Hello students this page provides you with Computer Graphics MCQ-5
Q.1 The DDA algorithm is a faster method for calculating pixel positions than the direct use of the line equation y = mx + c because?
It eliminates floating point addition
It eliminates floating point multiplication
It eliminates rounding operation
None of these
Explanation
Unlike the direct line equation which requires multiplication for every step, DDA uses incremental addition, which is computationally cheaper than multiplication.
Q.2 Which of the following acts as the anode in a Cathode Ray Tube (CRT)?
The Phosphorous coating
The glass panel
The deflectors
None of these
Explanation
The phosphorous coating on the inside of the CRT screen is often connected to a high-voltage supply to act as an anode, attracting the electron beam.
Q.3 Interactive computer graphics are useful in which of the following areas?
Training pilots
Process control
CAD (Computer Aided Design)
All of these
Explanation
Interactive graphics allow for real-time feedback and manipulation, making them essential for simulators, design tools, and monitoring systems.
Q.4 A point (3,5) is rotated counter-clockwise by an angle of 45 degrees. Find the new coordinates.
X',Y'(-2/√2, 8/√2)
X',Y'(-3/√2, 3/√2)
X',Y'(5/√2, 8/√2)
None of these
Explanation
Using rotation formulas: x’ = x cosθ – y sinθ and y’ = x sinθ + y cosθ. For (3,5) and 45°, x’ = (3-5)/√2 = -2/√2 and y’ = (3+5)/√2 = 8/√2.
Q.5 What is the slope of the line joining the points (1,2) and (3,4)?
0
1
2
3
Explanation
Slope (m) = (y2 – y1) / (x2 – x1). Here, (4 – 2) / (3 – 1) = 2 / 2 = 1.
Q.6 Scale the polygon A(3,4), B(7,10), C(9,3) by 3 units in the X direction and 2 units in the Y direction.
A'(9,7), B'(21,10), C'(27,6)
A'(9,8), B'(21,11), C'(27,5)
A'(9,8), B'(21,10), C'(27,6)
None of these
Explanation
Scaling is done by multiplying: x’ = x * Sx and y’ = y * Sy. A(33, 42) = (9,8). C(93, 32) = (27,6).
Q.7 In the beam penetration method of color CRT, which two layers of phosphor are typically coated?
Red and blue
Blue and green
Red and green
None of these
Explanation
Beam penetration CRTs use two layers of phosphor (usually red and green). The color displayed depends on how deeply the electrons penetrate these layers.
Q.8 A shadow mask CRT has ________ phosphor color dots at each pixel position.
1
2
3
None of these
Explanation
Shadow mask monitors use a triad of red, green, and blue phosphor dots at each pixel location to produce a full range of colors.
Q.9 Which technique of color CRT is generally used for the production of realistic images?
Beam penetration method
Shadow mask method
Both A & B
None of these
Explanation
According to the provided material, Beam Penetration is highlighted, though in modern contexts, Shadow Mask is the standard for high-quality color.
Q.10 Which device is specifically used in virtual reality to grasp or move a virtual object?
Space ball
Data glove
Digitizer
Touch panels
Explanation
A data glove is an input device equipped with sensors that track hand movements, allowing users to interact with objects in a virtual environment.
Q.11 The Beam Penetration method for color production is primarily used in which system?
Raster scan system
Random scan system
Both A & B
None of these
Explanation
Beam penetration is typically used in random scan (vector) monitors because it is easier to implement without a complex shadow mask.
Q.12 The Shadow Mask method for color production is primarily used in which system?
Raster scan system
Random scan system
Both A & B
None of these
Explanation
Raster scan systems (like traditional TVs and PC monitors) use shadow masks to accurately target the red, green, and blue phosphors.
Q.13 Which algorithm displays line type attributes by plotting specific pixel spans?
Raster Line Algorithm
Random scan Algorithm
Random line Algorithm
None of these
Explanation
Raster line algorithms determine which discrete pixels should be turned on to represent a continuous line on a grid.
Q.14 The quality and detail of a digital image primarily depend on?
Number of pixels used by the image
Number of lines used by the image
Both A & B
None of these
Explanation
The resolution, which is determined by the total number of pixels, directly impacts the clarity and quality of an image.
Q.15 Graphics data is computed and transmitted by the processor in the form of?
Digital signals
Analog signals
Electrical signals
None of these
Explanation
At the physical hardware level, all data processed by the computer is handled as electrical signals/pulses.
Q.16 The maximum number of points that can be displayed without overlap on a CRT is called?
Refresh rate
Interlacing
Screen resolution
None of these
Explanation
Resolution defines the maximum number of individual points (pixels) that can be clearly distinguished on a display screen.
Q.17 What is the name of the memory where graphics data is stored before being displayed on the screen?
RAM
ROM
Frame buffer
None of these
Explanation
The frame buffer is a specialized portion of RAM used to store the bitmap that is currently being ‘painted’ on the screen.
Q.18 Which of the following are commonly used software tools for viewing graphics?
Windows Picture Viewer
Internet Explorer
Both A & B
None of these
Explanation
Both image viewing applications and web browsers are standard tools used to render and display graphical files.
Q.19 2D Animation techniques are fundamentally based on which format?
Vector based
Random based
Both A & B
None of these
Explanation
Modern 2D animation often uses vector-based graphics because they can be scaled infinitely without losing quality.
Q.20 The maximum number of dots that can be displayed without overlap on a CRT is referred to as?
Refresh rate
Interlacing
Screen resolution
None of these
Explanation
Screen resolution is the specific term for the density of pixels available on a display.
Related Link
- Computer Graphics MCQ