All Exams >
EmSAT Achieve >
Python for EmSAT Achieve >
All Questions
All questions of 2D Arrays for EmSAT Achieve Exam
What is the output of the following code snippet?
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print(arr[1:])- a)[[4, 5, 6]]
- b)[[2, 3], [5, 6], [8, 9]]
- c)[[4, 5, 6], [7, 8, 9]]
- d)[[1, 2, 3], [4, 5, 6], [7, 8, 9]]
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print(arr[1:])
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print(arr[1:])
a)
[[4, 5, 6]]
b)
[[2, 3], [5, 6], [8, 9]]
c)
[[4, 5, 6], [7, 8, 9]]
d)
[[1, 2, 3], [4, 5, 6], [7, 8, 9]]
|
Sameer Al Mazroui answered |
Output Explanation:
The code snippet provided creates a 2-dimensional list called 'arr' with three sublists. Each sublist contains three elements.
The line 'print(arr[1:])' is using slicing to retrieve a sublist from index 1 to the end of the list 'arr'.
The output of this code snippet will be:
[[4, 5, 6], [7, 8, 9]]
Explanation:
- The slicing notation 'arr[1:]' retrieves all elements starting from index 1 to the end of the list 'arr'.
- In Python, indexing starts from 0, so 'arr[1:]' includes the sublist at index 1 and all the sublists after it.
- Therefore, the output is a new list containing the sublists: '[4, 5, 6]' and '[7, 8, 9]'.
Summary:
The output of the code snippet is [[4, 5, 6], [7, 8, 9]]. Using slicing with 'arr[1:]' retrieves all sublists starting from index 1 to the end of the list 'arr'.
The code snippet provided creates a 2-dimensional list called 'arr' with three sublists. Each sublist contains three elements.
The line 'print(arr[1:])' is using slicing to retrieve a sublist from index 1 to the end of the list 'arr'.
The output of this code snippet will be:
[[4, 5, 6], [7, 8, 9]]
Explanation:
- The slicing notation 'arr[1:]' retrieves all elements starting from index 1 to the end of the list 'arr'.
- In Python, indexing starts from 0, so 'arr[1:]' includes the sublist at index 1 and all the sublists after it.
- Therefore, the output is a new list containing the sublists: '[4, 5, 6]' and '[7, 8, 9]'.
Summary:
The output of the code snippet is [[4, 5, 6], [7, 8, 9]]. Using slicing with 'arr[1:]' retrieves all sublists starting from index 1 to the end of the list 'arr'.
What is the time complexity for accessing an element in a 2D array?- a)O(1)
- b)O(n)
- c)O(log n)
- d)O(n2)
Correct answer is option 'A'. Can you explain this answer?
What is the time complexity for accessing an element in a 2D array?
a)
O(1)
b)
O(n)
c)
O(log n)
d)
O(n2)
|
|
Sonal Yadav answered |
Accessing an element in a 2D array takes constant time because the position of the element is known based on the row and column indices.
Given a 2D array "matrix" of size m x n, how would you swap the elements of the matrix diagonally?- a)Iterate over each element in the matrix and swap it with its diagonal element.
- b)Transpose the matrix and reverse each row.
- c)Create a new matrix and copy elements diagonally from the original matrix.
- d)None of the above.
Correct answer is option 'A'. Can you explain this answer?
Given a 2D array "matrix" of size m x n, how would you swap the elements of the matrix diagonally?
a)
Iterate over each element in the matrix and swap it with its diagonal element.
b)
Transpose the matrix and reverse each row.
c)
Create a new matrix and copy elements diagonally from the original matrix.
d)
None of the above.
|
Aisha Hani Al Wahidi answered |
Can you please provide more information about the 2D array? What is the size of the array and what kind of data does it contain? Additionally, what do you want to do with the array?
What will be the output of the following code snippet?
array = [[1, 2, 3], [4, 5, 6]]
print(sum(array[0]))- a)6
- b)10
- c)15
- d)21
Correct answer is option 'A'. Can you explain this answer?
