Ruby Questions

Q. What is the result of the expression: 5 / 2 in Ruby?

3

2.5

2

3.5

Explanation:

The correct answer to the question is: 2

Q. Why is the library function 'puts'used for?

Prints whatever is given and print it to the screen

None of the mentioned

Prints whatever is given and insert a new(blank) line

Gets input from the user

Explanation:

The correct answer to the question is: Prints whatever is given and insert a new(blank) line

Q. Why do we use comments?

It makes easy for the third person to understand

All of the mentioned

For later use to understand the working of the program

It is an efficient way of programming

Explanation:

The correct answer to the question is: All of the mentioned

Q. Which method is used to convert a string to uppercase in Ruby?

.uppercase

.to_upper

.upcase

.to_uppercase

Explanation:

The correct answer to the question is: .upcase

Q. What does the 'print' method do in Ruby?

Reads input from user

Converts to string

Prints to console

Finds the length

Explanation:

The correct answer to the question is: Prints to console

Q. What is the output of the code?

Amil Jones

My name is Amil jones

What's your first name? amil What's your last name? jones My name is Amil Jones

None of the mentioned

Explanation:

The correct answer to the question is: What's your first name? amil
What's your last name? jones
My name is Amil Jones

Q. What is the output of the given code?

15 19 23

10 20

-5 -5 -5

None of the mentioned

Explanation:

The correct answer to the question is: -5 -5 -5

Q. What is the output of given code?

Undefined method

"I'AM LEARNING RUBY LANGUAGE"

None of the mentioned

I'am Learning RUBY Language

Explanation:

The correct answer to the question is: "I'AM LEARNING RUBY LANGUAGE"

Q. Which of the following is NOT a valid data type in Ruby?

String

Integer

Float

Double

Explanation:

The correct answer to the question is: Double

Q. In Ruby, what does the 'if' statement evaluate?

String

Integer

Boolean value

Expression

Explanation:

The correct answer to the question is: Boolean value

Q. What will be the output of the given code?

False False

None of the mentioned

True False

True True

Explanation:

The correct answer to the question is: True False

Q. Which of the following is a valid variable name in Ruby?

123variable

my_variable

variable-1

_variable

Explanation:

The correct answer to the question is: my_variable

Q. What is the output of the expression: 7 / 2 in Ruby?

3

3.5

4

2

Explanation:

The correct answer to the question is: 3

Q. What is the correct way to cast a string to an integer in Ruby?

string.integer

int(string)

string.to_i

string.convert(:integer)

Explanation:

The correct answer to the question is: string.to_i

Q. What will the following expression evaluate to?
(true && false) | | (!true)

None of the mentioned

False

True

Error

Explanation:

The correct answer to the question is: False

Q. Which of the following is the valid string method?

The .length method

The .downcase method

The .irreverse method

The .upcase method

Explanation:

The correct answer to the question is: The .irreverse method

Q. The downcase method changes the whole string to smallcase letters.

True

False

Explanation:

The correct answer to the question is: True

Q. Which method is used to convert a string to lowercase in Ruby?

.lower

.downcase

.lowercase

.to_lowercase

Explanation:

The correct answer to the question is: .downcase

Q. What is the correct syntax for string interpolation in Ruby?

%(variable)

"#{variable}"

$(variable)

variable.to_string

Explanation:

The correct answer to the question is: "#{variable}"

Q. What is the output of the expression: "5".to_i + 2 in Ruby?

+7

7

"52"

Error

Explanation:

The correct answer to the question is: 7

Q. What is the correct way to define a block in Ruby?

do code end

function code

block { code }

block code

Explanation:

The correct answer to the question is: block { code }

Q. What is the result of the expression: 9 / 2 in Ruby?

4.5

2.5

2

4

Explanation:

The correct answer to the question is: 2.5

Q. What will the following expression evaluate to?
true | | false

Error

False

None of the mentioned

True

Explanation:

The correct answer to the question is: True

Q. Which sequence can be used to substitute the value of any ruby expression in a string?

#expr

None of the mentioned

#{expr}

#(expr)

Explanation:

The correct answer to the question is: #{expr}

Q. The following is the correct way to use multiline comment.

False

True

Explanation:

The correct answer to the question is: False

Q. What is the output of the following?

4

Error in compilation

Undefined local variable ruby

ybur

Explanation:

