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1 | Question Link | Subject | Concept Tested | Reason For Failure | Remarks | |||||||||||||||||||||

2 | https://gateoverflow.in/333232/GATE2020-CS-GA-9 | Numerical Aptitude | Coordinate Geometry | Second-guessing answer | I unselected the answer after I had selected 90 degrees because I was unable to visualize. The correct answer came to my mind after the exam. Exam panic. | |||||||||||||||||||||

3 | https://gateoverflow.in/333235/GATE2020-CS-GA-6 | Verbal Aptitude | Comprehension and Inference | Overthinking? | I am still not sure if GO answer is correct. I selected "GST is imposed on production of goods" which is closest to "supply". "Destination-based" does not directly imply "at point of usage" - point of usage would mean at point of sale, because that's where the goods are actually "used". Destination could be the seller. | |||||||||||||||||||||

4 | https://gateoverflow.in/333206/GATE2020-CS-25 | Computer Networks | Application-Layer Protocols | Second-guessing answer | I had initially written 6 but thought that the question is a trick. There wasn't any trick and I paid the price. | |||||||||||||||||||||

5 | https://gateoverflow.in/333228/GATE2020-CS-3 | Computer Organization | Interrupts | Silly mistake | Polling is obviously when CPU checks status bits periodically. It's clear as day, yet somehow I was blind during the exam. | |||||||||||||||||||||

6 | https://gateoverflow.in/333220/GATE2020-CS-11 | Operating Systems | Memory Management | Silly mistake | Obviously best fit's hole is the smallest of the lot, that's why it is best fit. Again, I was blind during exam. Probably because I was trying to move fast. (exam panic) | |||||||||||||||||||||

7 | https://gateoverflow.in/333209/GATE2020-CS-22 | C Programming | Pointers + Arrays + Output | Conceptual weakness | I had particular weakness with multidimensional arrays and pointer-to-pointers. | |||||||||||||||||||||

8 | https://gateoverflow.in/333210/GATE2020-CS-21 | Computer Organization | Cache Memory | Silly mistake | Miscalculated somewhere in the answer. Question is pretty easy. | |||||||||||||||||||||

9 | https://gateoverflow.in/333177/GATE2020-CS-54 | Databases | B+trees and indexing | Did not attempt | Due to lack of time and being unable to remember the concept. This is a question straight out of Navathe, I had not practiced it (had practiced B+tree operations and multilevel indexing very well but missed out on this. | |||||||||||||||||||||

10 | https://gateoverflow.in/333187/GATE2020-CS-44 | Computer Organization | Instruction Formats and Addressing | Conceptual weakness | Attempted the numerical as if it was an expanding opcode numerical. Obviously it is not, I mixed up concepts in time limit. | |||||||||||||||||||||

11 | https://gateoverflow.in/333190/GATE2020-CS-41 | Algorithms | Binary Search Trees | Conceptual weakness but unknown algorithm | I don't think I could have gotten this right anyway. Maybe should not have selected the option because I was unsure. Atleast would not get negative marking. | |||||||||||||||||||||

12 | https://gateoverflow.in/333191/GATE2020-CS-40 | Graph Theory | Minimum Spanning Trees | Did not attempt | Had practiced a lot of MST questions but not sure if this one was doable keeping the time limit in mind. | |||||||||||||||||||||

13 | https://gateoverflow.in/333189/GATE2020-CS-42 | Permutations/Combinations | Derangement with repetition | Incorrect method | Used derangement formula and divided by 2 (formula was also wrong). Should have solved this the normal way, by selecting letters in each position. | |||||||||||||||||||||

14 | https://gateoverflow.in/333192/GATE2020-CS-39 | Propositional Logic | Validity of formulae | Forgot concept | Forgot the concept during the exam (exam panic). If I had kept calm I could've done this. | |||||||||||||||||||||

15 | https://gateoverflow.in/333186/GATE2020-CS-45 | Probability | Basic probability | Second-guessing answer | I was solving correctly, but messed up at the last moment and wrote 1. | |||||||||||||||||||||

16 | https://gateoverflow.in/333201/GATE2020-CS-30 | Computer Organization | Cache Memory | Silly mistake | I had the right answer in the scribble pad! Exam panic again. | |||||||||||||||||||||

17 | https://gateoverflow.in/333178/GATE2020-CS-53 | Operating Systems | Paging and TLB | Conceptual calculation mistake? | Not sure what I did wrong in this one. My answer is 155. Some GO commenters say 155 but majority of them say 700+. | |||||||||||||||||||||

18 | https://gateoverflow.in/333202/GATE2020-CS-29 | Digital Logic | IEEE Representation | Did not attempt | Did not try due to time slipping away. Forgot some of the concept also due to exam panic. Could've done this. | |||||||||||||||||||||

19 | https://gateoverflow.in/333200/GATE2020-CS-31 | Algorithms | Spanning Tree algorithms | Silly mistake | I am not sure if the answer should be O(V), O(E + V) or O(ElogV), I selected the last one. I did not spend too much time thinking on this question - just knew that need to check minimum weight property plus ensure no cycle and the best way to do that is to just reapply the MST algorithm(s). | |||||||||||||||||||||

20 | https://gateoverflow.in/333197/GATE2020-CS-34 | Operating Systems | Process Synchronization | Did not attempt | Due to lack of time. Question was definitely doable. Had solved many semaphore questions earlier. | |||||||||||||||||||||

21 | https://gateoverflow.in/333183/GATE2020-CS-48 | C Programming | Function Output | Silly mistake | Some calculation mistake somewhere, answer is definitely 81 but I got 27. | |||||||||||||||||||||

22 | https://gateoverflow.in/333188/GATE2020-CS-43 | Computer Organization | Pipelining | Did not attempt | Due to lack of time and lots of data in the question, so did not bother trying. Was doable, had solved questions like this speedup one earlier. | |||||||||||||||||||||

23 | https://gateoverflow.in/333199/GATE2020-CS-32 | Theory of Computation | Checking if CFL | Conceptual weakness | I wasn't able to get the second one right - I thought it's a CSL. Spent some time thinking but did not arrive at the correct answer. Clearly it is a CFL. | |||||||||||||||||||||

24 | https://gateoverflow.in/333193/GATE2020-CS-38 | Computer Networks | CIDR Assignment | Did not attempt | Lack of time. Could have solved. Forgot the concept | |||||||||||||||||||||

25 | https://gateoverflow.in/333181/GATE2020-CS-50 | Operating Systems | Process Scheduling | Silly calculation mistake | Exam panic. Messed up the calculation and got 10.5 somehow. Second-guessed my idea of "turnaround time" which led to this mistake. | |||||||||||||||||||||

26 | https://gateoverflow.in/333198/GATE2020-CS-33 | Compiler Design | Syntax directed Translation | Forgot concept | Concept was an easy one here but I forgot it. Should not have selected an option. | |||||||||||||||||||||

27 | https://gateoverflow.in/333179/GATE2020-CS-52 | Graph Theory | Edge colouring | Did not know concept | Did not know the concept at all. Knew vertex colouring. Also forgot what K(3,4) is supposed to represent. | |||||||||||||||||||||

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