Ruby on Rails MCQs
Ruby on Rails MCQs
Our team has conducted extensive research to compile a set of Ruby on Rails MCQs. We encourage you to test your Ruby on Rails knowledge by answering these multiple-choice questions provided below.
Simply scroll down to begin!
1: What command do you run to undo the last 5 migrations
A. rake db:rollback STEP=5
B. database_undo
C. rake db:drop
D. rake db:rollback
2: A global variable has a name beginning with:
A. $
B. %
C. @
D. @@
3: What gets returned by: [1, [2, 3,[4, 5]]].flatten
A. [1, 2, 3, 4, 5]
B. [1, [2, 3, 4, 5]]
C. [2, 3, [4, 5]]
D. [1, 2, 3, [4, 5]]
E. {1: [2, 3, [4, 5]]}
4: How can you create a new Rails project?
A. 'rails new /path/to/new/app'
B. 'rails /path/to/new/app'
C. 'rails create /path/to/new/app'
5: Which of the following will delete the key-value 1 from array: "big_data"?
A. big_data.del(1)
B. big_data.del[1]
C. big_data.delete(1)
6: What is the use of $ in Ruby?
A. $ in Ruby is treated as a class variable
B. $ in Ruby is treated as a global variable
7: What is the use of @@ in Ruby?
A. class variable
B. instance variable
8: Which is NOT a default Rails environment?
A. sandbox
B. test
C. development
D. production
9: What is a Gem?
A. A configuration item
B. Functionality in a package
10: Which extension is default for views html templates?
A. .erb
B. .slim
C. .rabl
D. .haml
11: In the MVC pattern:
A. MVC are the initials of the creator, Michael Vincent Clantor.
B. mySQL is the database, vi is the text editor, and C++ is the language.
C. models represent the data, views display the data, and controllers respond to user interactions
D. manipulators handle data, validators ensure data integrity, and communicators transfer information between them.
12: What is the command to install Rails?
A. gem install ruby_on_rails
B. gem install ror
C. gem install rails
13: What command do you run to create your database?
A. database_create
B. rake db:migrate
C. rake db:create
D. rails create
14: What command do you run to drop your database?
A. rails destroy
B. rake db:drop
C. rake db:migrate
D. database_drop
15: How would you declare an Instance Variable?
A. @@
B. @
16: Ruby uses:
A. null
B. nil
17: What command do you run to update your database?
A. database_update
B. rake db:migrate
C. rails update
D. rake db:rollback
18: Migrations...
A. generally affect only views and sometimes controllers.
B. can never be reversed.
C. back up a project by copying it to another location.
D. are considered poor programming and are not used significantly in Rails.
E. modify a database by adding or removing columns or tables.
19: What is the preferred method of validating that the name has been set?
A. validates :name, :presence => true
B. save!
C. before_save if name != nil return true end return false end
D. validates :name => not_null
A. "/monster"
B. "#{monster}"
C. {monster}
D. "{monster}"
A. foo*2
B. foofoo
C. Gives an Error
D. foo
22: What ORM does Ruby on Rails use by default?
A. ActiveRails
B. ActiveSupport
C. SQL
D. MySQL
E. ActiveRecord
23: What is a typical file extension found in the app/controllers directory
A. .yml
B. .erb
C. .rb
D. .html.erb
24: Which of these is not a standard directory in a Rails application?
A. db
B. lib
C. app
D. All of these are standard directories
E. config
A. app/assets/javascripts
B. app/javascripts
C. assets/javascripts
D. public/javascripts
A. db/default_data.rb
B. db/migrate/inital_load.rb
C. db/migrate/default_data.rb
D. db/seeds.rb
27: What is the default value for a global variable (before initialization)?
A. null
B. nil
C. 0
D. nul
28: is it possible to change the default port when running a rails server ?
A. yes
B. no
29: Which of the following prints the "Hello WORLD!" output with a new line?
A. puts "Hello WORLD!"
B. print "Hello WORLD!"
C. disp( "Hello WORLD!" )
30: How do you create a new user object with the name david and save it to the database?
