Deck 3: Working With Strings, Objects, and Variables

Question 1

Concatenation is performed using the & character.

Answer 1

False

Question 2

Interpolation is the process of substituting the value of an expression or variable inside a string.

Answer 2

True

Question 3

Objects are partially self-contained entities designed to work with methods and properties stored externally to itself.

Answer 3

False

Question 4

Escape characters provide the ability to embed instructions into text strings that tell Ruby how to format displayed text.

Question 5

Single-quoted strings support both escaping and variable substitution.

Question 6

You can create new strings by multiplying existing strings using the String class's * method.

Question 7

Concatenation is the process of splitting a string into two smaller strings.

Question 8

Ruby is not an object-oriented programming language.

Question 9

An attr_accessor is a keyword that identifies a list of one or more object properties.

Question 10

Text plays a big role in many scripts when communicating with users. Text strings in Ruby can consist of letters, numbers, special characters and even blank spaces.

Question 11

To compare two strings to see if they are equal the = operator must be used.

Question 12

Objet properties are implemented as named variables.

Question 13

When working with #{} , Ruby is able to perform variable substitution.

Question 14

A method is an object attribute stored as a variable that describes a particular aspect or feature of the object.

Question 15

When creating multiline text strings using the %q{ and } and %Q{ and } characters, you can substitute any characters you wish in place of the { and } characters.

Question 16

Creating a string by embedding characters inside the %q{ and } characters is equivalent to embedding them within double quotes.

Question 17

new is a method that initiates the creation of a new object.

Question 18

The String class's swapcase method converts a string to all uppercase letters.

Question 19

When working with double-quotes, Ruby is not able to perform escaping.

Question 20

The advantage of using %q{ and } and %Q{ and } characters in place of quotation marks is that these characters allow for the creation of strings that span multiple lines.

Question 21

Which of the following variable names is invalid?

A) Final Score
B) Player#
C) @Score
D) All of the above

Question 22

Ruby supports a number of different types of numeric classes, including all of the following except ____.

A) Integer
B) Float
C) String
D) Fixnum

Question 23

Inheritance is an object-oriented process that allows one class to be used as the basis for the definition of another class.

Question 24

Ruby variable names are:

A) Case sensitive
B) Case insensitive
C) Case neutral
D) None of the above

Question 25

The childclass operator is used to create a new class based on an existing (parent) class.

Question 26

Which of the following methods should be used to convert a numeric value to an integer?

A) i!
B) int_conv
C) to_int
D) to_i

Question 27

In Ruby variable scope is indicated by the first character in a variable's name. The character used to specify a global variable is?

A) $
B) @
C) @@
D) None of the above

Question 28

In Ruby variable names must be formulated in accordance in a very specific set of rules. These rules includes all of the following except:

A) Variable names must begin with a number
B) Variable names cannot include underscore characters
C) Variable names may include blank spaces
D) All of the above

Question 29

Which of the following methods does not belong to the String class?

A) capitalize
B) chop
C) reverse
D) None of the above

Question 30

When the user presses Enter in order to submit input, Ruby automatically appends an end of line marker to the end of the input. This end of line marker can be removed using what method?

A) chop
B) cut
C) remove
D) None of the above

Question 31

Which of the following operators is the Ruby assignment operator?

A) ==
B) equals
C) =
D) None of the above

Question 32

One of the primary benefits of object-oriented programming is its ability to allow programmers to model the creation of classes based on real life concepts.

Question 33

Which of the following variable names is valid?

A) Total Score
B) TotalScore
C) 123Count
D) Score#

Question 34

Ruby requires that programmers specify a numeric class type, otherwise errors occur.

Question 35

Ruby supports a number of different types of scope, including ____.

A) Local
B) Remote
C) Module
D) None of the above

Question 36

Which of the following operators can be used to automatically increment a variable's value?

A) +_+
B) +=
C) =,=
D) plus

Question 37

Which of the following escape characters can be used to embed a new line feed instruction inside a text string?

A) \b
B) \f
C) \n
D) \t

Question 38

A numeric value can be converted to a string using which of the following methods?

A) to_t
B) to_text
C) conv_t
D) to_s

Question 39

Which of the following statements correctly defines local variable scope?

A) Scope is limited to objects of the class
B) Scope has not limit
C) Scope is limited to the loop, module, class or method in which it is defined
D) None of the above

Question 40

A module is a container use to group classes, method, and constants.

Question 41

One of the differences between Ruby and many other programming languages is that ____.

A) Ruby Rill halt script execution if an attempt is made to change a constant's value
B) Ruby will allow the same name to be assigned to both a constant and a variable
C) Ruby will generate an error is a constant's value is change but will not halt script execution
D) None of the above

Question 42

Which of the following is a valid string?

A) " Once upon a time"
B) "1 2 3 4 5"
C) %Q{Once upon a time}
D) All of the above

Question 43

Which of the following constructions is used as the basis for defining objects?

A) Method
B) Class
C) Property
D) None of the above

Question 44

Which of the following is not true about Ruby?

A) It is an object-oriented language
B) It is an interpreted language
C) It is a case-sensitive language
D) None of the above

Question 45

A case code block is ____.

A) A structure for implementing conditional logic
B) A structure for implementing a loop
C) A structure for creating complex arrays
D) None of the above

Question 46

A loop is ____.

A) A structure for implementing conditional logic
B) A collection of program statements that are repeatedly executed
C) A program statement that allows a script to be restarted
D) None of the above

Question 47

Which of the following statements is false?

A) Ruby permits an existing class to be used as the basis for defining a new class
B) Child classes must be identical to the parent class upon which they are based and cannot be further modified
C) Custom classes can be used to model the creation of real life concepts
D) All of the above

Question 48

A constant is very similar to variable, expect that:

A) A constant's value cannot be changed without generating an error
B) A constant's value is limited to string data
C) Constants can only be defined with local scope
D) None of the above

Question 49

Ruby provides the ability to generate random numbers using what method?

A) random
B) rand
C) r_!
D) None of the above

Question 50

Which of the following is a true statement about constants?

A) Constant names must begin with the underscore character
B) Constant names must begin with a capital letter
C) Constant names are limited to a maximum of 12 characters
D) Both b and c