What is the correct way to declare a JavaScript variable?
- a) variable myVar;
- b) var myVar;
- c) v myVar;
- d) let myVar;
Answer: b) var myVar;
What is the output of the following code?
console.log(5 + "2");
- a) 7
- b) 52
- c) NaN
- d) Error
Answer: b) 52
Which method is used to add an element to the end of an array?
- a) push()
- b) pop()
- c) shift()
- d) unshift()
Answer: a) push()
What does the typeof operator in JavaScript return?
- a) The data type of a variable
- b) The value of a variable
- c) The size of a variable
- d) The scope of a variable
Answer: a) The data type of a variable
How do you write a comment in JavaScript?
a) //This is a comment
b) !--This is a comment-->
c) /*This is a comment*/
d) #This is a commentAnswer: a) //This is a comment
What is the correct way to write a JavaScript array?
- a) [1, 2, 3, 4]
- b) {1, 2, 3, 4}
- c) (1, 2, 3, 4)
- d) <1, 2, 3, 4>
Answer: a) [1, 2, 3, 4]
How do you convert a string to an integer in JavaScript?
a) parseInt()
b) parseFloat()
c) toString()
d) toFixed()
Answer: a) parseInt()
Which operator is used to concatenate strings in JavaScript?
- a) +
- b) –
- c) *
- d) /
Answer: a) +
What is the scope of a variable declared with the let keyword?
- a) Block scope
- b) Global scope
- c) Local scope
- d) Function scope
Answer: a) Block scope
