Arrays and Lists: A Comprehensive Guide for Year 7 Computing Students

Question 1

What is the starting index of an array?

Accepted Answer

0

Answer

1

Answer

n-1

Answer

n

Question 2

What's the main difference between arrays and lists in Java?

Accepted Answer

Arrays have a fixed size, while lists can change size.

Answer

Arrays can hold different types of data, but lists can only hold one type.

Answer

Arrays can't be changed, but lists can be changed.

Question 3

Which of the following is NOT a characteristic of arrays?

Accepted Answer

Elements can be added and removed dynamically

Answer

Elements have fixed positions

Answer

Elements are accessed using an index

Answer

Elements are stored in consecutive memory locations

Question 4

What is the purpose of the following code: `int[] numbers = new int[5];`?

Accepted Answer

Creates an array of integers with space for 5 elements

Answer

Initializes an array of integers with 5 elements

Answer

Assigns 5 elements to an existing array

Answer

Stores the value 5 in an array

Question 5

Which of the following methods is used to access the element at index 2 in an array called `numbers`?

Accepted Answer

numbers[2]

Answer

numbers.get(2)

Answer

numbers(2)

Answer

myIndex[2]

Question 6

What is the output of the following code: `System.out.println(numbers.length);`?

Accepted Answer

The number of elements in the array

Answer

The index of the last element in the array

Answer

The value of the first element in the array

Answer

An error message

Question 7

What is the purpose of the `ArrayList` class in Java?

Accepted Answer

To represent a resizable array of objects

Answer

To store primitive data types

Answer

To perform sorting and searching operations

Answer

To create linked lists

Question 8

What is the purpose of the 'length' property in an array?

Accepted Answer

To store the number of elements in the array

Answer

To store the size of individual elements in the array

Answer

To access the last element in the array

Answer

To modify the values of elements in the array

Question 9

What is the use of a 'for' loop when working with arrays?

Accepted Answer

To iterate through each element in the array

Answer

To add new elements to the array

Answer

To remove elements from the array

Answer

To access specific elements in the array

Question 10

Which of the following is an example of a 2D array?

Accepted Answer

array = [[1, 2, 3], [4, 5, 6]]

Answer

array = [1, 2, 3]

Answer

array = {1, 2, 3}

Answer

list = [1, 2, [3, 4]]

Question 11

What is the purpose of the 'append()' method in Python?

Accepted Answer

To add a new element to the end of a list

Answer

To remove an element from a list

Answer

To access the last element in a list

Answer

To modify the value of an element in a list

Question 12

What is the main distinction between a tuple and a list in Python?

Accepted Answer

Tuples are immutable, while lists are mutable

Answer

Lists can store elements of any data type, while tuples can only store elements of the same data type

Answer

Tuples are faster than lists

Answer

There is no difference between tuples and lists

Question 13

Which of the following is the correct syntax to declare an array in Python?

Accepted Answer

arrayName = [element1, element2...]

Answer

arrayName = array(element1, element2...)

Answer

arrayName = new array(element1, element2...)

Answer

arrayName = list(element1, element2...)

Question 14

What is the index of the first element in an array?

Accepted Answer

0

Answer

1

Answer

The last index of the array

Answer

Array indices start from a random number

Question 15

What is the purpose of using a loop when working with arrays?

Accepted Answer

To iterate over each element of the array

Answer

To check if the array is empty

Answer

To find the maximum value in the array

Answer

To sort the array in ascending order

Question 16

What is the key difference between an array and a linked list?

Accepted Answer

Arrays use contiguous memory, while linked lists do not

Answer

Arrays can only store primitive data types, while linked lists can store objects

Answer

Linked lists are faster than arrays

Answer

Arrays are easier to implement than linked lists

Question 17

To access the second element of a list named 'my_list', what is the correct syntax?

Accepted Answer

my_list[1]

Answer

my_list(1)

Answer

my_list.get(1)

Answer

my_list[2]

Question 18

What is the key difference between a list and a tuple in Python?

Accepted Answer

Lists are mutable, while tuples are immutable.

Answer

Tuples are mutable, while lists are immutable.

Answer

Lists can contain any data type, while tuples can only contain numbers.

Answer

Tuples can contain any data type, while lists can only contain strings.

Question 19

Which of the following is NOT an application of lists in programming?

Accepted Answer

Calculating the average of a dataset

Answer

Storing student records

Answer

Storing a deck of cards

Answer

Creating a shopping list

Question 20

Which syntax is correct for iterating through a list?

Accepted Answer

for element in list:

Answer

while element in list:

Answer

for element of list:

Answer

foreach element in list:

Question 21

In which situations might a linked list be a better choice than an array?

Accepted Answer

When data is frequently added or removed

Accepted Answer

When accessing data in the middle of the list is necessary

Accepted Answer

When the data size is not fixed

Answer

When storing large amounts of data

Question 22

What is the main difference between an array and a list?

Accepted Answer

Arrays have a fixed size, while lists can change in size.

Answer

Lists are more efficient for storing large amounts of data.

Answer

Arrays can only store simple data types, while lists can store complex data types.

Answer

There is no difference between arrays and lists.

Question 23

Which of the following is the correct syntax for creating an array in Python?

Accepted Answer

my_array = [1, 2, 3]

Answer

my_array = (1, 2, 3)

Answer

my_array = {1, 2, 3}

Answer

my_array.append(1, 2, 3)

Question 24

What does the 'length' attribute of an array store?

Accepted Answer

The number of elements in the array

Answer

The maximum size of the array

Answer

The data type of the array

Answer

The elements of the array

Question 25

What is the difference between the 'append()' and 'insert()' methods for lists in Python?

