Screening Test for recruitment to the post of ASSISTANT SYSTEM ENGINEER IN THE OFFICE OF THE DTE OF HR & TECHNICAL EDUATION — question paper

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Screening Test for recruitment to the post of ASSISTANT SYSTEM ENGINEER IN THE OFFICE OF THE DTE OF HR & TECHNICAL EDUATION

Paper #3113 · 21-09-2019 · 123 reviewed questions · Showing 81–120 of 123

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Complete original Series II question PDF, including its original figures and options. KSLC numbered study explanations cover all 150 positions in 6 source-reference sections. Independently worked KSLC answers, not an official key or student-suggested answers. 146 positions have a worked answer; 4 unresolved printed-choice items have explanations for later review. Best-effort source searches did not establish a matching official key. These sections accompany the original PDF and are not new individually auto-scoring MCQ cards. Examination: 21 September 2019 in the official source filename; recruitment cycle: not independently established from the booklet cover.

Given the C declarations int a = 4; int b = 6;, what value does a == b produce when printed using %d?
1. Prints 0
2. Prints 1
3. Compilation error
4. No output
In C, consider:
typedef char x[10];
x myarray[5];
Assuming each char occupies one byte, what value does sizeof(myarray) return?
1. 15 bytes
2. 10 bytes
3. 50 bytes
4. 30 bytes
Evaluate this C integer expression using standard precedence and left-to-right associativity for *, /, and %:
4 + 6 / 3 * 2 - 2 + 7 % 3
1. 3
2. 4
3. 6
4. 7
Consider the following declarations and assignments in standard C. Which statement correctly identifies the invalid assignments?
char *a, *b, c[10], d[10];
a = b;
b = c;
c = d;
d = a;
1. Only a = b is invalid
2. Only b = c is invalid
3. Both c = d and d = a are invalid
4. All four assignments are valid
In standard C, what is the result of this statement?
printf("%d", ++5);
1. It prints 5
2. It prints 6
3. It violates a language constraint; a diagnostic is required
4. It has undefined behavior only when executed
In Java, how many bytes does a value of the primitive type double occupy?
1. 4 bytes
2. 8 bytes
3. 16 bytes
4. The size varies by JVM or operating system
Let Root be a class and Branch a subclass of Root. If thisBranch refers to a Branch object, what is the value of the Java expression thisBranch instanceof Root?
1. True
2. False
3. It is a compile-time error
4. It throws an exception
Which Java package contains the StringTokenizer class?
1. java.io
2. java.util
3. java.lang
4. java.net
In Java, which method may be invoked by the garbage collector before reclaiming an object if the class overrides it? (Legacy finalization is deprecated and invocation is not guaranteed.)
1. A destructor method
2. A constructor
3. The finally block
4. finalize()
In process synchronization, what is a critical section (critical region)?
1. The code segment in which a process accesses shared data or a shared resource
2. An operating-system routine executed only during system startup
3. A block of main memory reserved exclusively for one process
4. A queue of processes waiting to be scheduled
Which set lists all four necessary conditions for deadlock (the Coffman conditions) in a resource-allocation system?
1. Mutual exclusion, hold-and-wait, no preemption, and circular wait
2. Mutual exclusion, preemption, circular wait, and starvation
3. Hold-and-wait, paging, no preemption, and circular wait
4. Mutual exclusion, hold-and-wait, deadlock prevention, and circular wait
What decision does a disk-scheduling algorithm make?
1. The order in which pending disk I/O requests are serviced
2. The order in which CPU processes are executed
3. The physical disk locations where files are stored
4. The directories in which files are organized
In virtual-memory management, what does the dirty bit for a page indicate?
1. The page contains corrupted data
2. The page is the wrong page for the process
3. The page has been modified since it was loaded from backing storage
4. The page is the least recently accessed page
In a typical process-state model, a process is blocked while waiting for an I/O operation. When the I/O completes, which state does it enter next?
1. Ready
2. Running
3. Suspended
4. Terminated
Which page-replacement policy can exhibit Belady’s anomaly, in which increasing the number of page frames can increase the number of page faults?
1. FIFO (First-In, First-Out)
2. Optimal replacement
3. LRU (Least Recently Used)
4. LFU (Least Frequently Used)
Which CPU-scheduling policy is commonly suited to interactive, time-sharing systems because it gives each ready process a turn for a fixed time quantum?
1. Round robin
2. First-come, first-served
3. Shortest job first
4. Non-preemptive priority scheduling
In Unix-like command-line usage, which command is not generally a filter that reads input data and produces transformed or selected output?
1. date
2. sort
3. cat
4. grep
Assuming the referenced parent directories exist, what does the command cd ../../.. do in a Unix-like shell?
1. Changes to the directory three levels above the current directory
2. Changes to the parent directory only
3. Leaves the current directory unchanged
4. It is invalid because cd accepts only one dot
In finite-state machines, how does output generation in a Moore machine differ from that in a Mealy machine?
1. A Moore machine’s output depends only on its current state; a Mealy machine’s output depends on its current state and current input
