4.2.1.2 Single- and multi-dimensional arrays Quiz: AQA Computer Science, Unit 2

The 20 questions

1. Which mathematical concept is best represented using a one-dimensional array?

   • Graph
   • Tuple
   • Matrix
   • Vector

2. A one-dimensional array is a useful way to represent which mathematical object?

   • A graph
   • A binary tree
   • A vector
   • A hash function

3. A two-dimensional array is a useful way to represent which mathematical object?

   • A queue
   • A dictionary
   • A stack
   • A matrix

4. An array is declared with indexes 0 to 9. How many elements does it hold?

   • 10
   • 9
   • 0
   • 11

5. A 3 by 4 array has 3 rows and 4 columns. How many elements does it hold?

   • 12
   • 3
   • 7
   • 34

6. What does an n-dimensional array require to access a specific element?

   • Tuple of n integers
   • Single integer pointer
   • Single floating-point value
   • List of strings

7. An array scores holds the values 4, 7, 2 and 9 at indexes 0 to 3. What is scores[2]?

   • 9
   • 4
   • 7
   • 2

8. A 2D array grid has rows 0 to 2 and columns 0 to 3. What is the value of grid[1][2] if row 1 is 5, 6, 7, 8?

   • 6
   • 5
   • 7
   • 8

9. A loop sums all 10 elements of a one-dimensional array. How many additions does it perform?

   • 1
   • 9
   • 10
   • 11

10. An array holds the values 3, 8 and 5 at indexes 0 to 2. What is the largest value in the array?

    • 5
    • 3
    • 8
    • 16

11. Why must all elements in a standard static array share the same data type?

    • Fixed element size
    • Dynamic memory allocation
    • Variable address offsets
    • Faster file saving

12. A program uses a one-dimensional array to store the 12 months' sales figures. Which index is used for January if indexing starts at 0?

    • 11
    • 0
    • 1
    • 12

13. A 2D array representing a 5 by 5 board needs what index to reach the centre cell if indexing starts at 0?

    • [1][1]
    • [4][4]
    • [5][5]
    • [2][2]

14. Which mathematical structure is best represented by a two-dimensional array?

    • Tree
    • Queue
    • Vector
    • Matrix

15. In a 5 by 6 timetable array of days and periods, what does one element represent?

    • An entire period
    • One lesson slot
    • One full day
    • A whole week

16. A one-dimensional array of 100 elements is used where indexes run 0 to 99. What is the index of the last element?

    • 99
    • 100
    • 1
    • 98

17. What main advantage does direct index access provide for array elements?

    • Automatic data sorting
    • Unlimited memory capacity
    • Constant time access
    • Dynamic auto-resizing

18. Which built-in structure in many high-level programming languages acts as an array equivalent?

    • Dictionary
    • Record
    • List
    • File

19. What happens if an array index is outside its defined bounds?

    • Run-time error
    • Logical reset
    • Automatic resize
    • Syntax error

20. A program stores a 3 by 3 grid in a two-dimensional array indexed from 0. Which index pair locates the middle value?

    • [1][1]
    • [0][1]
    • [2][2]
    • [3][3]

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