×

Home
Jobs
Courses
Certifications
Companies
Online IDE
Login
Signup

Adding Strings and Numbers Mocktest

Question - 20

Home
JavaScript
JavaScript Operators
Adding Strings and Numbers
Mocktest

11.

What is the result of 5 + null in JavaScript?

A). 5 B). null C). 0 D). '5'

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

In JavaScript, null is converted to 0 in numeric contexts, so 5 + null evaluates to 5.

12.

How does JavaScript handle the expression 5 + undefined?

A). Converts undefined to NaN and returns NaN B). Converts 5 to a string and concatenates C). Throws an error D). Converts 5 to undefined and returns undefined

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

Adding undefined to a number in JavaScript results in NaN, which stands for "Not a Number".

13.

What is the output of 5 + NaN in JavaScript?

A). NaN B). 5 C). '5NaN' D). 0

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

Any arithmetic operation with NaN in JavaScript results in NaN.

14.

How do you concatenate multiple strings and a number in JavaScript?

A). Using the + operator B). Using the concat() method C). Using the join() method D). Using the combine() method

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

The + operator is commonly used to concatenate strings in JavaScript.

15.

What will be the output of 5 + ' apples' + 3 in JavaScript?

A). '5 apples3' B). '8 apples' C). '53 apples' D). '5 apples + 3'

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

JavaScript evaluates the addition first (5 + 3 results in 8), then converts 8 to '8' and concatenates with ' apples', resulting in '8 apples'.

16.

What does '5' + undefined evaluate to in JavaScript?

A). '5undefined' B). undefined C). 'NaN' D). '5'

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

JavaScript converts undefined to the string 'undefined' and concatenates it with '5', resulting in '5undefined'.

17.

How do you convert a string to a number in JavaScript using the + operator?

C). *string D). /string

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

The unary + operator can be used to convert a string to a number in JavaScript.

18.

What is the result of '5' + '3' + 2 in JavaScript?

A). '532' B). '8' C). '5' D). '53'

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

JavaScript evaluates the addition first ('5' + '3' results in '53'), then concatenates '53' with '2', resulting in '532'.

19.

How do you add a number and a string in JavaScript to get a string result?

A). string + number.toString() B). string + number C). string + Number(number) D). number + string

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

JavaScript automatically converts the number to a string when using the + operator with a string.

20.

What will be the output of 'apple' + null in JavaScript?

A). 'applenull' B). 'apple' C). 'null' D). 'appl'

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

JavaScript converts null to the string 'null' and concatenates it with 'apple', resulting in 'applenull'.

Previous
1
2

COMPANY

About us
Careers
Contact Us
In Press
People
Companies List

Products

Features
Coding Assessments
Psychometric Assessment
Aptitude Assessments
Tech/Functional Assessments
Video Assessment
Fluency Assessment
Campus

Learning
Campus Recruitment
Lateral Recruitment
Enterprise
Education
K 12
Government

OTHERS

Blog
Terms of Services
Privacy Policy
Refund Policy
Mart Category

Partner

Partner Login
Partner Signup

Copyright © RVR Innovations LLP 2024 | All rights reserved - Mytat.co is the venture of RVR Innovations LLP