quiz 1

Question 1: Which of the following is not a JavaScript data type?

• a) String

• b) Array

• c) Float

• d) Function

Question 2: What is the correct data type for the value "42"?

• a) Number

• b) String

• c) Boolean

• d) Undefined

Question 3: What will the following expression evaluate to?

typeof "Hello"

• a) "Number"

• d) "Undefined"

• c) "String"

• b) "Boolean"

Question 4: How do you declare a variable in JavaScript?

• d) const myVariable;

• c) let myVariable;

• b) variable myVariable;

• a) var myVariable;

Question 5: Which data type is used to store multiple values in a single variable?

• c) Boolean

• d) Array

• b) Number

• a) String

Question 6: What will the following expression evaluate to?

typeof true

• a) "String"

• d) "Undefined"

• c) "Boolean"

• b) "Number"

Question 7: How do you check if two variables have the same value and data type in JavaScript?

• a) Using the == operator

• b) Using the === operator

• c) Using the != operator

• d) Using the !== operator

Question 8: What is the correct way to access the length of an String called "myStr" in JavaScript?

• a) length(myStr)

• d) myStr.length()

• c) myStr.length

• b) myStr.size

Question 9: What will the following expression evaluate to?

typeof [1, 2, 3]

• a) "String"

• b) "Number"

• d) "Object"

• c) "Boolean"

Question 10: How do you create a single-line comment in JavaScript?

• a) // This is a comment

• c) /* This is a comment */

• b) <!-- This is a comment -->

• d) # This is a comment