Code Optimization MCQs December 19, 2025December 14, 2024 by u930973931_answers 20 min Score: 0 Attempted: 0/20 Subscribe 1. What is the main goal of code optimization? (A) To make the code more readable (B) To reduce the size of the source code (C) To improve the performance of the code (D) To make the code easier to debug 2. Which of the following is a common technique used in code optimization? (A) Removing comments from the code (B) Removing redundant instructions (C) Increasing the number of variables (D) Increasing the complexity of the code 3. Which type of optimization focuses on reducing the number of instructions executed by the program? (A) Time optimization (B) Space optimization (C) Loop optimization (D) Code reorganization 4. What is loop unrolling? (A) Increasing the number of loops in the code (B) Rewriting loops in an unordered sequence (C) Breaking a loop into multiple smaller loops to improve efficiency (D) Removing loops from the code entirely 5. Which of the following can result in improved performance by reducing the number of conditional branches in a program? (A) Loop invariant code motion (B) Branch prediction (C) Register allocation (D) Function inlining 6. What is dead code elimination? (A) Simplifying loops (B) Deleting unused variables (C) Reducing the programâs execution time (D) Removing code that has no effect on the programâs output 7. What is constant folding in code optimization? (A) Replacing variables with constant values (B) Using loops to evaluate constants (C) Rewriting expressions with constant values to their evaluated result (D) Removing all constants from the code 8. Which of the following is an example of space optimization? (A) Using fewer registers in the program (B) Rewriting functions for better readability (C) Merging functions to reduce code size (D) Removing unused variables from the code 9. In code optimization, what does function inlining do? (A) It increases the number of function calls in the program (B) It removes function definitions to make the code shorter (C) It replaces a function call with the functionâs actual code to save time (D) It replaces all loops with function calls 10. What is the impact of instruction scheduling in code optimization? (A) It reduces the number of instructions in the program (B) It increases the programâs space requirements (C) It changes the order of instructions to minimize delays due to hazards (D) It automatically parallelizes the code 11. What is the purpose of register allocation in code optimization? (A) To minimize the number of registers used (B) To store variables in memory instead of registers (C) To increase the number of available registers (D) To improve the speed of memory access 12. Which of the following optimization techniques is focused on reducing the memory usage of the program? (A) Loop unrolling (B) Space optimization (C) Instruction selection (D) Constant propagation 13. Which technique eliminates unnecessary loads and stores in a program during optimization? (A) Dead code elimination (B) Instruction scheduling (C) Copy propagation (D) Constant folding 14. What is the role of alias analysis in code optimization? (A) To reorder instructions (B) To detect redundant function calls (C) To remove dead variables (D) To predict memory addresses and optimize pointer usage 15. What is peephole optimization? (A) A technique that optimizes entire loops (B) A low-level optimization technique that improves efficiency by examining a small window of code at a time (C) A method to rewrite functions for better performance (D) A technique that rewrites high-level code into machine-level code 16. What is a primary disadvantage of aggressive optimization? (A) It leads to increased code size (B) It can make the code harder to debug and maintain (C) It guarantees faster execution (D) It improves readability 17. Which of the following statements is true regarding the tradeoff in code optimization? (A) Optimizing for time always results in better space performance (B) Optimization always improves code readability (C) Code optimization guarantees reduced program size and improved execution time (D) Optimization for space may increase execution time 18. Which optimization technique is primarily used to eliminate redundant calculations in loops? (A) Loop fusion (B) Loop invariant code motion (C) Loop unrolling (D) Instruction scheduling 19. What is loop fusion? (A) Combining multiple loops into a single loop for better performance (B) Unrolling loops to improve execution time (C) Removing loops to decrease program size (D) Reversing loops for better memory access 20. Which of the following is an example of compiler optimization? (A) Optimizing the generated machine code for faster execution (B) Generating intermediate code (C) Syntax checking (D) Checking for logical errors in the code