The correct answer to the question is: Undefined local variable ruby

Q. What is the purpose of the require keyword in Ruby?

Loads a specific Ruby file

Defines a new module

Creates a new class

Imports external libraries

Explanation:

The correct answer to the question is: Imports external libraries

Q. What is the correct way to define a symbol in Ruby?

symbol = 'value'

symbol = "value"

symbol = :value

symbol = Symbol("value")

Explanation:

The correct answer to the question is: symbol = :value

Q. What is the correct syntax for accessing a class method?

Class.new.method_name

Class.method_name

method_name(Class)

object.method_name

Explanation:

The correct answer to the question is: Class.method_name

Q. Why is gets not preferred instead of gets.chomp?

Gets add an extra new line while chomp removes it

Gets remove an extra new line

Chomp erases the value stored in the variable

All of the mentioned

Explanation:

The correct answer to the question is: Gets add an extra new line while chomp removes it

Q. The '=' is used for assigning value to variable?

False

True

Explanation:

The correct answer to the question is: True

Q. Which of the following is the correct way to define a variable in Ruby?

name = value

variable name = value

var var_name = value

var_name = value

Explanation:

The correct answer to the question is: var_name = value

Q. What is the result of the expression: 3 ** 3 in Ruby?

3

6

9

27

Explanation:

The correct answer to the question is: 27

Q. What is the default file extension for Ruby files?

.ruby

.rby

.rb

.ru

Explanation:

The correct answer to the question is: .rb

Q. What do we mean by expression substitution?

None of the mentioned

Storing string value

Embedding the value of Ruby expression into a string using #{ }

Substituting string functions

Explanation:

The correct answer to the question is: Embedding the value of Ruby expression into a string using #{ }

Q. What is the extension used for saving the ruby file?

.rb extension

.ruby extension

None of the mentioned

.rrb extension

Explanation:

The correct answer to the question is: .rb extension

Q. What is the correct syntax to declare and initialize a variable in Ruby?

variable_name = value

var var_name = value

variable var_name = value

var_name = value

Explanation:

The correct answer to the question is: variable_name = value

Q. Which of the following features does the 2.0 version of ruby supports?

New literals

Method keyword arguments

Security fixes

All of the mentioned

Explanation:

The correct answer to the question is: All of the mentioned

Q. How do you check the truthiness of a value in Ruby?

if value do code end

if value.is_truthy?

if value != false

if (value) then code end

Explanation:

The correct answer to the question is: if value != false

Q. How do you get the current date and time in Ruby?

date = Date.now

datetime = DateTime.now

time = Time.now

now = Date.today

Explanation:

The correct answer to the question is: time = Time.now

Q. What is the correct syntax for a multiline comment in Ruby?

''' ... '''

# ... #

/* ... */

// ... //

Explanation:

The correct answer to the question is: ''' ... '''

Q. What does the && operator do in Ruby?

Logical NOT

Bitwise AND

Logical AND

Logical OR

Explanation:

The correct answer to the question is: Logical AND

Q. What is the correct way to concatenate two strings in Ruby?

str1.append(str2)

str1.concat(str2)

str1.combine(str2)

str1 + str2

Explanation:

The correct answer to the question is: str1 + str2

Q. In Ruby, what is the keyword used to define a constant?

constant name : value

constantName(value)

constant_name = value

CONSTANT_NAME = value

Explanation:

The correct answer to the question is: CONSTANT_NAME = value

Q. Which operator is used for exponentiation in Ruby?

^

//

^^

**

Explanation:

The correct answer to the question is: **

Q. What symbol is used to denote the end of a statement in Ruby?

:

;

,

.

Explanation:

The correct answer to the question is: ;

Q. What is the size of an integer data type in ruby?

-2 to 2

Explanation:

The correct answer to the question is: -2 to 2

Q. What does the 'chomp' method do in Ruby?

Reads input from user

Removes trailing whitespace

Splits a string

Converts to integer

Explanation:

The correct answer to the question is: Removes trailing whitespace

Q. What does the 'gets' method do in Ruby?

Finds the length

Prints to console

Reads input from user

Converts to string

Explanation:

The correct answer to the question is: Reads input from user

Q. How do you call a method in Ruby?

object.method_name()

object.method_name

method_name()

method_name(object)

Explanation:

The correct answer to the question is: object.method_name

Q. Which of these operators is used for string concatenation?

+

-

*

/

Explanation:

The correct answer to the question is: +

Q. In Ruby, what is the default file extension for Ruby files?

.rb

.rby

.ru

.ruby

Explanation:

The correct answer to the question is: .rb

Q. What does the **= assignment operator do?

It is the multiplication operator.

