Numpy Fundamantals

Question 1

How can you find the index of the maximum value in a numpy array arr?

np.argmax(arr).

arr.argmax().

Both A and B.

None of the above.

Question 2

What is numpy?

A numerical computing library for Python.

A web development framework.

A machine learning algorithm.

An operating system.

Question 3

What is the output of np.array([1, 2, 3]) - np.array([4, 5, 6])?

[-3, -3, -3]

[3, 3, 3]

[-3, -3, -3, -3, -3, -3]

Error

Question 4

What is the output of np.floor([-1.7, -1.5, -0.2, 0.2, 1.5, 1.7])?

[-2, -2, -1, 0, 1, 1].

[-1, -1, 0, 0, 1, 1].

[-2, -2, -1, -1, 1, 1].

[-1, -2, 0, 0, 1, 1].

Question 5

What dose the dtype parameter in np.array() function specify?

The data type of the array elements.

The shape of the array.

The dimension of the array.

The size of the array.

Question 6

What is the output of np.logical_and([True, False, True], [True, True, False])?

[True, False, False].

[True, True, True].

[False, False, False].

[False, True, False].

Question 7

What is the output of np.where([True, False, True])?

[0, 1, 2]

[True, False, True]

[[0], [2]]

Error

Question 8

How can you find the index of the first occurrence of a value greater than a specified threshold in a numpy array arr?

np.argmax(arr > threshold).

np.where(arr > threshold)[0][0].

Both A and B.

None of the above.

Question 9

How can you find the index of the maximum value in each row of a 2D numpy array arr?

np.argmax(arr, axis=0).

np.argmax(arr, axis=1).

arr.argmax(axis=0).

arr.argmax(axis=1).

Question 10

What is the output of np.linspace(0, 1, 5, endpoint=False)?

An array of 5 equally spaced values from 0 to 1, excluding 1.

An array of 5 equally spaced values from 0 to 1, including 1.

An array of 5 random values from 0 to 1.

An array of 5 zeros.

Question 11

What does the np.([1, 2, 3] function create?

A diagonal matrix with diagonal elements [1, 2, 3].

A 3x3 array with diagonal elements [1, 2, 3].

A 3x3 identity matrix.

A 3x3 array of ones.

Question 12

What is the output of np.array([1, 2, 3]) + np.array([4, 5])?

[5, 7, 8]

[5, 7, 3]

[1, 2, 3, 4, 5]

Error

Question 13

What does the np. random.rand(3, 3) function create?

A 3x3 array of random values between 0 and 1.

A 3x3 array of zeros.

A 3x3 identity matrix.

A 3x3 array of ones.

Question 14

What is the output of np.sum([ [0, 1], [0, 5] ], axis=0)?

[0, 1]

[0, 6]

[0, 0]

[0, 5]

Question 15

How can you find the inverse of square numpy array arr?

np.inverse(arr).

np.linalg.inv(arr).

arr.inverse().

None of the above.

Question 16

How can you find the index of the maximum value in a specific axis of a numpy array arr?

np.argmax(arr, axis=0).

np.argmax(arr, axis=1).

arr.argmax(axis=0).

arr.argmax(axis=1).

Question 17

What is the primary data structure in numpy?

Array

List

Tuple

Dictionary

Question 18

What is the output of np.arange(10)[:, np.newaxis]?

A 1D array [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

A 2D array [[0], [1], [2], [3], [4], [5], [6], [7], [8], [9]]

A 2D array [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]]

Error

Question 19

What does the axis parameter in numpy functions specify?

The number of dimensions.

The axis along which the function is applied.

The shape of the output array.

The data type of the output array.

Question 20

How can you perform element-wise multiplication of two numpy array a and b?

a * b

np.multiply(a, b).

Both A and B.

None of the above.

Question 21

How can you concatenate two numpy arrays a and b along the rows?

np.concatenate((a, b), axis=0).

np.concatenate((a, b), axis=1).

np.vstack((a, b)).

All of the above.

Question 22

How can you find the index of the last occurrence of a value greater than or equal to a specified threshold in a numpy array arr?

np.argmax(arr >= threshold).

np.where(arr >= threshold)[0][-1].

Both A and B.

None of the above.

Question 23

How can you find the cross product of two numpy a and b?

np.cross(a, b).

a.cross(b).

Both A and B.

None of the above.

Question 24

How can you find the element-wise maximum of two numpy arrays a and b?

np.max(a, b)

np.maximum(a, b).

a.max(b)

None of the above.

Question 25

How can you find the transpose of a numpy array arr?

np.transpose(arr).

arr.transpose().

Both A and B.

None of the above.

