Ruby Questions

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

2.5

3.5

2

3

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

Gets input from the user

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

Explanation:

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

Q. Why do we use comments?

For later use to understand the working of the program

It is an efficient way of programming

It makes easy for the third person to understand

All of the mentioned

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?

Converts to string

Reads input from user

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

None of the mentioned

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

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?

None of the mentioned

15 19 23

-5 -5 -5

10 20

Explanation:

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

Q. What is the output of given code?

None of the mentioned

Undefined method

I'am Learning RUBY Language

"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?

Integer

Double

Float

String

Explanation:

The correct answer to the question is: Double

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

Expression

Integer

String

Boolean value

Explanation:

The correct answer to the question is: Boolean value

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

True True

False False

True False

None of the mentioned

Explanation:

The correct answer to the question is: True False

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

my_variable

variable-1

123variable

_variable

Explanation:

The correct answer to the question is: my_variable

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

3.5

3

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.to_i

string.integer

string.convert(:integer)

int(string)

Explanation:

The correct answer to the question is: string.to_i

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

Error

None of the mentioned

True

False

Explanation:

The correct answer to the question is: False

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

The .upcase method

The .irreverse method

The .downcase method

The .length 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

.lowercase

.to_lowercase

.downcase

Explanation:

The correct answer to the question is: .downcase

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

"#{variable}"

%(variable)

variable.to_string

$(variable)

Explanation:

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

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

7

Error

"52"

+7

Explanation:

The correct answer to the question is: 7

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

function code

block code

do code end

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

4.5

2

2.5

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

Undefined local variable ruby

ybur

Error in compilation

Explanation:

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

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

Imports external libraries

Loads a specific Ruby file

Creates a new class

Defines a new module

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 = Symbol("value")

symbol = :value

symbol = "value"

Explanation:

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

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

Class.method_name

Class.new.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

All of the mentioned

Chomp erases the value stored in the variable

Gets remove an extra new line

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?

var var_name = value

var_name = value

name = value

variable 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?

6

3

27

9

Explanation:

The correct answer to the question is: 27

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

.rb

.ruby

.ru

.rby

Explanation:

The correct answer to the question is: .rb

Q. What do we mean by expression substitution?

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

Substituting string functions

None of the mentioned

Storing string value

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

None of the mentioned

.ruby extension

.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?

var var_name = value

variable var_name = value

var_name = value

variable_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?

All of the mentioned

Method keyword arguments

New literals

Security fixes

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) then code end

if value.is_truthy?

if value != false

if value do 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?

time = Time.now

now = Date.today

datetime = DateTime.now

date = Date.now

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?

Bitwise AND

Logical AND

Logical NOT

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 + str2

str1.append(str2)

str1.combine(str2)

str1.concat(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

constant_name = value

constantName(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?

Converts to integer

Reads input from user

Splits a string

Removes trailing whitespace

Explanation:

The correct answer to the question is: Removes trailing whitespace

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

Converts to string

Prints to console

Reads input from user

Finds the length

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?

.ru

.rby

.ruby

.rb

Explanation:

The correct answer to the question is: .rb

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

Multiplies the value twice

It is the multiplication operator.

None of the mentioned

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

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?

continue()

exit()

break()

end()

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.

True

False

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 = nil

var_name

var_name = ""

None of the above

Explanation:

The correct answer to the question is: var_name

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

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

hash = {}

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

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

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?

constantName(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 languages syntax matches with the Ruby's syntax?

PHP

Perl

Java

Jquery

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[]

array = array_name[]

array array_name = []

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.get("key")

hash.at("key")

hash["key"]

Explanation:

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

Q. How do you add two numbers in Ruby?

a + b

a.add(b)

add(a, b)

b.add(a)

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.with(arg1, arg2)

method_name(arg1, arg2)

method_name 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?

var_name = value

variable var_name = value

var var_name = value

variable_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

constantName(value)

CONSTANT_NAME = 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?

unterminated string meets end of file

iam learning ruby language

"i'am learning ruby language"

i'AM lEARNING ruby lANGUAGE

Explanation:

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

Q. How do you compare two objects in Ruby?

object1 === object2

object1 == object2

compare(object1, object2)

object1.equals(object2)

Explanation:

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

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

when condition; code

if (condition) { code }

if 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 to 10]

{1..10}

<1,10>

Explanation:

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

Q. What will be the output of the following?

RUBY

YBUR

YBUr

ybuR

Explanation:

The correct answer to the question is: YBUR

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

12

3

2.5

2

Explanation:

The correct answer to the question is: 2

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

array = new Array

array = Array.new

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

array = ["element1", "element2"]

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 only lowercase string to uppercase and vice-versa

None o the mentioned

Convert the string to uppercase

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?

