Computer Graphics Applications and Core Components MCQs: 12 Solved Questions with Explanations

Computer graphics questions span packages, primitives, displays, colour models, viewing, file formats, and rendering. Most reduce to four distinctions: what a representation stores, where display light comes from, how a 3-D scene becomes a 2-D image, and how pixel dimensions determine data rate. Attempt the 12 practice questions before reading each explanation. CMY-to-RGB conversion uses component-wise subtraction from 1, and uncompressed video bit rate uses pixel dimensions, bits per pixel, and frames per second.

1. Computer graphics packages and basic primitives

A graphics package provides routines for drawing and manipulating output. Points record positions; lines join them. Polylines and polygons derive from line segments.

Q1. Graphics-package meaning

BPSC 2023. Open Q1 in the Computer Graphics module.

A set of libraries that provides programmatically access to some kind of graphics 2D functions is

• A. Graphics package

• B. Formatting package

• C. Animation package

• D. More than one of the above

• E. None of the above

Answer: A. Graphics package. Libraries providing access to 2-D graphics functions form a graphics package. Formatting and animation tools are narrower categories.

Q2. Basic graphic primitives

UGC NET 2015. Open Q2 in the UGC NET Computer Graphics module.

Which of the following graphic primitives are considered as the basic building blocks of computer graphics?

(a) Points    (b) Lines    (c) Polylines    (d) Polygons

Codes :

• A. (a) only

• B. (a) and (b)

• C. (a), (b) and (c)

• D. (a), (b), (c) and (d)

Answer: B. (a) and (b). Points supply locations, and lines connect them. The intended hierarchy is point -> line segment -> polyline -> closed polygon; polylines and polygons are derived constructions.

2. Solid modelling, perspective, and rendering

The pipeline is model, view, then render: represent the object, apply camera and perspective, and produce the raster image.

Q3. Requirements of solid modelling

DSSSB 2023. Open Q3 in the Computer Graphics module.

Solid modeling is based on ____, ____ and ____ geometric representation of physical object.

• A. complete; valid; unambiguous

• B. complete; valid; varying

• C. incomplete; valid; unambiguous

• D. complete; valid; undefined

Answer: A. complete; valid; unambiguous. The representation covers the whole object, describes a legitimate solid, and permits only one geometric interpretation.

Q4. Distance and perspective

KVS 2013. Open Q4 in the Computer Graphics module.

____ is a technique where the same objects shown further away are shown proportionately smaller.

• A. Dimension

• B. Perspective

• C. Compression

• D. Localization

Answer: B. Perspective. In a pinhole model, projected height is h' = fH/Z. With f = 50 mm, H = 1000 mm, and Z = 2000 mm, h' = (50 × 1000)/2000 = 25 mm. At Z = 4000 mm, h' = (50 × 1000)/4000 = 12.5 mm. Doubling the distance halves the projected size.

Q5. Producing a bitmap from a 3-D scene

KVS 2013. Open Q5 in the Computer Graphics module.

The process of producing bitmapped images from a view of 3-D models in a 3-D scene is called

• A. Rendering

• B. Looping

• C. Cross-dissolving

• D. Imaging

Answer: A. Rendering. Rendering computes visibility, lighting, shading, and pixel colours from a scene and chosen view. It does not construct geometry; “imaging” is too broad.

3. Interactive graphics and vector representation

Q6. Interactive stereoscopic environment

UPPSC 2022. Open Q6 in the Computer Graphics module.

A stereoscopic system in which users can step into a scene and interact with environment is called…

• A. Touch screen

• B. Mouse

• C. Simulation

• D. Virtual reality

Answer: D. Virtual reality. Stereoscopic viewing creates depth, and tracked interaction lets users act inside the environment. Input devices alone are not VR, and simulations need not be immersive.

Q7. Vector image format

DSSSB 2022. Open Q7 in the Computer Graphics module.

Which of the following is a vector image format?

• A. GIF

• B. PNG

• C. EPS

• D. TIFF

Answer: C. EPS. Encapsulated PostScript describes scalable paths and text; GIF, PNG, and TIFF store raster pixels. A vector circle centred at (100, 80) with radius 20, scaled by two, becomes centre (200, 160) and radius 40. Enlarging a 100 × 100 raster to 200 × 200 requires interpolation.

