WB JECA MCA Computer Previous Year Questions (PYQs) – Page 26 of 26
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37.In Unix/Linux platform, which command is used to create a symbolic link?
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Solution
ln -sis used to create symbolic (soft) links in Linux.
38.In Unix/Linux platform, which command is used to view the inode number of a file?
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Solution
ls -idisplays the inode number of each file.
39.In Unix/Linux platform, which command is used to specify the access mode for files?
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Solution
chmodis used to change file permissions (read/write/execute).
40.In Unix/Linux platform, ______ command is used to show current running processes.
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Solution
psshows the list of currently running processes.
In singly linked list, the time complexity for insertion at a particular node is:
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Solution
Insertion after a given node in a linked list takes constant time
O(1)(if pointer to that node is already available).
In stack data structure, __________ operation is not permitted.
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Solution
Enqueue is a queue operation, not allowed in stack.
In tree data structure, the in-degree of root node is always __________.
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The root node has no incoming edges, so its in-degree is always 0.
In binary tree data structure, using depth-first approach, preorder traversal means _______.
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Solution
Preorder traversal visits root first, then left subtree, then right subtree.
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