w3schools JavaScript quiz, w3schools jQuery quiz, JSON
23. Look at the following selector: $(":disabled"). What does it select? All disabled input elements All hidden elements All elements containing the text "disabled" All elements that does not contain the text "disabled"
All disabled input elements
4. Look at the following selector: $("div"). What does it select? All div elements The first div element
All div elements
22. Which jQuery method is used to remove selected elements? Both methods can be used remove() detach()
Both methods can be used
5. Is jQuery a library for client scripting or server scripting? Client scripting Server scripting
Client scripting
15. What scripting language is jQuery written in? C# VBScript C++ JavaScript
JavaScript
20. Is jQuery a W3C standard? No Yes
No
2. jQuery uses CSS selectors to select elements? True False
True
Which of the following is not a valid way to parse JSON string? Select one: a. JSON.eval() b. jQuery.parseJSON() c. JSON.parse() d. eval()
a. JSON.eval()
What is the value of json in the following code? var obj = { fruit: `apple', toJSON: function () { return `orange'; } }; var json = JSON.stringify({x: obj}); Select one: a. {"x":"orange"} b. {"fruit":"orange"} c. {"x":"apple"} d. {"fruit":"apple"}
a. {"x":"orange"}
12. How does a FOR loop start? for i = 1 to 5 for (i = 0; i <= 5) for (i = 0; i <= 5; i++) for (i <= 5; i++)
for (i = 0; i <= 5; i++)
7. How do you create a function in JavaScript? function = myFunction() function myFunction() function:myFunction()
function myFunction()
10. Which jQuery method is used to hide selected elements? hidden() hide() display(none) visible(false)
hide()
1. Which of the following is correct? jQuery is a JavaScript Library jQuery is a JSON Library
jQuery is a JavaScript Library
12. Which jQuery method is used to perform an asynchronous HTTP request? jQuery.ajaxSetup() jQuery.ajaxAsync() jQuery.ajax()
jQuery.ajax()
13. What is the correct jQuery code for making all div elements 100 pixels high? $("div").height="100" $("div").height(100) $("div").yPos(100)
$("div").height(100)
7. The jQuery html() method works for both HTML and XML documents True False
False
25. Is JavaScript case-sensitive? No Yes
Yes
6. Is it possible to use jQuery together with AJAX? No Yes
Yes
Which statement about the reviver parameter in JSON.parse() is true? Select one: a. A function that will be called for every key and value at every level of the final result b. Used to reform generic objects into instances of pseudo-classes c. Each value will be replaced by the result of the reviver function d. All three statements are true
d. All three statements are true
Which statement about the space parameter in JSON.stringify() is false? Select one: a. It controls spacing in the resulting JSON string b. It is an optional parameter c. All three statements are false d. It removes whitespace
d. It removes whitespace
23. Which operator is used to assign a value to a variable? x = - *
=
4. What is the correct syntax for referring to an external script called "xxx.js"? <script name="xxx.js"> <script src="xxx.js"> <script href="xxx.js">
<script src="xxx.js">
19. JavaScript is the same as Java. True False
False
14. How to insert a comment that has more than one line? /*This comment has more than one line*/ //This comment has more than one line// <!--This comment has more than one line-->
/*This comment has more than one line*/
13. How can you add a comment in a JavaScript? 'This is a comment <!--This is a comment--> //This is a comment
//This is a comment
1. Inside which HTML element do we put the JavaScript? <scripting> <script> <js> <javascript>
<script>
16. How do you round the number 7.25, to the nearest integer? rnd(7.25) Math.rnd(7.25) Math.round(7.25) round(7.25)
Math.round(7.25)
True of False. The order of JSON objects is always preserved. Select one: a. False b. True
a. False
9. How to write an IF statement in JavaScript? if (i == 5) if i == 5 then if i = 5 if i = 5 then
if (i == 5)
18. What is the correct JavaScript syntax for opening a new window called "w2" ? w2 = window.open("http://www.w3schools.com"); w2 = window.new("http://www.w3schools.com");
w2 = window.open("http://www.w3schools.com");
6. How do you write "Hello World" in an alert box? alertBox("Hello World"); alert("Hello World"); msgBox("Hello World"); msg("Hello World");
alert("Hello World");
In modern websites what is the common usage for JSON? Select one: a. To store information locally. b. To store information remotely. c. To send and receive bits of data.
c. To send and receive bits of data.
