React Questions

March 16, 2023

Deprecated: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-content/plugins/quiz-maker/public/class-quiz-maker-public.php on line 1335

Deprecated: Implicit conversion from float 0.16666666666666666 to int loses precision in /home/u797631661/domains/codermantra.com/public_html/wp-content/plugins/quiz-maker/includes/class-quiz-maker-data.php on line 1008

Deprecated: Implicit conversion from float 0.16666666666666666 to int loses precision in /home/u797631661/domains/codermantra.com/public_html/wp-content/plugins/quiz-maker/includes/class-quiz-maker-data.php on line 1008

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

0 votes, 0 avg

React Questions

1 / 15

1. Which is not true about Virtual DOM in React JS?

A. can not directly update HTML

B. It uodates faster

C. Dom manipulation is very easy

D. too much memory wastage

2 / 15

2. How can you access the state of a component from inside of a member function?

A. this.state

B. this.values

C. this.getState()

D. this.prototype.stateValue

3 / 15

3. Which of the following function is used to change the state of the React.js component?

A. this.setState

B. this.setChangeState

C. this.State{}

D. this.useState

4 / 15

4. What is the children prop?

A. A property that lets you pass data to child components

B. A property that lets you set an object as a property

C. A property that lets you nest components in other components

D. A property that adds child values to state

5 / 15

5. What is React.js?

A. Open-source JavaScript back-end library

B. JavaScript front-end library to create a database

C. Free and open-source JavaScript front-end library

D. None of the mentioned

6 / 15

6. To get the first item from the array (“cooking”) using array destructuring, how do you adjust this line?const topics = [‘cooking’, ‘art’, ‘history’];

A. const first = ["cooking", "art", "history"]

B. const [] = ["cooking", "art", "history"]

C. const [, first]["cooking", "art", "history"]

D. const [first] = ["cooking", "art", "history"]

7 / 15

7. Which of the following is true about the below syntax ?disabled = {false}

A. rendered as disabled

B. rendered at all

C. rendered as enabled

D. none of these

8 / 15

8. What are the two ways to handle data in React?

A. Services & Components

B. State & Component

C. State & Props

D. State & Services

9 / 15

9. Find the bug in this code :

  function car({make, model}) {
  return < h1 > {make} {model} < /h1 > ;
};

A. Add parenthesis around the return value

B. Remove the return statement

C. Wrap the return in a fragment

D. The first letter of the function must be capitalized

10 / 15

10. Consider the following code from React Router. What do you call :id in the path prop? > Route path=”/:id” / >

A. This is a route modal

B. This is a route parameter

C. This is a route splitter

D. This is a route link

11 / 15

11. As soon as the state of react component is changed, component will

A. Does nothing,you have to call render method to render the component again

B. re-render the component

C. be created again from scratch

D. none of these

12 / 15

12. Arbitrary inputs of components in React are called

A. Kyes

B. Props

C. Elements

D. Ref

13 / 15

13. What is the output of the following code?

const make = 'Ford';
const model = 'Mustang';
const car = { make, model };
console.log(car);

A. {car: 'Ford', car: 'Mustang'}}

B. {{make: 'Ford', model: 'Mustang'}}

C. {make: 'Ford', model: 'Mustang'}

D. {car: {make: 'Ford', model: 'Mustang'}}

14 / 15

14. What is the output of the below code ?

var Geeks=(props)=>
{
 return(
 

DSA Course 1
 

 

DSA Course 2
 

 );
}
ReactDOM.render( < DSA Course/ > ,mountNode)

A. DSA Course 1

B. DSA Course 2

C. DSA Course 1 DSA Course 2

D. Error

15 / 15

15. Why React is faster then normal websites?

A. it does not use any DOM

B. It uses Original DOM

C. it uses Virtual DOM

D. none of these

Your score is

The average score is 41%

Questions, Quiz

CoderMantra

Questions

About CoderMantra

Latest Posts

Contact Us