File I/O in Python
15 questions · 12 min · Medium
Python Control Statements Quiz – 20 Questions with Answers
Test your knowledge of control statements in Python with 20 questions covering if, elif, else, nested conditions, for loops, while loops, break, continue, pass, and loop control.
- 20
- Questions
- 15 min
- Time limit
- Medium
- Difficulty
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All 15 questions and answers Spoilers: this shows the questions and answers. Try the quiz first! Open
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1. Which keyword is used to execute a block of code when a condition is true in Python?
- A. if
- B. when
- C. check
- D. condition
Show answer
A. if
The if statement executes its indented block when its condition evaluates to True.
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2. Which keyword is used to test another condition when the preceding if or elif condition is false?
- A. else if
- B. elif
- C. elseif
- D. otherwise
Show answer
B. elif
The elif keyword allows Python to test another condition after a preceding if or elif condition is false.
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3. Which keyword executes a block when all preceding if and elif conditions are false?
- A. otherwise
- B. default
- C. else
- D. fallback
Show answer
C. else
The else block executes when none of the preceding if or elif conditions evaluates to True.
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4. What is the output of the following code? x = 10; if x > 5: print("Yes")
- A. Yes
- B. No
- C. 10
- D. Error
Show answer
A. Yes
The condition x > 5 is true because 10 is greater than 5, so the print statement executes.
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5. Which Python loop is commonly used to iterate over the elements of a sequence?
- A. for
- B. repeat
- C. loop
- D. iterate
Show answer
A. for
The for loop iterates over items in an iterable such as a list, tuple, string, or range.
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6. Which loop continues executing as long as its condition remains true?
- A. for
- B. while
- C. repeat
- D. until
Show answer
B. while
A while loop repeatedly executes its body while its condition evaluates to True.
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7. What is the output of this code? for i in range(3): print(i)
- A. 1 2 3
- B. 0 1 2
- C. 0 1 2 3
- D. 3 2 1
Show answer
B. 0 1 2
range(3) produces the values 0, 1, and 2, so those values are printed.
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8. Which statement immediately terminates the nearest enclosing loop?
- A. stop
- B. exit
- C. break
- D. terminate
Show answer
C. break
The break statement immediately exits the nearest enclosing for or while loop.
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9. Which statement skips the rest of the current loop iteration and continues with the next iteration?
- A. skip
- B. continue
- C. next
- D. pass
Show answer
B. continue
The continue statement skips the remaining statements in the current iteration and proceeds to the next iteration.
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10. What does the pass statement do in Python?
- A. Terminates the program
- B. Skips the entire loop
- C. Acts as a placeholder and performs no operation
- D. Repeats the current iteration
Show answer
C. Acts as a placeholder and performs no operation
The pass statement does nothing when executed and is commonly used where Python syntax requires a statement.
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11. What is the output of this code? x = 15; if x > 20: print("A"); else: print("B")
- A. A
- B. B
- C. 15
- D. Nothing
Show answer
B. B
The condition x > 20 is false because x is 15, so the else block executes.
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12. Which statement correctly represents a nested conditional in Python?
- A. An if statement inside another if statement
- B. An if statement without a condition
- C. An else statement before an if statement
- D. Two unrelated loops
Show answer
A. An if statement inside another if statement
A nested conditional occurs when one conditional statement is placed inside the block of another conditional statement.
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13. What is the output of this code? for i in range(5): if i == 3: break; print(i)
- A. 0 1 2
- B. 0 1 2 3
- C. 1 2 3
- D. 0 1 2 3 4
Show answer
A. 0 1 2
The loop prints 0, 1, and 2. When i becomes 3, break terminates the loop before 3 is printed.
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14. What is the output of this code? for i in range(5): if i == 2: continue; print(i)
- A. 0 1 2 3 4
- B. 0 1 3 4
- C. 1 2 3 4
- D. 0 2 4
Show answer
B. 0 1 3 4
When i equals 2, continue skips the print statement for that iteration, while the other values are printed.
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15. Which function is commonly used with a for loop to generate a sequence of integers?
- A. range()
- B. sequence()
- C. numbers()
- D. iterate()
Show answer
A. range()
The range() function produces an iterable sequence of integers commonly used with for loops.
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16. What happens if the condition of a while loop is initially False?
- A. The loop body executes once
- B. The loop body does not execute
- C. The loop runs forever
- D. Python automatically changes the condition
Show answer
B. The loop body does not execute
A while loop checks its condition before each iteration, so a false initial condition means its body is skipped.
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17. What keyword can be used with a loop to execute a block when the loop completes normally without encountering break?
- A. finally
- B. else
- C. after
- D. complete
Show answer
B. else
Python loops can have an else clause that executes when the loop finishes normally rather than through a break statement.
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18. What is the output of this code? for i in range(3): print(i) else: print("Done")
- A. 0 1 2
- B. Done
- C. 0 1 2 Done
- D. 0 1 Done
Show answer
C. 0 1 2 Done
The loop prints 0, 1, and 2 and then completes normally, so its else block prints Done.
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19. Which operator is commonly used to combine multiple conditions so that all specified conditions must be true?
- A. or
- B. and
- C. not
- D. xor
Show answer
B. and
The and operator produces True when all of its operands are true.
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20. Which operator reverses a Boolean condition in Python?
- A. reverse
- B. invert
- C. not
- D. opposite
Show answer
C. not
The not operator reverses a Boolean value, turning True into False and False into True.