[Dec-2024] 100% Actual Web-Development-Applications dumps Q&As with Explanations Verified & Correct Answers
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NEW QUESTION # 25
What is an advantage that a mobile has over a mobile app?
- A. It is fully functional offline.
- B. It is automatically available to all users
- C. It has full control of the user interface
- D. It is automatically awe to access all device capabilities
Answer: B
Explanation:
A mobile website has the advantage of being automatically available to all users without the need for installation. Users can access it through their web browsers on any device with internet connectivity.
* Accessibility: Mobile websites can be accessed by simply entering a URL in a web browser. There is no need to visit an app store and install an application.
* Cross-Platform Compatibility: Mobile websites are designed to work across various devices and platforms, ensuring a broader reach.
* Automatic Updates: Updates to mobile websites are immediately available to users without requiring them to download and install new versions.
References:
* MDN Web Docs on Responsive Web Design
* W3C Mobile Web Application Best Practices
NEW QUESTION # 26
Which attribute is related to moving the mouse pointer of an element?
- A. Onmouseover
- B. Onmouseout
- C. onmouseenter
- D. Onmouseup
Answer: A
Explanation:
The onmouseover attribute in HTML and JavaScript is used to execute a script when the mouse pointer is moved over an element.
* onmouseover Attribute: This event occurs when the mouse pointer is moved onto an element. It is commonly used to change styles or content of the element when the user interacts with it by hovering.
* Usage Example:
<p onmouseover="this.style.color='red'">Hover over this text to change its color to red.</p> In this example, the text color changes to red when the mouse pointer is moved over the paragraph.
References:
* MDN Web Docs on onmouseover
* W3C HTML Specification on Events
NEW QUESTION # 27
Given the following code:
What is the value of the variable data when the code runs?
- A. Undefined
- B. A single-character string
- C. An empty string
- D. Null
Answer: C
Explanation:
In JavaScript, assigning an empty pair of quotes to a variable creates an empty string.
* Variable Assignment:
* Given the code:
var data = "";
* The variable data is assigned an empty string.
* Explanation:
* Option A: Null is incorrect because the variable is assigned an empty string, not null.
* Option B: A single-character string is incorrect because the string is empty.
* Option C: Undefined is incorrect because the variable is assigned a value, even though it is an empty string.
* Option D: An empty string is correct because "" represents an empty string.
* References:
* MDN Web Docs - String
* W3Schools - JavaScript Strings
NEW QUESTION # 28
Given the following javaScript code:
Which code segment calls the method?
- A. Obj,sayHello;
- B. Window,sayhello();
Answer: A
Explanation:
To call the sayHello method in the given JavaScript object, you need to use the object's name followed by the method name with parentheses.
* Correct Method Call:
* Given the object definition:
var obj = {
sayHello: function() {
alert("Hello");
}
};
* To call the method sayHello on the object obj:
obj.sayHello();
* Explanation:
* Option A: Obj.sayHello; is incorrect syntax. The correct syntax is obj.sayHello();.
* Option B: Window.sayHello(); is incorrect because the method is defined in the obj object, not the window object.
* References:
* MDN Web Docs - Functions
* W3Schools - JavaScript Objects
NEW QUESTION # 29
Given the following HTML code:
And given the following CSS selector:
Which elements will the CSS be applied to?
- A. Any anchors (a element) followed by unordered lists (1:1 element)
- B. All anchors (a. dement) and elements inside unordered lists ful element)
- C. Any anchors (a. element) preceded by unordered lists (ul element)
- D. All anchors (a element) and elements preceded by an unordered list (ul element)
Answer: B
Explanation:
Given the CSS selector a, ul, it targets all anchor (<a>) elements and all unordered list (<ul>) elements independently. This means the CSS rule will be applied to each <a> and <ul> element in the HTML document.
* CSS Selector Analysis:
* a: This part of the selector targets all <a> elements in the document.
* ,: The comma is a selector separator, meaning that each part of the selector list is applied independently.
* ul: This part of the selector targets all <ul> elements in the document.
* Example:
* Given HTML:
<p>
<a href="http://example.com/link0">Link 0</a>
<a href="http://example.com/link1">Link 1</a>
</p>
<ul>
<li>Hello</li>
</ul>
<p>
<a href="http://example.com/link2">Link 2</a>
<a href="https://example.com/link3">Link 3</a>
</p>
<b>Sample</b>
* Given CSS:
a, ul {
color: red;
}
* Affected Elements: All <a> and <ul> elements will have the color set to red.
* References:
* MDN Web Docs - Comma combinator
* W3C CSS Selectors Level 3
NEW QUESTION # 30
Given the following HTML statement:
And the following style:
Which line of the changes the background color of the <div> tag when the width is between 600 pixels and
900 pixels or more than 1, 100 pixels?
- A.
- B.
- C.
- D.
Answer: D
Explanation:
The given HTML and CSS statements define a class named "example" and use media queries to change the background color of the <div> element based on the screen width. The correct CSS media query to change the background color of the <div> tag when the width is between 600 pixels and 900 pixels or more than 1100 pixels is:Copy code
@media screen and (max-width: 900px) and (min-width: 600px), (min-width: 1100px) { div.example { background: yellow;
}
}
* Understanding Media Queries:
* @media screen: Applies the styles only for screens.
* (max-width: 900px) and (min-width: 600px): Targets screen widths between 600 and 900 pixels.
* , (comma): Acts as an "or" operator in media queries.
* (min-width: 1100px): Targets screen widths greater than or equal to 1100 pixels.
