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

Total Questions: 100

41. If universe of disclosure are all real number, then which of the following are true?

(A) ∃x ∀y (x + y = y)
(B) ∀x ∀y (((x ≽0) ∧ (y < 0)) → (x - y > 0))
(C) ∃x ∃y (((x ≼0) ∧ (y ≼ 0 )) ∧ (x - y > 0))
(D) ∀x ∀y ((x # 0) ∧ (y # 0) ↔ (xy # 0))
Choose the correct answer form the options given below:

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

42. If the universe of disclosure is set of integers, then which of the followings are TRUE?

Correct Answer: (b) (B) and (C) Only
Solution:

43. Answer the following question

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

44. The interface (S) that provide (S) I/O transfer of data directly to and from the memory unit peripheral is/are termed as:

(A) DMA (Direct Memory Access)
(B) IOP (Input- Output Processor)
(C) Serial Interface
(D) Parallel Interface
Choose the correct answer from the options given below :

Correct Answer: (c) (A) and (B) Only
Solution:

DMA (Direct Memory Access) is an interface that provides I/0 transfer of data directly to and from the memory unit and the peripheral. 'IOP (Input-Output Process) is a specialized processed designed to manage input and output operations in a Computer system. It handles tasks such as data transfer between peripheral devices and the CPU or memory.
So, the interface that provide I/0 transfer of data directly to and from the memory unit peripheral are termed as. DMA and IOP.

45. Which of the following (s) are main memory?

(A) Virtual memory
(B) Cache memory
(C) RAM
D) SSD
Choose the correct answer from the options given below :

Correct Answer: (b) (B) and (C) Only
Solution:

The main memory is the fundamental storage unit in a computer system. It is associatively large and quick memory and saves programs and information during computer operations. The technology that make the main memory work is base on semiconductor integrated circuits . It is also known as primary memory. RAM and cache memory is the main memory.

46. Which of the following are tautology?

(A) (P → (P ∧ Q)) → (P → Q)
(B) ((P → Q) → Q) → (P ∨ Q)
(C) ((P∨ ¬ P) → Q) → ((P∨ ¬ P) → R)
(D) (Q → (P∧ ¬ P)) → (R → (P∧ ¬ P))
Choose the correct answer from the options given below :

Correct Answer: (c) (A) and (B) Only
Solution:

A tautology is a statement that is always true regardless of the truth values of its of its components. for example-
(P → (P ∧ Q)) → (P → Q)
This statement is a tautology because it's always true.
((P → Q) → Q) → (P ∨ Q)
This statement is a tautology because it's always true.

47. Consider the three points P1(1, 2, 0), P2(3, 6, 2) and P3(2, 4, 6) and a view point C(0, 0, – 10).

(A) P1 obscure P2, if viewed from C.
(B) P2 obscure P1, if viewed from C.
(C) P3 does not obscure P1, if viewed from C.
(D) P2 does not obscure P3, if viewed from C.
Choose the correct answer from the options given below:

Correct Answer: (b) (A), (C) and (D) Only
Solution:

To determine which points obscure others from the viewpoint C, need to calculate the depth of each point relative to C. The depth can be computed using the distance formula.The smaller the depth value, the closer the point is to the viewer comparing the depth.
1. P1 is closer to C than P2. So, P1 obscure P2 from the viewpoint C.
2. P2 is farther to C than P1. so, P2 does not obscure P1 from the viewpoint C.
3. P3 is closer to C than P1. so, P3 does not obscure P1 from the viewpoint C.
4. P2 is farther to C than P3. so, P2 does not obscure P3 from the viewpoint C.
Thus, the statement (A), (C) and (D) are correct.

48. Which of the statement are CORRECT?

(A) Constructors are invoked automatically when the objects are created.
(B) Constructors do not have return types, not even void and therefore they cannot return values.
(C) Constructors cannot be inherited though a derived class can call the base class constructors.
(D) Constructors can be declared as virtual.
Choose the correct answer form the options given below :

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

A constructor in programming is a special type of method that is automatically called when the objects are created constructors do not have return types not even void and therefore they cannot return values. It cannot be inherited though a derived class can call the base class constructors. Constructors can not be declared as virtual.

49. Which one of the following statements are CORRECT?

(A) Granularity is the size of data item in a database.
(B) Two operations in a schedule are said to be conflict if they belong to same transaction.
(C) Two schedulers are said to be conflict equivalent if the order of any two conflicting operations is the same in both schedules.
(D) Write operations which are performed without performing the write operation are known as Blind Writes.
Choose the correct answer from the options given below.

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

Performing the writing operation (updation), without reading operation a such write operations is known as a blind writes. Hence, the statement (D) is incorrect and statement (A), (B) and (C) are correct.

50. Which of the following is/are NOT CORRECT statement?

(A) The first record in each block of the data file is known as actor record.
(B) Dense index has index entries for every search key value in the data file.
(C) Searching is harder in the B+ tree than B– tree as the all external nodes linked to each other.
(D) In extendible hashing the size of directory is just an array of 2d–1, where d is global depth. Choose the correct answer from the options given below:

Correct Answer: (b) (A), (C) and (D) Only
Solution:

(A)- In the data file, the first record of any of the block is called anchor record.
(B) Dense index has index entries for every search key value in the data file.
(C) In B⁺ tree, only the leaf nodes are linked together, not all external nodes (D) In extendible hashing the size of directory is just an array of 2ᵈ , where d is global depth So, the statements (A),(C) and (D) are not correct in the question.