Take this Exam: GCSE Computer Science: Algorithms and Programming | Zestly

Question 1

A program uses INPUT to read a number typed by the user and stores it in a variable called reply. The next line calculates total = reply * 2, and the program stops with an error. What is the most likely cause?

Accepted Answer

The value in reply is held as a string, and must be cast to an integer before it can be multiplied

Answer

A variable cannot be multiplied by a whole number, only by another variable

Answer

The variable total was not declared as a constant before it was used

Answer

The multiplication operator cannot appear on the same line as an assignment

Question 2

A two-dimensional array named 'grid' is defined with 3 rows and 3 columns. If the array is indexed starting at 0, which coordinate refers to the element in the second row and third column?

Accepted Answer

grid[1][2]

Answer

grid[2][1]

Answer

grid[2][3]

Answer

grid[3][2]

Question 3

A program accepts a whole-number age and treats any value from 18 to 65 inclusive as valid. Which set is the best choice of boundary test data?

Accepted Answer

17, 18, 65, 66

Answer

1, 18, 65, 100

Answer

18, 30, 50, 65

Answer

16, 17, 66, 67

Question 4

When designing a computer model of a traffic system, why is 'abstraction' used to remove details such as the colour of the cars or the weather conditions?

Answer

To make the program run faster on older hardware.

Answer

To reduce complexity and focus on the relevant factors.

Answer

To ensure the program can be written in any language.

Answer

To prevent users from modifying the underlying data.

Question 5

A bubble sort works through a list from left to right, comparing each adjacent pair and swapping them when the left value is the larger. Starting from the list 5, 3, 8, 1, 9, what is the list after ONE complete pass?

Answer

3, 5, 8, 1, 9

Answer

1, 3, 5, 8, 9

Answer

3, 5, 1, 9, 8

Answer

3, 5, 1, 8, 9