Deck 3: Decision Structures and Boolean Logic

Question 1

Multiple Boolean expressions can be combined by using a logical operator to create __________ expressions.

A) sequential
B) logical
C) compound
D) mathematical

Answer 1

C

Question 2

The decision structure that has two possible paths of execution is known as

A) single alternative
B) double alternative
C) dual alternative
D) two alternative

Answer 2

C

Question 3

A Boolean variable can reference one of two values which are

A) yes or no
B) True or False
C) T or F
D) Y or N

Answer 3

B

Question 4

Which logical operators perform short-circuit evaluation?

A) or, not
B) not, and
C) or, and
D) and, or, not

Question 5

Expressions that are tested by the if statement are called Boolean expressions.

Question 6

When using the __________ logical operator,one or both of the subexpressions must be true for the compound expression to be true.

A) or
B) and
C) not
D) maybe

Question 7

The Python language is not sensitive to block structuring of code.

Question 8

What is the result of the following Boolean expression,given that x = 5,y = 3,and z = 8?
X < y or z > x

A) True
B) False
C) 8
D) 5

Question 9

The not operator is a unary operator which must be used in a compound expression.

Question 10

Decision structures are also known as selection structures.

Question 11

The following statement will check to see if the turtle's pen color is 'green':
if turtle.pencolor()= 'green'

Question 12

Which of the following is the correct if clause to determine whether y is in the range 10 through 50,inclusive?

A) if 10 < y or y > 50:
B) if 10 > y and y < 50:
C) if y >= 10 and y <= 50:
D) if y >= 10 or y <= 50:

Question 13

Python uses the same symbols for the assignment operator as for the equality operator.

Question 14

Short -circuit evaluation is only performed with the not operator.

Question 15

Nested decision statements are one way to test more than one condition.

Question 16

A(n)__________ structure is a logical design that controls the order in which a set of statements execute.

A) function
B) control
C) sequence
D) iteration

Question 17

The if statement causes one or more statements to execute only when a Boolean expression is true.

Question 18

An action in a single alternative decision structure is performed only when the condition is true.

Question 19

The following code snippet will change the turtle's pen size to 4 if it is presently less than 4:
if turtle.pensize()< 4:
turtle.pensize(4)

Question 20

Python allows you to compare strings,but it is not case sensitive.

Question 21

In a decision structure,the action is ___________ executed because it is performed only when a specific condition is true.

Question 22

The turtle.isdown()function returns ___________ if the turtle's pen is down.

Question 23

What is the result of the following Boolean expression,given that x = 5,y = 3,and z = 8?
X < y and z > x

A) True
B) False
C) 8
D) 5

Question 24

The ___________ statement is used to create a decision structure.

Question 25

Python provides a special version of a decision structure known as the __________ statement,which makes the logic of the nested decision structure simpler to write.

Question 26

The logical __________ operator reverses the truth of a Boolean expression.

Question 27

Which of the following will hide the turtle if it is visible?

A) if turtle.isvisible():
Turtle.invisible()
B) if turtle.isvisible
Turtle.hideturtle()
C) turtle.isvisible():
Turtle.hide()
D) if turtle.isvisible():
Turtle.hideturtle()

Question 28

A(n)__________ statement will execute one block of statements if its condition is true or another block if its condition is false.

Question 29

Which of the following is the correct if clause to determine whether choice is anything other than 10?

A) if choice != 10:
B) if choice != 10
C) if choice <> 10:
D) if not(choice < 10 and choice > 10):

Question 30

In Python the __________ symbol is used as the equality operator.

A) ==
B) <>
C) <=
D) !=

Question 31

In flowcharting,the __________ symbol is used to represent a Boolean expression.

Question 32

A(n)___________ expression is made up of two or more Boolean expressions.

Question 33

A(n)__________ decision structure provides only one alternative path of execution.

Question 34

In Python the __________ symbol is used as the not-equal-to operator.

A) ==
B) <>
C) <=
D) !=

Question 35

Which of the following will determine if the turtle's pen is up and will change it to down if that is the case?

A) if turtle.isup():
Turtle.isdown()
B) if turtle.isdown
Turtle.penup()
C) if not(turtle.isdown()):
Turtle.pendown()
D) if not(turtle.penup())
Turtle.penup()

Question 36

What is the result of the following Boolean expression,given that x = 5,y = 3,and z= 8?
Not (x < y or z > x)and y < z

A) True
B) False
C) 8
D) 5

Question 37

When using the __________ logical operator,both subexpressions must be true for the compound expression to be true.

A) or
B) and
C) not
D) either or or and

Question 38

Boolean variables are commonly used as __________ to indicate whether a specific condition exists.

Question 39

What does the following expression mean?
X <= y

A) x is less than y
B) x is less than or equal to y
C) x is greater than y
D) x is greater than or equal to y

Question 40

A(n)__________ operator determines whether a specific relationship exists between two values.