Quiz on NumPy

1. Question

Which of the following is not true about NumPy?

It is a cross-platform module
It stands for Number Python
We need to install this module before using it
None of the above

2. Question

Which of the function is a function to create a numpy array?

empty()
array()
ones()
All the above

3. Question

What is the output of the below code?

np.arange(2,8)

array([2, 3, 4, 5, 6, 7])
array([3, 4, 5, 6, 7])
array([2, 3, 4, 5, 6, 7, 8])
array([3, 4, 5, 6, 7, 8])

4. Question

Find the output of the below code.

a = np.array([[[1,2,3],[4,5,6]]])

print(a.ndim)

1
(1,3)
3
(3,1)

5. Question

What does the function itemsize() return?

It returns the size of the array
It returns the number of elements in the array
It returns the byte size of each element of the array
None of the above

6. Question

Find the output of the below code.

a = np.array([[1,2,3],[4,5,6]])

a[1,2]

6
5
2
TypeError

7. Question

What is the output of the below code?

np.linspace(1,5,5)

array([1. , 2.33333333, 3.66666667, 5. ])
array([1., 2., 3., 4., 5.])
array([1. , 1.8, 2.6, 3.4, 4.2, 5. ])
None of the above

8. Question

Which of the following is code gives an error?

a = np.array([(1,2,3),(4,5,6)]) a[(0,1)]
a = np.array([(1,2,3),(4,5,6)]) a.reshape(2,4)
a = np.array([(1,2,3),(4,5,6)]) a[np.arange(1), :]
All the above

9. Question

What is the output of the below code?

print(np.zeros(5).dtype)

int8
int16
uint8
float64

10. Question

Which of the following is not true about the identity matrix?

It is a square matrix
It contains 1s in all the diagonals
We can create an identity matrix using the identity() function
None of the above

11. Question

What is the output of the below code?

np.array([[1,2,3],[4,5,6]]).ravel()

array([1, 2, 3, 4, 5, 6])
array([4, 5, 6, 1, 2, 3])
array((1, 2, 3, 4, 5, 6))
SytaxError

12. Question

Which of the following will give the output as

array([[1, 2, 3, 1, 2, 3],

[4, 5, 6, 4, 5, 6]])

arr = np.array([[1,2,3],[4,5,6]]) np.vstack((arr,arr))
arr = np.array([[1,2,3],[4,5,6]]) np.hstack((arr,arr))
arr = np.array([[1,2,3],[4,5,6]]) arr.hstack(arr)
arr = np.array([[1,2,3],[4,5,6]]) arr.vstack(arr)

13. Question

Which of the following functions is used to create an array containing constant value?

constant()
same()
full()
All the above

14. Question

Which of the following codes give an error?

a1 = np.array([1,2,3]) a2=np.array([0,4,9]) a1.dot(a2)
a1 = np.array([1,2,3,3]) a2=np.array([0,4,9]) np.add(a1,a2)
a = np.array([[1,3,5],[4,6,8]]) np.sum (a)
All the above

15. Question

Which of the following is the correct way to transpose of matrix A?

Trans(A)
Transpose(A)
A.T
A.Transpose