Explore topic-wise MCQs in Arrays .

This section includes 100 Mcqs, each offering curated multiple-choice questions to sharpen your Arrays knowledge and support exam preparation. Choose a topic below to get started.

1.

Consider the declaration char street[10] = "abcdefghi"; Choose the correct remark(s)

A. &street and street will have different values
B. &street is meaningless
C. &street+1 and street+1 will have the same values
D. None of the above
Answer» E.
Discussion
2.

A file is preferable to an array of structures because

A. file lives even after the program that created it terminates
B. memory space will not be wasted
C. there are many system tools to manipulate files
D. All of the above
Answer» E.
Discussion
3.

Pick the correct answers if x is an one dimensional array, then

A. &x[ i ] is same as x + i - 1
B. *(x + 1) is same as *(&x [ i ])
C. *(x + i) is same as x[ i ]
D. both (b) & (c)
Answer» E.
Discussion
4.

Choose the correct statements

A. an entire array can be passed as an argument to a function
B. a part of an array can be passed as argument to a function
C. any change done to an array that is passed as an argument to a function will be local to the function
D. Both (a) & (b)
Answer» E.
Discussion
5.

While sorting a set of names, representing the names as an array of pointers is preferable to representing the names as a two dimensional array of characters because

A. storage needed will be proportional to the size of the data
B. execution will be faster
C. swapping process becomes easier and faster
D. All of the above
Answer» E.
Discussion
6.

If arr is a two dimensional array of 10 rows and 12 columns, then arr (5) logically points to the

A. sixth row
B. Fifth row
C. fifth column
D. sixth column
Answer» B. Fifth row
Discussion
7.

A set of names can be represented as a

A. two-dimensional array of characters
B. one-dimensional array of strings
C. one-dimensional array of pointers to character
D. All of above
Answer» E.
Discussion
8.

Which of the following concepts make extensive use of arrays?

A. Binary trees
B. Scheduling of processes
C. Caching
D. Spatial locality
Answer» E.
Discussion
9.

When does the ArrayIndexOutOfBoundsException occur?

A. Compile-time
B. Run-time
C. Not an error
D. Not an exception at all
Answer» C. Not an error
Discussion
10.

What is the output of the following piece of code? public class array { public static void main(String args[]) { int []arr = {1,2,3,4,5}; System.out.println(arr[5]); } }

A. 4
B. 5
C. ArrayIndexOutOfBoundsException
D. InavlidInputException
Answer» D. InavlidInputException
Discussion
11.

Minimum number of interchange needed to convert the array 89,19,40,14,17,12,10,2,5,7,11,6,9,70, into a heap with the maximum element at the root is

A. 1
B. 2
C. 3
Answer» D.
Discussion
12.

A one dimensional array A has indices 1....75.Each element is a string and takes up three memory words. The array is stored starting at location 1120 decimal. The starting address of A[49] is

A. 1167
B. 1164
C. 1264
D. 1169
Answer» D. 1169
Discussion
13.

If S is an array of 80 characters, then the value assigned to S through the statement scanf("%s",S) with input 12345 would be

A. "12345"
B. nothing since 12345 is an integer
C. S is an illegal name for string
D. %s cannot be used for reading in values of S
Answer» B. nothing since 12345 is an integer
Discussion
14.

For 'C' programming language

A. Constant expressions are evaluated at compile
B. String constants can be concatenated at compile time
C. Size of array should be known at compile time
D. All of these
Answer» E.
Discussion
15.

If x is an array of interger, then the value of &x[i] is same as

A. &x[i-1] + sizeof (int)
B. x + sizeof (int) * i
C. x+i
D. none of these
Answer» B. x + sizeof (int) * i
Discussion
16.

Below is an example of - int RollNum[30][4];

A. 3-D Array
B. 2-D Array
C. 1-D Array
D. 4-D Array
Answer» C. 1-D Array
Discussion
17.

O(N)(linear time) is better than O(1) constant time.

A. True
B. False
Answer» C.
Discussion
18.

In C Programming, If we need to store word "INDIA" then syntax is as below -

A. char name[6] = {'I','N','D','I','A',' 0'}
B. char name[6] = {"I","N","D","I","A"}
C. char name[];
D. D.
Answer» B. char name[6] = {"I","N","D","I","A"}
Discussion
19.

