MCQs on Control Structures | Lua

1. if, else, and elseif

1. What does the if statement do in Lua?
   • a) Loops through a block of code
   • b) Executes a block if a condition is true
   • c) Stops program execution
   • d) Handles errors
2. Which keyword is used to provide an alternative path in an if block?
   • a) elseif
   • b) else
   • c) elseifelse
   • d) then
3. What must an if condition evaluate to in Lua?
   • a) Boolean (true or false)
   • b) Any number
   • c) Any string
   • d) A table
4. What happens if none of the conditions in an if–elseif block are true?
   • a) An error is thrown
   • b) The else block is executed
   • c) The if block is retried
   • d) The script terminates
5. What keyword must immediately follow the if condition?
   • a) then
   • b) do
   • c) end
   • d) elseif
6. Can elseif be used without an else block?
   • a) Yes
   • b) No
   • c) Only with a condition
   • d) It depends on Lua version
7. How are nested if statements structured in Lua?
   • a) Using brackets
   • b) Each if must have its own end
   • c) Nesting is not allowed
   • d) Using semicolons
8. What is the default value of a condition in Lua if omitted?
   • a) true
   • b) false
   • c) nil
   • d) Error

2. Loops: while, repeat...until, and for

9. What does a while loop do in Lua?
   • a) Executes until the condition becomes false
   • b) Executes once
   • c) Iterates through a list
   • d) Evaluates conditions after the block
10. Which loop evaluates its condition after executing its body?
    • a) while
    • b) for
    • c) repeat...until
    • d) if
11. How is the repeat...until loop terminated?
    • a) Using break
    • b) When the condition evaluates to true
    • c) When the condition evaluates to false
    • d) When a variable is updated
12. What keyword is used to iterate over a sequence of numbers in Lua?
    • a) for
    • b) while
    • c) do
    • d) in
13. What is the default step in a numeric for loop?
    • a) 1
    • b) 0
    • c) 2
    • d) Depends on the range
14. Which of the following is NOT true for a for loop?
    • a) It must have a start, stop, and step
    • b) It can decrement values
    • c) It executes at least once
    • d) It uses end to terminate
15. Can while loops be nested in Lua?
    • a) Yes, with do blocks
    • b) Yes, with separate conditions
    • c) No, nesting is not allowed
    • d) Only in certain versions
16. What will a repeat...until loop with a true condition do?
    • a) Execute once and exit
    • b) Cause an infinite loop
    • c) Skip execution
    • d) Throw an error
17. Which statement best describes the difference between while and repeat...until?
    • a) while executes at least once
    • b) repeat...until executes at least once
    • c) Both are identical
    • d) while doesn’t require conditions

3. Using break and return

18. What does the break statement do in Lua?
    • a) Exits a loop immediately
    • b) Exits the program
    • c) Pauses a loop temporarily
    • d) Returns a value
19. Can break be used outside of a loop in Lua?
    • a) Yes
    • b) No
    • c) Only in functions
    • d) Only in conditionals
20. What happens if break is executed in a while loop?
    • a) The loop terminates
    • b) The loop restarts
    • c) The loop condition is ignored
    • d) An error is thrown
21. Where can the return statement be used in Lua?
    • a) Only in loops
    • b) Only in functions
    • c) Anywhere
    • d) Only with if
22. What does return do in a function?
    • a) Ends the function execution and returns a value
    • b) Exits a loop
    • c) Starts a new iteration
    • d) Throws an error
23. How many values can a return statement provide?
    • a) Only one
    • b) Two
    • c) Unlimited
    • d) None
24. Can break and return be used together?
    • a) Yes, in any block
    • b) Yes, but only in loops
    • c) No, it causes a conflict
    • d) Only in functions
25. Which of these statements is valid for using break?
    • a) Inside repeat...until
    • b) Inside if
    • c) Outside any control structure
    • d) Inside a table
26. Does return terminate the function immediately?
    • a) Yes, always
    • b) No, it depends on the condition
    • c) Only if followed by end
    • d) Only if in a loop
27. What happens if return is used without a value?
    • a) Returns nil
    • b) Causes an error
    • c) Returns 0
    • d) Continues execution
28. Can break be used in nested loops?
    • a) Yes, but only exits the inner loop
    • b) No
    • c) Only if explicitly declared
    • d) Exits all loops
29. Which keyword immediately stops a Lua program?
    • a) break
    • b) return
    • c) os.exit()
    • d) stop
30. Can break and return have conditions in Lua?
    • a) Yes, with if statements
    • b) No
    • c) Only break can have conditions
    • d) Only return can have conditions

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