Common Optimization Techniques (e.g., Loop Optimization, Constant Folding, Dead Code Elimination) MCQs January 8, 2026December 14, 2024 by u930973931_answers 20 min Score: 0 Attempted: 0/20 Subscribe 1. Which of the following is the primary goal of loop optimization? (A) To remove unnecessary loops (B) To make the loop more readable (C) To reduce the number of instructions in the loop body (D) To increase the size of the loop 2. What does constant folding optimization do? (A) It evaluates constant expressions at compile time (B) It removes loops that do not execute (C) It eliminates dead code (D) It converts loops into functions 3. Dead code elimination removes code that: (A) Is part of the program’s functionality but has no effect (B) Will never be executed because it is unreachable (C) Is redundant in terms of calculations (D) Is unnecessary for memory management 4. Which of the following optimizations is aimed at reducing the number of loop iterations? (A) Strength reduction (B) Constant folding (C) Loop unrolling (D) Dead code elimination 5. Which optimization technique involves replacing a function call with the value of an expression when the expression is constant at compile time? (A) Dead code elimination (B) Constant folding (C) Constant propagation (D) Inline expansion 6. In dead code elimination, which of the following types of code would typically be removed? (A) Code that does not modify the program’s state (B) Code that is never reached during program execution (C) Code that is called but never executed (D) Code that causes an error 7. What is the effect of loop unrolling optimization? (A) It reduces the overhead of loop control by increasing the number of instructions inside the loop (B) It reduces the number of iterations in the loop (C) It makes the code more readable by breaking loops into smaller steps (D) It optimizes memory access patterns in the loop 8. Which of the following is an example of a common optimization technique that eliminates unnecessary calculations in loops? (A) Loop invariant code motion (B) Loop splitting (C) Loop fusion (D) Loop unrolling 9. Which optimization technique evaluates constant expressions during compile-time and replaces them with their values? (A) Loop optimization (B) Constant folding (C) Dead code elimination (D) Strength reduction 10. Which of the following techniques is used to replace expressions in loops with simpler ones by pre-computing constant expressions? (A) Constant propagation (B) Loop unrolling (C) Loop invariant code motion (D) Strength reduction 11. Which of the following is an example of a loop optimization technique? (A) Constant folding (B) Dead code elimination (C) Function inlining (D) Loop unrolling 12. What is the primary benefit of strength reduction in optimization? (A) It makes loops more efficient (B) It removes unnecessary code (C) It reduces the strength of operators to less costly ones (D) It simplifies expressions in the code 13. Which optimization technique is used to eliminate computations that do not contribute to the final result? (A) Loop unrolling (B) Constant folding (C) Constant propagation (D) Dead code elimination 14. Which of the following optimizations is most effective when dealing with repeated calculations in loops? (A) Constant folding (B) Loop invariant code motion (C) Strength reduction (D) Function inlining 15. In which scenario is constant propagation most effective? (A) When variables are frequently reassigned new values (B) When variables are assigned constant values across the program (C) When there are loops with complex conditions (D) When a program uses a lot of conditional branches 16. Which of the following optimizations is aimed at reducing the size of the code by eliminating unused or redundant code? (A) Dead code elimination (B) Constant folding (C) Strength reduction (D) Instruction scheduling 17. Which optimization technique can reduce the number of executed instructions by combining multiple instructions into a single instruction? (A) Peephole optimization (B) Constant folding (C) Dead code elimination (D) Strength reduction 18. Which of the following is an example of strength reduction optimization in a loop? (A) Removing dead branches in conditional statements (B) Removing loop control instructions (C) Replacing a multiplication by a constant with an addition (D) Replacing a division operation with a multiplication by the reciprocal 19. Which optimization technique is particularly useful for reducing memory access in loops? (A) Loop unrolling (B) Strength reduction (C) Register allocation (D) Dead code elimination 20. Which optimization technique aims to eliminate unreachable code or unused variables during program execution? (A) Loop unrolling (B) Constant propagation (C) Dead code elimination (D) Strength reduction