What will be the output of the following code snippet?
array = [[1, 2, 3], [4, 5, 6]]
print(sum(array[0]))
array = [[1, 2, 3], [4, 5, 6]]
print(sum(array[0]))
a)
6
b)
10
c)
15
d)
21
|
Zayed Al Rashid answered |
Explanation:
The output of the code snippet will be 6.
To understand why, let's break down the code:
1. The variable "array" is assigned a 2-dimensional list: [[1, 2, 3], [4, 5, 6]]. This is a list of two sublists, each containing three elements.
2. The "sum()" function is used to calculate the sum of the elements in the first sublist of "array" (array[0]). In this case, the first sublist is [1, 2, 3].
3. The sum of the elements in [1, 2, 3] is 1 + 2 + 3 = 6.
Therefore, the output of the code snippet is 6.
The output of the code snippet will be 6.
To understand why, let's break down the code:
1. The variable "array" is assigned a 2-dimensional list: [[1, 2, 3], [4, 5, 6]]. This is a list of two sublists, each containing three elements.
2. The "sum()" function is used to calculate the sum of the elements in the first sublist of "array" (array[0]). In this case, the first sublist is [1, 2, 3].
3. The sum of the elements in [1, 2, 3] is 1 + 2 + 3 = 6.
Therefore, the output of the code snippet is 6.
What will be the output of the following code snippet?
array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print(array[1][2])- a)1
- b)2
- c)3
- d)6
Correct answer is option 'C'. Can you explain this answer?
What will be the output of the following code snippet?
array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print(array[1][2])
array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print(array[1][2])
a)
1
b)
2
c)
3
d)
6
|
|
Sonal Yadav answered |
The code snippet accesses the element at row 1, column 2 in the 2D array and prints its value, which is 6.
What will be the output of the following code snippet?
arr = [[1, 2], [3, 4, 5], [6, 7, 8, 9]]
print(len(arr[1]))- a)1
- b)2
- c)3
- d)4
Correct answer is option 'D'. Can you explain this answer?
What will be the output of the following code snippet?
arr = [[1, 2], [3, 4, 5], [6, 7, 8, 9]]
print(len(arr[1]))
arr = [[1, 2], [3, 4, 5], [6, 7, 8, 9]]
print(len(arr[1]))
a)
1
b)
2
c)
3
d)
4
|
|
Sonal Yadav answered |
The code snippet uses the len() function to get the length of the second row of the 2D array. The length is 4.
What is the output of the following code snippet?
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
sum = 0
for row in arr:
for elem in row:
sum += elem
print(sum)
- a)9
- b)15
- c)45
- d)36
Correct answer is option 'C'. Can you explain this answer?
What is the output of the following code snippet?
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
sum = 0
for row in arr:
for elem in row:
sum += elem
print(sum)
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
sum = 0
for row in arr:
for elem in row:
sum += elem
print(sum)
a)
9
b)
15
c)
45
d)
36
|
|
Sonal Yadav answered |
The code snippet calculates the sum of all elements in the 2D array. The sum will be 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45.
Which of the following statements about 2D arrays in Python is true?- a)2D arrays are always rectangular in shape.
- b)2D arrays can have different data types in each row.
- c)2D arrays are not supported in Python.
- d)2D arrays can only store numerical values.
Correct answer is option 'B'. Can you explain this answer?
Which of the following statements about 2D arrays in Python is true?
a)
2D arrays are always rectangular in shape.
b)
2D arrays can have different data types in each row.
c)
2D arrays are not supported in Python.
d)
2D arrays can only store numerical values.
|
|
Sonal Yadav answered |
In Python, 2D arrays can have different data types in each row. This is because each row can be considered as a separate 1D array.
