WB JECA MCA 2024 Previous Year Questions (PYQs) – Page 6 of 8
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Showing 78 questions
Which is the correct statement about operator overloading ?
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Solution
Solution: Overloading changes operator meaning for user types, but its precedence and associativity never change.
Answer: (D)
Answer: (D)
Numbers 7, 5, 1, 8, 3, 6, 0, 9, 4, 2 are inserted in that order into an initially empty binary search tree. The tree uses usual ordering. What is the in-order traversal sequence?
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Solution
Solution: In-order traversal of a BST gives the sorted order of keys ⇒ 0 to 9 ascending.
Answer: (C) 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
Answer: (C) 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
Which of the following is popular for applications such as storage of log files in a DBMS since it offers the best write performance ?
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Solution
Solution: RAID 0 (striping) provides maximum write throughput (no redundancy), often used for logs/temp data.
Answer: (A) RAID level 0
Answer: (A) RAID level 0
Which of the following statement is correct ?
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Solution
Solution: For a BST, only in-order traversal yields the keys in sorted order.
Answer: (B)
Answer: (B)
Which one of the following is deadlock avoidance algorithm ?
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Solution
Solution: Banker's algorithm checks for safe state to avoid deadlocks.
Answer: (B)
Answer: (B)
Which command is used to set the three permissions for all the three categories of users of a file ?
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Solution
Solution:
Answer: (C) chmod
chmod sets read/write/execute bits for user, group, others (e.g., chmod 744 file).Answer: (C) chmod
Which command is used for printing the current working directory ?
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Solution
Solution: The Unix command to print the current directory is
Answer: (D) pwd
pwd.Answer: (D) pwd
When several processes access the same data concurrently and the outcome depends on the particular order in which the access takes place is called ________.
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Solution
Solution: Order-dependent outcomes from concurrent access is a classic race condition.
Answer: (A) Race condition
Answer: (A) Race condition
Baud means
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Solution
Solution: Baud = number of signal changes per second, not bits/bytes directly.
Answer: (C)
Answer: (C)
Which option will be used with sort command to start sorting after the n-th column of the (m+1)th field ?
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Solution
Solution: The Unix sort option to specify starting column is
Answer: (B)
+m -n.Answer: (B)
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