NumPy Online Quiz, NumPy MCQ Quiz, W3Schools, Great Learning

1 .

NumPY stands for?

A)

Numerical Python

B)

Number In Python

C)

Numbering Python

D)

None Of the above

Correct Answer : Option (A) : Numerical Python

Explanation : NumPy, which stands for Numerical Python, is a library consisting of multidimensional array objects

2 .

Numpy developed by?

A)

Jim Hugunin

B)

Wes McKinney

C)

Travis Oliphant

D)

Guido van Rossum

Correct Answer : Option (C) : Travis Oliphant

3 .

Which of the following Numpy operation are correct?

A)

Operations related to linear algebra.

B)

Mathematical and logical operations on arrays.

C)

Fourier transforms and routines for shape manipulation.

D)

All of the above

Correct Answer : Option (D) : All of the above

4 .

NumPy is often used along with packages like?

A)

Node.js

B)

SciPy

C)

Matplotlib

D)

Both B and C

Correct Answer : Option (D) : Both B and C

Explanation : NumPy is often used along with packages like SciPy (Scientific Python) and Matplotlib (plotting library)

5 .

Which of the following is contained in NumPy library?

A)

fourier transform

B)

n-dimensional array object

C)

tools for integrating C/C++ and Fortran code

D)

All of the mentioned

Correct Answer : Option (D) : All of the mentioned

Explanation : NumPy is the fundamental package for scientific computing with Python.

6 .

Which of the following function can be used to combine different vectors so as to obtain the result for each n-uplet?

A)

iid_

B)

ix_

C)

ixd_

D)

None of the above

Correct Answer : Option (B) : ix_

Explanation : Length of the 1D boolean array must coincide with the length of the dimension (or axis) you want to slice.

7 .

Which of the following sets the size of the buffer used in ufuncs?

A)

setsize(size)

B)

bufsize(size)

C)

setbufsize(size)

D)

All of the mentioned

Correct Answer : Option (C) : setbufsize(size)

Explanation : Adjusting the size of the buffer may therefore alter the speed at which ufunc calculations of various sorts are completed.

8 .

Which of the following attribute should be used while checking for type combination input and output?

A)

.types

B)

.class

C)

.type

D)

None of the above

Correct Answer : Option (A) : .types

Explanation : Universal functions in NumPy are flexible enough to have mixed type signatures.

9 .

Which of the following function stacks 1D arrays as columns into a 2D array?

A)

column_stack

B)

com_stack

C)

row_stack

D)

All of the above

Correct Answer : Option (A) : column_stack

Explanation : column_stack is equivalent to vstack only for 1D arrays.

10 .

The ________ function returns its argument with a modified shape, whereas the ________ method modifies the array itself.

A)

resize, reshape

B)

reshape, resize

C)

reshape2, resize

D)

None of the above

Correct Answer : Option (B) : reshape, resize

Explanation : If a dimension is given as -1 in a reshaping operation, the other dimensions are automatically calculated.

11 .

The most important object defined in NumPy is an N-dimensional array type called?

A)

narray

B)

darray

C)

nd_array

D)

ndarray

Correct Answer : Option (D) : ndarray

Explanation : The most important object defined in NumPy is an N-dimensional array type called ndarray.

12 .

The basic ndarray is created using?

A)

numpy.array(object, dtype = None, copy = True, order = None, ndmin = 0)

B)

numpy.array(object, dtype = None, copy = True, subok = False, ndmin = 0)

C)

numpy.array(object, dtype = None, copy = True, order = None, subok = False, ndmin = 0)

D)

numpy_array(object, dtype = None, copy = True, order = None, subok = False, ndmin = 0)

Correct Answer : Option (C) : numpy.array(object, dtype = None, copy = True, order = None, subok = False, ndmin = 0)

Explanation : It creates an ndarray from any object exposing array interface, or from any method that returns an array : numpy.array(object, dtype = None, copy = True, order = None, subok = False, ndmin = 0).