3. Which sign does jQuery use as a shortcut for jQuery? the % sign the ? Sign the $ sign
the $ sign
18. Which jQuery method is used to switch between adding/removing one or more classes (for CSS) from selected elements? switch() switchClass() altClass() toggleClass()
toggleClass()
24. What will the following code return: Boolean(10 > 9) true false NaN
true
5. The external JavaScript file must contain the <script> tag. False True
False
What kind of format is JSON, and what does the acronym mean? Select one: a. A lightweight data-interchange format. JavaScript Object Notation. b. A lightweight database framework. JavaScript Object Notation. c. A lightweight data-interchange format. Java Objective Notion. d. A lightweight data-encoding framework. Java Omnipresent Notation.
a. A lightweight data-interchange format. JavaScript Object Notation.
11. How does a WHILE loop start? while (i <= 10; i++) while (i <= 10) while i = 1 to 10
while (i <= 10)
8. What is the correct jQuery code to set the background color of all p elements to red? $("p").style("background-color","red"); $("p").layout("background-color","red"); $("p").manipulate("background-color","red"); $("p").css("background-color","red");
$("p").css("background-color","red");
16. Which jQuery function is used to prevent code from running, before the document is finished loading? $(document).load() $(body).onload() $(document).ready()
$(document).ready()
9. With jQuery, look at the following selector: $("div.intro"). What does it select? All div elements with class="intro" The first div element with id="intro" All div elements with id="intro" The first div element with class="intro"
All div elements with class="intro"
19. Look at the following selector: $("div p"). What does it select? The first p element inside a div element All p elements inside a div element All div elements with a p element
All p elements inside a div element
3. Where is the correct place to insert a JavaScript? The <body> section Both the <head> section and the <body> section are correct The <head> section
Both the <head> section and the <body> section are correct
17. How do you find the number with the highest value of x and y? ceil(x, y) Math.max(x, y) Math.ceil(x, y) top(x, y)
Math.max(x, y)
25. The jQuery animate() method can be used to animate ANY CSS property? All properties except the shorthand properties Yes Only properties containing numeric values
Only properties containing numeric values
21. Look at the following selector: $("p#intro"). What does it select? The p element with id="intro" All p elements with class="intro"
The p element with id="intro"
14. Which statement is true? To use jQuery, you can refer to a hosted jQuery library at Google To use jQuery, you do not have to do anything. Most browsers (Internet Explorer, Chrome, Firefox and Opera) have the jQuery library built in the browser To use jQuery, you must buy the jQuery library at www.jquery.com
To use jQuery, you can refer to a hosted jQuery library at Google
Which is true about JSON namespacing? Select one: a. JSON doesn't have namespaces. Though every object is inherently a namespace. b. JSON namespaces can be accessed after parsing data. c. JSON namespaces can be accessed immediately after receiving data.
a. JSON doesn't have namespaces. Though every object is inherently a namespace.
Which of the following control characters cannot be used when writing a JSON string without escaping? Select one: a. / or { b. " or \ c. ; or : d. < or >
b. " or \
True or false? A disadvantage of JSON is that it requires the use of JavaScript. Select one: a. True, though JavaScript is readily available in today's browsers. b. False, JSON is language independent. c. False, JavaScript must be available although it is not necessary to use. d. True, though all browsers have JavaScript enabled.
b. False, JSON is language independent.
What is a JSONStringer used for? Select one: a. It is used to create number strings in JSON. b. It is used to quickly create JSON text. c. It is used to create JSON ordered pairs. d. It quickly converts JSON to Java strings.
b. It is used to quickly create JSON text.
