Python Modules: math, random and statistics

Sample questions

Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.

Section A · multiple choice

1. 1.

   A module in Python is:

   1. a data type
   2. an error message
   3. a kind of loop
   4. a file of Python definitions that can be imported and used

   Answer

   (d) a file of Python definitions that can be imported and used

2. 2.

   What does this program print? import math print(math.ceil(159 / 8))

   1. 22
   2. 40
   3. 20
   4. 21

   Answer

   (c) 20

   ceil() rounds up to a whole number (an int)

3. 3.

   Which of these can this program NEVER print? import random print(random.randint(20, 24))

   1. 25
   2. 23
   3. 20
   4. 24

   Answer

   (a) 25

   randint(20, 24) gives a whole number from 20 to 24, both included

Section B · short answer

1. 4.

   What is the difference between import math and from math import sqrt?

   Answer

   import math brings in the module, so functions are used as math.sqrt(); from math import sqrt brings in only sqrt, used directly as sqrt().

2. 5.

   What does this program print? Give (a) the first line (b) the second. import math print(math.floor(8.5 - 17)) print(math.pow(2, 3))

   Answer

   (a) −9; (b) 8.0

   8.5 − 17 = −8.5; floor() goes down, to the more negative whole number; pow() always gives a float

Section C · long answer

1. 6.

   Explain three ways of importing a module and using its functions, with examples.

   Answer

   import math → math.sqrt(9); from math import sqrt → sqrt(9); from math import * → sqrt(9) and pi; import math as m → m.sqrt(9).

Fresh sheets for your child

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