Arrays: A Comprehensive Guide for Programming Principles Students

Question 1

Which of the following is the correct syntax to declare an array of integers called 'numbers' with a size of 10?

Accepted Answer

int[] numbers = new int[10];

Answer

int[10] numbers;

Answer

int numbers = [10];

Answer

int numbers[10] = new int[10];

Question 2

What is the value stored at index '2' of the following array: int[] arr = { 5, 10, 15, 20 };?

Accepted Answer

15

Answer

5

Answer

10

Answer

20

Question 3

Which of the following is a valid way to initialize an array with specific values at declaration?

Accepted Answer

int[] numbers = { 1, 2, 3 };

Answer

int[] numbers = new int[] { 1, 2, 3 };

Answer

int numbers[3] = { 1, 2, 3 };

Answer

int numbers[] = { 1, 2, 3 };

Question 4

What is the size of the following array: String[] names = { "John", "Mary", "Bob" };

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 5

Which loop construct is most appropriate for iterating through each element of an array?

Accepted Answer

foreach loop

Answer

while loop

Answer

for loop

Answer

do-while loop

Question 6

What is the primary reason for using a multidimensional array?

Accepted Answer

To store data in a hierarchical structure

Answer

To store data of different types

Answer

To increase the size of an array beyond its initial declaration

Answer

To improve the efficiency of array operations

Question 7

What is the fundamental difference between a one-dimensional and a two-dimensional array?

Accepted Answer

One-dimensional arrays store data linearly while two-dimensional arrays store data in a tabular format.

Answer

One-dimensional arrays can only store primitive data types while two-dimensional arrays can store objects.

Answer

One-dimensional arrays have a fixed size while two-dimensional arrays can have a dynamic size.

Answer

Two-dimensional arrays are more efficient for storing large amounts of data.

Question 8

Which of the following operations is NOT supported for arrays in Java?

Accepted Answer

Addition

Answer

Sorting

Answer

Searching

Answer

Reversing

Question 9

What is the time complexity of accessing an element in an array?

Accepted Answer

O(1)

Answer

O(log n)

Answer

O(n)

Answer

O(n^2)

Question 10

What is the primary purpose of an array in a programming language?

Accepted Answer

To store a collection of similar data elements.

Answer

To perform mathematical calculations.

Answer

To create a user interface.

Answer

To connect to a database.

Question 11

Provide the correct syntax for declaring an array named 'numbers' with a size of 10 in C#.

Accepted Answer

int[] numbers = new int[10];

Answer

numbers[10] = new int;

Answer

int[10] numbers;

Answer

new int[10] { numbers };

Question 12

In Java, which method can be used to obtain the length of an array?

Accepted Answer

length()

Answer

getSize()

Answer

getCount()

Answer

getDimensions()

Question 13

Which of the following statements correctly initializes an array with default values?

Accepted Answer

int[] array = new int[5];

Answer

int[] array = { 0, 0, 0, 0, 0 };

Answer

int[] array;

Answer

int[] array = null;

Question 14

What is a potential limitation associated with using arrays in programming?

Accepted Answer

They can be inflexible and difficult to resize.

Answer

They can lead to memory leaks.

Answer

They can be inefficient for storing large amounts of data.

Answer

They are not supported in all programming languages.

Question 15

Given the array 'numbers = {10, 20, 30, 40, 50}', what is the value stored in 'numbers[3]'?

Accepted Answer

40

Answer

10

Answer

20

Answer

30

Question 16

What will be the output of the following code snippet?
int[] numbers = {1, 2, 3, 4, 5};
for (int i = 0; i < numbers.length; i++)
   System.out.print(numbers[i]);

Accepted Answer

1 2 3 4 5

Answer

12345

Answer

01234

Answer

1 3 5

Question 17

In the multidimensional array 'numbers = {{1, 2}, {3, 4}, {5, 6}}', what is the value of 'numbers[1][1]'?

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 18

Which of the following is the correct syntax to declare a one-dimensional array of integers in Java?

Accepted Answer

int[] arr;

Answer

arr int;

Answer

int[arr];

Answer

int = arr;

Question 19

Consider the following Java code:

```
int[] numbers = {1, 2, 3, 4, 5};
int index = 2;
```
What is the value of numbers[index]?

Accepted Answer

3

Answer

Index out of bounds

Answer

4

Answer

2

Question 20

Which of the following is true about accessing elements in a two-dimensional array in Java?

Accepted Answer

The first index represents the row, and the second index represents the column

Answer

The first index represents the column, and the second index represents the row

Answer

Both indices represent the rows

Answer

Both indices represent the columns

Question 21

What is the purpose of using a 'for-each' loop to iterate through arrays in Java?

Accepted Answer

To simplify iterating over elements without managing indices

Answer

To initialize all elements to a specific value

Answer

To sort the elements of the array in ascending order

Answer

To search for a specific element in the array

Question 22

What is a common use case for arrays in Java programming?

Accepted Answer

Storing a collection of related data of the same type

Answer

Performing complex mathematical calculations

Answer

Representing a queue or stack data structure

Answer

Generating pseudorandom numbers

Question 23

How do one-dimensional and two-dimensional arrays differ in Java?

Accepted Answer

One-dimensional arrays store elements in a single row, while two-dimensional arrays store elements in a grid with rows and columns

Answer

One-dimensional arrays can only store primitive data types

Answer

Two-dimensional arrays are always larger than one-dimensional arrays

Answer

One-dimensional arrays use square brackets, while two-dimensional arrays use braces

Question 24

Which method is used to find the index of a specific element in an array in Java?

Accepted Answer

indexOf()

Answer

search()

Answer

findElement()

Answer

locate()

Question 25

What is the result of cloning an array in Java?

Accepted Answer

A new array with the same elements and length as the original, but separate in memory

Answer

A new array with twice the length of the original

Answer

Two arrays that reference the same memory location

Answer

An empty array

Question 26

What is a potential drawback of using arrays in programming?

Accepted Answer

Fixed size, which limits dynamic addition and removal of elements

Answer

Difficulty in sorting and searching elements efficiently

Answer

Slow access times compared to other data structures

Answer

High memory consumption, especially for large arrays

Question 27

What is the key difference between an array and an ArrayList in Java?

Accepted Answer

Arrays have a fixed size and store primitive data types, while ArrayLists are dynamic in size and store objects

Answer

ArrayLists are faster than arrays for most operations

Answer

Arrays can only be used to store a single type of element, while ArrayLists can store different types