13 .

Each built-in data type has a character code that uniquely identifies it.What is meaning of code "M"?

A)

objects

B)

Unicode

C)

datetime

D)

timedelta

Correct Answer : Option (C) : datetime

14 .

What is the range of uint32 data type?

A)

(0 to 4294967295)

B)

(0 to 65535)

C)

(-32768 to 32767)

D)

(-2147483648 to 2147483647)

Correct Answer : Option (A) : (0 to 4294967295)

Explanation : uint32 : Unsigned integer (0 to 4294967295)

15 .

What will be output for the following code?

import numpy as np 
dt = np.dtype([('age',np.int8)]) 
a = np.array([(10,),(20,),(30,)], dtype = dt) 
print a['age']

A)

[10]

B)

[10 20 30]

C)

[[10 20 30]]

D)

Error

Correct Answer : Option (B) : [10 20 30]

16 .

What will be output for the following code?

import numpy as np 
dt = dt = np.dtype('i4') 
print dt

A)

int16

B)

int32

C)

int64

D)

int128

Correct Answer : Option (B) : int32

17 .

What will be output for the following code?

import numpy as np 
a = np.array([1,2,3]) 
print a

A)

[1]

B)

[[1, 2, 3]]

C)

[1, 2, 3]

D)

Error

Correct Answer : Option (C) :

18 .

What will be output for the following code?

import numpy as np 
a = np.array([1, 2, 3,4,5], ndmin = 2) 
print a

A)

[1, 2]

B)

[1, 5]

C)

[1, 2, 3, 4, 5]

D)

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

Correct Answer : Option (D) : [[1, 2, 3, 4, 5]]

19 .

To create sequences of numbers, NumPy provides a function __________ analogous to range that returns arrays instead of lists.

A)

arange

B)

aline

C)

aspace

D)

All of the Above

Correct Answer : Option (A) : arange

Explanation :

When arange is used with floating point arguments, it is generally not possible to predict the number of elements obtained.

20 .

Point out the wrong statement.

A)

matplotlib will enable you to plot graphics

B)

ipython is an enhanced interactive Python shell

C)

Both (a) and (b)

D)

rPy provides a lot of scientific routines that work on top of NumPy

Correct Answer : Option (D) : rPy provides a lot of scientific routines that work on top of NumPy

Explanation : SciPy provides a lot of scientific routines that work on top of NumPy.

21 .

Which of the following returns an array of ones with the same shape and type as a given array?

A)

one_alike

B)

ones_like

C)

all_like

D)

None of the above

Correct Answer : Option (B) : ones_like

Explanation : The optional output arguments of the function can be used to help you save memory for large calculations.

22 .

Point out the correct statement in NumPy.

A)

Numpy array class is called ndarray

B)

In Numpy, dimensions are called axes

C)

NumPy main object is the homogeneous multidimensional array

D)

All of the mentioned

Correct Answer : Option (D) : All of the mentioned

23 .

Which of the following method creates a new array object that looks at the same data?

A)

copy

B)

paste

C)

view

D)

All of the above

Correct Answer : Option (C) : view

24 .

Which of the following function take only single value as input?

A)

fmin

B)

minimum

C)

iscomplex

D)

None of the above

Correct Answer : Option (C) : iscomplex

Explanation : iscomplex function returns a bool array, where true if input element is complex.

25 .

Which of the following set the floating-point error callback function or log object?

A)

settercall

B)

setter

C)

setterstack

D)

All of the above

Correct Answer : Option (A) : settercall

26 .

______ decompose the elements of x into mantissa and twos exponent.

A)

fmod

B)

frexp

C)

trunc

D)

ldexp

Correct Answer : Option (B) : frexp

27 .

