MCQs

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Overall MCQs for Reference

Which of the following best describes an array in data science?
a. Collection of heterogeneous elements
b. Collection of elements stored at contiguous memory locations
c. Structure for random, unordered storage
d. Only used for text data
Answer: b. Collection of elements stored at contiguous memory locationssimplilearn+1
What is the primary advantage of arrays over linked lists?
a. Dynamic allocation
b. Random access of elements
c. Unlimited size
d. Always sorted
Answer: b. Random access of elementsgeeksforgeeks+1
Which time complexity does array element access by index have?
a. O(n)
b. O(log n)
c. O(1)
d. O(n^2)
Answer: c. O(1)tutorialspoint+1
What type of array is commonly used for storing tabular data?
a. One-dimensional
b. Ragged
c. Two-dimensional
d. Circular
Answer: c. Two-dimensionalgeeksforgeeks+1
Which operation is faster in arrays compared to linked lists?
a. Insertion in the middle
b. Deletion of the first element
c. Random access
d. Memory deallocation
Answer: c. Random accessgeeksforgeeks+1
What is the index of the first element in an array in most programming languages like C, Java, Python?
a. 0
b. 1
c. -1
d. 2
Answer: a. 0simplilearn+1
Arrays are suitable for which of the following scenarios?
a. Insertion and deletion in the middle
b. Fixed-size data storage
c. Variable data size
d. Only for primitive types
Answer: b. Fixed-size data storagewscubetech+1
What property of an array makes it cache friendly?
a. Linked memory locations
b. Contiguous memory storage
c. Storage by reference
d. None
Answer: b. Contiguous memory storagegeeksforgeeks+1
Which data structure uses arrays as its underlying storage?
a. Stack
b. Queue
c. Both a and b
d. Binary tree only
Answer: c. Both a and bgeeksforgeeks+1
What happens if you try to access an array index outside its declared bounds in C?
a. Returns zero
b. Exception is thrown
c. Undefined behavior
d. Accesses next element safely
Answer: c. Undefined behaviortutorialspoint+1
Which of these is NOT a valid characteristic of arrays?
a. Fixed-size
b. Stores elements of the same type
c. Allows dynamic resizing
d. Sequential storage
Answer: c. Allows dynamic resizingwscubetech+1
Arrays are best used when:
a. The size of the data is not known in advance
b. Frequent insertions and deletions are required
c. The size of the data is known and constant
d. None of the above
Answer: c. The size of the data is known and constantsimplilearn+1
In a two-dimensional array, A[m][n], how many elements can be stored?
a. m+n
b. m-n
c. mn
d. m^n
Answer: c. mnwscubetech+1
Which of these is an application of arrays in data science?
a. Image processing
b. String manipulation
c. Matrix operations
d. All of the above
Answer: d. All of the abovetrainings.internshala+1
Dynamic arrays offer which advantage over static arrays?
a. Constant random access
b. Ability to change size at runtime
c. Lower memory usage
d. Always sorted data
Answer: b. Ability to change size at runtimetrainings.internshala+1
The main disadvantage of arrays is:
a. Variable memory allocation
b. Fixed size
c. Variable access time
d. Inability to store same type
Answer: b. Fixed sizescribd+1
In most modern languages, what data structure is used to implement multi-dimensional arrays?
a. Linked lists of arrays
b. Nested arrays
c. Hash tables
d. Dictionaries
Answer: b. Nested arraysgeeksforgeeks+1
What is the output of accessing arr if arr = ?geeksforgeeks+4
a. 4
b. 3
c. 5
d. Array out of bounds
Answer: a. 4tutorialspoint+1
What is the time complexity for inserting an element at the end of an array (if space is available)?
a. O(1)
b. O(n)
c. O(log n)
d. O(n^2)
Answer: a. O(1)geeksforgeeks+1
In Python, arrays are most similar to which structure?
a. Dictionary
b. List
c. Tuple
d. Set
Answer: b. Listsimplilearn+1
What is the term for arrays that have dimensions more than two?
a. Linear arrays
b. Three-dimensional arrays
c. Higher-dimensional arrays
d. One-dimensional arrays
Answer: c. Higher-dimensional arrayswscubetech+1
How are elements of a 2D array typically accessed?
a. arr(row, column)
b. arr[column][row]
c. arr[row][column]
d. arr[row.column]
Answer: c. arr[row][column]simplilearn+1
Which operation is slowest in a static array?
a. Accessing an element
b. Inserting in the middle
c. Updating an element
d. Traversing
Answer: b. Inserting in the middlegeeksforgeeks+1
Arrays are often used to implement which algorithmic function?
a. Sorting
b. Traversal
c. Searching
d. All of the above
Answer: d. All of the abovetrainings.internshala+1
In C/C++, which declaration is correct for a one-dimensional array of 10 integers?
a. int arr(10);
b. int arr;trainings.internshala
c. arr int;trainings.internshala
d. array int;trainings.internshala
Answer: b. int arr;tutorialspoint+2
What is the default value of elements in a newly declared array in Java?
a. 0
b. Null
c. Undefined
