Searching and Sorting - 2 - Free MCQ Practice Test with solutions, Software

Which of the following search algorithms require the input to be sorted in ascending order?

Which sorting algorithm has the worst-case time complexity of O(n^2)?

Which of the following is a stable sorting algorithm?

Which search algorithm has a time complexity of O(log n)?

Which sorting algorithm is known for its in-place sorting property?

What will be the output of the following code snippet?
#include <iostream>
using namespace std;

void selectionSort(int arr[], int size) {
   for (int i = 0; i < size - 1; i++) {
      int minIndex = i;
      for (int j = i + 1; j < size; j++) {
         if (arr[j] < arr[minIndex]) {
            minIndex = j;
         }
      }
      swap(arr[i], arr[minIndex]);
   }
}

int main() {
   int arr[] = {5, 2, 9, 1, 7};
   int size = sizeof(arr) / sizeof(arr[0]);

   selectionSort(arr, size);

   for (int i = 0; i < size; i++) {
      cout << arr[i] << " ";
   }
   return 0;
}

What will be the output of the following code snippet?
#include <iostream>
using namespace std;

void bubbleSort(int arr[], int size) {
   for (int i = 0; i < size - 1; i++) {
      for (int j = 0; j < size - i - 1; j++) {
         if (arr[j] > arr[j + 1]) {
            swap(arr[j], arr[j + 1]);
         }
      }
   }
}

int main() {
   int arr[] = {3, 8, 1, 6, 4};
   int size = sizeof(arr) / sizeof(arr[0]);

   bubbleSort(arr, size);

   for (int i = 0; i < size; i++) {
      cout << arr[i] << " ";
   }
   return 0;
}

What will be the output of the following code snippet?
#include <iostream>
using namespace std;

int binarySearch(int arr[], int low, int high, int target) {
   while (low <= high) {
      int mid = low + (high - low) / 2;

      if (arr[mid] == target) {
         return mid;
      }

      if (arr[mid] < target) {
         low = mid + 1;
      } else {
         high = mid - 1;
      }
   }
   return -1;
}

int main() {
   int arr[] = {2, 5, 8, 12, 16};
   int size = sizeof(arr) / sizeof(arr[0]);
   int target = 8;

   int index = binarySearch(arr, 0, size - 1, target);

   cout << "Element found at index: " << index;

   return 0;
}

What will be the output of the following code snippet?
#include <iostream>
using namespace std;

void insertionSort(int arr[], int size) {
   for (int i = 1; i < size; i++) {
      int key = arr[i];
      int j = i - 1;

      while (j >= 0 && arr[j] > key) {
         arr[j + 1] = arr[j];
         j = j - 1;
      }
      arr[j + 1] = key;
   }
}

int main() {
   int arr[] = {7, 3, 9, 2, 5};
   int size = sizeof(arr) / sizeof(arr[0]);

   insertionSort(arr, size);

   for (int i = 0; i < size; i++) {
      cout << arr[i] << " ";
   }
   return 0;
}

What will be the output of the following code snippet?
#include <iostream>
using namespace std;

int linearSearch(int arr[], int size, int target) {
   for (int i = 0; i < size; i++) {
      if (arr[i] == target) {
         return i;
      }
   }
   return -1;
}

int main() {
   int arr[] = {4, 9, 2, 7, 5};
   int size = sizeof(arr) / sizeof(arr[0]);
   int target = 7;

   int index = linearSearch(arr, size, target);

   cout << "Element found at index: " << index;

   return 0;
}

Which of the following sorting algorithms has the best average-case time complexity?

Which of the following search algorithms can be applied on a singly linked list?

Which sorting algorithm is the most suitable for sorting a large collection of elements with a small range of values?

Which sorting algorithm is an example of an in-place and stable sorting algorithm?

Which of the following is true about binary search?