Computer Graphics & Multimedia Previous Year Questions
8 Computer Graphics & Multimedia (Computer Science) questions asked in UGC NET previous year papers, each with the correct answer and explanation. Read them free on UTpaper, or attempt the full papers as timed online tests.
Q1UGC NET Computer Science, June 2014 (Paper II & III, Selected Questions)
Given an image of size 1024 × 1024 pixels in which intensity of each pixel is an 8-bit quality. It requires _______ of storage space if the image is not compressed.
AOne Terabyte
BOne Megabyte
C8 Megabytes
D8 Terabytes
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Correct answer: (B) One Megabyte
Explanation
Each pixel needs 1 byte (8 bits) and there are 1024 × 1024 pixels. Total storage space = 1024 × 1024 × 1 = 2¹⁰ × 2¹⁰ = 2²⁰ bytes = 1 MB. So the answer is (b).
Q2UGC NET Computer Science, December 2014 (Paper II & III, Selected Questions)
A technique used to approximate halftones without reducing spatial resolution is known as______
AHalf toning
BDithering
CError diffusion
DNone of the above
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Correct answer: (B) Dithering
Explanation
Dithering approximates halftones without reducing spatial resolution. The dither matrix is treated like a floor tile that is repeatedly positioned one copy next to another to cover the entire image.
Q3UGC NET Computer Science, December 2014 (Paper II & III, Selected Questions)
Which of the following categories of language do not refer to animation language?
AGraphical languages
BGeneral-purpose languages
CLinear-list notations
DNone of the above
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Correct answer: (D) None of the above
Explanation
All three categories refer to animation languages: linear-list notations (e.g. 'B rotate palm'), general-purpose languages (e.g. ASAS), and graphical languages. So the answer is None of the above.
Q4UGC NET Computer Science, June 2015 (Paper II & III, Selected Questions)
Which of the following statement(s) is/are incorrect?
(1) Mapping the co-ordinates of the points and lines that form the picture into the appropriate co-ordinates on the device or workstation is known as viewing transformation
(2) The right-handed Cartesian co-ordinates system in whose co-ordinates we describe the picture is known as world co-ordinate system
(3) The co-ordinate that corresponds to the device or workstation where the image is to be displayed is known as physical device co-ordinate system
(4) Left - handed co-ordinate system in which the display area of the virtual display device corresponds to the unit (1 × 1) square whose lower left-hand corner is at the origin of the co-ordinate system, is known as normalized device co-ordinate system
A(1) only
B(1) and (2)
C(3) only
D(4) only
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Correct answer: (D) (4) only
Explanation
Normalized device co-ordinates describe positions on a virtual plotting device: the lower left corner is (0,0) and the upper right corner is (1,1). NDC is a right-handed system, not left-handed, so statement (4) is incorrect.
Q5UGC NET Computer Science, June 2015 (Paper II & III, Selected Questions)
The redundancy in images stems from :
APixel decorrelation
BPixel correlation
CPixel quantization
DImage size
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Correct answer: (B) Pixel correlation
Explanation
The redundancy in images stems from pixel correlation. If the image is transformed to a representation where the pixels are decorrelated, the redundancy is eliminated and the image can be compressed.
Q6UGC NET Computer Science, December 2015 (Paper II & III, Selected Questions)
Which of the following graphic primitives are considered as the basic building blocks of computer graphics?
(1) Points
(2) Lines
(3) Polylines
(4) Polygons
Codes :
A(1) only
B(1) and (2)
C(1), (2) and (3)
D(1), (2), (3) and (4)
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Correct answer: (B) (1) and (2)
Explanation
A pixel is a point of light, one tiny dot on a raster display; though it has no structure, it is a building block and a graphics primitive. Lines, especially straight lines, constitute the basic building block of line graphs, bar and pie charts, graphs of mathematical functions, engineering drawings and architectural plans. Points and lines are the basic building blocks of computer graphics.
Q7UGC NET Computer Science, August 2016 (Paper II & III, Selected Questions)
Which of the following is not used in standard JPEG image compression?
AHuffman coding
BRun length encoding
CZig-zag scan
DK-L Transform
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Correct answer: (D) K-L Transform
Explanation
Standard JPEG uses the DCT, zig-zag scan, run-length encoding and Huffman coding. The K-L (Karhunen-Loeve) transform is not used in standard JPEG compression.
Q8UGC NET Computer Science, November 2017 (Paper II & III, Selected Questions)
Find the equation of the circle x² + y² = 1 in terms of x'y' coordinates, assuming that the xy coordinate system results from a scaling of 3 units in the x' direction and 4 units in the y' direction.
A3(x')² + 4(y')² = 1
B(x'/3)² + (y'/4)² = 1
C(3x')² + (4y')² = 1
D(1/3)(x')² + (1/4)(y')² = 1
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Correct answer: (B) (x'/3)² + (y'/4)² = 1
Explanation
Scaling by 3 units in x' and 4 units in y' gives x = x'/3 and y = y'/4. Substituting in x² + y² = 1 gives (x'/3)² + (y'/4)² = 1.
How to use these UGC NET Computer Science questions
Every question here was asked in a real UGC NET paper; the paper and shift are shown on the card, and the number opens the question on its own page. Try each one before tapping Show answer, then attempt the full UGC NET papers as timed tests to check your speed under exam conditions.