What will be output for the following code?

import numpy as np 
a = np.array([1, 2, 3], dtype = complex) 
print a

A)

[ 1.+0.j]

B)

[[ 1.+0.j, 3.+0.j]]

C)

[[ 1.+0.j, 2.+0.j, 3.+0.j]]

D)

[ 1.+0.j, 2.+0.j, 3.+0.j]

Correct Answer : Option (D) : [ 1.+0.j, 2.+0.j, 3.+0.j]

28 .

If a dimension is given as ____ in a reshaping operation, the other dimensions are automatically calculated.

A)

One

B)

Zero

C)

Infinite

D)

Negative one

Correct Answer : Option (D) : Negative one

Explanation : If a dimension is given as -1 in a reshaping operation, the other dimensions are automatically calculated.

29 .

What is the syntax for dtype object in NumPy?

A)

numpy_dtype(object, align, copy)

B)

numpy.dtype(object, align, copy, ndmin)

C)

numpy.dtype(object, align, copy)

D)

numpy.dtype(object, align, copy, subok)

Correct Answer : Option (C) : numpy.dtype(object, align, copy)

Explanation : A dtype object is constructed using the following syntax : numpy.dtype(object, align, copy)

30 .

Which of the following statement is true in NumPy?

A)

The array object returned by __array_prepare__ is passed to the ufunc for computation.

B)

Many of the built-in functions are implemented in compiled C code

C)

Some ufuncs can take output arguments.

D)

Broadcasting is used throughout NumPy to decide how to handle disparately shaped arrays

Correct Answer : Option (A) : The array object returned by __array_prepare__ is passed to the ufunc for computation.

Explanation : The array object returned by __array_prepare__ is passed to the ufunc for computation is true

31 .

What will be printed?

 import numpy as np
 a = np.array([1,2,3,5,8])
 b = np.array([0,3,4,2,1])
 c = a + b
 c = c*a
 print (c[2])

A)

25

B)

21

C)

12

D)

9

Correct Answer : Option (B) : 21

32 .

What will be output for the following code?

 import numpy as np
 ary = np.array([1,2,3,5,8])
 ary = ary + 1
 print (ary[1])

A)

B)

1

C)

2

D)

3

Correct Answer : Option (D) : 3

33 .

What is the correct code to install numpy in the linux system containing python3?

A)

pip3 install numpy

B)

pip install numpy

C)

pip numpy install python3

D)

python3 pip3 numpy install

Correct Answer : Option (A) : pip3 install numpy

34 .

full() function requires 2 arguments minimum to pass in it.

A)

true

B)

false

C)

full() doesn't belong to numpy

D)

None of the above

Correct Answer : Option (A) : true

35 .

How to import numpy module?

A)

import numpy

B)

from numpy import *

C)

import numpy as np

D)

All of the above

Correct Answer : Option (D) : All of the above

36 .

Choose the correct statement to load numpy file in python.

A)

np.load()

B)

np.load(filename.npy)

C)

np.save(filename.npy, array)

D)

All of the above

Correct Answer : Option (B) : np.load(filename.npy)

37 .

What does size() do in numpy?

A)

code is wrong

B)

finds shape of array

C)

counts the number of elements

D)

estimates the array of maximum numbers

Correct Answer : Option (C) : counts the number of elements

38 .

reshape() function in numpy array using python is :

A)

reshape(shape)

B)

array.reshape(shape)

C)

reshape(array, shape)

D)

numpy.reshape(array)

Correct Answer : Option (C) : reshape(array, shape)

39 .

What will be output for the following code?

 import numpy as np
 a = np.array([[1,2,3],[0,1,4]]) 
 b = np.zeros((2,3), dtype=np.int16)
 c = np.ones((2,3), dtype=np.int16)
 d = a + b + c
 print (d[1,2] )

A)

5

B)

6

C)

7

D)

8

Correct Answer : Option (A) : 5

40 .

What does it do array.min() ?

A)

finds the maximum number in numpy array

B)

makes operation of minus if x < 100

C)

Both (a) and (b)

D)

finds the minimum number in numpy array

Correct Answer : Option (D) : finds the minimum number in numpy array