MCQs

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Overall MCQs for Reference

Which of these best describes an array?
a. Hierarchical data structure
b. Container of objects of similar types
c. Immutable once initialized
d. Not a data structure
Answer: bsanfoundry+1
What is the primary advantage of using arrays?
a. Stores mixed data types
b. Elements cannot be sorted
c. Index starts at 1
d. Easier to store elements of same type
Answer: dsanfoundry+2
Arrays store elements in:
a. Random memory locations
b. Linked lists
c. Contiguous memory locations
d. Separate storage devices
Answer: cscribd+1
Which of the following is the correct way to declare an array in C?
a. int arr = (1,2,3);testbook
b. int arr(3) = {1,2,3};
c. int arr = {1,2,3};testbook
d. int arr(3) = (1,2,3);
Answer: cexamveda+2
What is the worst-case complexity of searching for an element in an unsorted array?
a. O(1)
b. O(n)
c. O(log n)
d. O(n log n)
Answer: bsanfoundry+1
What is the result of initializing an array with a size greater than the number of elements inserted?
a. Wastage of memory
b. No wastage
c. Data corruption
d. Stack overflow
Answer: asanfoundry+1
Which of the following correctly initializes a one-dimensional array in C?
a. num = {1,2,3,4};sanfoundry
b. num = {1;2;3;4};sanfoundry
c. num = 0;sanfoundry
d. num = {1 2 3 4};sanfoundry
Answer: aexamveda+1
Which data structure is most efficient for implementing a circular queue using an array?
a. Stack
b. Circular Linked List
c. Circular Buffer
d. Binary Heap
Answer: cscribd
In Python, which data type is used to represent arrays for scientific computation?
a. List
b. Numpy ndarray
c. Set
d. Dictionary
Answer: binterviewkickstart
Accessing any element in an array by index has what time complexity?
a. O(log n)
b. O(n)
c. O(1)
d. O(n^2)
Answer: cscribd+1
Which of the following is NOT an advantage of arrays?
a. Random access of elements
b. Fixed size after declaration
c. Elements of same data type
d. Contiguous storage
Answer: bsanfoundry+1
What is a multidimensional array?
a. A single data structure containing rows and columns
b. An array of pointers
c. An array accessed by a single subscript
d. Non-contiguous structure
Answer: atestbook+1
How do you instantiate an array in Java?
a. int arr[] = new int(3);
b. int arr[];
c. int arr[] = new int;testbook
d. int arr() = new int(3);
Answer: cinterviewbit+1
What is the index value of the first element in an array?
a. 1
b. 0
c. -1
d. 10
Answer: bexamveda+2
The elements of an array are separated by:
a. Spaces
b. Semicolons
c. Commas
d. Colons
Answer: cexamveda+1
Which operation is easiest to perform on an array?
a. Insertion
b. Access by index
c. Deletion by value
d. Searching for element
Answer: bsanfoundry+1
Which of the following causes maximum memory wastage in arrays?
a. Over-insertion
b. Under-utilization of declared size
c. Using two-dimensional arrays
d. Accessing with negative indices
Answer: bsanfoundry+1
Which is a disadvantage of arrays?
a. Dynamic resizing capability
b. Fixed size after creation
c. Easy element access
d. Efficient memory usage
Answer: bsanfoundry+1
What will result in an ArrayIndexOutOfBoundsException in Java?
a. Accessing valid element
b. Initializing correctly
c. Accessing index beyond array size
d. Declaring without instantiation
Answer: csanfoundry
What is the result of sizeof(arr)/sizeof(arr) in C?
a. Number of bytes in an array
b. Number of elements in array
c. Length of string stored
d. Highest index of array
Answer: btestbook
What is the correct syntax to declare a two-dimensional array in C?
a. int arr;testbook+1
b. int arr{3};sanfoundry
c. int arr;testbook+1
d. int arr;testbook+1
Answer: cexamveda+1
Which array data structure is suited for sparse data?
a. Regular array
b. Sparse array
c. HashMap
d. Linked list
Answer: bsanfoundry
Which is the correct way to store student grades using an array?
a. Use a single variable
b. Store grades in a two-dimensional array
c. Store grades in a stack
d. Use a tree structure
Answer: bsanfoundry+1
Which operation is not possible if an array is of fixed size?
a. Access
b. Insertion at end
c. Dynamic resizing
d. Initialization
Answer: csanfoundry+1
Which of the following is a valid way to initialize an array in Python using NumPy?