2. A Moore machine’s output depends on state and input; a Mealy machine’s output depends only on state
3. Both machines’ outputs depend only on the current state
4. A Moore machine’s output depends only on input; a Mealy machine’s output depends only on state
Which class of formal languages can a finite-state machine recognize?
1. Regular languages
2. Context-free languages only
3. Context-sensitive languages only
4. All recursively enumerable languages
The pumping lemma for regular languages is commonly used to prove that a language is:
1. Regular
2. Not regular
3. Context-free
4. Equivalent to a particular regular expression
Consider the context-free grammar
S → aB | bA
A → a | aS | bAA
B → b | bS | aBB
Which property holds for every terminal string generated from S?
1. It contains equal numbers of a and b
2. It contains exactly one more a than b
3. It contains exactly one more b than a
4. It always has odd length
Which grammar generates a language that no finite-state machine can recognize?
1. S → Sa | a
2. S → abX; X → cY; Y → d | aX
3. S → aSb | ab
4. S → a | b
Which operation is context-free languages (CFLs) not closed under? Here, “not closed” means that applying the operation to CFLs can produce a language that is not context-free.
1. Union
2. Kleene star
3. Complementation
4. Concatenation
A pushdown automaton with how many unbounded stacks can simulate a Turing machine?
1. No stack
2. One stack
3. Two stacks
4. Three or more stacks are required
Can any Turing machine decide, for every possible program and input, whether that program eventually halts on that input?
1. Yes, by simulating the program until it halts or repeats
2. No; the general halting problem is undecidable
3. It is an open problem in computer science
4. It depends only on the programming language
Using the POSIX expr utility in a Unix-like shell, which command reports an error because it attempts division by zero?
1. expr 4 + 5
2. expr 9 - 3
3. expr 2 \* 3
4. expr 7 / 0
Assume each logged-in terminal appears as one line in who output. If 7 terminals are logged in, what does this shell command display?
date; who | wc -l
1. The current date/time, followed by 7
2. The current date/time, followed by 8
3. The current date/time, followed by 1
4. An error message
When mv renames a file within the same filesystem, what does it primarily change?
1. The directory entry (name/path); the file’s inode and contents remain the same
2. The file’s contents and inode number
3. Only the inode number, without changing the directory entry
4. Only the file’s permission bits
A relation is in 1NF, and every non-prime attribute is fully functionally dependent on each candidate key (there is no partial dependency on a proper subset of a candidate key). What is the highest normal form guaranteed by this condition?
1. First normal form (1NF)
2. Second normal form (2NF)
3. Third normal form (3NF)
4. Boyce–Codd normal form (BCNF)
In the Chen notation for an entity–relationship (E–R) diagram, what do ellipses (ovals) represent?
1. Entity sets
2. Relationships
3. Attributes
4. Connections between diagram symbols
A data model is a collection of concepts used to describe which aspects of a database?
1. Data and data relationships only
2. Data semantics and consistency constraints only
3. Data, data relationships, data semantics, and consistency constraints
4. None of the above
In conceptual database design, entity–relationship (E–R) modeling is generally considered which approach?
1. Top-down
2. Bottom-up
3. Left-to-right
4. None of the above
When a foreign key in a child table references the primary key of a parent table, what relationship does this establish?
1. A referential parent–child link, typically supporting a one-to-many relationship
2. A many-to-many relationship without an intermediate table
3. A network-model connection between the tables
4. A relationship that prevents the parent row from having multiple children
A weak entity is identified using the key of an owner entity together with its own partial key. What is the usual cardinality from the owner entity to the weak entity?
1. One-to-one
2. One-to-many
3. Many-to-many
4. No identifying relationship is required
Under a standard shared/exclusive locking protocol, assume no conflicting lock request is queued. Transaction A holds a shared lock S(R). Transaction B requests S(R). What happens?
1. B is granted the shared lock immediately because shared locks are compatible
2. B is rejected because R is already locked
3. B must wait until A releases its shared lock
4. The two transactions enter a deadlock
In Oracle SQL, what result set does this query return?
SELECT 'Hi' FROM DUAL WHERE 1 = NULL;
1. One row containing Hi
2. One row containing FALSE
3. One row containing TRUE
4. An empty result set
Which join matches rows from two tables using an equality condition between their columns?
1. Non-equijoin
2. Self-join
3. Equijoin
4. Outer join
Under standard SQL logical-operator precedence, in what order are NOT, AND, and OR evaluated when parentheses do not override it?
1. NOT first, then AND, then OR
2. NOT first, then OR, then AND
3. AND first, then OR, then NOT
4. In the order the operators appear
Consider the grammar over {a, b}:
S → aSa | bSb | a | b
Which language does it generate?
1. All palindromes over {a, b}, of both odd and even lengths
2. All odd-length palindromes over {a, b}
3. All strings whose first and last symbols are equal
4. All even-length palindromes over {a, b}

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