Q.1 Which of the following is considered a basic output primitive in computer graphics?
Polygon
Pixel
Texture
Shader
Explanation - Pixels are the fundamental unit of an image on a display device and form the basic output primitive.
Correct answer is: Pixel
Q.2 In raster graphics, a line can be drawn efficiently using which algorithm?
Bresenham's algorithm
Dijkstra's algorithm
Floyd-Warshall algorithm
Prim's algorithm
Explanation - Bresenham's line algorithm is an efficient way to determine which pixels should be illuminated to form a close approximation to a straight line.
Correct answer is: Bresenham's algorithm
Q.3 Which primitive is used to create curved shapes in 2D graphics?
Bezier curve
Line segment
Circle pixel
Rectangle
Explanation - Bezier curves are used to model smooth curves that can be scaled indefinitely, widely used in 2D vector graphics.
Correct answer is: Bezier curve
Q.4 Which algorithm is commonly used for drawing circles in raster graphics?
Midpoint circle algorithm
Bresenham's line algorithm
Flood fill algorithm
Scanline algorithm
Explanation - The midpoint circle algorithm calculates the points needed to draw a circle efficiently using integer arithmetic.
Correct answer is: Midpoint circle algorithm
Q.5 Which of the following is NOT a primitive used in output rendering?
Point
Line
Polygon
Texture Mapping
Explanation - Texture mapping is a rendering technique applied to primitives, not a basic primitive itself.
Correct answer is: Texture Mapping
Q.6 A pixel in a raster display represents which of the following?
A small square of color
A vector line
A 3D object
A polygon mesh
Explanation - Each pixel represents a discrete color value in raster graphics, forming the complete image when combined.
Correct answer is: A small square of color
Q.7 In line drawing algorithms, which factor is crucial to decide pixel placement?
Slope of the line
Color of the line
Screen resolution only
Line thickness only
Explanation - The slope determines how the algorithm steps through x and y coordinates to approximate a straight line on a raster display.
Correct answer is: Slope of the line
Q.8 Which of the following is used to fill an enclosed area in raster graphics?
Flood fill algorithm
Bresenham's algorithm
DDA line algorithm
Midpoint circle algorithm
Explanation - Flood fill is used to fill an area bounded by a specific color or boundary in raster graphics.
Correct answer is: Flood fill algorithm
Q.9 What does the DDA in DDA line drawing algorithm stand for?
Digital Differential Analyzer
Digital Drawing Algorithm
Discrete Data Approximation
Direct Display Algorithm
Explanation - The Digital Differential Analyzer (DDA) algorithm incrementally plots points along a line using floating point operations.
Correct answer is: Digital Differential Analyzer
Q.10 In raster graphics, which primitive requires the calculation of intermediate points between endpoints?
Line
Point
Polygon
Text
Explanation - To draw a line between two points on a raster display, intermediate pixel positions must be computed to approximate a straight line.
Correct answer is: Line
Q.11 Which of these is an advantage of using incremental algorithms like Bresenham's?
Reduced computation using integer arithmetic
Supports 3D rendering directly
Automatically textures polygons
Reduces color depth
Explanation - Incremental algorithms reduce the number of calculations and avoid floating-point arithmetic, making them faster for raster displays.
Correct answer is: Reduced computation using integer arithmetic
Q.12 Which primitive is fundamental for constructing polygons in computer graphics?
Line segment
Circle
Bezier curve
Flood fill
Explanation - Polygons are formed by connecting multiple line segments end-to-end.
Correct answer is: Line segment
Q.13 Which output primitive is used for drawing smooth curves in vector graphics?
Spline
Pixel
Rectangle
Triangle
Explanation - Splines provide a smooth curve defined mathematically, commonly used in vector graphics and CAD applications.
Correct answer is: Spline
Q.14 The process of scanning a line from one endpoint to the other to determine which pixels to illuminate is called?
Rasterization
Shading
Clipping
Texturing
Explanation - Rasterization converts geometric primitives into pixel representations for display on raster devices.
Correct answer is: Rasterization
Q.15 Which algorithm is preferred when drawing lines with steep slopes?
Bresenham's algorithm with slope > 1 handling
Flood fill algorithm
DDA without modification
Midpoint circle algorithm
Explanation - Bresenham's algorithm can handle lines with slopes greater than 1 by swapping the roles of x and y axes.
Correct answer is: Bresenham's algorithm with slope > 1 handling
Q.16 In computer graphics, an output primitive for text is usually represented as?
Raster glyphs
Bezier curves
Line segments
Polygons
Explanation - Text is typically represented by raster glyphs or vector outlines, with raster being common in display devices.
Correct answer is: Raster glyphs
Q.17 Which primitive is most suitable for representing straight edges in 3D graphics?
Line segment
Pixel
Circle
Text
Explanation - Line segments are used to model straight edges and wireframes in 3D graphics.
Correct answer is: Line segment
Q.18 Which algorithm avoids floating point operations to increase line drawing efficiency?
Bresenham's line algorithm
DDA line algorithm
Midpoint circle algorithm
Flood fill algorithm
Explanation - Bresenham's algorithm uses only integer arithmetic, making it more efficient than DDA for raster lines.
Correct answer is: Bresenham's line algorithm
Q.19 The process of converting geometric shapes into pixels for display is called?
Rasterization
Clipping
Transformations
Shading
Explanation - Rasterization converts geometric primitives into pixel data that can be displayed on raster devices.
Correct answer is: Rasterization
Q.20 Which primitive can be used to approximate circles in raster displays?
Polygon
Line segment
Pixel
Spline
Explanation - A circle can be approximated using a polygon with many small sides.
Correct answer is: Polygon
Q.21 Which of the following is a disadvantage of DDA line drawing algorithm?
Uses floating point arithmetic, which is slower
Cannot draw steep lines
Cannot draw horizontal lines
Only works for circles
Explanation - DDA uses floating point operations to calculate intermediate points, making it slower than integer-based algorithms like Bresenham's.
Correct answer is: Uses floating point arithmetic, which is slower
Q.22 Which primitive is essential for defining shapes and areas for filling operations?
Polygon
Pixel
Line
Text
Explanation - Polygons enclose areas and are used as the basis for filling algorithms.
Correct answer is: Polygon
Q.23 Which output primitive is most suitable for plotting isolated points on the screen?
Pixel
Line segment
Polygon
Circle
Explanation - Individual pixels are the basic primitives used to plot isolated points in raster graphics.
Correct answer is: Pixel
Q.24 Which line drawing algorithm uses a decision parameter to determine pixel position?
Bresenham's line algorithm
DDA algorithm
Flood fill algorithm
Scanline algorithm
Explanation - Bresenham's algorithm calculates a decision parameter to choose between two pixel positions at each step.
Correct answer is: Bresenham's line algorithm