Which of these is a benefit JSON has over XML? Select one: a. JSON is more forgiving of poor formatting b. JSON has less markup requirements and therefore is lighter than XML c. JSON does not need to be stored in a file to be sent remotely d. JSON can be written poorly and still be parsed
b. JSON has less markup requirements and therefore is lighter than XML
In what situation would you want to use XML over JSON? Select one: a. When JSON is not offered. b. You need message validation or you're using XSLT. c. Never, JSON is worlds better. d. When you need to use tags to structure your content.
b. You need message validation or you're using XSLT.
How does JSON handle numeric values that cannot be represented by a sequence of digits (like Infiniti and Nan)? Select one: a. They are stored as strings and then converted when parsed. b. They are stored fine but it's the parsers job to convert them to numeric values. c. They are not permitted.
c. They are not permitted.
Can you use a double quote inside a JSON string? Select one: a. No, you should use single quotes b. Yes, if you use the ascii code. c. Yes, if it is escaped like ( \" ) d. Yes, you can use it without any special treatment
c. Yes, if it is escaped like ( \" )
What is the value of json in the following code? var cars = []; cars[0] = `Ford'; cars[1] = `Toyota'; cars[2] = `BMW'; var json = JSON.stringify({x: cars}); Select one: a. {"x":{"Ford","Toyota","BMW"}} b. {"cars":["Ford","Toyota","BMW"]} c. {"x":["Ford","Toyota","BMW"]} d. {"x":[`Ford','Toyota','BMW']}
c. {"x":["Ford","Toyota","BMW"]}
11. Which jQuery method is used to set one or more style properties for selected elements? html() css() style()
css()
Which statement about the replacer parameter in JSON.stringify() is true? Select one: a. If null or omitted, all properties of the object are included in the resulting JSON string b. If an array, specifies the names of the properties in the object to include in the resulting JSON string c. If a function, transforms values and properties encountered while stringifying d. All three statements are true
d. All three statements are true
What function will convert a JavaScript object to a JSON string? Select one: a. JSON.text() b. JSON.toString() c. JSON.serialize() d. JSON.stringify()
d. JSON.stringify()
Which of these is supported as a JSON Value type? Select one: a. Infiniti b. NaN c. Undefined d. Null
d. Null
What types of values can you have in JSON key:value pairs? Select one: a. Arrays, Primitives, and Objects stored as strings b. Strings, Arrays, and Primitives c. Strings only d. Strings, Arrays, Primitives and Objects
d. Strings, Arrays, Primitives and Objects
2. What is the correct JavaScript syntax to change the content of the HTML element below? <p id="demo">This is a demonstration.</p> document.getElement("p").innerHTML = "Hello World!"; #demo.innerHTML = "Hello World!"; document.getElementByName("p").innerHTML = "Hello World!"; document.getElementById("demo").innerHTML = "Hello World!";
document.getElementById("demo").innerHTML = "Hello World!";
10. How to write an IF statement for executing some code if "i" is NOT equal to 5? if (i != 5) if (i <> 5) if i =! 5 then if i <> 5
if (i != 5)
8. How do you call a function named "myFunction"? myFunction() call function myFunction() call myFunction()
myFunction()
20. How can you detect the client's browser name? client.navName navigator.appName browser.name
navigator.appName
17. Which jQuery method should be used to deal with name conflicts? nameConflict() noNameConflict() conflict() noConflict()
noConflict()
21. Which event occurs when the user clicks on an HTML element? onclick onmouseover onmouseclick onchange
onclick
24. Which jQuery method returns the direct parent element of the selected element? parent() ancestors() parents() ancestor()
parent()
22. How do you declare a JavaScript variable? var carName; v carName; variable carName;
var carName;
15. What is the correct way to write a JavaScript array? var colors = (1:"red", 2:"green", 3:"blue") var colors = "red", "green", "blue" var colors = ["red", "green", "blue"] var colors = 1 = ("red"), 2 = ("green"), 3 = ("blue")
var colors = ["red", "green", "blue"]