A. User.build(:name => 'david')
B. User.create(:name => 'david')
C. User.new(:name => 'david')
D. User.make(:name => 'david')
31: Which of these does NOT correctly return the version of Ruby?
A. -VERSION
B. --version
C. -v
32: If you want the /person url to map to your dog controller and show method, what do you add to your routes?
A. match '/person', :to => 'dog#show'
B. map.resources :person
C. map.resources :dog
D. map.resources :person => :dog
A. To find the value of a variable
B. To find the memory allocated to that variable
C. To determine if the variable is defined at the current scope
D. To find whether it is a constant or variable
34: Which of these javascript frameworks became the default with the release of Rails 3.1?
A. rails.js
B. jQuery
C. rails-script
D. Prototype
35: What is the use of @ in Ruby?
A. instance variable
B. class variable
36: Imagine that you have two models: "User" and "Book", and a user can have only one book. How should the association look like in the "User" model?
A. belongs_to :book
B. has_many: books
C. has_one :books
D. has_one :book
37: What file will rails look for given the following erb: <%= render 'some_partial' %>?
A. +some_partial.html.erb
B. some_partial.html.erb
C. @some_partial.html.erb
D. partial_some_partial.html.erb
E. _some_partial.html.erb
38: Determine the value of the variable x after the execution of the following code. x = [1,2,3] x.pop until x.empty? x.push(4) while x.empty?
A. [1,2,3]
B. [4]
C. [1]
D. [1,2,3,4]
39: If you want to append an item to an array, what is the standard method?
A. arr.length = arr.length+1 arr[length-1] = item
B. arr << item
C. arr.map(item.clone)
D. arr.append(item)
40: which one is class method?
A. class A def a end end
B. class A def self.a end end
41: Which is NOT a model validation method?
A. validates_numericality_of
B. validates_length_of
C. validates_form_of
D. validates_presence_of
E. validates_uniqueness_of
42: What part of a migration runs during a rollback?
A. nothing
B. The entire migration
C. self.down
D. self.up
43: Which of the following is a working ruby while-loop?
A. while i < 100 do # DO THINGS i += 1
B. while i < 100: # DO THINGS i += 1 end
C. while i < 100 do # DO THINGS i += 1 end
44: A module cannot be subclassed or instantiated.
A. True
B. False
45: Where will routes.rb file appear?
A. app/routes.rb
B. db/routes.rb
C. config/routes.rb
D. app/config/routes.rb
46: If you want the standard restful routes for your person controller, how do you add that?
A. resources :person do member do post :short end collection do get :long end end
B. response.map{|person| => :restful}
C. resources :people
D. map.person => {:get, :post, :put}
47: What is the difference between Symbol and String?
A. symbols, belongs to the category of immutable
B. string, belongs to the category of immutable
48: belongs_to: Represents the inverse of a has_one (or has_many) association.
A. true
B. false
49: What is the most elegant way to include a javascript file needed for only one page?
A. Application.layout.Javascripts <<
B.
C. <%= javascript_include_tag
D. :render => {:javascript => 'FILE NEEDED'}
50: Which is NOT a Ruby operator?
A. ||
B. <=
C. &&
D. =!
E. !=
List of Ruby on Rails MCQs Mul...
Available in:
Ruby on Rails MCQs
Ruby on Rails Множественного выбора вопросы
Preguntas de opción múltiple sobre Ruby on Rails
Ruby on RailsのMCQ（Multiple Choice Questions）
Domande a risposta multipla (MCQ) su Ruby on Rails
Questions à choix multiples (MCQ) sur Ruby on Rails
Perguntas de Múltipla Escolha (MCQ) sobre Ruby on Rails
Ruby on Rails Multiple-Choice-Fragen (MCQs)
Ruby on Rails 多项选择题 (MCQs)
أسئلة اختيارات متعددة في تطوير Ruby on Rails
Pertanyaan Pilihan Ganda Ruby on Rails
Ruby on Rails Çoktan Seçmeli Sorular