It is used as exponent like 2**3=8

None of the mentioned

Multiplies the value twice

Explanation:

The correct answer to the question is: It is used as exponent like 2**3=8

Q. How do you break out of a loop in Ruby?

end()

exit()

break()

continue()

Explanation:

The correct answer to the question is: break()

Q. first_name,Last_name=gets.chomp,gets.chomp is the correct way to get the input from the user.

False

True

Explanation:

The correct answer to the question is: True

Q. What is the correct way to declare a variable in Ruby without assigning a value?

var_name = ""

var_name

None of the above

var_name = nil

Explanation:

The correct answer to the question is: var_name

Q. What is the correct syntax for creating a hash in Ruby?

hash = {}

Hash.new("key", "value")

hash.add("key", "value")

{"key1": "value1", "key2": "value2"}

Explanation:

The correct answer to the question is: {"key1": "value1", "key2": "value2"}

Q. Which of the following is a valid assignment operator?

*=

All of the mentioned

+=

-=

Explanation:

The correct answer to the question is: All of the mentioned

Q. Which of the following is the correct way to define a constant in Ruby?

CONSTANT_NAME = value

constant_name : value

constant_name = value

constantName(value)

Explanation:

The correct answer to the question is: CONSTANT_NAME = value

Q. Which of the following languages syntax matches with the Ruby's syntax?

PHP

Jquery

Java

Perl

Explanation:

The correct answer to the question is: Perl

Q. What is the correct way to declare and initialize an array in Ruby?

array_name = []

array_name = array[]

array array_name = []

array = array_name[]

Explanation:

The correct answer to the question is: array_name = []

Q. How do you access a value from a hash in Ruby?

hash.find("key")

hash.at("key")

hash["key"]

hash.get("key")

Explanation:

The correct answer to the question is: hash["key"]

Q. How do you add two numbers in Ruby?

b.add(a)

a.add(b)

a + b

add(a, b)

Explanation:

The correct answer to the question is: a + b

Q. Which symbol is used for the modulo operation in Ruby?

&

*

/

%

Explanation:

The correct answer to the question is: %

Q. How do you pass arguments to a method in Ruby?

method_name(arg1, arg2)

method_name arg1 arg2

method_name.with(arg1, arg2)

method_name { arg1, arg2 }

Explanation:

The correct answer to the question is: method_name(arg1, arg2)

Q. What is the correct way to declare and initialize a variable in Ruby?

variable_name = value

variable var_name = value

var var_name = value

var_name = value

Explanation:

The correct answer to the question is: variable_name = value

Q. Which of the following is the correct way to declare a constant in Ruby?

constant_name : value

CONSTANT_NAME = value

constantName(value)

constant_name = value

Explanation:

The correct answer to the question is: CONSTANT_NAME = value

Q. What will we the output of the given code?

i'AM lEARNING ruby lANGUAGE

iam learning ruby language

"i'am learning ruby language"

unterminated string meets end of file

Explanation:

The correct answer to the question is: unterminated string meets end of file

Q. How do you compare two objects in Ruby?

compare(object1, object2)

object1.equals(object2)

object1 === object2

object1 == object2

Explanation:

The correct answer to the question is: object1 == object2

Q. What is the correct way to define a conditional statement in Ruby?

if condition: code

if (condition) { code }

when condition; code

if condition then code end

Explanation:

The correct answer to the question is: if (condition) { code }

Q. Which of the following is the correct way to define a range in Ruby?

<1,10>

{1..10}

(1..10)

[1 to 10]

Explanation:

The correct answer to the question is: (1..10)

Q. What will be the output of the following?

YBUR

RUBY

ybuR

YBUr

Explanation:

The correct answer to the question is: YBUR

Q. What is the result of the expression: 6 / 2 in Ruby?

2

3

12

2.5

Explanation:

