U.G.C. NET Exam. December 2022 Paper II (COMPUTER SCIENCE) And Applicatation.

Total Questions: 100

41. Consider the following statements:

P: There exists no simple, undirected and connected graph with 80 vertices and 77 edges.
Q: All vertices of Euler graph are of even degree.
R: Every simple, undirected, connected and acyclic graph with 50 vertices has at least two vertices of degree one.
S: There exits a bipartite graph with more than ten vertices which is 2-colorable.
What is the number of correct statement among the above statements

Correct Answer: (d) 4
Solution:By graph theory

42. Consider the following statements:

A. There exists a Boolean algebra with '5' elements.
B. Every element of Boolean algebra has unique complement.
C. If a Lattice 'L' is a Boolean algebra then 'L' is not relatively complemented.
D. The direct product of two Boolean Algebras is also a Boolean algebra.
Choose the correct answer about the four statements given above.

Correct Answer: (b) Only B and D are correct
Solution:

Since each Boolean Algebra must have 2n element for some integer n.
So first statement in incorrect.

43. Which of the statement is not true in regards to virtual memory?

Correct Answer: (d) None of these
Solution:

Virtual Memory–
Virtual memory is a storage allocation scheme in which secondary memory can be addressed as though it were part of the main memory. The addresses a program may use to reference memory are distinguished from the addresses the memory system uses to identify physical storage sites and program-generated addresses are translated automatically to the corresponding machine addresses.
So all statement is correct.
So option(d) is correct.

44. Which of the following is/are true for Dynamic RAM (DRAM)?

A. It is slower than static RAM (SRAM)
B. Packing Density is higher than Static RAM (SRAM)
C. It is faster than static RAM(SRAM)
D. It requires data refreshing
Choose the correct answer from the options given below:  

Correct Answer: (a) A, B and D Only
Solution:

Difference Between static RAM and Dynamic RAM

45. Which of the following statement is/are false?

(A) The processor has direct access to both primary and secondary memory
(B) Primary memory stores the active instructions and data for the program being executed on the process
(C) Secondary memory is used as a backup memory
(D) Memory system is implemented on a single level memory
Choose the correct answer from the options given below :

Correct Answer: (d) A and D Only
Solution:

Primary memory can be accessed by the data bus where as secondary memory is accessed by 110 channels.
Primary memory data is directly accessed by the processing unit. Whereas secondary memory data cannot be accessed directly accessed by the processing unit.
In memory system
Level O : CPU registers
Level 1 : Cache memory
Level 2 : Main memory or primary memory
Level 3 : Magnetic disks or secondary memory
Level 4 : Optical disks or magnetic types tertiary memory.
So option (d) is correct.

46. Answer the following question

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

47. Which of the following lists defined in HTML share similar elements?

(A) Unordered lists              (B) Ordered lists
(C) Definition lists               (D) Correlated lists
(E) Enumerated lists
Choose the most appropriate answer from the options given below :

Correct Answer: (e) *
Solution:

HTML lists→are used to present list of information in well formed and semantic way. There are three different types of list in HTML and each one has a specific purpose and meaning.

48. What are the drawbacks of using file systems to store data?

(A) Data inconsistency
(B) Difficulty in accessing data
(C) Data isolation
(D) Atomicity of updates
Choose the correct answer from the options given below : 

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

Using the fill system to stone data has several drawbacks.

49. Which of the following database model, we have a parent-child relationship?

(A) hierarchical databases
(B) network databases
(C) relational databases
Choose the correct answer from the options below :   

Correct Answer: (a) A, B
Solution:

Hierarchical databases have a parent - child relationship. In a Hierarchical databases model, data is organized in a tree-like structure where each record or data element has a parent and can have multiple children.
Network database is similar to hierarchical databases but allow more flexible relationships between records. So option (a) is correct.

50. Identify the correct operation which produces that below given output based on two relations R1 and R2. R1

Correct Answer: (a) R1 ∩ R2
Solution:

Given two relation