What is the output of the following code snippet?
arr = [[1, 2], [3, 4], [5, 6]]
print([arr[i][j] for i in range(len(arr)) for j in range(len(arr[i]))])- a)[1, 2, 3, 4, 5, 6]
- b)[1, 3, 5, 2, 4, 6]
- c)[[1, 2], [3, 4], [5, 6]]
- d)[[1, 3, 5], [2, 4, 6]]
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
arr = [[1, 2], [3, 4], [5, 6]]
print([arr[i][j] for i in range(len(arr)) for j in range(len(arr[i]))])
arr = [[1, 2], [3, 4], [5, 6]]
print([arr[i][j] for i in range(len(arr)) for j in range(len(arr[i]))])
a)
[1, 2, 3, 4, 5, 6]
b)
[1, 3, 5, 2, 4, 6]
c)
[[1, 2], [3, 4], [5, 6]]
d)
[[1, 3, 5], [2, 4, 6]]
|
|
Sana Ameer Al Aswad answered |
Explanation:
Given Code:
arr = [[1, 2], [3, 4], [5, 6]]
print([arr[i][j] for i in range(len(arr)) for j in range(len(arr[i]))])
Explanation:
Nested List Comprehension:
- The given code snippet uses nested list comprehension to iterate over each element in the 2D list 'arr'.
- The outer loop iterates over each sublist in 'arr' using 'i'.
- The inner loop iterates over each element in the sublist using 'j'.
- The list comprehension extracts each element from the sublist using the indices 'i' and 'j' and stores them in a new list.
Output:
- The output of the code snippet is [1, 2, 3, 4, 5, 6].
- This is because the list comprehension extracts each element from the 2D list 'arr' in a row-wise manner.
- The elements are extracted in the order they appear in the 2D list.
Therefore, the correct answer is option 'A' [1, 2, 3, 4, 5, 6].
Given Code:
arr = [[1, 2], [3, 4], [5, 6]]
print([arr[i][j] for i in range(len(arr)) for j in range(len(arr[i]))])
Explanation:
Nested List Comprehension:
- The given code snippet uses nested list comprehension to iterate over each element in the 2D list 'arr'.
- The outer loop iterates over each sublist in 'arr' using 'i'.
- The inner loop iterates over each element in the sublist using 'j'.
- The list comprehension extracts each element from the sublist using the indices 'i' and 'j' and stores them in a new list.
Output:
- The output of the code snippet is [1, 2, 3, 4, 5, 6].
- This is because the list comprehension extracts each element from the 2D list 'arr' in a row-wise manner.
- The elements are extracted in the order they appear in the 2D list.
Therefore, the correct answer is option 'A' [1, 2, 3, 4, 5, 6].
Given a 2D array "matrix" of size m x n, how would you check if the matrix is symmetric?- a)Transpose the matrix and compare it with the original matrix.
- b)Iterate over each element and check if the corresponding element is the same in the transposed matrix.
- c)Use the numpy.transpose() function and compare it with the original matrix.
- d)None of the above.
Correct answer is option 'B'. Can you explain this answer?
Given a 2D array "matrix" of size m x n, how would you check if the matrix is symmetric?
a)
Transpose the matrix and compare it with the original matrix.
b)
Iterate over each element and check if the corresponding element is the same in the transposed matrix.
c)
Use the numpy.transpose() function and compare it with the original matrix.
d)
None of the above.
|
|
Sonal Yadav answered |
To check if a matrix is symmetric, we can iterate over each element and compare it with the corresponding element in the transposed matrix. If all corresponding elements are the same, the matrix is symmetric.
Which module in Python provides functions for working with 2D arrays?- a)numpy
- b)pandas
- c)math
- d)random
Correct answer is option 'A'. Can you explain this answer?
Which module in Python provides functions for working with 2D arrays?
a)
numpy
b)
pandas
c)
math
d)
random
|
|
Sonal Yadav answered |
The numpy module provides functions for working with 2D arrays in Python.
What will be the output of the following code snippet?
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print(arr[1][2])- a)1
- b)5
- c)6
- d)8
Correct answer is option 'C'. Can you explain this answer?