d. 1
Answer: a. 0geeksforgeeks+1
Which access method is NOT possible with arrays?
a. Random access
b. Sequential access
c. LIFO
d. Indexed access
Answer: c. LIFOtutorialspoint+1
Which of these is a multidimensional array commonly used for in data science?
a. Database implementation
b. Representing images
c. Mathematical matrices
d. Both b and c
Answer: d. Both b and cgeeksforgeeks+1
Which of the following is true about array indices?
a. They always start at 1
b. Can be negative
c. Are always consecutive integers
d. Are characters
Answer: c. Are always consecutive integerswscubetech+1
Arrays in C are always passed to functions:
a. By value
b. By reference
c. By pointer
d. By both a and b
Answer: c. By pointersimplilearn+1
What happens if you try to insert an element into a fixed-size array that is already full?
a. The new element overwrites the last element
b. Error or overflow
c. Array resizes automatically
d. Nothing happens
Answer: b. Error or overflowscribd+1
Which of the following keywords is used to dynamically allocate arrays in C++?
a. malloc
b. free
c. new
d. create
Answer: c. newtutorialspoint+1
What is the primary use of arrays in scientific computing?
a. Data compression
b. Storing and computing matrix operations
c. File management
d. Web development
Answer: b. Storing and computing matrix operationsgeeksforgeeks+1
Which of the following best describes a sparse array?
a. Array with only non-zero elements
b. Array with most elements as zero
c. Multi-dimensional array
d. Any large array
Answer: b. Array with most elements as zerotrainings.internshala+1
In which scenario are jagged arrays useful?
a. When all rows have the same length
b. When rows have different lengths
c. Only for 1-dimensional data
d. For sorting only
Answer: b. When rows have different lengthswscubetech+1
Arrays in JavaScript allow which operations?
a. Add/remove elements from both ends
b. Fixed length
c. Only numeric values
d. Non-indexed access
Answer: a. Add/remove elements from both endsjavascript
Which array method in Python returns the length of the array or list?
a. count()
b. length()
c. len()
d. size()
Answer: c. len()geeksforgeeks
The linear search algorithm on an array has what time complexity in the worst case?
a. O(1)
b. O(n)
c. O(log n)
d. O(n^2)
Answer: b. O(n)wscubetech+1
Which property does NOT apply to arrays?
a. Stored in contiguous memory
b. Random access
c. Dynamic resizing (without extra structure)
d. Sequential index
Answer: c. Dynamic resizing (without extra structure)scribd+1
Which of the following is false about arrays?
a. Used for storing similar elements
b. Allows data to be stored at random positions
c. Provides fast access
d. Requires a defined data type
Answer: b. Allows data to be stored at random positionsscribd+1
In machine learning, which library is famous for providing highly optimized array operations?
a. NumPy
b. Pandas
c. Scikit-learn
d. Matplotlib
Answer: a. NumPyinterviewkickstart
Which array function reverses the elements in Python?
a. invert()
b. reverse()
c. flip()
d. back()
Answer: b. reverse()geeksforgeeks
For an array arr = , what is arr[-1] in Python?youtubetrainings.internshala
a. 10
b. 40
c. 0
d. Error
Answer: b. 40geeksforgeeks
Which is NOT a typical use of arrays in data science?
a. Matrix calculations
b. Fast lookup by index
c. Storing key-value pairs directly
d. Storing tabular data
Answer: c. Storing key-value pairs directlygeeksforgeeks+1
What is meant by “contiguous memory” in relation to arrays?
a. Space allocated at different places
b. Elements are stored together sequentially in memory
c. Elements are stored with gaps
d. Memory is reallocated for every new element
Answer: b. Elements are stored together sequentially in memoryscribd+1
How do multidimensional arrays aid in data visualization?
a. They cannot be visualized
b. By representing images, tables, and grids
c. Only for 1D data
d. Are used as strings
Answer: b. By representing images, tables, and gridstrainings.internshala+1
Which of the following is a property of static arrays?
a. Fixed size
b. Automatically resize
c. Accept different data types within the same array
d. Allow negative indices in C
Answer: a. Fixed sizescribd+1
In a sparse matrix, how are arrays used for efficiency?
a. Store every element including zeros
b. Store only non-zero elements efficiently
c. Replace arrays with stacks
d. Avoid using arrays
Answer: b. Store only non-zero elements efficientlygeeksforgeeks+1
What is the outcome of arr.pop() in Python (when arr is a list)?
a. Removes and returns the last element
b. Adds a new element
c. Returns array length
d. Removes the first element
Answer: a. Removes and returns the last elementgeeksforgeeks
Which array operation is used for finding a specific value in the array?
a. Sorting
b. Searching
c. Concatenation
d. Slicing
Answer: b. Searchingtrainings.internshala+1

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