a. arr =geeksforgeeks+2
b. arr = np.array()geeksforgeeks+2
c. arr = dict()geeksforgeeks+2
d. arr = tuple()geeksforgeeks+2
Answer: binterviewkickstart
Which of these best identifies the logical organization of array elements?
a. Tree-like
b. Linked-list
c. Linear
d. Non-linear
Answer: cscribd+1
Which of the following functions effectively finds the missing number in a range array?
a. Hashing
b. Sorting and scanning
c. XOR operation
d. Both b and c
Answer: dscribd
What happens when you try to add more elements to a static array than its capacity?
a. Array is resized
b. Exception is thrown
c. Elements are overwritten
d. Array is deleted
Answer: bsanfoundry+1
Which of the following concepts uses arrays extensively?
a. Binary trees
b. Scheduling processes
c. Caching
d. Spatial locality
Answer: dscribd+1
What is the output of len(arr) in Python for an array of 5 elements?
a. 4
b. 5
c. 0
d. 1
Answer: binterviewkickstart
Which data structure can be efficiently implemented using arrays?
a. Stack
b. Queue
c. Heap
d. All of the above
Answer: dscribd+1
Which of the following types stores bits as its elements?
a. Dynamic array
b. Bit array
c. Suffix array
d. Matrix array
Answer: bsanfoundry
Which is used to initialize all elements of an array to zero in C?
a. int arr = {0};interviewkickstart
b. int arr = (0);interviewkickstart
c. int arr = ;interviewkickstart
d. int arr;interviewkickstart
Answer: ainterviewbit+1
Which operation takes the least time in an array?
a. Traversal
b. Element access by index
c. Searching unsorted array
d. Reversing array
Answer: bexamveda+1
Which library in Python is optimized for array manipulation in data science?
a. Pandas
b. NumPy
c. SciPy
d. Matplotlib
Answer: binterviewkickstart
Which of the following operations is NOT easy to perform on arrays?
a. Random access
b. Dynamic resizing
c. Traversal
d. Insertion at known index
Answer: bsanfoundry+1
What is the main disadvantage of using arrays for large-scale scientific data?
a. Easy access
b. Fixed memory allocation
c. Fast performance
d. Contiguous storage
Answer: bsanfoundry+1
Which of these describes a sparse array?
a. Array with no elements
b. Array where most elements are zero
c. Array with random values
d. Array with repeated elements
Answer: bsanfoundry
What does arr represent in a two-dimensional array?testbook
a. First row, third column
b. First column, third row
c. Fourth column, first row
d. Third row, first column
Answer: atestbook+1
Which language has built-in support for arrays and array-like structures in data science?
a. Python
b. Java
c. R
d. All of the above
Answer: dinterviewbit+1
Which of these is true about array indexes?
a. Index can be negative
b. Index must be positive
c. Index starts from 1 in most languages
d. Index starts from 0 in most languages
Answer: dexamveda+2
The time complexity for accessing an element in a large array is:
a. O(1)
b. O(log n)
c. O(n)
d. O(n^2)
Answer: ascribd+1
Which of the following data structures cannot be implemented using arrays alone?
a. Linked list
b. Stack
c. Queue
d. Heap
Answer: asanfoundry+1
What is the output of arr.size for a NumPy array arr = np.array()?geeksforgeeks+4
a. 5
b. 4
c. 3
d. 1
Answer: ainterviewkickstart
Which element of an array can be accessed as arr[-1] in Python?
a. First element
b. Last element
c. Second element
d. Middle element
Answer: binterviewkickstart
What is the primary use of arrays in data visualization?
a. Store labels
b. Store numerical data points
c. Generate titles
d. Index images
Answer: bscribd+1
Which of these makes arrays suitable for high-performance computation?
a. Linked allocation
b. Contiguous storage
c. Slow insertion
d. Random data types
Answer: bsanfoundry+1
What is the output of the expression sum(arr) for arr = in Python?geeksforgeeks+3
a. 10
b. 1
c. 4
d. 0
Answer: ainterviewkickstart
Which method is used to reshape a NumPy array in Python?
a. reshape()
b. resize()
c. flatten()
d. heap()
Answer: ainterviewkickstart
What happens if you delete an array element in mid-position in C?
a. All subsequent elements shift left
b. All elements shift right
c. Array automatically resizes
d. Array stays unchanged
Answer: asanfoundry+1

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