4. Display devices, phosphor persistence, and aspect ratio

Keep these three display ideas separate:

Q8. Non-emissive display device

DSSSB 2022. Open Q8 in the Computer Graphics module.

Which of the following is a non-emissive display device?

• A. CRT monitor

• B. Plasma panel display device

• C. LED display device

• D. LCD display device

Answer: D. LCD display device. In this classification, liquid crystals modulate another light source; CRT, plasma, and LED mechanisms produce visible light.

Q9. Duration of phosphorescence

DSSSB 2021. Open Q9 in the Computer Graphics module.

The duration of phosphorescence exhibited by a phosphor is known as ______.

• A. Phosphorescence

• B. Fluorescence

• C. Persistence

• D. Deflection

Answer: C. Persistence. Persistence is how long phosphor light remains visible after excitation. Deflection controls beam position; phosphorescence and fluorescence name emission phenomena.

Q10. Aspect-ratio definition

KVS 2023. Open Q10 in the Computer Graphics module.

Which of the following options correctly represent the aspect ratio?

• A. It is the ratio of length of the screen to the height of the screen

• B. It is the ratio of height of the screen to the sum of the length and height of the screen

• C. It is a feature that is used to adjust the screen brightness

• D. It is a feature that is used to adjust the screen color composition

Answer: A. Write aspect ratio as width:height. Dividing 1920:1080 by 120 gives 16:9; dividing 1024:768 by 256 gives 4:3. It describes shape, not resolution, diagonal size, brightness, or colour.

5. Computer graphics numericals: CMY conversion and raw video bit rate

On a normalised 0-1 scale, R = 1 - C, G = 1 - M, and B = 1 - Y. Raw video uses bit rate = width × height × bits per pixel × frames per second.

Q11. CMY-to-RGB conversion

DSSSB 2021. Open Q11 in the Computer Graphics module.

What is the RGB co-ordinates of a colour at (0.25, 0.65, 0) in CMY space?

• A. (0.75, 0.25, 1)

• B. (0.85, 0.25, 0)

• C. (0.65, 0.25, 0)

• D. (0.75, 0.35, 1)

Answer: D. (0.75, 0.35, 1). Substitute each CMY component:

• R = 1 - 0.25 = 0.75

• G = 1 - 0.65 = 0.35

• B = 1 - 0 = 1

Check by converting back: (1 - 0.75, 1 - 0.35, 1 - 1) = (0.25, 0.65, 0). Do not copy a CMY channel directly into RGB; subtract it from 1.

Q12. Uncompressed frame bit rate

KVS 2017. Open Q12 in the Computer Graphics module.

What is the bit rate for transmitting uncompressed 800×600 pixel color frame with 8 bits/pixel at 40 frames/second?

• A. 1536 Mbps

• B. 2.4 Mbps

• C. 153.6 Mbps

• D. 15.36 Mbps

Answer: C. 153.6 Mbps. Calculate in stages:

• Pixels per frame: 800 × 600 = 480,000

• Bits per frame: 480,000 × 8 = 3,840,000

• Bits per second: 3,840,000 × 40 = 153,600,000

• Decimal megabits per second: 153,600,000 / 1,000,000 = 153.6 Mbps

Because the frame is uncompressed, apply no compression ratio. Continue from bits per frame to the requested bits per second.

6. Computer graphics MCQ trap map and revision route

For NET preparation, compare UGC NET Computer Science High-Yield Topics. For teaching exams, use Computer Science Pedagogy for Teacher Exams.

7. Computer graphics applications and core components: score map and next step

With 10 to 12 correct, add this topic to a timed CS set. With 7 to 9, redo the display table and numericals. With 0 to 6, revisit model-view-render and vector-raster distinctions.

These solved questions are part of the UP LT Grade Assistant Teacher 2025 Computer Science Course. Continue at the Introduction to Computer Graphics PYQ Questions hub or browse the Govt Teaching Job Exam Preparation category.

Recall: primitives build, modelling represents, viewing and rendering create the image, displays present it, and formulas quantify colour and data rate.