U.G.C. NET Exam. June 2023 Paper-II (COMPUTER SCIENCE)

Total Questions: 100

81. In the standard Ethernet with transmission rate of 10 Mbps, assume that the length of the medium is 2500m and size of a frame is 512 bytes. The propagation speed of a signal in a cable is normally 2 × 10³ m/s. The transmission delay and propagation delay are

Correct Answer: (b) 51.2 µs and 12.5
Solution:

82. Consider the following statements.

A. The identity is unique in any monoid
B. A monoid is a group if there exists inverse of each element of monoid
C. Semi group has closure, associative and identify properties
D. Quasi group has closure property
Choose the correct answer from the options given below.

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

Analyze each statements:
(A) In any monoid, there exists a unique identity element. This element is such that when combined with any other element in the monoid, it leaves the other element unchanged. So, the statement (A) is correct.
(B) A monoid is indeed a group if there exists an in verse for each element of the monoid. This is one of the defining properties that distinguishes a monoid from a group so, the statement (B) is correct.
(C) A semigroup only needs to have closure and associativeity properties. The property of identity is not necessary for a structure to be considered a semigroup. So, the statement (C) is incorrect.
(D) Quasi- groups do have the closure property. This means that for any two elements in the set, their operation results in another element that is also in the set, So, the statement (D) is correct.

83. What is the output of following code?

main ()
{static float a[ ] = {13, 24, 1.5, 4.5, 5.4, 3.5}
float *j, *k;
j = a;
k = a + 4
j = j *2;
k = k/2
printf ("%f%f', *j, *k); }

Correct Answer: (d) lllegal use of pointer in main function
Solution:

Given code has several syntax errors. The code indeed contains illegal use of pointers in the 'main ()' function. Specifically, the lines j = j * 2; and 'k = k/2; are attempting to perform arithmetic operations directly on pointer variables, which is not allowed in C.

84. If A = {4n + 2 n is natural number} and B = {3n n is a natural number}. Which of the following is correct for A ∩ B?

Correct Answer: (d) {12n – 6 n is a natural number}
Solution:

85. Match List I with List II


Choose the correct answer from the option given below :

Correct Answer: (b) A-IV B-III C-II D-I
Solution:

86. Given below are two statements:

Correct Answer: (b) Both Statement I and Statement II are incorrect
Solution:

87. 256 Mb DRAM is organized as a 32 M × 8 memory externally and as a 16K × 16K square array internally. Each row must be refreshed at least once every 50 mili second to forestall loss of data: refreshing one row takes 100 nanoseconds. What fraction of the total memory bandwidth is lost to refresh cycles?

Correct Answer: (b) 3.3%
Solution:

88. Given below are two statements:

Statement I: subsystem models show logical grouping of objects into coherent subsystem Statement II: State machine models show how objects change their states in response to events.
In the light of the above statements, choose the most appropriate from the options given below:

Correct Answer: (a) Both Statement I and Statement II are correct
Solution:

Subsystem models help organize objects into meaningful groups within a larger system, making it easier to understand and manage complex systems state machine models are a powerful way to illustrate the behavior of objects within a system by defining the states they can be in and the transitions between those states triggered by events. So, the both statement I and II are correct.

89. Given below are two statement; one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: It is possible to create doubly linked list using only one Pointer with every node. Reason R: By storing the XOR of the addresses of the previous and next nodes.
In the light of the above statement. choose the most appropriate answer from the option given below.

Correct Answer: (a) Both A and R are true and R is the correct explanation of A
Solution:

Assertion A and Reason R are true and Reason R is the correct explanation of Assertion A. Storing the XOR of the addresses of the previous and next nodes allows traversal in both directions using a single pointer, enabling the creation of a doubly linked list with one pointer per node.

90. The compiler for high level language that runs on one machine and produces code for other machine is called-

Correct Answer: (a) Cross compiler
Solution:

A cross compiler is a compiler capable of creating executable code for a platform other than the one on which the complier is running, for example, a compiler that runs on a PC but generates code that runs or Android devices is a cross compiler.