Test Your Knowledge About Ruby Programming! Quiz

2.

The following is a primitive type in Ruby

Integer
String
Float
Char
None of the Above

Correct Answer

A. None of the Above

Explanation

A primitive type is a type that is not an object; i.e. it does not inherit from the Object class

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3.

Variables that start with two '@' symbols are what kind of variables in Ruby

Local variable
Global variable
Instance variable
Class variable
None of the above

Correct Answer

A. Class variable

Explanation

Variables that start with two '@' symbols in Ruby are class variables. Class variables are shared among all instances of a class and can be accessed and modified by any instance of the class. They are defined within the class but outside of any method or constructor.

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1

4.

Variables that start with a capital letter are what kind of variables in Ruby

Local variable
Global variable
Instance variable
Class variable
None of the above

Correct Answer

A. None of the above

Explanation

In Ruby, variables that start with a capital letter are considered constants. Constants are variables whose value cannot be changed once assigned. They are typically used to represent values that are not meant to be modified throughout the program. Therefore, the correct answer is "None of the above" as the given options (local variable, global variable, instance variable, and class variable) do not include constants.

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5.

Variables that start a dollar sign are what kind of variables in Ruby

Local variable
Global variable
Instance variable
Class variable
None of the above

Correct Answer

A. Global variable

Explanation

In Ruby, variables that start with a dollar sign ($) are considered global variables. Global variables can be accessed and modified from anywhere in the program, making them accessible across different scopes and classes. This means that any changes made to a global variable in one part of the program will affect its value in other parts of the program as well.

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6.

Ruby is an object-oriented general-purpose programming language.

True
False

Correct Answer

A. True

Explanation

Ruby allow users to manipulate data structures called objects to build and execute programs.

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1

7.

Which of the following is supported by Ruby?

Multiple Programming Paradigms
Dynamic Type System
Automatic Memory Management
All of the Mentioned

Correct Answer

A. All of the Mentioned

Explanation

Ruby supports all the features because it is a object oriented programming language.

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1

8.

What is the output of the code? print "What's your first name?" first_name=gets.chomp a=first_name.capitalize first_name.capitalize! print "What's your last name?" last_name=gets.chomp b=last_name.capitalize last_name.capitalize puts "My name is #{first_name} #{last_name}"

Amil Jones
What’s your first name? amil What’s your last name? jones My name is Amil Jones
What's your first name? (input) What's your last name? (input) My name is [Capitalized First Name] [Input Last Name]
None of the mentioned

Correct Answer

A. What's your first name? (input) What's your last name? (input) My name is [Capitalized First Name] [Input Last Name]

Explanation

The code prompts the user to enter their first name and stores it in the variable first_name.
It capitalizes the first letter of the first name using .capitalize method and stores it in variable a.
It then capitalizes the first letter of the first name in place using capitalize!.
Next, the code prompts the user to enter their last name and stores it in the variable last_name.
It capitalizes the first letter of the last name using .capitalize method and stores it in variable b.
However, the capitalize method on last_name is not applied in place, so the last name remains unchanged.
Finally, it prints out the message with #{first_name} and #{last_name}, where first_name and last_name are both capitalized due to previous modifications.

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2

9.

What is the output of the given code? x, y, z = 12, 36, 72 puts "The value of x is #{ x }." puts "The sum of x and y is #{ x + y }." puts "The average was #{ (x + y + z)/3 }."

12,48,40
Syntax error
The value of x is 12. The sum of x and y is 48. The average was 40.
None of the mentioned

Correct Answer

A. The value of x is 12. The sum of x and y is 48. The average was 40.

Explanation

x, y, z assigned the values 12, 36, 72 and then arithmetic operations performed on them.

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10.

What does %{Learn ruby language} represents?

“Learn Ruby language”
“%{Learn Ruby language}”
” Learn language ”
None of the mentioned

Correct Answer

A. “Learn Ruby language”

Explanation

In Ruby, %{...} is a way to delimit a string, similar to single or double quotes. It allows for string interpolation and can contain any characters, including spaces and special characters. Therefore, %{Learn Ruby language} represents the string "Learn Ruby language".

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0

11.

What does %x!ls! represents?

Same as back tick command output `ls`
Same as ‘x’
Same as “xls”
None of the mentioned

Correct Answer

A. Same as back tick command output `ls`

Explanation

It is same as back tick command output `ls`.

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12.

Which of the following is the valid string method?

The .length method
The .upcase method
The .downcase method
The .irreverse method

Correct Answer

A. The .irreverse method

Explanation

There is no predefined method which can reverse an already reversed string.

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1

Test Your Knowledge About Ruby Programming! Quiz

Ruby is what kind of programming language?

Quiz Preview

The following is a primitive type in Ruby

Variables that start with two '@' symbols are what kind of variables in Ruby

Variables that start with a capital letter are what kind of variables in Ruby

Variables that start a dollar sign are what kind of variables in Ruby

Ruby is an object-oriented general-purpose programming language.

Which of the following is supported by Ruby?

What is the output of the code? print "What's your first name?" first_name=gets.chomp a=first_name.capitalize first_name.capitalize! print "What's your last name?" last_name=gets.chomp b=last_name.capitalize last_name.capitalize puts "My name is #{first_name} #{last_name}"

What is the output of the given code? x, y, z = 12, 36, 72 puts "The value of x is #{ x }." puts "The sum of x and y is #{ x + y }." puts "The average was #{ (x + y + z)/3 }."

What does %{Learn ruby language} represents?

What does %x!ls! represents?

Which of the following is the valid string method?