Objective Questions

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

Correct Answer: (B) A collection of variables of the same type.

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;

Correct Answer: (B) int arr[5];

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)

Correct Answer: (A) 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

Correct Answer: (B) 2

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

Correct Answer: (C) It leads to undefined behavior.

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]);

Correct Answer: (A) func(arr);

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};

Correct Answer: (A) 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

Correct Answer: (D) 20

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)

Correct Answer: (A) sizeof(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

Correct Answer: (B) Ease of manipulation and retrieval of data.

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);

Correct Answer: (A) 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

Correct Answer: (B) Two indices.

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

Correct Answer: (C) It will compile but cannot be used.

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]);

Correct Answer: (B) func(arr[i]);

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

Correct Answer: (C) When the number of variables is large and of the same type.

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

Correct Answer: (B) 8

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

Correct Answer: (B) Pointer to an array of 5 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]

Correct Answer: (A) arr[4]

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];

Correct Answer: (B) int *arr = malloc(10 * sizeof(int));

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

Correct Answer: (B) It will cause a compilation error.

4.4 - Arrays in Programming.

4.4.1 - Passing Array to Function.