Question 1

When using the _____ operator, both subexpressions must be true for the compound expression to be true.
A) or
B) and
C) not
D) maybe

Accepted Answer

The "and" operator requires both subexpressions to be true for the entire expression to be true.

Question 2

In Python the _____ symbol is used as the equality operator.
A) ==
B) =
C) >=
D) <=

Accepted Answer

In Python, the double equals symbol (==) is used to compare if two values are equal. The single equals symbol (=) is used for variable assignment, not for comparison. The symbols >= and <= are used for greater-than-or-equal-to and less-than-or-equal-to comparisons, respectively.

Question 3

What is the result of the following Boolean expression, if x equals 5, y equals 3, and z equals 8?
X < y or z > x
A) true
B) false
C) 8
D) 5

Accepted Answer

When we substitute the given values, we get:
5 < 3 or 8 > 5 
This simplifies to:
False or True 
Since there is an 'or' operator between the two conditions, we only need one of them to be true for the entire expression to be true. Thus, the result is 'True'.

Question 4

A Boolean variable can reference one of two values: _____.
A) yes or no
B) true or false
C) T or F
D) Y or N

Accepted Answer

Boolean variables are used to represent two possible values: true or false. A is incorrect because "yes" and "no" are not standard Boolean values. C and D are also not commonly used Boolean values.

Question 5

In Python, the _____ symbol is used as the not-equal-to operator.
A) ==
B) <>
C) <=
D) !=

Accepted Answer

In Python, the not-equal-to operator is represented by the symbol '!='. The other symbols listed have different meanings: '==' checks for equality, '<=' checks for less than or equal to, and '<>' was used in older versions of Python but has been deprecated in favor of '!='.

Question 6

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

Accepted Answer

The if statement checks if a Boolean expression is true and only executes the statements inside the if block if it is true. Otherwise, it skips over the if block and continues executing the following statements.

Question 7

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

Accepted Answer

To determine whether y is in the range 10 through 50, we need to check if it is greater than 10 and less than 50. So option C is the correct choice. Option A checks if y is less than 10 or greater than 50 which is incorrect. Option B checks if y is less than 10 and less than 50 which is also incorrect. Option D checks if y is less than 50 or greater than 10 which is equivalent to option A and hence incorrect.

Question 8

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

Accepted Answer

Python string comparison is case sensitive, meaning "Hello" and "hello" would not be considered equal.

Question 9

What is the result of the following Boolean expression, if x equals 5, y equals 3, and z equals 8?
X < y and z > x
A) true
B) false
C) 8
D) 5

Accepted Answer

The expression evaluates to false because x < y (5 < 3) is false, and for the 'and' operator to be true, both conditions must be true.

Question 10

When using the _____ operator, one or both subexpressions must be true for the compound expression to be true.
A) Or
B) And
C) Not
D) Maybe

Accepted Answer

The Or operator requires either one or both subexpressions to be true in order for the compound expression to be true.

Question 11

What is the result of the following Boolean expression, if x equals 5, y equals 3, and z equals 8?
Not (x < y or z > x) and y < z
A) true
B) false
C) 8
D) 5

Accepted Answer

The answer of What is the result of the following...

Question 12

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

Accepted Answer

Python uses '=' for assignment and '==' for equality comparison.

Question 13

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

Accepted Answer

The symbol "<=" means "less than or equal to", so the expression "X <= y" means that "X" is either less than or equal to "y".

Question 14

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

Accepted Answer

The term "control structure" refers to any type of statement or statement grouping that may affect the flow of program execution, such as loops, conditionals, and function calls. Control structures are used to specify the order in which statements are executed in a program. Therefore, the most appropriate answer is B, as a control structure is specifically designed to control the flow of execution.

Question 15

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

Accepted Answer

The answer of The decision structure that has two possible...

Question 16

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

Accepted Answer

The Python language uses indentation to denote blocks of code, and therefore is sensitive to block structuring.

Question 17

Which logical operators perform short-circuit evaluation?
A) or, not
B) not, and
C) or, and
D) and, or, not

Accepted Answer

The logical operators "or" and "and" perform short-circuit evaluation, while "not" does not. This means that if the outcome of an "or" statement is already determined by the first expression (e.g. true or false), the second expression will not be evaluated. Similarly, if the outcome of an "and" statement is already determined by the first expression (e.g. false and true), the second expression will not be evaluated. Short-circuit evaluation can improve efficiency and prevent errors in certain situations.

Question 18

Multiple Boolean expressions can be combined by using a logical operator to create _____ expressions.
A) sequential
B) logical
C) compound
D) mathematical

Accepted Answer

When multiple Boolean expressions are combined with logical operators (such as "and" or "or"), the resulting expression is called a compound expression.

Question 19

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

Accepted Answer

Nested decision structures allow for testing of multiple conditions within each other, making it possible to create more complex decision-making processes.

Question 20

Which of the following is the correct if clause to use to determine whether choice is other than 10? A) if choice != 10: B) if choice != 10 C) if choice <> 10: D) if choice <> 10

Accepted Answer

Option A is the correct syntax for checking if the variable "choice" is not equal to 10. Option B would also work, but it is missing a colon at the end. Option C and D use the deprecated not-equal-to operator "<>", which is no longer recommended in Python 3.x.

Quiz 3: Decision Structures and Boolean Logic

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

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

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

A Boolean variable can reference one of two values: _____.

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

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

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

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

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

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

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

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

What does the following expression mean? X <= y

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

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

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

Which logical operators perform short-circuit evaluation?

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

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

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