Question 26

How can you find the index of the last occurrence of a value less then a specified threshold in a numpy array array arr?

np.argmax(arr < threshold).

np.where(arr < threshold)[0][-1].

Both A and B.

None of the above.

Question 27

What is the output of np. randint(1, 10, (2, 3))?

A 2x3 array of random integers between 1 and 10.

A 2x3 array of random floats between 1 and 10.

A 2x3 array of ones.

A 2x3 identity matrix.

Question 28

How can you find the square root of each element in a numpy array arr?

np.sqrt(arr)

arr.sqrt()

Both A and B.

None of the above.

Question 29

How can you reshape a 1D array arr with 12 with elements into a 2D array with 4 rows and 3 columns?

np.reshape(arr, (4, 3)).

arr.reshape(4, 3).

np.reshape(arr, (-1, 3)).

All of the above.

Question 30

What is the output of np.clip([-2, -1, 0, 1, 2], -1, 1)?

[-1, -1, 0, 1, 1]

[-2, -1, 0, 1, 2]

[-1, -1, 0, 1, 2]

[-2, -1, 0, 1, 1]

Question 31

Which of the following is a correct way to import numpy?

import numpy

import numpy as np.

from numpy import *.

All of the above.

Question 32

How can you find the dot product of two numpy array a and b?

np.dot(a, b)

a.dot(b)

Both A and B.

None of the above.

Question 33

How can you find the index of the minimum value in a numpy array arr?

np.argmin(arr).

arr.argmin().

Both A and B.

None of the above.

Question 34

How can you create a numpy array from a python list?

np.array(my_list).

np.array([my_list]).

np.array({my_list}).

np.array(my_list, dtype=np.array).

Question 35

What does the np. unique() function do?

Finds the unique elements in an array.

Sorts the elements of an array.

Calculates the mean of an array.

None of the above.

Question 36

What is the output of np.full((2, 2), 7)?

A 2x2 array of sevens.

A 2x2 array of ones.

A 2x2 identity matrix.

A 2x2 array of random numbers.

Question 37

What is the output of np.arange (5)?

[0, 1, 2, 3, 4]

[1, 2, 3, 4, 5]

[0, 1, 2, 3, 4, 5]

[5, 4, 3, 2, 1, 0]

Question 38

How can you find the index of the first occurrence of a value in a numpy array arr?

np.argwhere(arr == value)[0].

np.where(arr == value)[0][0].

Both A and B.

None of the above.

Question 39

How can you find the cumulative sum of elements along a specified axis in a numpy array arr?

np.cumsum(arr, axis=0).

np.cumsum(arr, axis=1).

arr.cumsum(axis=0).

arr.cumsum(axis=1).

Question 40

What does the np.zeros((3, 3)) function create?

A 3x3 array of zeros.

A 3x3 array of ones.

A 3x3 identity matrix.

A 3x3 array of random numbers.

Question 41

What is the output of np.intersect1d([1, 2, 3], [2, 3, 4])?

[1, 2, 3]

[2, 3]

[1, 4]

[4]

Question 42

How can you find the index of the last occurrence of a value in a numpy array arr?

np.argwhere(arr == value)[-1].

np.where(arr == value)[0][-1].

Both A and B.

None of the above.

Question 43

How can you calculate the mean of a numpy array arr?

np.mean(arr).

arr.mean().

Both A and B.

None of the above.

Question 44

What does the np.linspace(0, 10, 5) function create?

An array of 5 equally spaced values from 0 to 10.

An array of 5 random values from 0 to 10.

An array of 5 zeros.

An array of 5 ones.

Question 45

How can you find the mean of each row in a 2D numpy array arr?

np.mean(arr, axis=0).

np.mean(arr, axis=1).

arr.mean(axis=0).

arr.mean(axis=1).

Question 46

What is the output of np.arange(3) .reshape(3, 1) + np.arange(3)?

[[0, 1, 2], [1, 2, 3], [2, 3, 4]]

[[0, 1, 2]]

[[0], [1], [2]]

Error

Question 47

What is the output of np.eye(3)?

A 3x3 identity matrix.

A 3x3 array of zeros.

A 3x3 array of ones.

A 3x3 array of random numbers.

Question 48

How can you find the index of the maximum value in a numpy array arr ignoring NaN values?

np.nanargmax(arr).

arr.nanargmax().

Both A and B.

None of the above.

Question 49

What is the output of np.ones((2, 2)) * 2?

A 2x2 array of twos.

A 2x2 array of ones.

A 2x2 identity matrix.

A 2x2 array of random numbers.

Question 50

How can you find the index of the first occurrence of a value greater than 10 in a numpy array arr?

np.argmax(arr > 10).

np.where(arr > 10)[0][0].

Both A and B.

None of the above.

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shobha