Accepted Answer

'append()' adds an element to the end of the list, while 'insert()' inserts an element at a specific position.

Answer

'insert()' adds an element to the end of the list, while 'append()' inserts an element at a specific position.

Answer

Both methods do the same thing.

Answer

There is no 'insert()' method for lists in Python.

Question 26

In arrays, how do we access elements using sequential access?

Accepted Answer

Directly accessing the element using its index number

Answer

Searching the entire array for the desired element

Answer

Using a special command to locate the element

Answer

Accessing elements in reverse order

Question 27

In an unsorted array, how long does it usually take to find a specific element?

Accepted Answer

Linear time (time increases as the array gets larger)

Answer

Constant time (same amount of time regardless of the array size)

Answer

Logarithmic time (time increases gradually as the array gets larger)

Question 28

Which of the following statements about arrays is correct?

Accepted Answer

Arrays have a fixed size.

Accepted Answer

Arrays can be accessed randomly using an index.

Answer

Arrays can store elements of different data types.

Answer

Arrays can be resized dynamically.

Question 29

How can we use a multidimensional array to represent a multiplication table?

Accepted Answer

Each element in the array stores the product of the row and column numbers.

Answer

The array has one row and multiple columns, with each column representing a multiplication fact.

Answer

The array has multiple rows and one column, with each row representing a multiplication fact.

Answer

Multidimensional arrays are not suitable for storing multiplication tables because they are inefficient.

Question 30

What is the main reason we use arrays and lists in programming?

Accepted Answer

To organize and store groups of information.

Answer

To tell the program what steps to take.

Answer

To show words on the computer screen.

Answer

To do math problems.

Question 31

Which of these is NOT true about arrays?

Accepted Answer

They can hold different kinds of data in the same array.

Answer

You can find an item in an array using its number (index).

Answer

An array has a fixed size once it's created.

Answer

Items in an array are stored next to each other in the computer's memory.

Question 32

We have a list called 'fruits' with these items: ['apple', 'banana', 'orange']. How do we get the word 'banana' from the list?

Accepted Answer

fruits[1]

Answer

fruits['banana']

Answer

fruits[2]

Answer

fruits[0]

Question 33

What happens when we write this code:  `numbers[2] = 10` ?

Accepted Answer

It changes the third item in the 'numbers' list to the value 10.

Answer

It makes a new list called 'numbers' with only the value 10.

Answer

It adds the value 10 to the second item in the 'numbers' list.

Question 34

If we make a list like this: `colors = ['red', 'green', 'blue']`, how many items are in the list?

Accepted Answer

3

Answer

It depends on how much space the computer has.

Answer

4

Answer

2

Question 35

What does it mean for a list to be 'mutable'?

Accepted Answer

You can change the items in the list after it's been made.

Answer

It can only hold a certain number of items.

Answer

It can only hold things that are all the same type (like numbers only).

Question 36

Why is it important to know the index of an item in an array?

Accepted Answer

So we can find and change that specific item in the array.

Answer

To change what type of data the item is.

Answer

To count how many items are in the array.

Question 37

When would we use a list instead of an array?

Accepted Answer

When we need to store a group of student names, but the number of students might change.

Answer

When we want to represent the colors of the rainbow, because there are always seven colors.

Answer

When we want to store the scores from a game where the number of players is already set.

Question 38

What is the correct way to access the third element in an array named 'numbers'?

Accepted Answer

numbers[2]

Answer

numbers[3]

Answer

numbers(2)

Answer

numbers.get(2)

Question 39

You have an array named 'colors' with the values ['red', 'green', 'blue']. How would you add the color 'yellow' to the end of the array?

Accepted Answer

colors.append('yellow')

Answer

colors.insert(0, 'yellow')

Answer

colors.add('yellow')

Answer

colors[3] = 'yellow'

Question 40

Which data structure allows you to store a collection of items in a specific order?

Accepted Answer

List

Answer

Dictionary

Answer

Tuple

Answer

Set

Question 41

You have a list called 'fruits' containing ['apple', 'banana', 'orange']. What is the output of the following code: `print(fruits[1])`?

Accepted Answer

banana

Answer

orange

Answer

Error

Answer

apple

Question 42

What is the purpose of using arrays and lists in programming?

Accepted Answer

To store and organize collections of data.

Answer

To create user interfaces.

Answer

To perform mathematical calculations.

Question 43

Which of the following is NOT a valid way to create an array in Python?

Accepted Answer

array = [1, 2, 3] * 2

Answer

array = list((1, 2, 3))

Answer

array = list(range(1, 4))

Answer

array = [1, 2, 3]

Question 44

You have a list called 'numbers' with the values [1, 5, 2, 8]. How would you remove the element '5' from the list?

Accepted Answer

numbers.remove(5)

Answer

numbers.delete(5)

Answer

numbers[1] = None

Answer

numbers.pop(5)

Question 45

What is the difference between an array and a list?

Accepted Answer

Arrays are generally fixed in size, while lists can be dynamically resized.

Answer

Arrays are used in Python, while lists are used in other programming languages.

Answer

Arrays store only numbers, while lists can store any type of data.

Question 46

You have a list named 'animals' with the values ['dog', 'cat', 'bird']. How would you sort the list alphabetically?

Accepted Answer

animals.sort()

Answer

animals.arrange()

Answer

animals.order()

Answer

animals.sort(reverse=True)

Question 47

What is the purpose of the 'len()' function when used with an array or list?

Accepted Answer

To determine the number of elements in the array or list.

Answer

To find the largest element in the array or list.

Answer

To reverse the order of elements in the array or list.