Deck 1: Computer Graphics

Question 1

Which coordinate system is a device-dependent coordinate system?

A)World Coordinate System
B)Model Coordinate System
C)User Coordinate System
D)Screen Coordinate System

Answer 1

Screen Coordinate System

Question 2

Which of the following is the default coordinate system?

A)User Coordinate System
B)World Coordinate System
C)Screen Coordinate System
D)None of the above

Answer 2

World Coordinate System

Question 3

When every entity of a geometric model remains parallel to its initial position, the transformation is called as

A)User Coordinate System
B)World Coordinate System
C)Screen Coordinate System
D)None of the above

Answer 3

World Coordinate System

Question 4

In which type of projection, actual dimensions and angles of objects and therefore shapes cannot be preserved?

A)User Coordinate System
B)World Coordinate System
C)Screen Coordinate System
D)None of the above

Question 5

The matrix representation for translation in homogeneous coordinates is

A)User Coordinate System
B)World Coordinate System
C)Screen Coordinate System
D)None of the above

Question 6

The matrix representation for scaling in homogeneous coordinates is

A)P'=S*P
B)P'=R*P
C)P'=dx+dy
D)P'=S*S

Question 7

The two-dimensional rotation equation in the matrix form is

A)P'=T+P
B)P'=S*P
C)P'=R*P
D)P'=dx+dy

Question 8

What is the use of homogeneous coordinates and matrix representation?

A)To treat all 3 transformations in a consistent way
B)To scale
C)To rotate
D)To shear the object

Question 9

If point are expressed in homogeneous coordinates then the pair of (x, y) is represented as

A)(x', y', z')
B)(x, y, z)
C)(x', y', w')
D)(x', y', w)

Question 10

For 2D transformation the value of third coordinate i.e. w (or h) =?

A)1
B)0
C)-1
D)Any value

Question 11

We can combine the multiplicative and translational terms for 2D into a single matrix representation by expanding

A)2 x 2 matrix into 4x4 matrix
B)2 x 2 matrix into 3 x 3
C)3 x 3 matrix into 2 x 2
D)Only c

Question 12

The general homogeneous coordinate representation can also be written as

A)(h.x, h.y, h.z)
B)(h.x, h.y, h)
C)(x, y, h.z)
D)(x,y,z)

Question 13

In homogeneous coordinates value of 'h' is consider as 1 & it is called…..

A)Magnitude Vector
B)Unit Vector
C)Non-Zero Vector
D)Non-Zero Scalar Factor

Question 14

Which co-ordinates allow common vector operations such as translation, rotation, scaling and perspective projection to be represented as a matrix by which the vector is multiplied?

A)vector co-ordinates
B)3D co-ordinates
C)affine co-ordinates
D)homogenous co-ordinates

Question 15

In Coordinates, a points in n-dimensional space is represent by (n+1) coordinates.

A)Scaling
B)Homogeneous
C)Inverse transformation
D)3D Transformation

Question 16

A translation is applied to an object by 2D

A)Repositioning it along with straight line path
B)Repositioning it along with circular path
C)Only b
D)All of the mentioned

Question 17

We translate a two-dimensional point by adding

A)Translation distances
B)Translation difference
C)X and Y
D)Only a

Question 18

The translation distances (dx, dy) is called as

A)Translation vector
B)Shift vector
C)Both a and b
D)Neither a nor b

Question 19

In 2D-translation, a point (x, y) can move to the new position (x', y') by using the equation

A)x'=x+dx and y'=y+dx
B)x'=x+dx and y'=y+dy
C)X'=x+dy and Y'=y+dx
D)X'=x-dx and y'=y-dy

Question 20

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

Question 21

-------is a rigid body transformation that moves objects without deformation.

A)Rotation
B)Scaling
C)Translation
D)All of the mentioned

Question 22

A straight line segment is translated by applying the transformation equation

A)P'=P+T
B)Dx and Dy
C)P'=P+P
D)Only c

Question 23

Polygons are translated by adding to the coordinate position of each vertex and the current attribute setting.

