U.G.C. NET Exam. June, 2020 Paper II (COMPUTER SCIENCE & APPLICATIONS)

Total Questions: 100

41. Which of the following are applications of symbol table ?

(A) Storage allocation
(B) Checking type compatibility
(C) Suppressing duplicate error massages
Choose the correct answer from the option given below 

Correct Answer: (d) (A), (B) and (C)
Solution:

Storage allocation -
• Checking type compatibility.
• Suppressing duplicate error massages.
The symbol table is a data structure that contains a record for each identifier, along with its attribute such as type, initial value scope a lifetime.

42. Simplified expression's for following Boolean function

F (A, B, C, D) = ∑(0, 1, 2, 3, 6, 12, 13, 14, 15)is/are
(A) A'B' + AB A'C'D'
(B) A'B' + AB + A' CD'
(C) A'B' + AB + BC'D'
(D) A'B' + AB + BCD'
Choose the correct answer the from the option's given below. 

Correct Answer: (d) (B) and (D) only
Solution:

F (A, B, C, D) = ∑(0, 1, 2, 3, 6, 12, 13, 14, 15)
Two k-maps can be constructed from the given Boolean function.

The expression for k-map is AB + A'B' + A' CD'.
The expression for k-map is AB + A'B' + BCD'

43. Which of the following statements with respect to K-segment pipelining are true ?

(A) Maximum speedup that a pipeline can provide is k theoretically.
(B) It is impossible to achieve maximum speedup k in k-segment pipeline.
(C) All segments in pipeline take same time in computation.
Choose the correct answer from the options given below:

Correct Answer: (a) (A) and (B) only
Solution:

Statements B true- k× efficiency = speedup
The speedup cannot be equal to k till efficiency become
1 and in real time environment efficient cannot become
1 of many reasons like the delay at intermediate buffer
different time taken by different segments to perform
their sub-operations which cause all other segments to
waste time while waiting for the next clock.
Statement C False : Because different segment can take
different times to complete their sub operations. Hence
the correct answer is (A) and (B) only.

44. Which of the following statements with respect to multiprocessor system are true ?

(A) Multiprocessor system is controlled by one operating system.
(B) In Multiprocessor system multiple computers are connected by the means of communications lines.
(C) Multiprocessor system is classified as multiple instruction stream and multiple data stream system.
Choose the correct answer from the options given below: 

Correct Answer: (c) (A) and (C) only
Solution:

A multiprocessor is a computer System having two or more processing units. multiple processors each Sharing main memory and Peripherals in order to Simultaneously Process programs.
• multiprocessor System are Controlled by are or more operating systems. Hence Statements I is correct.
• in a multiprocessor system, multiple Processors are Connected Under single Computer System. Hence Statement II is incorrect.
• Multiprocessor System is classified us multiple Instruction streams and multiple data streams system.
Hence statement III is correct. ⇒
Correct option is c (A) and (C) only

45. Which of the following statements regarding XML is/are True?

(A) XML is a set of tags designed to tell browsers how to display text and images in a web page. (B) XML defines a syntax, for representing data, but the meaning of data varies from application, to application.
(C) < Letter>, < LETTER > and < letter > are three different tags is XML.
Choose the correct answer from the options given below: 

Correct Answer: (c) (B) and (C) only
Solution:

• XML was created with the aim of transporting data with an emphasis on what data is.
• HTML was developed with the intention of presenting data with an emphasis on how it appears.
Statement B: TRUE:-
While XML Specifies a syntax for representing the meaning of data varies by application.
Statements C : TRUE
XML is case sensitive and Hence , and < letter> are three different tags in XML
Statement :- A: FALSE:
HTML is a collection of tags that tell web browsers How to view text and Images on website.

46. In the context of 3D computer graphics which of the following statements is/are correct?

(A) Under perspective, projection, each set of parallel lines in the object do not stay parallel in the image (except those that are parallel to the viewplane to start with).
(B) Applying a perspective, transformation in the graphics pipeline to a vertex involves dividing by its 'z' coordinate.
(C) Perspective transformation is a linear transformation.
Choose the correct answer form the options given below: 

Correct Answer: (a) (A) and (B) only
Solution:

Under perspective projection, Each set of Parallel Lines in the object do not stay parallel in the image. The Lines Converge to the middle of the Projection at a single points. points of Intersection of Converging line with the screen plane generate the projected Image on the Screen.
Hence statement I is correct.
• Appling a perspective transformation in the graphics Pipeline to a vertex involves dividing by its' 'z' Coordinate.
Hence statement II is correct.
• perspective transformation is a non- Linear transformation. Hence statement III is incorrect.

47. Concerning phong shading and Gouraud shading in a 3D scene, which of the following statements are true?

(A) Gouraud shading requires more computation than phong shading.
(B) Gouraud shading linearly interpolates the color of an interior pixel from the color at the vertices.
(C) Phong shading interpolates over the normal vectors specified at the vertices.
Choose the correct answer from the options given below:

Correct Answer: (c) (B) and (C) only
Solution:

Statement 1: FALSE:-
Gouraud Shading requires less calculation and this greatly decreases the cost of shading steeply.
Statement - 3 Q True :- Phong Shading Interpolates over the normal vector specified at the vertices.
Statement - 2 :- TRUE :-
Gouraud Shading Linearly interpolates the color of an interior pixel from the color at the vertices the original is a linear interpolation of Colour between vertices, Specifically.

48. In the context of concurrency control, a given pair of operations in a schedule is called conflict schedule if

(A) At least one of the operations is write operation.
(B) Both the operations are performed on the same data item.
(C) Both the operations are performed by different transactions.
(D) Both the operations are performed on different data items.
Choose the correct answer from the options given below:

Correct Answer: (b)(A), (B) and (C) only
Solution:

(a) item X has an incorrect value because its update by
T1 is lost (over written)

49. Software reliability is described with respect to

(A) Execution Time
(B) Calendar Time
(C) Clock Time
Choose the correct answer from the options given below:

Correct Answer: (c) (A), (B) and (C)
Solution:

The Execution time of a programme is the time that a processor spends actually executing the programs instructions.
• The second kind of time is calendar time it is the familiar time that we normally experience.
• Clock time is the normal wall clock time.
• and software reliability is described with respect to all these.

50. To create an object-behavioral model, the analyst performs the following steps:

(A) Evaluates all use-cases.
(B) Builds state transition diagram for the system.
(C) Reviews the object behaviour model to verify accuracy and consistency.
(D) Identifies events that do not derive the interactions sequence.
Choose the correct answer from the options given below: 

Correct Answer: (a) (A), (B) and (C) only
Solution:

The behavioral model indicates how the Software will respond to external events. To create the model. the analyst must perform the following steps
1. Evaluate all use - cases to fully understand the sequence of interaction within the system
2. Create a sequence for each use - case
3. Build a state diagram for the system.
4. Review the behavioral model to verify accuracy and Consistency.