Arrays are fundamental data structures in computer science and programming, serving as ordered collections of elements of the same type stored in contiguous memory locations. They enable efficient storage and access of multiple values using a single variable, typically through indexing, where the first element is at index 0. For instance, an array might hold a list of numbers like [5, 10, 15, 20], allowing quick retrieval or modification of specific items. Arrays are versatile, used in sorting algorithms, data processing, and more, though they often have a fixed size, requiring careful planning to avoid overflow or underutilization. In languages like Java or Python, arrays (or lists in Python) simplify tasks such as iterating through data sets or performing operations on sequences.
Table of contents
- Part 1: Create an amazing arrays quiz using AI instantly in OnlineExamMaker
- Part 2: 20 arrays quiz questions & answers
- Part 3: Automatically generate quiz questions using AI Question Generator
Part 1: Create an amazing arrays quiz using AI instantly in OnlineExamMaker
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Part 2: 20 arrays quiz questions & answers
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1. What is an array in programming?
A. A variable that holds a single value
B. A collection of elements of the same type stored in contiguous memory locations
C. A function that performs calculations
D. A type of loop
Answer: B
Explanation: An array is a data structure that allows storing multiple elements of the same data type in contiguous memory, making it efficient for access and manipulation.
2. How do you declare an array in C++?
A. array myArray[5];
B. int myArray[5];
C. declare array myArray(5);
D. var myArray = new int[5];
Answer: B
Explanation: In C++, arrays are declared using the syntax type arrayName[arraySize], such as int myArray[5], which creates an array of 5 integers.
3. What is the index of the first element in an array?
A. 0
B. 1
C. It varies by language
D. -1
Answer: A
Explanation: In most programming languages, arrays are zero-indexed, meaning the first element is at index 0.
4. Which of the following is true about array size in C?
A. It can be changed after declaration
B. It must be a constant or known at compile time for static arrays
C. Arrays can only hold strings
D. Size is always dynamic
Answer: B
Explanation: In C, the size of a static array must be known at compile time and cannot be changed afterward without using dynamic memory allocation.
5. How do you access the third element in an array named nums with 5 elements?
A. nums[2]
B. nums[3]
C. nums[1]
D. nums[0]
Answer: B
Explanation: Arrays are zero-indexed, so the third element is at index 2 if counting starts from 0, but for the third position, it’s index 2 in zero-based indexing.
6. What happens if you access an array element outside its bounds?
A. The program runs normally
B. It may cause undefined behavior or errors
C. The element is automatically created
D. Nothing, as arrays expand dynamically
Answer: B
Explanation: Accessing an array out of bounds can lead to undefined behavior, crashes, or security issues, as it violates the memory allocation.
7. Which sorting algorithm is commonly used for arrays?
A. Linked list sort
B. Quick sort
C. Tree traversal
D. Hashing
Answer: B
Explanation: Quick sort is an efficient sorting algorithm often used for arrays due to its average time complexity of O(n log n).
8. What is a multi-dimensional array?
A. An array with only one dimension
B. An array of arrays, like a matrix
C. A dynamic array
D. An array that stores different data types
Answer: B
Explanation: A multi-dimensional array, such as a 2D array, is an array where each element is itself an array, allowing representation of tables or grids.
9. In Java, how do you declare a dynamic array?
A. int myArray[5];
B. ArrayList
C. int[] myArray = new int[5];
D. Both B and C
Answer: D
Explanation: In Java, you can use arrays like int[] myArray = new int[5] for fixed size, or ArrayList for dynamic resizing, making both options valid for dynamic needs.
10. What is the time complexity of accessing an element in an array by index?
A. O(1)
B. O(n)
C. O(log n)
D. O(n log n)
Answer: A
Explanation: Array access by index is constant time, O(1), because elements are stored in contiguous memory, allowing direct access.
11. How do you initialize an array in Python?
A. int myArray = {1, 2, 3};
B. myArray = [1, 2, 3]
C. array myArray(1, 2, 3);
D. declare myArray = new [1, 2, 3]
Answer: B
Explanation: In Python, arrays are typically handled as lists, initialized using square brackets, like myArray = [1, 2, 3].
12. What is a jagged array?
A. An array with equal-sized subarrays
B. An array of arrays where subarrays can have different lengths
C. A sorted array
D. A one-dimensional array
Answer: B
Explanation: A jagged array is a multi-dimensional array where each row (or subarray) can have a different number of elements, unlike a regular matrix.
13. Which method is used for linear search in an array?
A. Divide and conquer
B. Sequential checking of each element
C. Binary division
D. Hashing
Answer: B
Explanation: Linear search involves checking each element one by one until the desired element is found, with a time complexity of O(n).
14. Can arrays in C++ hold elements of different data types?
A. Yes, by default
B. No, arrays must hold elements of the same type
C. Only if using templates
D. Yes, using unions
Answer: B
Explanation: Standard arrays in C++ require all elements to be of the same data type; for mixed types, structures or other containers are used.
15. How do you pass an array to a function in C?
A. By value
B. By reference using pointers
C. It cannot be passed
D. Only as a string
Answer: B
Explanation: In C, arrays are passed to functions as pointers, effectively passing by reference, which allows the function to modify the original array.
16. What is the purpose of the sizeof operator with arrays in C?
A. To get the number of elements
B. To get the total memory size in bytes
C. To resize the array
D. To sort the array
Answer: B
Explanation: sizeof returns the total size of the array in bytes, not the number of elements directly; to get the count, divide by the size of one element.
17. In which scenario is an array more efficient than a linked list?
A. Frequent insertions and deletions
B. Random access to elements
C. Dynamic sizing
D. Storing heterogeneous data
Answer: B
Explanation: Arrays provide O(1) time for random access due to contiguous memory, making them more efficient than linked lists for this operation.
18. How do you reverse an array in place?
A. Using a loop to swap elements from start and end
B. Sorting it in descending order
C. Copying to a new array
D. Using recursion only
Answer: A
Explanation: Reversing an array in place involves swapping elements from the beginning and end indices and moving towards the center.
19. What is the binary search algorithm’s requirement for arrays?
A. The array must be sorted
B. It works on unsorted arrays
C. It requires a linked list
D. The array must be empty
Answer: A
Explanation: Binary search requires the array to be sorted to efficiently divide the search interval in half.
20. What are some common applications of arrays?
A. Storing lists of data like student grades
B. Implementing stacks and queues
C. Matrix operations in graphics
D. All of the above
Answer: D
Explanation: Arrays are versatile and used for storing lists, implementing data structures like stacks, and handling multi-dimensional data in applications like graphics.
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