B CompE Bachelor of Computer Engineering Cheat Sheet 2026

The 30 highest-yield B CompE Bachelor of Computer Engineering facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What is the output of calling a virtual method through a base class pointer pointing to a derived object in C++? → Derived class version is called
2. Which layer of the OSI model is responsible for end-to-end communication and error recovery? → Transport Layer
3. Which RAID level mirrors data across two disks, providing fault tolerance but halving usable capacity? → RAID 1
4. In a full adder, how many inputs does it have? → 3
5. What is the IPv6 equivalent of an IPv4 broadcast address? → IPv6 does not support broadcast
6. Which data structure allows efficient insertion and deletion at both ends in O(1) time? → Deque (double-ended queue)
7. According to the Nyquist sampling theorem, a band-limited signal with maximum frequency f_max must be sampled at a minimum rate of: → 2 × f_max
8. When a parent process terminates, all child processes also end, which is known as cascading termination. → Normally or abnormally
9. In Java, what happens if a subclass does not override an abstract method from its abstract parent? → The subclass must also be declared abstract
10. Which cache write policy writes data to both the cache and main memory simultaneously on every write hit? → Write-through
11. In virtual memory systems, what structure maps virtual page numbers to physical frame numbers? → Page table
12. How long does it take to insert at the end of a dynamic array? → Either O(1) or O(n)
13. How many words can an 8-bit CPU process? → 8-bits – 64 bits
14. Speculative execution combined with a mispredicted branch requires the processor to: → Flush the pipeline and restart from the correct path
15. Which type of network topology connects every node directly to every other node? → Mesh
16. Regarding polymorphism, which of the following is false? → Increases overhead of function definition always
17. What is 'thrashing' in virtual memory management? → High CPU utilization with no useful work due to constant page faults
18. What is the output of: `int x = 10; printf("%d", x++);`? → 10
19. What kind of computer architecture is the following? → All of the above
20. Which Boolean expression represents De Morgan's first theorem? → (A·B)' = A'+B'
21. Which function is used to release memory allocated by `malloc`? → free
22. In C, what is undefined behavior? → Code whose behavior is not specified by the C standard and may produce any result
23. What is the purpose of a database view? → Provide a virtual table based on the result of a stored query
24. What exactly is an operating system? → All of the above
25. In the Banker's Algorithm for deadlock avoidance, what does the 'safe state' guarantee? → There exists a sequence in which every process can obtain its maximum resources and finish
26. The processor is considered to have _____ if an exception is thrown and the subsequent instructions are fully executed. → Imprecise exceptions
27. Which of the following is not an operating system that runs in real time? → Palm OS
28. Register renaming in out-of-order processors primarily eliminates which type of hazard? → WAR and WAW (false) hazards
29. What is the primary benefit of using interfaces to program against rather than concrete classes? → It enables coding to a contract, reducing coupling to specific implementations
30. Which programming language was the first to focus solely on objects? → SmallTalk