The correct answer to the question is: 2

Q. What is the correct way to define an array in Ruby?

array = ["element1", "element2"]

array = Array.new

array = list("element1", "element2")

array = new Array

Explanation:

The correct answer to the question is: array = ["element1", "element2"]

Q. We use semicolon or parentheses after every print or puts statement.

False

True

Explanation:

The correct answer to the question is: False

Q. What does the .upcase method do?

Convert the string to uppercase

None o the mentioned

Convert only lowercase string to uppercase and vice-versa

Convert the string to lowercase

Explanation:

The correct answer to the question is: Convert the string to uppercase

Q. What is the method used to convert a string to lowercase in Ruby?

.to_lower

.downcase

.lower

.to_lowercase

Explanation:

The correct answer to the question is: .downcase

Q. What is the output of the expression: "5" + "2" in Ruby?

7

Error

"7"

52

Explanation:

The correct answer to the question is: 52

Q. Which of the following is the correct way to declare a variable in Ruby with a default value?

var_name => value

var_name << value

var_name = value

var_name := value

Explanation:

The correct answer to the question is: var_name = value

Q. Which of the following are used for comparison?

All of the mentioned

Not equal to

Less than or greater than

Equal to

Explanation:

The correct answer to the question is: All of the mentioned

Q. Which of the following is supported by Ruby?

Dynamic Type System

All of the Mentioned

Automatic Memory Management

Multiple Programming Paradigms

Explanation:

The correct answer to the question is: All of the Mentioned

Q. Which method is used to convert a string to an array of characters in Ruby?

.split

.to_array

.chars

.to_chars

Explanation:

The correct answer to the question is: .chars

Q. Which operator is used for subtraction in Ruby?

-

+

*

/

Explanation:

The correct answer to the question is: -

Q. In Ruby, what is the keyword used to define a loop that repeats until a condition is true?

repeat

until

while

loop

Explanation:

The correct answer to the question is: until

Q. What is the result of the expression: 10 % 3 in Ruby?

3

1.33

1

Explanation:

The correct answer to the question is: 1

Q. What is the difference between nil and false?

nil represents absence of value, false represents a boolean value

Both are the same

nil is a string, false is a boolean

nil is a number, false is a boolean

Explanation:

The correct answer to the question is: nil represents absence of value, false represents a boolean value

Q. Which symbol is used to concatenate strings in Ruby?

<<

+

:

.

Explanation:

The correct answer to the question is: <<

Q. What is the default return value of a method in Ruby?

The value of the last expression

nil

TRUE

FALSE

Explanation:

The correct answer to the question is: nil

Q. Ruby does not support ++ operator, it only supports += operator.

True

False

Explanation:

The correct answer to the question is: True

Q. Space between 2+5 or 2 + 5 is valid but =begin and = begin is not valid.

True

False

Explanation:

The correct answer to the question is: True

Q. Methods should not be written inside double quotes.

True

False

Explanation:

The correct answer to the question is: True

Q. What is the sequence of ruby strings?

None of the mentioned

16-bit bytes

8-bit bytes

10-bit bytes

Explanation:

The correct answer to the question is: 8-bit bytes

Q. What does the 'puts' method do in Ruby?

Reads input from user

Prints to console

Finds the length

Converts to string

Explanation:

The correct answer to the question is: Prints to console

Q. What is the difference between =~ and == operators?

None of the above

Both operators are the same

=~ checks for equality, == checks for string pattern matching

=~ checks for string pattern matching, == checks for equality

Explanation:

The correct answer to the question is: =~ checks for string pattern matching, == checks for equality

Q. In Ruby, what is the keyword used to define a method?

define

def

method

function

Explanation:

The correct answer to the question is: def

Q. How to comment a single line?

None of the mentioned

Using //

Using begin and end

Using #

Explanation:

The correct answer to the question is: Using #

Q. It is must for Ruby to use a compiler.

True

False

Explanation:

The correct answer to the question is: False

Q. Which method is used to find the length of an array in Ruby?

.size

.count

.length_of

.length

Explanation:

The correct answer to the question is: .length

Q. What symbol is used to denote comments in Ruby?

--

/* */

#

//

Explanation:

The correct answer to the question is: #

Q. The .length method is used to check number of characters.

False

True

Explanation:

The correct answer to the question is: False

Q. What will the following code evaluate to?

False

Syntax error

True

None of the mentioned

Explanation:

The correct answer to the question is: True

Q. What does the notataion \b stands for?

Escape

Space

Backspace

Newline

Explanation:

The correct answer to the question is: Backspace

Q. Which method is used to check if a string contains a specific substring in Ruby?

.contains

.include?

