Control Structures Quiz - CBSE Class 11 ICT

Free practice quiz: Control Structures (CBSE Class 11 ICT). 14 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which control structure is used to repeatedly execute a block of code?

   1. if-else
   2. switch
   3. loop
   4. function
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   Answer: C. loop

   Loops (like 'for' and 'while') are designed for repetitive execution of code blocks.

2. What is the difference between 'while' and 'do-while' loops?

   1. There is no difference
   2. 'while' checks the condition before each iteration, 'do-while' checks after
   3. 'do-while' checks the condition before each iteration, 'while' checks after
   4. They are used in different programming languages
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   Answer: B. 'while' checks the condition before each iteration, 'do-while' checks after

   'while' loop checks the condition first, 'do-while' executes the loop body at least once.

3. What is nested loop?

   1. A loop inside another loop
   2. A loop that never ends
   3. A loop with multiple conditions
   4. A loop that executes only once
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   Answer: A. A loop inside another loop

   A nested loop is a loop placed inside another loop.

4. What is an infinite loop and how can you prevent it?

   1. A loop with a condition that always evaluates to false
   2. A loop with a condition that always evaluates to true
   3. A loop that executes only once
   4. A loop with multiple conditions
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   Answer: B. A loop with a condition that always evaluates to true

   An infinite loop occurs when the loop condition never becomes false; proper loop termination conditions are essential to prevent it.

5. How can you improve the efficiency of a recursive function?

   1. Avoid using recursion altogether
   2. Use memoization to store previously calculated results
   3. Increase the recursion depth
   4. Ignore optimization techniques
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   Answer: B. Use memoization to store previously calculated results

   Memoization improves efficiency by storing and reusing previously computed results, thus avoiding redundant calculations.

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