Chapter 2 Multiple choice questions

Question 1

A ______ error does not prevent the program from running, but causes it to produce incorrect results.

a) syntax
b) hardware
c) logic
d) fatal

Answer 1

A logic error – code written with correct syntax but needs debugging because it does not do what was intended.

Question 2

A ______ is a single function that the program must perform in order to satisfy the customer.

a) task
b) software requirement
c) prerequisite
d) predicate

Answer 2

A software requirement is a single function that the program must perform in order to satisfy the customer.

Question 3

A(n) ______ is a set of well-defined logical steps that must be taken to perform a task.

a) logarithm
b) plan of action
c) logic schedule
d) algorithm

Answer 3

An algorithm

Question 4

An informal language that has no syntax rules and is not meant to be compiled or executed is called ______.

a) faux code
b) pseudocode
c) Python
d) a flowchart

Answer 4

Pseudocode is an informal language that has no syntax rules.

Question 5

A ______ is a diagram that graphically depicts the steps that take place in a program.

a) flowchart
b) step chart
c) code graph
d) program graph

Answer 5

A flowchart graphically depicts the steps that happen in a program.

Question 6

A ______ is a sequence of characters.

a) char sequence
b) character collection
c) string
d) text block

Answer 6

A sequence of characters is called a string.

Question 7

A ______ is a name that references a value in the computer’s memory.

a) variable
b) register
c) RAM slot
d) byte

Answer 7

A variable is a name that references a value

Question 8

A ______ is any hypothetical person using a program and providing input for it.

a) designer
b) user
c) guinea pig
d) test subject

Answer 8

A user

Question 9

A string literal in Python must be enclosed in ______.

a) parentheses
b) single-quotes
c) double-quotes
d) either single-quotes or double-quotes

Answer 9

A string literal must be enclosed in either single-quotes or double-quotes.

Question 10

Short notes placed in different parts of a program explaining how those parts of the program work are called

a) comments
b) reference manuals
c) tutorials
d) external documentation

Answer 10

Comments.

Question 11

A(n) ______ makes a variable reference a value in the computer’s memory.

a) variable declaration
b) assignment statement
c) math expression
d) string literal

Answer 11

A variable declaration.

Question 12

This symbol marks the beginning of a comment in Python.

a) &
b) *
c) **
d) #

Answer 12

marks the beginning of a comment in Python.

Question 13

Which of the following statements will cause an error?

a) x = 17
b) 17 = x
c) x = 9999
d) x = ‘17’

Answer 13

17 = x

A variable must be declared on the left, and variable names cannot begin with numbers.

Question 14

In the expression 12 + 7, the values on the right and left of the + symbol are called ______.

a) operands
b) operators
c) arguments
d) math expressions

Answer 14

-The values on the left and right of the operator (+) are called operands.

(The full equation, 12 + 7, is called a math expression.)

Question 15

This operator performs integer division.

a) //
b) &
c) **
d) /

Answer 15

/

Question 16

This is an operator that raises a number to a power.

a) %
b) *
c) **
d) /

Answer 16

**

Question 17

This operator performs division, but instead of returning the quotient it returns the remainder.

a) %
b) *
c) **
d) /

Answer 17

%

Question 18

Suppose the following statement is in a program:
price = 99.0

After this statement executes, the price variable will reference a value of which data type?

a) int
b) float
c) currency
d) str

Answer 18

A float (it contains decimals).

Question 19

Which built-in function can be used to read input that has been typed on the keyboard?

a) input()
b) get_input()
c) read_input()
d) keyboard()

Answer 19

input()

Question 20

Which built-in function can be used to convert an int value to a float?

a) int_to_float()
b) float()
c) convert()
d) int()

Answer 20

float()

Question 21

A magic number is ______.

a) a number that is mathematically undefined
b) an unexplained value that appears in a program’s code
c) a number that cannot be divided by 1
d) a number that causes computers to crash

Answer 21

A magic number is an unexplained value that appears in a program’s code.

Question 22

A ______ is a name that represents a value that does not change during the program’s execution.

a) named literal
b) named constant
c) variable signature
d) key term

Answer 22

A named constant represents a value that does not change during the program’s execution.

Question 23

True or false:

Programmers must be careful not to make syntax errors when writing pseudocode programs.

Answer 23

False. Pseudocode is never actually run, it is meant to help think through how to code.

Question 24

True or false:

In a math expression, multiplication and division take place before addition and subtraction.

Answer 24

True, multiplication and division take place before addition and subtraction.

Question 25

True or false:

Variable names can have spaces in them.

Answer 25

False, variable names can only contain A-Z, a-z, 0-9 and _

Question 26

True or false:

In Python, the first character of a variable name cannot be a number.

Answer 26

True, the first character of a variable name cannot be a number in Python.

Question 27

If you print a variable that has not been assigned a value, the number 0 will be displayed.

Answer 27

False, it does not contain 0 and is considered NULL.