Computer Scince Quizz - March 2025

A traffic light simulator uses pseudocode to determine actions based on color input. The rules are:

"Red" → "Stop", "Yellow" → "Caution", "Green" → "Go".

The function trafficLight() mistakenly returns "Go" for "Yellow" due to incorrect condition ordering.

5. How should the conditions be ordered to fix this?
   

• Swap "Green" and "Red" checks

• Place "Yellow" first

• Replace ELSEIF with CASE

• No changes needed

Answer explanation

The current order checks "Green" before "Yellow," causing incorrect returns. Reordering ensures correct priority.

Therefore teh answer is "Place "Yellow" first"

A developer is writing a function to check whether a given string consists only of numeric digits.

What method should they use to verify each character is a number?

• Checking ASCII values

• Using regular expressions

• Checking character properties

• Using a loop to compare each character manually

Answer explanation

ASCII values for digits range from 48 ('0') to 57 ('9'). By iterating through each character and ensuring its ASCII value falls within this range, we can validate that the string contains only numeric digits.

A company is developing a program to process a list of customer orders. The program needs to iterate over each order and apply a discount if the order total exceeds a certain amount.

Which loop structure is most suitable?

• While loop

• Do-while loop

• For loop

• Recursive function

Answer explanation

A for loop is best suited when iterating through a known number of elements, such as a list of customer orders. It ensures that each order is processed sequentially without unnecessary checks.

A software engineer is developing a program that performs calculations on large datasets. Instead of rewriting the same logic multiple times, they decide to use functions.

What is the main benefit of using reusable functions?

• Reduced memory usage

• Increased performance

• Code maintainability and reusability

• Faster execution speed

Answer explanation

Functions allow code to be reused multiple times without duplication. This improves maintainability, as any changes to logic need to be updated in only one place.


Therefore the answer is :
Code maintainability and reusability

A weather application determines if it should send a rain alert based on the current precipitation percentage.

Which conditional statement should be used?

• If-else statement

• Switch-case statement

• For loop

• While loop

Answer explanation

An if-else statement is ideal for decision-making based on conditions. It allows checking if precipitation is above a certain threshold to trigger an alert.

Therefore teh answer is:
If-else statement

A software developer needs to sort a list of product prices in ascending order.
Which sorting algorithm is used?

• Quick Sort

• Merge Sort

• Bubble Sort

• Insertion Sort

Answer explanation

Bubble Sort repeatedly steps through the list, compares adjacent elements, and swaps them if they are in the wrong order. It is simple to implement but inefficient for large datasets.

A teacher wants to print every third number between 1 and 10. The pseudocode uses a FOR loop and MOD operation to identify these numbers.

Which numbers will be printed?

• 1, 2, 3

• 3, 6, 9

• 1, 4, 7

• 2, 4, 6

Answer explanation

The loop runs from 1 to 10. The MOD operation checks if each number divided by 3 leaves no remainder. Only numbers divisible by 3 (3, 6, 9) satisfy this condition. This demonstrates how MOD can select specific items in a sequence.

A program calculates the area of a rectangle but gives wrong results when negative values are input.
How can the function be improved?

• Add a check for negative values

• Change RETURN to PRINT

• Remove the parameters

• Use a loop instead

Answer explanation

The function should validate inputs to ensure they are positive, as area cannot be negative. Adding an IF statement to reject negative values or convert them to positives would improve robustness. This prevents mathematically invalid results and aligns with real-world constraints.


Therefore the answer is :
Add a check for negative values

A login system checks passwords but is case-sensitive, causing user frustration.
How can the function be modified to ignore case?

• Convert both strings to lowercase before comparing

• Use input != stored

• Remove the ELSE block

• Add a loop to check each character

Answer explanation

By converting both input and stored to the same case (e.g., lowercase), the comparison becomes case-insensitive. This improves user experience without compromising security. For example, "PassWord" and "password" would then match.

Therefore the answer is :
Convert both strings to lowercase before comparing

A function isEven() returns true for odd numbers due to a logical error.
How can the function be corrected?

• Change == 1 to == 0

• Swap true and false

• Replace % with /

• Remove the ELSE block

Answer explanation

The modulus operator % checks the remainder. For even numbers, num % 2 equals 0, not 1. The corrected condition ensures the function returns true only for even numbers, fixing the logical error.
Therefore the answer is:
Change == 1 to == 0