What is the output of the following piece of code? public class array { public static void main(String args[]) { int []arr = {1,2,3,4,5}; System.out.println(arr[2]); System.out.println(arr[4]); } }

A. 3 and 5
B. 5 and 3
C. 2 and 4
D. 4 and 2
Answer» B. 5 and 3
Discussion
20.

Which of the following is a correct way to declare a multidimensional array in Java?

A. int[] arr;
B. int arr[[]];
C. int[][]arr;
D. int[[]] arr;
Answer» D. int[[]] arr;
Discussion
21.

How do you instantiate an array in Java?

A. int arr[] = new int(3);
B. int arr[];
C. int arr[] = new int[3];
D. int arr() = new int(3);
Answer» D. int arr() = new int(3);
Discussion
22.

C does no automatic array bound checking. This is

A. true
B. false
C. C's asset
D. C's shortcoming
Answer» E.
Discussion
23.

If n has the value 3, then the statement a [++n] = n++ ;

A. assigns 3 to a [5]
B. assigns 4 to a [5]
C. assigns 4 to a [4]
D. what is assigned is compiler-dependent
Answer» E.
Discussion
24.

The following program main() { static char a[3][4] = {"abcd", "mnop", "fghi"}; putchar(**a); }

A. will not compile successfully
B. results in run-time error
C. prints garbage
D. none of the above
Answer» E.
Discussion
25.

Under which of the following conditions, the size of an one-dimensional array need not be specified?

A. when initialization is a part of definition
B. when it is a declaration
C. when it is a formal parameter and an actual argument
D. All of the above
Answer» E.
Discussion
26.

Consider the statement int val[2] [4] = { 1, 2, 3, 4, 5, 6, 7, 8} ; 4 will be the value of

A. val[0 ][ 3]
B. val[0][4]
C. val[1][1]
D. none of the above
Answer» B. val[0][4]
Discussion
27.

The following program main( ) { static int a[ ] = { 7, 8, 9 } ; printf( "%d", 2[ a ] + a[ 2 ] ) ; }

A. results in bus error
B. results in segmentation violation error
C. will not compile successfully
D. none of the above
Answer» E.
Discussion
28.

While passing an array as an actual argument, the function call must have the array name

A. with empty brackets
B. with its size
C. alone
D. none of the above
Answer» D. none of the above
Discussion
29.

The parameter passing mechanism for an array is

A. call by value
B. call by reference
C. call by value-result
D. None of the above
Answer» C. call by value-result
Discussion
30.

A string that is a formal parameter can be declared

A. An array with empty braces
B. A pointer to character
C. Both A and B
D. None of the above
Answer» D. None of the above
Discussion
31.

The information about an array used in program will be stored in

A. Symbol Table
B. Activation Record
C. Dope Vector
D. Both A and B
Answer» D. Both A and B
Discussion
32.

Array is an example of _______ type memory allocation

A. Compile time
B. Run time
C. Both A and B
D. None of the above
Answer» B. Run time
Discussion
33.

Array can be considered as set of elements stored in consecutive memory locations but having __________.

A. Same data type
B. Different data type
C. Same scope
D. None of these
Answer» B. Different data type
Discussion
34.

Which of the following correctly declares an array?

A. int geeks[20];
B. int geeks;
C. geeks{20};
D. array geeks[20];
Answer» B. int geeks;
Discussion
35.

A three dimensional array in C is declared as int A[x][y][z]. Consider that array elements are stored in row major order and indexing begins from 0. Here, the address of an item at the location A[p][q][r] can be computed as follows

A. &A[0][0][0] + w(y * z * q + z * p + r)
B. &A[0][0][0] + w(y * z * p + z*q + r)
C. &A[0][0][0] + w(x * y * p + z * q+ r)
D. &A[0][0][0] + w(x * y * q + z * p + r)
Answer» C. &A[0][0][0] + w(x * y * p + z * q+ r)
Discussion
36.

Let A[1...n] be an array of n distinct numbers. If i < j> A[j], then the pair (i, j) is called an inversion of A. What is the expected number of inversions in any permutation on n elements ?