What will be the output of the following code snippet?
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print(arr[1][2])
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print(arr[1][2])
a)
1
b)
5
c)
6
d)
8
|
|
Sonal Yadav answered |
The code snippet accesses the element at the second row (index 1) and third column (index 2) of the 2D array. The value is 6.
What is a 2D array in Python?- a)A list of lists
- b)A single list with multiple dimensions
- c)A tuple of tuples
- d)A dictionary of dictionaries
Correct answer is option 'A'. Can you explain this answer?
What is a 2D array in Python?
a)
A list of lists
b)
A single list with multiple dimensions
c)
A tuple of tuples
d)
A dictionary of dictionaries
|
|
Sonal Yadav answered |
A 2D array in Python is represented as a list of lists. Each inner list represents a row in the array.
What will be the output of the following code snippet?
arr = [[1, 2], [3, 4], [5, 6]]
print(arr[-1][-1])- a)1
- b)2
- c)5
- d)6
Correct answer is option 'D'. Can you explain this answer?
What will be the output of the following code snippet?
arr = [[1, 2], [3, 4], [5, 6]]
print(arr[-1][-1])
arr = [[1, 2], [3, 4], [5, 6]]
print(arr[-1][-1])
a)
1
b)
2
c)
5
d)
6
|
|
Sonal Yadav answered |
The code snippet accesses the last element of the last row in the 2D array. The value is 6.
What will be the output of the following code snippet?
array = [[1, 2], [3, 4]]
print(len(array))- a)1
- b)2
- c)3
- d)4
Correct answer is option 'B'. Can you explain this answer?
What will be the output of the following code snippet?
array = [[1, 2], [3, 4]]
print(len(array))
array = [[1, 2], [3, 4]]
print(len(array))
a)
1
b)
2
c)
3
d)
4
|
|
Sonal Yadav answered |
The len() function returns the number of elements in the given list. In this case, it returns 2, which is the number of rows in the 2D array.
What will be the output of the following code snippet?
arr = [[1, 2], [3, 4], [5, 6]]
print(arr[-2][0])- a)1
- b)2
- c)3
- d)4
Correct answer is option 'C'. Can you explain this answer?
What will be the output of the following code snippet?
arr = [[1, 2], [3, 4], [5, 6]]
print(arr[-2][0])
arr = [[1, 2], [3, 4], [5, 6]]
print(arr[-2][0])
a)
1
b)
2
c)
3
d)
4
|
|
Sonal Yadav answered |
The code snippet accesses the first element of the second-to-last row in the 2D array. The value is 3.
Given a 2D array "matrix" of size m x n, how would you find the row with the highest sum of elements?- a)Iterate over each row and calculate the sum of elements, keeping track of the row with the highest sum.
- b)Use the numpy.sum() function on each row and find the maximum value.
- c)Sort the rows based on the sum of elements and select the first row.
- d)None of the above.
Correct answer is option 'A'. Can you explain this answer?
Given a 2D array "matrix" of size m x n, how would you find the row with the highest sum of elements?
a)
Iterate over each row and calculate the sum of elements, keeping track of the row with the highest sum.
b)
Use the numpy.sum() function on each row and find the maximum value.
c)
Sort the rows based on the sum of elements and select the first row.
d)
None of the above.
|
|
Sonal Yadav answered |
To find the row with the highest sum of elements, we need to iterate over each row, calculate the sum of elements in each row, and keep track of the row with the highest sum.
Given a 2D array "matrix" of size m x n, how would you calculate the sum of all elements in the matrix?- a)Use nested loops to iterate over each element and add them.
- b)Use the numpy.sum() function on the matrix.
- c)Use the built-in sum() function on the matrix.
- d)None of the above.
Correct answer is option 'A'. Can you explain this answer?
Given a 2D array "matrix" of size m x n, how would you calculate the sum of all elements in the matrix?
a)
Use nested loops to iterate over each element and add them.
b)
Use the numpy.sum() function on the matrix.
c)
Use the built-in sum() function on the matrix.
d)
None of the above.
|
|
Sonal Yadav answered |
To calculate the sum of all elements in a matrix, we can use nested loops to iterate over each element and add them together.
