JavaScript jQuery and JSON Week 1 Practice Quiz Answer

January 12, 2022August 29, 2023 by Niyander

In this article i am gone to share Coursera Course: JavaScript jQuery and JSON Week 1 Practice Quiz Answer with you..

Also visit this link: JavaScript jQuery and JSON Week 3 Practice Quiz Answer

Question 1)
Where does the following JavaScript code execute?

<p>One Paragraph</p> 
<script type="text/javascript">
document.write("<p>Hello World</p>")
</script> 
<p>Second Paragraph</p>

Question 2)
What happens when JavaScript runs the alert() function?

JavaScript pops up a dialog box and execution continues until the </alert> tag is encountered
JavaScript checks to see if there are any unprocessed events
JavaScript execution is paused and a dialog box pops up
A message is sent back to the PHP code to be logged on the server

Question 3)
Which of the following is not a way to include JavaScript in an HTML document?

Question 4)
In the following code, what does the “return false” accomplish?

<a href=”js-01.htm” onclick=”alert(‘Hi’); return false;”>Click Me</a>

It keeps the browser from following the href attribute when “Click Me” is clicked
It is necessary to insure that the onclick code is at least two lines of code
It suppresses the pop up dialog that asks “Are you sure you want to navigate away from this page?”
It sets the default for the alert() dialog box

Question 5)
What happens in a normal end-user’s browser when there is a JavaScript error?

JavaScript logs the error to the PHP error log
JavaScript skips the line in error and continues executing after the next semicolon (;)
Nothing except perhaps a small red error icon that is barely noticeable
JavaScript prints a traceback indicating the line in error

Question 6)
Where can a developer find which line in a web page of JavaScript file is causing a syntax error?

By looking at a file on the hard disk of the system where the browser is running
Do a “View Source” to see the HTML source code
In the developer console in the browser
In the PHP error log

Question 7)
What does the following JavaScript do?

console.log(“This is a message”);

Puts the message in the browser developer console and continues JavaScript execution
Puts the message in the PHP console log
Puts the message in the browser console and pauses JavaScript execution
Sends the message to console.log.com

Question 8)
Which of the following is not a valid comment in JavaScript?

Question 9)
Which of the following is not a valid JavaScript variable name?

Question 10)
What is the difference between strings with single quotes and double quotes in JavaScript?

There is no difference
Double quotes strings cannot be used in JavaScript
Single quoted strings do not treat n as a newline
Double quoted strings so variable substitution for variables that start with dollar sign ($)

Question 11)
What does the following JavaScript print out?

toys = [‘bat’, ‘ball’, ‘whistle’, ‘puzzle’, ‘doll’];
console.log(toys[1]);

Question 12)
What value ends up in the variable x when the JavaScript below is executed?

x = 27 % 2;

Question 13)
What is the meaning of the “triple equals” operator (===) in JavaScript?

Both sides of the triple equals operator are converted to boolean before comparison
Both sides of the triple equals operator are converted to integers before comparison
Both sides of the triple equals operator are converted to string before comparison
That the values being compared are the same without any type conversion

Question 14)
How do you indicate that a variable reference within a JavaScript function is a global (i.e. not local) variable?

Use the keyword “global” when declaring the variable outside the function
Use the keyword “global” to declare the variable in the function
Use the keyword “var” to declare the variable in the function
Nothing, simply declare the variable globally before the function definition in the code

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