A. n(n-1)/2
B. n(n-1)/4
C. n(n+1)/4
D. 2n[logn]
Answer» C. n(n+1)/4
Discussion
37.

Which of the following statements are correct about 6 used in the program? int num[6]; num[6]=21;

A. In the first statement 6 specifies a particular element, whereas in the second statement it specifies a type.
B. In the first statement 6 specifies a array size, whereas in the second statement it specifies a particular element of array.
C. In the first statement 6 specifies a particular element, whereas in the second statement it specifies a array size.
D. In both the statement 6 specifies array size.
Answer» C. In the first statement 6 specifies a particular element, whereas in the second statement it specifies a array size.
Discussion
38.

Which of the following statements are correct about an array? 1. The array int num[26]; can store 26 elements. 2. The expression num[1] designates the very first element in the array. 3. It is necessary to initialize the array at the time of declaration. 4. The declaration num[SIZE] is allowed if SIZE is a macro.

A. 1
B. 1,4
C. 2,3
D. 2,4
Answer» C. 2,3
Discussion
39.

What will be the output of the program if the array begins at address 65486? #include int main() { int arr[] = {12, 14, 15, 23, 45}; printf("%u, %u n", arr, &arr); return 0; }

A. 65486, 65488
B. 65486, 65486
C. 65486, 65490
D. 65486, 65487
Answer» C. 65486, 65490
Discussion
40.

Which of the following statements are correct about the program below? #include int main() { int size, i; scanf("%d", &size); int arr[size]; for(i=1; i<=size; i++) { scanf("%d", arr[i]); printf("%d", arr[i]); } return 0; }

A. The code is erroneous since the subscript for array used in for loop is in the range 1 to size.
B. The code is erroneous since the values of array are getting scanned through the loop.
C. The code is erroneous since the statement declaring array is invalid
D. The code is correct and runs successfully.
Answer» D. The code is correct and runs successfully.
Discussion
41.

What will be the output of the program if the array begins at 65472 and each integer occupies 2 bytes? #include int main() { int a[3][4] = {1, 2, 3, 4, 4, 3, 2, 1, 7, 8, 9, 0}; printf("%u, %u n", a+1, &a+1); return 0; }

A. 65474, 65476
B. 65480, 65496
C. 65480, 65488
D. 65474, 65488
Answer» C. 65480, 65488
Discussion
42.

What will be the output of the program ? #include int main() { int arr[1]={10}; printf("%d n", 0[arr]); return 0; }

A. 1
B. 10
C. 6
Answer» C. 6
Discussion
43.

Are the expressions arr and &arr same for an array of 10 integers?

A. Yes
B. No
Answer» C.
Discussion
44.

Predict the output of below code: #include int main() { int a[3][4] = {1, 2, 3, 4, 4, 3, 2, 1, 7, 8, 9, 0}; printf("%u, %u n", a+1, &a+1); return 0; }

A. 65430, 43569
B. 65239, 64763
C. 65480, 65496
D. 61123, 74123
Answer» D. 61123, 74123
Discussion
45.

Predict the output of below code: #include int main() { int a[5] = {5, 1, 15, 20, 25}; int i, j, m; i = ++a[1]; j = a[1]++; m = a[i++]; printf("%d, %d, %d", i, j, m); return 0; }

A. 2,5,15
B. 3, 2, 15
C. 1,2,5
D. 12,15,1
Answer» C. 1,2,5
Discussion
46.

If n has the value 3, then the statement

A. assigns 4 to a [4]
B. what is assigned is compiler-dependent
C. assigns 4 to a [5]
D. assigns 4 to a [6]
Answer» C. assigns 4 to a [5]
Discussion
47.

applications of a multidimensional array

A. Matrix-Multiplication
B. Minimum Spanning Tree
C. Finding connectivity between nodes
D. All the above
Answer» E.
Discussion
48.

What is Array?

A. Collection of different type of elements
B. Collection of similar type of elements
C. None of the above
D. Both A and C
Answer» C. None of the above
Discussion
49.

C does no automatic array bound checking. This is

A. True
B. False
C. C's asset
D. C's shortcoming
Answer» E.
Discussion
50.

Predict the output of below code: #include int main() { int ary[2][3][4], j = 20; ary[0][0] = &j; printf("%d n", *ary[0][0]); }

A. Junk Value
B. No output
C. Compile time Error
D. Address of j
Answer» D. Address of j
Discussion