1. What is an array in programming?

• A) A single value data structure
• B) A collection of variables of the same type
• C) A data structure that can hold multiple data types
• D) A function to manipulate data

2. How do you declare a one-dimensional array in C?

• A) int arr(5);
• B) int arr[5];
• C) array arr[5];
• D) arr[5] int;

3. Which of the following accesses the third element of an array named arr?

• A) arr[2]
• B) arr[3]
• C) arr[1]
• D) arr(2)

4. What will be the output of the following code?

                    int arr[3] = {1, 2, 3};
                    printf("%d", arr[1]);
                

• A) 1
• B) 2
• C) 3
• D) Error

5. What is the result of trying to access an out-of-bounds index in an array?

• A) It returns 0
• B) It produces a runtime error
• C) It leads to undefined behavior
• D) It returns the last element

6. Which of the following statements correctly passes an array to a function in C?

• A) func(arr);
• B) func(&arr);
• C) func(arr[]);
• D) func(arr[5]);

7. How do you define a two-dimensional array with 3 rows and 4 columns?

• A) int arr[3][4];
• B) int arr[4][3];
• C) int arr(3, 4);
• D) int arr{3, 4};

8. What is the output of the following code?

                    int arr[3] = {5, 10, 15};
                    printf("%d", arr[0] + arr[2]);
                

• A) 10
• B) 15
• C) 20
• D) 30

9. Which function is used to determine the size of an array in bytes?

• A) sizeof(array)
• B) length(array)
• C) size(array)
• D) count(array)

10. What is the primary advantage of using arrays?

• A) Dynamic memory allocation
• B) Ease of manipulation and retrieval of data
• C) Supports multiple data types
• D) Slower access time

11. Which of the following correctly initializes an array with values?

• A) int arr[] = {1, 2, 3};
• B) int arr = {1, 2, 3};
• C) int arr[3] = (1, 2, 3);
• D) int arr(1, 2, 3);

12. Which of the following can be used to access the elements of a two-dimensional array?

• A) Single index
• B) Two indices
• C) Using pointers only
• D) Any index

13. What will happen if you declare an array with a size of 0 in C?

• A) It is allowed and can be used
• B) It will cause a runtime error
• C) It will compile but cannot be used
• D) It will create an infinite loop

14. How do you pass an individual element of an array to a function?

• A) func(arr);
• B) func(arr[i]);
• C) func(&arr);
• D) func(arr[5]);

15. In which scenario is using an array more efficient than using separate variables?

• A) When there are fewer than 10 variables
• B) When variables are of different data types
• C) When the number of variables is large and of the same type
• D) When the data is not related

16. What will be the output of the following code?
int arr[3] = {2, 4, 6};
printf("%d", arr[0] * arr[1]);

• A) 8
• B) 12
• C) 16
• D) 2

17. What does the following declaration represent?
int (*ptr)[5];

• A) Pointer to an integer
• B) Pointer to an array of 5 integers
• C) Array of 5 pointers
• D) Pointer to an array of integers

18. Which of the following correctly accesses the last element of an array named arr with 5 elements?

• A) arr[4]
• B) arr[5]
• C) arr[last]
• D) arr[-1]

19. How do you dynamically allocate memory for an array of 10 integers?

• A) int arr[10];
• B) int *arr = malloc(10 * sizeof(int));
• C) int arr = (int*)malloc(10);
• D) int *arr = new int[10];

20. What will happen if you try to assign a new value to an element of an array declared as const?

• A) It will compile without errors
• B) It will cause a compilation error
• C) It will run but ignore the assignment
• D) It will create a new variable