Which of the following operations is not valid for a 2D array?- a)Accessing elements by index
- b)Appending new rows
- c)Deleting rows or columns
- d)Transposing the array
Correct answer is option 'B'. Can you explain this answer?
Which of the following operations is not valid for a 2D array?
a)
Accessing elements by index
b)
Appending new rows
c)
Deleting rows or columns
d)
Transposing the array
|
|
Sonal Yadav answered |
Appending new rows to a 2D array is not a valid operation. The number of columns must be consistent across all rows.
What will be the output of the following code snippet?
array = [[1, 2, 3], [4, 5, 6]]
print(max(array[1]))- a)1
- b)2
- c)3
- d)6
Correct answer is option 'D'. Can you explain this answer?
What will be the output of the following code snippet?
array = [[1, 2, 3], [4, 5, 6]]
print(max(array[1]))
array = [[1, 2, 3], [4, 5, 6]]
print(max(array[1]))
a)
1
b)
2
c)
3
d)
6
|
|
Sonal Yadav answered |
The max() function returns the maximum value from the given list. In this case, it returns 6, which is the maximum value in the second row of the 2D array.
What is the correct way to access an element in a 2D array in Python?- a)array[i, j]
- b)array[i][j]
- c)array[i][j] = value
- d)array(i, j)
Correct answer is option 'B'. Can you explain this answer?
What is the correct way to access an element in a 2D array in Python?
a)
array[i, j]
b)
array[i][j]
c)
array[i][j] = value
d)
array(i, j)
|
|
Sonal Yadav answered |
To access an element in a 2D array, we use the syntax array[i][j], where i represents the row index and j represents the column index.
What is the output of the following code snippet?
arr = [[1, 2], [3, 4], [5, 6]]
print([arr[i][i] for i in range(len(arr))])- a)[1, 4, 6]
- b)[1, 3, 5]
- c)[1, 2, 3]
- d)[2, 4, 6]
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
arr = [[1, 2], [3, 4], [5, 6]]
print([arr[i][i] for i in range(len(arr))])
arr = [[1, 2], [3, 4], [5, 6]]
print([arr[i][i] for i in range(len(arr))])
a)
[1, 4, 6]
b)
[1, 3, 5]
c)
[1, 2, 3]
d)
[2, 4, 6]
|
|
Sonal Yadav answered |
The code snippet uses a list comprehension to extract the diagonal elements from the 2D array. The output will be [1, 4, 6].
What is a 2D array in Python?- a)A collection of elements of different data types
- b)A list of lists, where each inner list represents a row of elements
- c)An array with two dimensions
- d)A dictionary with two keys and values
Correct answer is option 'B'. Can you explain this answer?
What is a 2D array in Python?
a)
A collection of elements of different data types
b)
A list of lists, where each inner list represents a row of elements
c)
An array with two dimensions
d)
A dictionary with two keys and values
|
|
Sonal Yadav answered |
In Python, a 2D array is typically represented as a list of lists. It is a data structure that allows you to store elements in a grid-like format with rows and columns. Each inner list within the main list represents a row of elements, and the length of each inner list determines the number of columns in the 2D array.
Which of the following methods can be used to iterate over all elements in a 2D array?- a)for i in range(len(array))
- b)for i in array
- c)for i in range(len(array[0]))
- d)for i in range(len(array)): for j in range(len(array[i]))
Correct answer is option 'D'. Can you explain this answer?
Which of the following methods can be used to iterate over all elements in a 2D array?
a)
for i in range(len(array))
b)
for i in array
c)
for i in range(len(array[0]))
d)
for i in range(len(array)): for j in range(len(array[i]))
|
|
Sonal Yadav answered |
To iterate over all elements in a 2D array, we use nested loops. The outer loop iterates over the rows, and the inner loop iterates over the columns.
