Question 1

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

Accepted Answer

According to Python naming conventions, a variable name must begin with either a letter or an underscore. It cannot have any other special character or numeric digit at the beginning.

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.

Accepted Answer

In the waterfall model, the maintenance phase involves correcting errors, adapting the software to new environments, or making enhancements. The integration of parts into a whole occurs in the development or coding phase.

Question 3

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

Accepted Answer

The design phase of the waterfall model is focused on planning and creating documentation that will guide the coding phase, but it is not the coding phase itself.

Question 4

string is an example of a data type in Python.

Accepted Answer

The answer of string is an example of a data...

Question 5

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

Accepted Answer

The + operator is used for string concatenation, not for repeating strings. To repeat strings, you would use the * operator.

Question 6

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

Accepted Answer

Python interpreter returns the value of a literal as it is without any evaluation or computation.

Question 7

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

Accepted Answer

In Python, 	 represents a horizontal tab, not \b. \b is used to represent a backspace character.

Question 8

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

Accepted Answer

This statement is true. Software development involves the process of planning, designing, coding, testing, and maintaining software programs.

Question 9

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

Accepted Answer

This statement is true. Expressions are a fundamental part of computer programming and allow us to manipulate data values in a variety of ways, including arithmetic operations, string manipulations, and comparisons.

Question 10

1,500 is a valid integer literal in Python.

Accepted Answer

In Python, integer literals cannot contain commas. "1,500" would be considered a string, not an integer.

Question 11

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

Accepted Answer

A floating-point number can be written in scientific notation but it is not required. It can also be written in standard decimal notation. For example, 3.14 is a valid floating-point number in Python.

Question 12

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

Accepted Answer

Text processing is actually a very common application of computing. From basic word processing to natural language processing and machine translation, text processing is used in a wide range of applications.

Question 13

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

Accepted Answer

That is correct, a variable does exactly that.

Question 14

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

Accepted Answer

This is because programming is a complex and iterative process that often involves testing and debugging to identify and fix errors.

Question 15

Modern software development is usually incremental and iterative.

Accepted Answer

Modern software development follows an agile methodology that involves iterative and incremental development.

Question 16

Python is a loosely typed programming language.

Accepted Answer

The answer of 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.

Accepted Answer

Variables can be assigned a value initially and then later reassigned a new value using an assignment statement.

Question 18

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

Accepted Answer

Testing involves creating a plan or strategy, setting up test cases and scenarios, executing tests, and analyzing the results. It requires discipline to follow through with the test plan and make sure that all necessary tests are done.

Question 19

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

Accepted Answer

The cost of developing software is not spread equally over the phases. Different phases of development require different amounts of resources and time, and may have different levels of complexity and risk. Therefore, the cost of each phase can vary significantly.

Question 20

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

Accepted Answer

Real numbers do have infinite precision, meaning that the digits can continue infinitely in the fractional part.

Quiz 2: Software Development Data Types and Expressions