.exist

.hasSubstring

Explanation:

The correct answer to the question is: .include?

Q. How do you define a range in Ruby?

range = "start..end"

range = Range.new("start", "end")

range = start..end

range = start.to(end)

Explanation:

The correct answer to the question is: range = start..end

Q. What is the data type of the value "true" in Ruby?

String

Float

Boolean

Integer

Explanation:

The correct answer to the question is: Boolean

Q. Which method is used to check if a variable is nil in Ruby?

.is_nil?

.empty?

.null?

.nil?

Explanation:

The correct answer to the question is: .nil?

Q. What is the method used to check the data type of a variable in Ruby?

.type

.class

.datatype

.typeof

Explanation:

The correct answer to the question is: .class

Q. What are the different types of comments in Ruby?

Single-line // and multi-line """ """

Single-line # and multi-line """ """

Single-line # and multi-line ``

Single-line // and multi-line /* */

Explanation:

The correct answer to the question is: Single-line # and multi-line """ """

Q. Which of the following datatypes are valid in Ruby?

Numbers

All of the mentioned

Boolean

String

Explanation:

The correct answer to the question is: All of the mentioned

Q. What is the method used to check if a variable is empty in Ruby?

.has_content?

.empty?

.null?

.is_empty?

Explanation:

The correct answer to the question is: .empty?

Q. Ruby can deal with both numbers and floating point values.

True

False

Explanation:

The correct answer to the question is: True

Q. What does %x!ls! represents?

None of the mentioned

Same as back tick command output 'ls'

Same as 'x'

Same as "xls"

Explanation:

The correct answer to the question is: Same as back tick command output 'ls'

Q. What is the purpose of the gem command in Ruby?

Compiles Ruby code

Defines Ruby classes

Runs Ruby code

Installs and manages Ruby libraries

Explanation:

The correct answer to the question is: Installs and manages Ruby libraries

Q. What is the correct syntax for defining a variable in Ruby?

variable name = value

var name = "value"

name: value

name = value

Explanation:

The correct answer to the question is: name = value

Q. Boolean opeartors are also known as logical operators.

True

False

Explanation:

The correct answer to the question is: True

Q. The == 'is equal to' is known as relational operator.

False

True

Explanation:

The correct answer to the question is: True

Q. Which of the following is a valid boolean operator?

All of the mentioned

and(&&)

or(| |)

not(!)

Explanation:

The correct answer to the question is: All of the mentioned

Q. Ruby is a case-sensitive language.

False

True

Explanation:

The correct answer to the question is: True

Q. Ruby can be used for developing internet and intranet applications.

False

True

Explanation:

The correct answer to the question is: True

Q. In Ruby, what is the correct way to define a constant?

constant_name(value)

constant name : value

CONSTANT_NAME = value

constant_name = value

Explanation:

The correct answer to the question is: CONSTANT_NAME = value

Q. Which of the following is not a valid library function?

Puts

Gets

Print

Get

Explanation:

The correct answer to the question is: Get

Q. What will any variable evaluate to if it is of Boolean data type?

Nil

Either True or False

False

True

Explanation:

The correct answer to the question is: Either True or False

Q. Which of the following is the correct way to start a single-line comment in Ruby?

--

#

//

/*

Explanation:

The correct answer to the question is: #

Q. How to comment multiple lines in ruby?

All of the mentioned

Using single line comments

No option to comment

Using multiline comments

Explanation:

The correct answer to the question is: Using multiline comments

Q. What is the result of the expression: true && false in Ruby?

FALSE

nil

TRUE

Error

Explanation:

The correct answer to the question is: FALSE

Q. What is the output of the expression: "hello" + "world" in Ruby?

helloworld

"hello" "world"

hello+world

hello world

Explanation:

The correct answer to the question is: helloworld

Q. What is the method used to check if a string contains a specific substring in Ruby?

.include?

.hasSubstring

.exist

.contains

Explanation:

The correct answer to the question is: .include?