A)Straight line path
B)Translation vector
C)Differences
D)Only b

Question 24

To change the position of a circle or ellipse we translate

A)Center coordinates
B)Center coordinates and redraw the figure in new location
C)Outline coordinates
D)All of the mentioned

Question 25

The basic geometric transformations are

A)Translation
B)Rotation
C)Scaling
D)All of the mentioned

Question 26

A two dimensional rotation is applied to an object by

A)Repositioning it along with straight line path
B)Repositioning it along with circular path
C)Only b
D)Any of the mentioned

Question 27

To generate a rotation , we must specify

A)Rotation angle ?
B)Distances dx and dy
C)Rotation distance
D)All of the mentioned

Question 28

The rotation axis that is perpendicular to the xy plane and passes through the pivot point is known as

A)Rotation
B)Translation
C)Scaling
D)Shearing

Question 29

Positive values for the rotation angle ? defines

A)Counter clockwise rotations about the end points
B)Counter clockwise translation about the pivot point
C)Counter clockwise rotations about the pivot point
D)Negative direction

Question 30

The original coordinates of the point in polar coordinates are

A)X'=r cos (? +?) and Y'=r cos (? +?)
B)X'=r cos (? +?) and Y'=r sin (? +?)
C)X'=r cos (? -?) and Y'=r cos (? -?)
D)X'=r cos (? +?) and Y'=r sin (? -?)

Question 31

From the following, which one will require 4 matrices to multiply to get the final position?

A)Rotation about the origin
B)Rotation about an arbitrary Point
C)Rotation about an arbitrary line
D)Scaling about the origin

Question 32

Rotation is simply---------object w.r.t origin or centre point.

A)Turn
B)Shift
C)Compression
D)Drag element

Question 33

A line AB with end point A (2,3) & B (7,8) is to be rotated about origin by 300 in clockwise direction. Determine the coordinates of end points S of rotated line.

A)(3.232, 2.598)
B)(5.232, 3.598)
C)(3.232, 1.298)
D)(3.232, 1.598)

Question 34

An ellipse can also be rotated about its center coordinates by rotating

A)End points
B)Major and minor axes
C)Only a
D)None

Question 35

The transformation that is used to alter the size of an object is

A)Scaling
B)Rotation
C)Translation
D)Reflection

Question 36

Scaling of a polygon is done by computing

A)The product of (x, y) of each vertex
B)(x, y) of end points
C)Center coordinates
D)Only a

Question 37

We control the location of a scaled object by choosing the position is known as…………………………….

A)Pivot point
B)Fixed point
C)Differential scaling
D)Uniform scaling

Question 38

If the scaling factors values sx and sy are assigned to the same value then………

A)Uniform rotation is produced
B)Uniform scaling is produced
C)Scaling cannot be done
D)Scaling can be done or cannot be done

Question 39

If the scaling factors values Sx and Sy are assigned to unequal values then

A)Uniform rotation is produced
B)Uniform scaling is produced
C)Differential scaling is produced
D)Scaling cannot be done

Question 40

The objects transformed using the equation P'=S*P should be

A)Scaled
B)Repositioned
C)Both a and b
D)Neither a nor b

Question 41

If the scaling factors values Sx and Sy < 1 then

A)It reduces the size of object
B)It increases the size of object
C)It stunts the shape of an object
D)None

Question 42

If the value of Sx=1 and Sy=1 then

A)Reduce the size of object
B)Distort the picture
C)Produce an enlargement
D)No change in the size of an object

Question 43

The polygons are scaled by applying the following transformation.

A)X'=x * Sx + Xf(1-Sx) & Y'=y * Sy + Yf(1-Sy)
B)X'=x * Sx + Xf(1+Sx) & Y'=y * Sy + Yf(1+Sy
C)X'=x * Sx + Xf(1-Sx) & Y'=y * Sy - Yf(1-Sy)
D)X'=x * Sx * Xf(1-Sx) & Y'=y * Sy * Yf(1-Sy)

Question 44

Reflection is a special case of rotation.

Question 45

If two pure reflections about a line passing through the origin are applied successively the result is

A)Pure rotation
B)Quarter rotation
C)Half rotation
D)True reflection

Question 46

What is the determinant of the pure reflection matrix?

A)1
B)0
C)-1
D)2

Question 47

Which of the following is NOT true? Image formed by reflection through a plane mirror is

A)of same size
B)same orientation
C)is at same distance from the mirror
D)virtual

Question 48

Which of the following represents shearing?

A)(x, y) ? (x+shx, y+shy)
B)(x, y) ? (ax, by)
C)(x, y) ? (x cos(?)+y sin(?), -x sin(?)+y cos(?))
D)(x, y) ? (x+shy, y+shx)

Question 49

If a '3 x 3' matrix shears in X direction, how many elements of it are '1'?

A)2
B)3
C)6
D)5

Question 50

If a '3 x 3' matrix shears in Y direction, how many elements of it are '0'?

A)2
B)3
C)6
D)5

Question 51

Shearing is also termed as

A)Selecting
B)Sorting
C)Scaling
D)Skewing

Question 52

Shearing and reflection are types of translation.

