Deck 2: Software Development Data Types and Expressions

Question 1

In general, a variable name must begin with either a letter or an underscore (_).

Answer 1

True

Question 2

In the maintenance phase of the waterfall model, the parts of a program are brought together into a smoothly functioning whole, usually not an easy task.

Answer 2

False

Question 3

The design phase of the waterfall model is also called the coding phase.

Answer 3

False

Question 4

string is an example of a data type in Python.

Question 5

The + operator allows you to build a string by repeating another string a given number of times.

Question 6

When the Python interpreter evaluates a literal, the value it returns is simply that literal.

Question 7

In Python, \b is a escape sequence that represents a horizontal tab.

Question 8

Computer scientists refer to the process of planning and organizing a program as software development.

Question 9

Expressions provide an easy way to perform operations on data values to produce other data values.

Question 10

1,500 is a valid integer literal in Python.

Question 11

In Python, a floating-point number must be written using scientific notation.

Question 12

Text processing is by far the least common application of computing.

Question 13

A variable associates a name with a value, making it easy to remember and use the value later in a program.

Question 14

Programs rarely work as hoped the first time they are run.

Question 15

Modern software development is usually incremental and iterative.

Question 16

Python is a loosely typed programming language.

Question 17

Variables receive their initial values and can be reset to new values with an assignment statement.

Question 18

Testing is a deliberate process that requires some planning and discipline on the programmer's part.

Question 19

The cost of developing software is spread equally over the phases.

Question 20

Real numbers have infinite precision, which means that the digits in the fractional part can continue forever.

Question 21

Which of the following is NOT a valid name that can be used for a variable?

A) total
B) 1ending
C) propertyValue
D) TEST

Question 22

Exponentiation and assignment operations are left associative.

Question 23

What effect does the following print statement have? print("Hello" * 5)

A) The string "Hello" is converted into an int type of value 1 and then multiplied by 5, producing "5".
B) The string is indexed and the character count is multiplied with the total number of characters in the string, producing "25".
C) The print statement produces a type error as you cannot multiply a string type with an integer type.
D) The print statement will produce "HelloHelloHelloHelloHello".

Question 24

Which of the following functions and expressions will convert the ASCII character "Z" to its numeric equivalent ASCII code?

A) ord('Z')
B) chr('Z')
C) ord(chr('Z'))
D) chr(ord('Z'))

Question 25

A semantic error is detected when the action that an expression describes cannot be carried out, even though that expression is syntactically correct.

Question 26

What statement accurately reflects the difference between the quotient operator and the division operator?

A) The two operators are effectively the same, unless being carried out on strings.
B) The quotient operator produces a float, while the division operator produces an integer.
C) The quotient operator produces a float, while the division operator produces an integer + remainder.
D) The quotient operator produces an integer, while the division operator produces a float.

Question 27

What are the two different means by which a floating-point number can be written? (Choose two.)

A) decimal notation
B) line notation
C) scientific notation
D) octal notation

Question 28

In Python, what data type is used to represent real numbers between -10^308 and 10^308 with 16 digits of precision?

A) int
B) float
C) string
D) array

Question 29

When attempting to produce a correct program, what is the point of developing a test suite?

A) To provide a small set of inputs as a test to verify that a program will be correct for all inputs.
B) To modify the running program's variables and verify that the program will still function, even if the code changes.
C) To test the outputs of a program against known values to verify that the math coprocessor is performing properly.
D) To test the code syntax for possible errors such as undefined variables.

Question 30

What special character does the '\b' escape sequence generate?

A) It generates a border special character.
B) It generates a bold special character, causing all text after the character to be bolded.
C) It denotes a block of text follows the escape sequence.
D) It produces a backspace special character, which performs the same function as the backspace key.

Question 31

In the waterfall development model, what is the most expensive part of software development?

A) The design phase.
B) The integration phase.
C) The maintenance phase.
D) The analysis phase.

Question 32

In Python, % is the exponentiation operator.

Question 33

The modulus operator has the highest precedence and is evaluated first.

Question 34

What statement accurately describes what a semantic error is?

A) A semantic error is the result of an expression that is syntactically incorrect.
B) A semantic error occurs when an expression is syntactically correct, but the expression cannot be carried out.
C) A semantic error happens when an expression attempts to perform operations between incompatible data types.
D) A semantic error is the result of an improperly nested if statement.

Question 35

What function can you call inside of IDLE to show the resources of the math module, once it has been imported?

A) show(math)
B) list(math)
C) dir(math)
D) resource(math)

Question 36

Which of the following literals would be considered a float type in Python?

A) -1
B) 3.14
C) '88'
D) 5

Question 37

You can use parentheses to change the order of evaluation in an arithmetic expression.

Question 38

What print statement will output a single '\' character?

A) print('\')
B) print('\\')
C) print('"\"')
D) print('\\\')

Question 39

What must be done in order to concatenate a string and a float object?

A) Nothing can be done, as the two data types cannot be converted to a compatible type.
B) The string object must be converted to a float object via the float() function.
C) The float object must be converted to an integer object via the int() function.
D) The float object must be converted to a string object via the str() function.

Question 40

What is the largest value of an int data type in the Python programming language?

A) 2,147,483,647
B) 4,294,967,294
C) 2,147,483,647^100
D) The value is limited only by the memory of the host computer.

Question 41

What term describes the process of substituting a simple process for a complex process in a program to make the program easier to understand and maintain?

A) refactoring
B) abstraction
C) inferring
D) subletting

Question 42

You are working on a Python script that relies heavily on the cos and sin functions of the math module. As these are the only functions you require, what should you do to import only these functions, rather than the whole math module?

A) import cos, sin
B) import cos, sin from math
C) import math.cos, math.sin
D) from math import cos, sin

Question 43

What will be the return value of running the following function? chr(ord('T') + 5)?

A) 78
B) \t
C) 0x89
D) "Y"

Question 44

Functions that are always available in Python come from what module?

A) main
B) internal
C) __builtin__
D) __system__

Question 45

How does the int function convert a float to an int?

A) By rounding to the nearest whole number.
B) By removing the fractional value of the number.
C) By rounding up to the closest whole number.
D) By rounding down to the closest whole number.

Question 46

In Python, what does the "%" operator do in the expression 6 % 4?

A) It performs an exponentiation to the 4th power.
B) It returns a remainder or modulus.
C) It returns a float as a result of division.
D) It returns the percentage of the operation.

Question 47

In evaluating the precedence rules used by Python, what statement is accurate?

A) Exponentiation has the highest precedence.
B) Multiplication is evaluated before unary multiplication.
C) Addition and subtraction are evaluated after assignment.
D) Exponentiation and assignment operations are left associative.

Question 48

You are reviewing the code written by another programmer, and encounter a variable whose name is entirely in capital letters. What might you discern from this variable name?

A) The variable is a symbolic constant.
B) The variable is a reference variable.
C) The variable is part of a program loop.
D) The variable is used to store a dynamic value that is constantly changing.

Question 49

What is the total number of distinct values in the ASCII set?

A) 64
B) 128
C) 256
D) 512

Question 50

What statement accurately describes the analysis phase of the waterfall model?

A) In this phase, the programmers determine what the program will do.
B) In this phase, the programmers determine how the program will do its task.
C) In this phase, the programmers receive a broad statement of a problem that may be solved by the development of a program.
D) In this phase, the programmers bring together the various parts of a program into a smoothly functioning whole.