Q. For getting an input from the user which method is used?

get

gets.chomp

chomp

get-s

Explanation:

The correct answer to the question is: gets.chomp

Q. What is the use of .capitalize method?

It capitalize the strings which are in small case

It capitalizes the entire string

It capitalize on the first letter of the string

All of the mentioned

Explanation:

The correct answer to the question is: It capitalize on the first letter of the string

Q. What is the correct way to declare a variable in Ruby?

const name = "value"

let name = "value"

name = "value"

var name = "value"

Explanation:

The correct answer to the question is: name = "value"

Q. The .upcase and .capitalize method are used for capitalizing the whole string.

True

False

Explanation:

The correct answer to the question is: False

Q. What does %Q{ Learn ruby language } represents?

" learn ruby language "

None of the mentioned

"%{ Learn Ruby language }"

" Learn Ruby language "

Explanation:

The correct answer to the question is: " Learn Ruby language "

Q. What is the correct syntax for printing a message to the console?

console.log("message")

write("message")

print("message")

puts("message")

Explanation:

The correct answer to the question is: puts("message")

Q. The following syntax is used for multiline comment.

False

True

Explanation:

The correct answer to the question is: True

Q. Which of the following is not a valid datatype?

Integer

Binary

Float

Timedate

Explanation:

The correct answer to the question is: Timedate

Q. This the right way to comment a single line.

True

False

Explanation:

The correct answer to the question is: True

Q. What is the output of the expression: "10" * 3 in Ruby?

"101010"

1010

Error

30

Explanation:

The correct answer to the question is: "101010"

Q. The given two expression means the same.

True

False

Explanation:

The correct answer to the question is: True

Q. What is the correct way to define a method in Ruby?

function method_name(parameters) code

method_name(parameters) -> code

method method_name(parameters) = code

def method_name(parameters) code end

Explanation:

The correct answer to the question is: def method_name(parameters) code end

Q. What is the method used to check if a variable is defined in Ruby?

.exist?

.defined?

.is_defined?

.has_value?

Explanation:

The correct answer to the question is: .defined?

Q. Ruby can be embedded into Hypertext Markup Language(HTML).

False

True

Explanation:

The correct answer to the question is: True

Q. What does the 'return' keyword do in Ruby methods?

Continues the loop

Exits the method with a value

Converts to integer

Prints to console

Explanation:

The correct answer to the question is: Exits the method with a value

Q. What is the method used to check if a variable is of a specific class in Ruby?

.is_a?

.type_of

.typeof

.class_of

Explanation:

The correct answer to the question is: .is_a?

Q. What does %{Learn ruby language} represents?

"%{Learn Ruby language}"

"Learn Ruby language"

None of the mentioned

" Learn Ruby language "

Explanation:

The correct answer to the question is: "Learn Ruby language"

Q. What is the result of the expression: 4 > 2 && 5 < 7 in Ruby?

TRUE

Error

nil

FALSE

Explanation:

The correct answer to the question is: TRUE

Q. The boolean operator && only result in true when both the values are true?

True

False

Explanation:

The correct answer to the question is: True

Q. What is the method used to check if a variable is numeric in Ruby?

.is_numeric?

.numeric?

.numeric_value?

.number?

Explanation:

The correct answer to the question is: .is_numeric?

Q. Assignment operator is also known as relational operator.

True

False

Explanation:

The correct answer to the question is: True

Q. Why can not we use quotation marks (' or ") with boolean?

It indicates that that we are replacing boolean data type with string data type

It indicates that we are assining a value

It indicates that we are talking about a string

None of the mentioned

Explanation:

The correct answer to the question is: It indicates that we are talking about a string

Q. Which of the following is a valid way to declare a variable in Ruby?

myVar = 10

myVar

myVar = "10"

10 = myVar

Explanation:

The correct answer to the question is: myVar = 10

Q. In Ruby, what is the keyword used to define a class?

define

cls

defclass

class

Explanation:

The correct answer to the question is: class

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

False

True

Explanation:

The correct answer to the question is: True

Q. What is the data type of the value "Hello, World" in Ruby?

Float

Boolean

Integer

String

Explanation:

The correct answer to the question is: String

Q. What is the output of the the given code?

My name is #{Name}

Error in compilation

Name variable not defined earlier

Undefined Error

Explanation:

The correct answer to the question is: Name variable not defined earlier