GATE CSE MCQ, MSQ and NAT Questions

GATE CSE MCQ, MSQ and NAT Questions: Computer Science and Information Technology (CS) is one of the most opted and difficult papers to pass in the GATE examination. Therefore, preparing the syllabus thoroughly is not enough to crack the exam; you must dedicate much of your time to practice several MCQ, MSQ and NAT questions to score the GATE 2025 cutoff for CS. GATE CSE 2025 question paper will have Engineering Mathematics, General Aptitude, and core CS sections. There will be 10 General Aptitude questions of 15 marks, 10 Engineering Mathematics questions of 13 marks, and 45 Computer Science and Information Technology questions of 72 marks. The GATE 2025 exam will have a total of 65 questions carrying 100 marks. To get 85+ marks in this paper, you must solve GATE CSE MCQ questions from key chapters, like Theory of Computation, Digital Logic, Algorithms and Operating Systems etc. Besides, since a portion of the paper will have numerical based questions, you must practice GATE CSE NAT questions to analyze your overall preparation and work on your mistakes. In this article, we have listed the most expected and important GATE MCQ, MSQ and NAT questions for Computer Science & Information Technology based on the past years' paper trends. 

Also Read: GATE 2025 Computer Science & Information Technology: Exam Date (Feb 1), Syllabus, Question Papers, Pattern, Cutoff

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Most Important GATE CSE MCQ, MSQ and NAT Questions

GATE CS exam will have NAT, MSQ, and MCQ-type questions as per the GATE 2025 exam pattern. You must gain expertise in solving numerical questions and at the same time have a proper understanding of theoretical concepts to attempt MCQ and MSQ. Solve these important questions of GATE CSE MCQ questions to improve your exam preparation. We have taken these important questions from the GATE previous year question papers and solutions PDF. 

Theory of Computation

Q1- Which of the following statements is/are CORRECT?

A- The intersection of two regular languages is regular.

B- The intersection of two context-free languages is context-free.

C- The intersection of two recursive languages is recursive.

D- The intersection of two recursively enumerable languages is recursively enumerable.

Answer- Options A, C, and D are correct

Q2- Context-free languages and regular languages are both closed under the operation(s) of :

A- Union

B- Intersection

C- Concatenation

D- Complementation

Answer- Options A and C are correct

Operating Systems

Q3- Consider a process P running on a CPU. Which one or more of the following events will always trigger a context switch by the OS that results in process P moving to a non-running state (e.g., ready, blocked)?

A- P makes a blocking system call to read a block of data from the disk

B- P tries to access a page that is in the swap space, triggering a page fault

C- An interrupt is raised by the disk to deliver data requested by some other process

D- A timer interrupt is raised by the hardware

Answer- A and B are correct

Q4- Consider the following five disk access requests of the form (request id, cylinder number) that are present in the disk scheduler queue at a given time.

(P, 155), (Q, 85), (R, 110), (S, 30), (T, 115)

Assume the head is positioned at cylinder 100. The scheduler follows Shortest Seek Time First scheduling to service the requests.

Which one of the following statements is FALSE?

A- The head reverses its direction of movement between servicing of Q and P.

B- T is serviced before P.

C- R is serviced before P.

D- Q is serviced after S, but before T.

Answer- Option D is correct

Algorithms

Q5- Which of the following statements are TRUE?

1. The problem of determining whether there exists a cycle in an undirected graph is in P.

2. The problem of determining whether there exists a cycle in an undirected graph is in NP.

3. If problem A is NP−Complete, there exists a non-deterministic polynomial time algorithm to solve A.

A- 1 , 2 and 3

B- 1 and 2 only

C- 2 and 3 only

D- 1 and 3 only

Answer- Option A is correct

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Q6- The Floyd-Warshall algorithm for all-pair shortest paths computation is based on

A- Greedy paradigm

B- Divide-and-Conquer paradigm

C- Dynamic Programming paradigm

D- neither Greedy nor Divide-and-Conquer nor Dynamic Programming paradigm

Answer- Option D is correct

Digital Logic

Q7- Consider a 4-bit Johnson counter with an initial value of 0000. The counting sequence of this counter is:

A- 0, 1, 3, 7, 15, 14, 12, 8, 0

B- 0, 1, 3, 5, 7, 9, 11, 13, 15, 0

C- 0, 2, 4, 6, 8, 10, 12, 14, 0

D- 0, 8, 12, 14, 15, 7, 3, 1, 0

Answer- Option D is correct

Q8- In 16-bit 2's complement representation, the decimal number -28 is:

A- 1000 0000 1110 0100

B- 0000 0000 1110 0100

C- 1111 1111 1110 0100

D- 1111 1111 0001 1100

Answer- Option C is correct

Database Management Systems

Q9- Consider the following two statements about database transaction schedules:

I. Strict two-phase locking protocol generates conflict serializable schedules that are also recoverable.

II. Timestamp-ordering concurrency control protocol with Thomas Write Rule can generate view serializable schedules that are not conflict serializable.

Which of the above statements is/are TRUE?

A- Both I and II

B- I only

C- II only

D- Neither I nor II

Answer- Option A is correct

Q10- Which of the following file organizations is/are I/O efficient for the scan operation in DBMS?

A- Sorted

B- Heap

C- Unclustered tree index

D- Unclustered hash index

Answer- Options A and B are correct

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You can score good marks in Computer Science and Information Technology if you study the complete GATE 2025 syllabus PDF without skipping out any chapters or topics. Solving GATE previous year questions papers, GATE 2025 mock tests, sample papers, test series, and important questions is very essential for you. Previous year GATE exam toppers give a lot of emphasis on solving questions to gain a better understanding of concepts and judge your preparation. After finishing the syllabus focus on revision and solving previous year papers and mock tests.

We wish you all the best for your exam.

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