React JS Online Quiz, React JS MCQ Quiz & Online Test

1 .

What port is the default where the webpack-dev-server will run?

A)

3000

B)

3306

C)

8080

D)

None of the above

Correct Answer : Option (C) : 8080

2 .

In React what is used to pass data to a component from outside?

A)

setState

B)

props

C)

PropTypes

D)

render with arguments

Correct Answer : Option (B) : props

Explanation : Props are used to pass data to a component from outside

3 .

What is a react.js in MVC?

A)

Model

B)

Controller

C)

Router

D)

Middleware

Correct Answer : Option (B) : Controller

4 .

ReactJS uses _____ to increase performance

A)

Virtual DOM

B)

Original DOM

C)

Both 1 & 2

D)

None of the above

Correct Answer : Option (A) : Virtual DOM

5 .

Keys are given to a list of elements in react. These keys should be -

A)

Unique in the DOM

B)

Do not requires to be unique

C)

Unique among the siblings only

D)

All of the above

Correct Answer : Option (C) : Unique among the siblings only

6 .

Which of the following is the correct data flow sequence of flux concept?

A)

Dispatcher->Action->Store->View

B)

Action->Dispatcher->Store->View

C)

Action->Dispatcher->View->Store

D)

Action->Store->Dispatcher->View

Correct Answer : Option (B) : Action->Dispatcher->Store->View

7 .

What is the name of React.js Developer ?

A)

Tim Lee

B)

Jordan Lee

C)

Jordan mike

D)

Jordan Walke

Correct Answer : Option (D) : Jordan Walke

8 .

Who Develop React.js?

A)

Google

B)

Apple

C)

Facebook

D)

Twitter

Correct Answer : Option (C) : Facebook

9 .

.............. helps react for keeping their data unidirectional

A)

JSX

B)

Flux

C)

Dom

D)

Props

Correct Answer : Option (B) : Flux

10 .

At the highest level, React components have lifecycle events that fall into

A)

Initialization

B)

State/Property Updates

C)

Destruction

D)

All of these

Correct Answer : Option (D) : All of these