## UGC NET Computer Science Solved Paper -II Dec2010

1. The number of integers between 1 and 250 that are divisible by 2, 5 and 7 is

(A) 2 (B) 3 (C) 5 (D) 8

2. An undirected graph possesses an eulerian circuit if and only if it is connected and its vertices are

(A) all of even degree

(B) all of odd degree

(C) of any degree

(D) even in number

3. A partially ordered set is said to be a lattice if every two elements in the set have

(A) a unique least upper bound

(B) a unique greatest lower bound

(C) both (A) and (B)

(D) none of the above

4. The minimum number of edges in a connected graph with ‘n’ vertices is equal to

(A) n (n – 1)

(B) n (n – 1)/2

(C) n2

(D) n – 1

5. Consider the problem of connecting 19 lamps to a single electric outlet by using extension cords each of

which has four outlets. The number of extension cords required is

(A) 4 (B) 5 (C) 6 (D) 7

6. The decimal number equivalent of (4057.06)8 is

(A) 2095.75

(B) 2095.075

(C) 2095.937

(D) 2095.0937

7. **AB +**(A+ B) is equivalent to

(A) AÅ B

(B) A☉B

(C) (AÅB)☉A

(D) (A☉B)ÅA

Explanation:

Hint: http://en.wikipedia.org/wiki/Logic_gate#Symbols

8. An astable multivibrator has

(A) one stable state

(B) two stable states

(C) no stable states

(D) none of these

9. 12-bit 2’s complement of –73.75 is

(A) 01001001.1100

(B) 11001001.1100

(C) 10110110.0100

(D) 10110110.1100

10. Encoding of data bits 0011 into 7-bit even Parity Hamming Code is

(A) 0011110

(B) 0101110

(C) 0010110

(D) 0011100

11. How many of the following declarations are correct ?

int z = 7.0;

double void = 0.000;

short array [2] = {0, 1, 2};

char c = “\n”;

(A) None

(B) One is correct

(C) Two are correct

(D) All four are correct

Hint: Void is keyword, array[2] cannot hold 3 values, “” cannot be used in char

12. The value of the following expression (13 / 4 * 3) % 5 + 1 is

(A) 5.75

(B) 2.95

(C) 1.4875

(D) 5

13. Which one of the following will set the value of y to 5 if x has the value 3, but not otherwise ?

(A) if (x = 3) y = 5

(B) if x = = 3 (y = 5)

(C) if (x = = 3); y = 5

(D) if (x = = 3) y = 5

14. Which one of the following sentences is true ?

(A) The body of a while loop is executed at least once.

(B) The body of a do … while loop is executed at least once.

(C) The body of a do … while loop is executed zero or more times.

(D) A for loop can never be used in place of a while loop.

15. “Black” refers in the “Black-box” testing means

(A) Characters of the movie “Black”

(B) I – O is hidden

(C) Design is hidden

(D) Users are hidden

16. In generalisation, the differences between members of an entity is

(A) maximized

(B) minimized

(C) both (A) & (B)

(D) None of these

17. The dependency preservation decomposition is a property to decompose database schema D, in which each functional dependency X ® Y specified in F,

(A) appeared directly in one of the relation schemas Ri in the decomposed D.

(B) could be inferred from dependencies that appear in some Ri.

(C) both (A) and (B)

(D) None of these

18. Which of the following is an optimistic concurrency control method ?

(A) Validation based

(B) Time stamp ordering

(C) Lock-based

(D) None of these

19. Optical storage is a

(A) high-speed direct access storage device.

(B) low-speed direct access storage device.

(C) medium-speed direct access storage device.

(D) high-speed sequential access storage device.

20. Which of the following is the process by which a user’s access to physical data in the application is

limited, based on his privileges ?

(A) Authorization

(B) Authentication

(C) Access Control

(D) All of these

21. What is the maximum number of nodes in a B-tree of order 10 of depth 3 (root at depth 0) ?

(A) 111

(B) 999

(C) 9999

(D) None of the above

Hint: ((m^h) -1 /m-1) where m=order and h=depth : to find the maximum number of nodes

22. A binary tree with 27 nodes has _______ null branches.

(A) 54

(B) 27

(C) 26

(D) None of the above

Hint: null branches = n+1 nodes

23. The time complexity to build a heap of n elements is

(A) 0(1)

(B) 0(lgn)

(C) 0(n)

(D) 0(nlgn)

24. Linear probing suffers from a problem known as

(A) Secondary clustering

(B) Primary clustering

(C) Both (A) and (B)

(D) None of these

25. Which of the following can be the sequence of nodes examined in binary search tree while searching for key 88 ?

(A) 90, 40, 65, 50, 88

(B) 90, 110, 80, 85, 88

(C) 190, 60, 90, 85, 88

(D) 65, 140, 80, 70, 88

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