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NumPy Basics Set-1

Leave a Comment / O Level Tests / By brcinstitute111@gmail.com

Instruction:-

Number of Questions : 25

Total Marks : 25

Each question carry 1 Marks.

No negative marking

Results

#1. What is NumPy in Python?

A library for data visualization

A library for numerical computations

A web development framework

A database management system

#2. Which function is used to create a NumPy array?

np.create()

np.array()

np.make()

np.new()

#3. What is the output of the following code?
import numpy as np
a = np.array([1, 2, 3, 4])
print(a.shape)

(4,)

(1,4)

(4,1)

4

#4. Which of the following will create a 2×3 array of zeros?

np.zeros((3, 2))

np.zeros([2, 3])

np.zeros((2, 3))

np.zeros(2, 3)

#5. How to find the datatype of elements in a NumPy array a?

a.type

a.dtype

a.data

a.kind

#6. What does np.arange(5) generate?

[0, 1, 2, 3, 4]

[1, 2, 3, 4, 5]

[5]

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

#7. Which function is used to generate evenly spaced numbers over a specified interval?

np.linspace()

np.arange()

np.random()

np.space()

#8. How do you reshape a NumPy array a of size 6 into a 2×3 array?

a.reshape(2, 3)

a.resize(2, 3)

p.reshape(a, (2, 3))

Both A and C

#9. Which of the following is NOT a valid NumPy data type?

int32

float64

str100

bool

#10. What does the np.sum() function do?

Returns the sum of all elements in the array

Returns the product of all elements

Returns the average of elements

Returns the maximum value

#11. How do you select the first element of a NumPy array a?

a[0]

a[1]

a[-1]

a.first()

#12. Which of the following methods returns the transpose of a NumPy array?

a.T

a.transpose()

Both A and B

a.swap()

#13. What will be the output of this code?
import numpy as np
a = np.array([[1, 2], [3, 4]])
print(a[1, 0])

1

2

3

4

#14. Which function generates random numbers in NumPy?

np.rand()

np.random()

np.random.rand()

np.rnd()

#15. How can you find the maximum value in a NumPy array a?

a.max()

np.max(a)

Both A and B

a.maximum()

#16. If a = np.array([1, 2, 3]) and b = np.array([4, 5, 6]), what does a + b return?

[1, 2, 3, 4, 5, 6]

[5, 7, 9]

[4, 7, 9]

Error

#17. What is the shape of the array created by np.ones((3, 4))?

(4, 3)

(3, 4)

(12,)

(1, 3, 4)

#18. What will np.sqrt(np.array([4, 9, 16])) return?

[2. 3. 4.]

[16, 81, 256]

[2, 3, 4]

Error

#19. Which method can be used to flatten a NumPy array?

a.flatten()

a.ravel()

Both A and B

a.flat()

#20. What does np.dot(a, b) do where a and b are arrays?

Element-wise multiplication

Dot product of two arrays

Cross product

Adds two arrays

#21. Which library must be imported to use NumPy functions?

import numpy

import np

import numpy as np

from numpy import *

#22. What will np.array([1, 2, 3, 4]).dtype return?

The shape of the array

Data type of elements (int32, int64, etc.)

Number of elements

Error

#23. What will np.zeros(5) produce?

An array with 5 zeros

A 5x5 matrix of zeros

A list with 5 zeros

Error

#24. What does this code do?
a = np.arange(1, 6)
print(a)

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

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

Prints [1, 2, 3, 4]

Prints [5]

#25. Which of these is NOT a method to create an array?

np.array([1, 2, 3])

np.arange(1, 4)

np.ones((3,))

np.create([1, 2, 3])

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Results

#1. What is NumPy in Python?

#2. Which function is used to create a NumPy array?

#3. What is the output of the following code?import numpy as np a = np.array([1, 2, 3, 4]) print(a.shape)

#4. Which of the following will create a 2×3 array of zeros?

#5. How to find the datatype of elements in a NumPy array a?

#6. What does np.arange(5) generate?

#7. Which function is used to generate evenly spaced numbers over a specified interval?

#8. How do you reshape a NumPy array a of size 6 into a 2×3 array?

#9. Which of the following is NOT a valid NumPy data type?

#10. What does the np.sum() function do?

#11. How do you select the first element of a NumPy array a?

#12. Which of the following methods returns the transpose of a NumPy array?

#13. What will be the output of this code?import numpy as np a = np.array([[1, 2], [3, 4]]) print(a[1, 0])

#14. Which function generates random numbers in NumPy?

#15. How can you find the maximum value in a NumPy array a?

#16. If a = np.array([1, 2, 3]) and b = np.array([4, 5, 6]), what does a + b return?

#17. What is the shape of the array created by np.ones((3, 4))?

#18. What will np.sqrt(np.array([4, 9, 16])) return?

#19. Which method can be used to flatten a NumPy array?

#20. What does np.dot(a, b) do where a and b are arrays?

#21. Which library must be imported to use NumPy functions?

#22. What will np.array([1, 2, 3, 4]).dtype return?

#23. What will np.zeros(5) produce?

#24. What does this code do?a = np.arange(1, 6) print(a)

#25. Which of these is NOT a method to create an array?

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#3. What is the output of the following code?
import numpy as np
a = np.array([1, 2, 3, 4])
print(a.shape)

#13. What will be the output of this code?
import numpy as np
a = np.array([[1, 2], [3, 4]])
print(a[1, 0])

#24. What does this code do?
a = np.arange(1, 6)
print(a)