JavaScript Basics Quiz

What is the correct way to declare a variable in JavaScript using var?

• variable num = 10;

• var num = 10;

• int num = 10;

• let num = 10;

Which of the following is NOT a valid JavaScript variable name?

• var myVar;

• var _myVar;

• var 123var;

• var $myVar;

What is the correct syntax to assign a value to a variable?

• var x; x == 10;

• var x = 10;

• var x <- 10;

• x := 10;

What will be the output of the following code? var car = "Tesla"; console.log(car);

• Tesla

• undefined

• null

• car

Which of the following is a correct way to declare a variable in JavaScript?

• var 1name = "John";

• var name1 = "John";

• var #name = "John";

• var name-1 = "John";

What will be the output of the following code? var num; console.log(num);

• undefined

• null

• 0

• Error

What is the purpose of the var keyword in JavaScript?

• To declare a function

• To declare a variable

• To define a loop

• To print output

What is the result of the following statement? var x = "10"; var y = 10; console.log(x == y);

• true

• false

• NaN

• undefined

Which operator is used for assigning a value to a variable?

• =

• ==

• ===

• :=

What will be the output of "Hello".length?

• 4

• 5

• 6

• undefined