Question 53

Which of this is compulsory for 2D reflection?

A)Reflection plane.
B)Origin
C)Reflection axis
D)Co-ordinate axis.

Question 54

Two successive translations are

A)Multiplicative
B)Inverse
C)Subtractive
D)Additive

Question 55

Two successive translations are commutative.

Question 56

General pivot point rotation can be expressed as

A)T(zr,yr).R(?).T(-zr,-yr) = R(xr,yr,?)
B)T(xr,yr).R(?).T(-xr,-yr) = R(xr,yr,?).
C)T(xr,yr).R(?).T(-xr,-yr) = R(zr,yr,?)
D)T(xr,yr).R(?).T(-xr,-yr) = R(zr,yr,?).

Question 57

Which of the following is NOT correct (A, B and C are matrices)

A)A?B = B?A
B)A?B?C = (A?B) ?C = A? (B?C)
C)C(A+B) = C?A + C?B
D)1 A = A 1

Question 58

Reflection about the line y=0, the axis, is accomplished with the transformation matrix with how many elements as '0'?

A)8
B)9
C)4
D)6

Question 59

Which transformation 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?

A)Rotation
B)Scaling up
C)Scaling down
D)Shearing

Question 60

Transpose of a column matrix is

A)Zero matrix
B)Identity matrix
C)Row matrix
D)Diagonal matrix

Question 61

Reversing the order in which a sequence of transformations is performed may affect the transformed position of an object.

Question 62

How many minimum numbers of zeros are there in '3 x 3' triangular matrix?

A)4
B)3
C)5
D)6

Question 63

The object space or the space in which the application model is defined is called

A)World co-ordinate system
B)Screen co-ordinate system
C)World window
D)Interface window

Question 64

What is the name of the space in which the image is displayed?

A)World co-ordinate system
B)Screen co-ordinate system
C)World window
D)Interface window

Question 65

What is the rectangle in the world defining the region that is to be displayed?

A)World co-ordinate system
B)Screen co-ordinate system
C)World window
D)Interface window

Question 66

The window opened on the raster graphics screen in which the image will be displayed is called

A)World co-ordinate system
B)Screen co-ordinate system
C)World window
D)Interface window

Question 67

The process of mapping a world window in World Coordinates to the Viewport is called Viewing transformation.

Question 68

Panning is a technique in which users can change the size of the area to be
viewed in order to see more detail or less detail.

Question 69

Drawing of number of copies of the same image in rows and columns across the interface window so that they cover the entire window is called

A)Roaming
B)Panning
C)Zooming
D)Tiling

Question 70

By changing the dimensions of the viewport, the and of the objects being displayed can be manipulated.

A)Number of pixels and image quality
B)X co-ordinate and Y co-ordinate
C)Size and proportions
D)All of these

Question 71

Co-ordinates are ranging according to the screen resolution.

Question 72

Any convenient co-ordinate system or Cartesian co-ordinates which can be used to define the picture is called

A)spherical co-ordinates
B)vector co-ordinates
C)viewport co-ordinates
D)world co-ordinates

Question 73

The transformation of perspective projection must include, where d is the distance between the center of projection to the projection plane.

A)D
B)1/d
C)-d
D)-1/d

Question 74

An area on a display device to which a window is mapped is called a………….

A)Window
B)Viewpoint
C)Pixel
D)None of the above

Question 75

A Pixel is

A)a computer program that draws picture
B)A picture stored in secondary memory
C)The smallest resolvable part of a picture
D)All of the above

Question 76

A system that automates the drafting process with interactive computer graphics is called

A)Computer Aided Engineering (CAE)
B)Computer Aided Design (CAD)
C)Computer Aided Manufacturing (CAM)
D)Computer Aided Instruction (CAI)

Question 77

In which type of projection, actual dimensions and angles of objects and therefore shapes cannot be preserved?

A)Orthographic
B)Isometric
C)Perspective
D)None of the above

Question 78

Coordinate of ?ABCD is WCS are: lowermost corner A(2,2) & diagonal corner are C(8,6). W.r.t MCS. The coordinates of origin of WCS system are (5,4). If the axes of WCS are at 600 in CCW w.r.t. the axes of MCS. Find new vertices of point A in MCS.

A)(4.268, 6.732)
B)(5.268, 6.732)
C)(4.268, 4.732)
D)(6.268, 4.732)

Question 79

A line AB with end points A (2, 1) & B (7, 6) is to be moved by 3 units in x-direction & 4 units in y-direction. Calculate new coordinates of points B.

A)(10, 2)
B)(2, 10)
C)(10, 10)
D)(10, 5)