Control Structures (If-Else and Loops) Quiz - CBSE Class 9 Computer Science

Free practice quiz: Control Structures (If-Else and Loops) (CBSE Class 9 Computer Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is the default else block in an if-else structure executed?

   1. When the if condition is true
   2. When the if condition is false
   3. Always
   4. Never
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   Answer: B. When the if condition is false

   The else block is executed only when the if condition evaluates to false.

2. What is the output when 'x = 5; if x == 5: print('Yes') else: print('No')' is executed?

   1. Yes
   2. No
   3. 5
   4. Error
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   Answer: A. Yes

   Since x equals 5, the if condition is true and 'Yes' is printed.

3. In an 'if' statement block in Python, what indicates that a block of code belongs to that statement?

   1. Curly braces {}
   2. Indentation
   3. Parentheses ()
   4. Square brackets []
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   Answer: B. Indentation

   Python uses indentation to define blocks of code, particularly for control structures like if statements.

4. What is the output of: 'for i in range(5, 1, -1): print(i)'?

   1. 5 4 3 2
   2. 5 4 3 2 1
   3. 4 3 2 1
   4. Error
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   Answer: A. 5 4 3 2

   The 'range(5, 1, -1)' generates numbers from 5 to 2 (step -1), printing 5, 4, 3, 2 on new lines.

5. In Python, what will happen if the indentation is incorrect in a loop?

   1. Nothing, Python ignores indentation
   2. Syntax error
   3. Logical error
   4. Performance delay
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   Answer: B. Syntax error

   Indentation is crucial in Python since it defines the level of code hierarchy. Incorrect indentation will lead to a SyntaxError.

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