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## Solved Questions Paper-2 UGC-NET Computer Science November 2017

 21. Consider an array representation of an n element binary heap where the elements are stored from index 1 to index n of the array. For the element stored at index i of the array (i< = n), the index of the parent is: A. floor ((i +1)/2) B. ceiling ((i + 1)/2) C. floor (i/2) D. ceiling (i/2) View/Hide Ans Explanation 22. The following numbers are inserted into an empty binary search tree in the given order: 10, 1, 3, 5, 15, 12, 16. What is the height of the binary search tree? A. 3 B. 4 C. 5 D. 6 View/Hide Ans Explanation 23. Let G be an undirected connected graph with distinct edge weight. Let Emax be the edge with maximum weight and Emin the edge with minimum weight. Which of the following statements is false? A. Every minimum spanning tree of G must contain Emin. B. If Emax is in minimum spanning tree, then its removal must disconnect G. C. No minimum spanning tree contains Emax. D. G has a unique minimum spanning tree. View/Hide Ans Explanation 24. A list of n strings, each of length n, is sorted into lexicographic order using merge - sort algorithm. The worst case running time of this computation is: A. O(n log n) B. O(n2 log n) C. O(n2 + log n) D. O(n3) View/Hide Ans Explanation 25. Postorder traversal of a given binary search tree T produces following sequence of keys: 3, 5, 7, 9, 4, 17, 16, 20, 18, 15, 14 Which one of the following sequences of keys can be the result of an in-order traversal of the tree T? A. 3, 4, 5, 7, 9, 14, 20, 18, 17, 16, 15 B. 20, 18, 17, 16, 15, 14, 3, 4, 5, 7, 9 C. 20, 18, 17, 16, 15, 14, 9, 7, 5, 4, 3 D. 3, 4, 5, 7, 9, 14, 15, 16, 17, 18, 20 View/Hide Ans Explanation 26. Which of the following devices takes data sent from one network device and forwards it to the destination node based on MAC address? A. Hub B. Modem C. Switch D. Gateway View/Hide Ans Explanation 27. .................. do not take their decisions on measurements or estimates of the current traffic and topology. A. Static algorithms B. Adaptive algorithms C. Non - adaptive algorithms D. Recursive algorithms View/Hide Ans Explanation 28. The number of bits used for addressing in Gigabit Ethernet is ................... A. 32 bits B. 48 bits C. 64 bits D. 128 bits View/Hide Ans Explanation 29. Which of the following layer of OSI Reference model is also called end-to-end layer? A. Network layer B. Data link layer C. Session layer D. Transport layer View/Hide Ans Explanation 30. The IP address ................... is used by hosts when they are being booted. A. 0.0.0.0 B. 1.0.0.0 C. 1.1.1.1 D. 255.255.255.255 View/Hide Ans Explanation

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