JavaScript Certification Quiz

Which keyword is used for debugging in JavaScript?

• warn

• error

• debugger

• log

What is the purpose of the 'typeof' operator in JavaScript?

• To concatenate two strings

• To check if a variable is defined

• To determine the data type of a variable or constant

• To convert a string to a number

Which operator is used for exponentiation in JavaScript?

• ^

• **

• *

• /

What will be the output of the following code snippet?

• 6.28

• 6

• 3.14

• NaN

Which method is used to add a new element to the end of an array in JavaScript?

• append

• insert

• push

• add

What is the purpose of the 'Math.random()' function in JavaScript?

• To generate a random number between 0 and 1

• To find the square root of a number

• To calculate the absolute value of a number

• To round a number to the nearest integer

Which event is triggered when a user clicks on an HTML element?

• onhover

• onmove

• onclick

• onpress

What does the 'onsubmit' event represent in HTML forms?

• Event when the form is focused

• Event when the form is submitted

• Event when the form is reset

• Event when the form is loaded

How can you handle exceptions in JavaScript?

• catch/throw

• try/except

• try/catch

• throw/finally

Which method is used to locate an HTML element by its ID in JavaScript?

• getElementByName

• getElementById

• getElementByClass

• getElementByTag