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Adding Strings and Numbers Mocktest

Question - 20

Home
JavaScript
JavaScript Operators
Adding Strings and Numbers
Mocktest

1.

What is the result of 5 + 3 in JavaScript?

A). 8 B). 53 C). '8' D). 15

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

The + operator in JavaScript performs addition when used with numbers.

2.

What does '5' + '3' evaluate to in JavaScript?

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

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

When both operands of the + operator are strings, JavaScript concatenates them.

3.

How does JavaScript handle the expression 5 + '3'?

A). Converts 5 to a string and concatenates B). Converts '3' to a number and adds C). Throws an error D). Converts '5' to a number and adds

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

JavaScript automatically converts the number 5 to the string '5' and concatenates it with '3', resulting in '53'.

4.

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

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

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'.

5.

How do you concatenate two strings in JavaScript?

A). string1.concat(string2) B). string1 + string2 C). string1.join(string2) D). string1.combine(string2)

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option B

Solution:

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

6.

What does '5' + 3 evaluate to in JavaScript?

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

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

JavaScript converts the number 3 to the string '3' and concatenates it with '5', resulting in '53'.

7.

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

A). parseInt(string, 10) + number B). Number(string) + number C). string + number D). number + string

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option B

Solution:

Number(string) converts the string to a number, allowing for numeric addition with number.

8.

What is the result of '5' + true in JavaScript?

A). '5true' B). '6' C). 6 D). 'true5'

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

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

9.

How do you convert a string to a number in JavaScript before adding it to another number?

A). Number(string) B). parseInt(string, 10) C). string.toNumber() D). string.convertToNumber()

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

Number(string) is the preferred method to convert a string to a number in JavaScript.

10.

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

A). 'apple5' B). 10 C). 'apple10' D). '5apple'

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

JavaScript converts the number 5 to the string '5' and concatenates it with 'apple', resulting in 'apple5'.

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