.lower

.downcase

.to_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?

Equal to

Less than or greater than

Not equal to

All of the mentioned

Explanation:

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

Q. Which of the following is supported by Ruby?

Automatic Memory Management

All of the Mentioned

Multiple Programming Paradigms

Dynamic Type System

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

.chars

.to_array

.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?

while

until

repeat

loop

Explanation:

The correct answer to the question is: until

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

1

1.33

3

Explanation:

The correct answer to the question is: 1

Q. What is the difference between nil and false?

nil is a number, false is a boolean

nil represents absence of value, false represents a boolean value

Both are the same

nil is a string, 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?

FALSE

The value of the last expression

nil

TRUE

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

8-bit bytes

10-bit bytes

16-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

Converts to string

Finds the length

Prints to console

Explanation:

The correct answer to the question is: Prints to console

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

Both operators are the same

None of the above

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

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

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?

method

define

function

def

Explanation:

The correct answer to the question is: def

Q. How to comment a single line?

Using //

Using begin and end

None of the mentioned

Using #

Explanation:

The correct answer to the question is: Using #

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

False

True

Explanation:

The correct answer to the question is: False

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

.length

.count

.length_of

.size

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

True

None of the mentioned

Syntax error

Explanation:

The correct answer to the question is: True

Q. What does the notataion \b stands for?

Space

Backspace

Newline

Escape

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 = start..end

range = start.to(end)

range = Range.new("start", "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

Integer

Float

Boolean

Explanation:

The correct answer to the question is: Boolean

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

.null?

.empty?

.is_nil?

.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?

.typeof

.class

.datatype

.type

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?

Boolean

All of the mentioned

Numbers

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?

.is_empty?

.empty?

.has_content?

.null?

Explanation:

The correct answer to the question is: .empty?

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

False

True

Explanation:

The correct answer to the question is: True

Q. What does %x!ls! represents?

Same as "xls"

Same as 'x'

None of the mentioned

Same as back tick command output 'ls'

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

Runs Ruby code

Defines Ruby classes

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?

name = value

name: value

var name = "value"

variable 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

or(| |)

not(!)

and(&&)

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.

True

False

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

False

True

Either True or False

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?

Using multiline comments

No option to comment

All of the mentioned

Using single line comments

Explanation:

The correct answer to the question is: Using multiline comments

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

TRUE

FALSE

Error

nil

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 on the first letter of the string

It capitalize the strings which are in small case

All of the mentioned

It capitalizes the entire string

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?

var name = "value"

let name = "value"

name = "value"

const 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 }"

" 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 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

Timedate

Binary

Float

Explanation:

The correct answer to the question is: Timedate

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

False

True

Explanation:

The correct answer to the question is: True

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

30

Error

1010

"101010"

Explanation:

The correct answer to the question is: "101010"

Q. The given two expression means the same.

False

True

Explanation:

The correct answer to the question is: True

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

def method_name(parameters) code end

method method_name(parameters) = code

function method_name(parameters) code

method_name(parameters) -> code

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?

.has_value?

.is_defined?

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?

Prints to console

Continues the loop

Converts to integer

Exits the method with a value

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?

.class_of

.typeof

.type_of

Explanation:

The correct answer to the question is: .is_a?

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

"Learn Ruby language"

"%{Learn Ruby language}"

" Learn Ruby language "

None of the mentioned

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?

False

True

Explanation:

The correct answer to the question is: True

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

.number?

.is_numeric?

.numeric_value?

.numeric?

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?

None of the mentioned

It indicates that we are assining a value

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

It indicates that we are talking about a string

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

myVar = "10"

10 = myVar

myVar = 10

Explanation:

The correct answer to the question is: myVar = 10

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

define

defclass

class

cls

Explanation:

The correct answer to the question is: class

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

True

False

Explanation:

The correct answer to the question is: True

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

String

Integer

Float

Boolean

Explanation:

The correct answer to the question is: String

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

Undefined Error

Name variable not defined earlier

Error in compilation

My name is #{Name}

Explanation:

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