

In 2D graphics, the transformation 0

1

0

results in:

1

0

0

0

0

1

>(a) Reflection about line y=x 17

b) Reflection about line y= -x c) Reflection about line y=0 d) Shearing about x - axis}

If the direction of rotation is 'z' axis, then direction of positive rotation is: (a) Y to Z b) Z to X >c) X to Y d) Y to X}

Anticlockwise rotation of 90 degrees about z-axis would transfer a point > {(a) On positive x-axis to negative y-axis (b) On positive x-axis to y-axis (c) On positive x-axis to y-axis (d) On positive x-axis to negative y-axis}

Pick out the wrong statement {(a) In local scaling, if Sx=Sy, then shape is retained > (b) In overall scaling, shape is never distorted (c) When shearing transformation is applied to any object, then its shape is distorted (d) None of the above}

Perspective projection of the point [2,3,1] on Z=0 plane with the eye placed at (0,0,-10) is :{a) (20/11,30/11,0)

18

b) (20/10,30/10,0) c) (2/10,3/10,0) >d) (-2/10,-3/10,0)}

Maximum numbers of vanishing points that can appear in case of a 3-D object are {(a) 3 (b) 4 (c) 2 (d) 1}

If center of projection lies on y-axis, then vanishing point appears at : {(a) X-axis (b) Y-axis (c) Z-axis (d) None of the above}

CMY color model has 4 color phosphors >(a) Cyan, magenta, yellow, black (b) Cyan, magenta, red, white (c) Cyan, magenta, yellow, white (d) All of the above}

Which of the following statements about OpenGL is incorrect {(a) It is not a programming language (b) It is an API >(c) It is a header file (d) None of the above}

Identify the incorrect data type {(a) Glint (b) Openglfloat (c) Openglchar >(d) All of the above}

Which of the following is not true? {(a) OpenGL commands use prefix “gl” 19

(b) All constants are in upper case >(c) All data types start with GL (d) All are correct}

Resolution is defined as ……………… >{a)The number of pixels in the horizontal direction × The number pixels in the vertical direction b)The number of pixels in the vertical direction × The number pixels in the horizontal direction c)The number of pixels in the vertical direction + The number pixels in the horizontal direction d)The number of pixels in the vertical direction - The number pixels in the horizontal direction}

Aspect ratio is >a)The ratio of image’s width to its height b)The ratio of window to viewport height c)The ratio of image’s intensity levels d)The ratio of image’s height to its width}

20

Refresh rate is ………………….. {a)The rate at which the number of bit planes are accessed at a given time > b)The rate at which the picture is redrawn c)The frequency at which the aliasing takes place d)The frequency at which the contents of the frame buffer is sent to the display monitor}

Document imaging uses what device to input data? >{a)Scanner b)Bar-code reader c)Icon d)Tablet}

The resolution of an SVGA screen is >

a) 1024 x 768 b) 512 x 512 c) 640 x 480 d) 800 x 800

Q210) GUI is a)Hardware b)Language interpreter >c)Software interface d)An operating system.

21

The three dimensional matrix transformation for rotation with an angle Ө with respect to x-axis in the positive direction is > a) 1

0

0

0

0

cosө sinө 0

0

-sinө cosө 0

0

0

0

1

b) 1

0

0

0

cosө -sinө 0

0

sinө cosө 1

0

0

0

0

1

c) 1

0

0

0

0

cosө sinө 0

0

-cosө sinө 0

0

0

0

1

d) 1

0

0

0

cosө -sinө 0

0

-sinө cosө 1

0

0

1

0

0

Aliasing means………… > a)Rendering effect b)Shading effect c) Staircase effect d) Cueing effect}

22

…………………..acts as anode in CRT >a)The phosphorous coating b)The glass panel c)The deflectors d)None of these}

In Bresenham’s circle generating algoritms, if (x,y) is the current pixel position then the x-value of the next pixel position is…………………………. {a) x

b) x-1 >c) x+1 d) x+2}

In Bresenham’s circle generating algoritms, if (x,y) is the current pixel position then the y-value of the next pixel position is………………………… {a) y or y+1 b) y alone >c) y+1 or y-1 d) y or y-1}

Run length coding is used for………………… {a)Image smoothening > b)Image compression c)Image coloring d)Image dithering}

The technique of using a minimum number of intensity levels to obtain increased visual resolution is called…………………… {a)Dithering >b)Halftoning c)Depth cueing d)Rendering}

If XL, XR, YB, YT represent the four parameters of x-left, x-right, y-bottom and y-top of the clipping window and (x,y) is a point inside the window then………………. >{a)XL≤ x ≤ XR and YB ≤ y ≤ YT b)XL≤ x ≤ XR and YB ≥ y ≥ YT c)XL ≥ x ≥ XR and YB ≤ y ≤ YT 23

d)XL ≥ x ≥ XR and YB ≥ y ≥ YT}

The Cohen-Sutherland line clipping algorithm divides the entire region into……………number of sub regions { a)4 b)8 >c)9 d)10}

……………… number of bits are used for representing each subregion of the Cohen-Sutherland line clipping algorithm. {a)1 b)2 c)3> d)4}

In the Cohen-Sutherland line clipping algorithm, if the logical AND of the codes of the two points P and Q is 0000 then the line segment joining the points P and Q will be ……………………….. the clipping window {a)Totally outside >b)Partially outside c)Totally inside d)None}

The two dimensional matrix transformation for reflection of a point with respect to y-axis is ___________ >{a)-1

0

0

0

1

0

0

0

1

b) 1

0

0

0 -1

0

0

0

1

c) 1

0

0

-1

0

0

0

0

1 24

d) 1

0

0

0

1

0

0

0 -1}

The traditional mouse requires a mouse pad to provide friction for its: {a)Touchpad. b)Tracker. c)Optical sensor. >d)Rollerball.}

The standard input device for a PDA is a: {a)Stylus. >b)Touch pad. c)Keyboard. d)Trackball mouse.}

The flicker effect of a cathode ray tube is controlled by its: {a)Resolution. >b)Refresh rate. c)Dot pitch. d)Data transfer rate. }

25