What is the time complexity to access an element in a 2D array with n rows and m columns?- a)O(1)
- b)O(n)
- c)O(m)
- d)O(n*m)
Correct answer is option 'A'. Can you explain this answer?
What is the time complexity to access an element in a 2D array with n rows and m columns?
a)
O(1)
b)
O(n)
c)
O(m)
d)
O(n*m)
|
|
Sonal Yadav answered |
Accessing an element in a 2D array with n rows and m columns takes constant time, O(1), as the indexing operation is direct.
What is the shape of a 2D array with n rows and m columns?- a)(n, m)
- b)(m, n)
- c)(n + m)
- d)(n * m)
Correct answer is option 'A'. Can you explain this answer?
What is the shape of a 2D array with n rows and m columns?
a)
(n, m)
b)
(m, n)
c)
(n + m)
d)
(n * m)
|
|
Sonal Yadav answered |
The shape of a 2D array with n rows and m columns is represented as (n, m).
Given a 2D array "matrix" of size m x n, how would you rotate the matrix 90 degrees clockwise?- a)Transpose the matrix and reverse each row.
- b)Reverse each column and transpose the matrix.
- c)Reverse each row and transpose the matrix.
- d)None of the above.
Correct answer is option 'C'. Can you explain this answer?
Given a 2D array "matrix" of size m x n, how would you rotate the matrix 90 degrees clockwise?
a)
Transpose the matrix and reverse each row.
b)
Reverse each column and transpose the matrix.
c)
Reverse each row and transpose the matrix.
d)
None of the above.
|
|
Sonal Yadav answered |
To rotate a matrix 90 degrees clockwise, we need to reverse each row and then transpose the matrix.
Which module in Python provides functions to work with 2D arrays efficiently?- a)numpy
- b)math
- c)random
- d)collections
Correct answer is option 'A'. Can you explain this answer?
Which module in Python provides functions to work with 2D arrays efficiently?
a)
numpy
b)
math
c)
random
d)
collections
|
|
Sonal Yadav answered |
The numpy module provides efficient functions and data structures for working with arrays, including 2D arrays.
What is the output of the following code snippet?
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print([row[1] for row in arr])- a)[2, 5, 8]
- b)[1, 2, 3]
- c)[3, 6, 9]
- d)[1, 4, 7]
Correct answer is option 'A'. Can you explain this answer?
What is the output of the following code snippet?
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print([row[1] for row in arr])
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print([row[1] for row in arr])
a)
[2, 5, 8]
b)
[1, 2, 3]
c)
[3, 6, 9]
d)
[1, 4, 7]
|
|
Sonal Yadav answered |
The code snippet uses a list comprehension to extract the second element from each row of the 2D array. The output will be [2, 5, 8].
What will be the output of the following code snippet?
array = [[1, 2], [3, 4]]
print(array[-1][-1])- a)1
- b)2
- c)3
- d)4
Correct answer is option 'D'. Can you explain this answer?
What will be the output of the following code snippet?
array = [[1, 2], [3, 4]]
print(array[-1][-1])
array = [[1, 2], [3, 4]]
print(array[-1][-1])
a)
1
b)
2
c)
3
d)
4
|
|
Sonal Yadav answered |
The code snippet accesses the last element of the last row in the 2D array and prints its value, which is 4.
Chapter doubts & questions for 2D Arrays - Python for EmSAT Achieve 2025 is part of EmSAT Achieve exam preparation. The chapters have been prepared according to the EmSAT Achieve exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for EmSAT Achieve 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
Chapter doubts & questions of 2D Arrays - Python for EmSAT Achieve in English & Hindi are available as part of EmSAT Achieve exam.
Download more important topics, notes, lectures and mock test series for EmSAT Achieve Exam by signing up for free.
Python for EmSAT Achieve
57 videos|39 docs|18 tests
|
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up
within 7 days!
within 7 days!
Takes less than 10 seconds to signup