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JavaScript Arithmetic Operators Mocktest

Question - 20

Home
JavaScript
JavaScript Operators
JavaScript Arithmetic Operators
Mocktest

1.

Which of the following is a logical operator in JavaScript?

A). && B). || C). ! D). All of the above

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option D

Solution:

Logical operators in JavaScript include AND (&&), OR (||), and NOT (!).

2.

What is the result of the expression 5 + "5"?

A). 10 B). 55 C). 55 D). NaN

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option B

Solution:

In JavaScript, the + operator concatenates strings. Since one operand is a string, the number is converted to a string, resulting in "55".

3.

What does the typeof operator return for an array?

A). object B). array C). list D). collection

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

In JavaScript, arrays are a type of object, so typeof returns "object".

4.

Which operator is used to assign a value to a variable in JavaScript?

A). = B). == C). === D). =>

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

The assignment operator = is used to assign a value to a variable.

5.

What is the result of the expression 3 * "3"?

A). 9 B). 9 C). 33 D). NaN

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

In JavaScript, the * operator performs arithmetic multiplication, converting strings to numbers if necessary.

6.

Which of the following operators can be used to compare two values, including type comparison?

A). == B). = C). === D). !==

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option C

Solution:

The === operator checks for both value and type equality.

7.

What does the !! operator do to a value?

A). Negates the value B). Converts the value to its boolean equivalent C). Increments the value by 2 D). No effect

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option B

Solution:

The !! operator converts any value to its boolean equivalent by first negating it and then negating the result.

8.

What is the value of the expression null == undefined?

A). 1 B). 0 C). null D). undefined

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

In JavaScript, null and undefined are loosely equal (==), but not strictly equal (===).

9.

Which operator checks if two values are not equal and also checks for type?

A). != B). !== C). < D). >

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option B

Solution:

The !== operator checks both value and type inequality.

10.

What is the result of 10 % 3 in JavaScript?

A). 0 B). 1 C). 2 D). 3

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option B

Solution:

The % operator returns the remainder of the division of 10 by 3, which is 1.

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