* Option C Explanation:
* This option uses the correct media query syntax to apply the background color change when the screen width is between 600 and 900 pixels or when it is 1100 pixels or more.
References:
* MDN Web Docs on Media Queries
* W3C CSS Media Queries Level 4
The correct CSS media query based on the provided options is:
@media screen and (max-width: 900px) and (min-width: 600px), (min-width: 1100px) { div.example { background: yellow;
}
}
References for Media Queries:
* MDN Web Docs on Using Media Queries
* W3C CSS Media Queries Module Level 4
NEW QUESTION # 31
Given the following code:
What is occurring?
- A. JavaScript is using the DOM to make a style change.
- B. In-line CSS is styling the <h1> tag.
- C. An event handler is tracking keyboard strokes.
Answer: A
Explanation:
The given code snippet demonstrates how JavaScript can manipulate the DOM to change the style of an element.
* Code Analysis:
* Given the HTML:
<h1 id="id1">Blog Title</h1>
<button type="button" onclick="document.getElementById('id1').style.color = 'red'">Click Here</button>
* When the button is clicked, the JavaScript code within the onclick attribute changes the color of the h1 element to red.
* Explanation:
* Option A: An event handler tracking keyboard strokes is incorrect because the event handler is tracking a mouse click, not keyboard strokes.
* Option B: JavaScript is using the DOM to make a style change is correct because the onclick attribute contains JavaScript code that modifies the style of the h1 element.
* Option C: In-line CSS is styling the <h1> tag is incorrect because the style change is done via JavaScript, not inline CSS.
* References:
* MDN Web Docs - Document.getElementById()
* W3Schools - JavaScript HTML DOM
NEW QUESTION # 32
Given the following code:
What does the console display as output?
- A. 0
- B. 1
- C. 2
Answer: A
Explanation:
Given the code segment:
var a = "8";
var b = "6";
var c = a + b;
console.log(c);
This code concatenates two strings.
* Explanation:
* var a = "8";: Variable a is assigned the string "8".
* var b = "6";: Variable b is assigned the string "6".
* var c = a + b;: The + operator concatenates the two strings, resulting in "86".
* console.log(c);: Outputs the value of c to the console.
* Output:
* The console displays "86" because it concatenates the two string values.
* References:
* MDN Web Docs - String
* W3Schools - JavaScript String
NEW QUESTION # 33
Which method retrieves periods updates about the geographic location of a user:
- A. ClearWatch
- B. getCurrentPosition
- C. WatchPosition
- D. GetContext
Answer: C
Explanation:
The watchPosition method in the Geolocation API is used to get periodic updates about the geographic location of a user.
* watchPosition Method: This method calls the provided callback function with the user's current position as the device's location changes.
* Usage Example:
navigator.geolocation.watchPosition(function(position) {
console.log("Latitude: " + position.coords.latitude + ", Longitude: " + position.coords.longitude);
});
In this example, the watchPosition method continuously logs the user's latitude and longitude to the console as the position changes.
References:
* MDN Web Docs on watchPosition
* W3C Geolocation API Specification
NEW QUESTION # 34
What is the effect of using the in-line validation process during user input?
- A. Slower rate of form completion
- B. Larger number of errors created
- C. More successful form completion rates
- D. Increased computation on the server
Answer: C
Explanation:
Inline validation during user input provides immediate feedback to the user about the correctness of their input. This real-time feedback helps users correct mistakes as they go, leading to higher rates of successful form completion.
* Inline Validation: Inline validation refers to checking the validity of input data as it is entered, rather than waiting until the form is submitted. This helps users to receive immediate feedback and correct errors on the spot.
* Benefits:
* Immediate Feedback: Users can correct mistakes immediately, which helps reduce frustration and confusion.
* Increased Success Rates: By providing real-time feedback, users are more likely to complete the form correctly, resulting in higher completion rates.
* User Experience: Improves the overall user experience by making the process more interactive and user-friendly.
References:
* Nielsen Norman Group on Inline Validation
* MDN Web Docs on Constraint Validation
NEW QUESTION # 35
Which HTML5 attribute specifies where to send the form data for processing a form is submitted?
- A. Method
- B. Action
- C. Enctype
- D. Target
Answer: B
Explanation:
The action attribute in the <form> element specifies the URL where the form data should be sent for processing when the form is submitted.
* Action Attribute: This attribute defines the endpoint that will handle the submitted form data.
* Usage Example:
<form action="/submit-form" method="post">
<input type="text" name="username">
<input type="submit" value="Submit">
</form>
Here, the form data is sent to the /submit-form URL when submitted.
References:
* MDN Web Docs on <form> action attribute
* W3C HTML Specification on Forms
NEW QUESTION # 36
What allows a scripting language to manipulate elements on a web page?
- A. CSS
- B. HTML
- C. XML
- D. DOM
Answer: D
Explanation:
The Document Object Model (DOM) is an API for HTML and XML documents that defines the logical structure of documents and the way a document is accessed and manipulated.
* DOM Explanation:
* The DOM represents the page so that programs can change the document structure, style, and content.
* It provides a way for scripts to update the content, structure, and style of a document while it is being viewed.
* Explanation:
* Option A: CSS is incorrect because it is used for styling web pages.
* Option B: XML is incorrect because it is a markup language, not an API for manipulating web page elements.
* Option C: HTML is incorrect because it is the markup language used to create web pages, not an API for manipulation.
* Option D: DOM is correct because it allows a scripting language to manipulate elements on a web page.
* References:
* MDN Web Docs - DOM
* W3Schools - JavaScript HTML DOM
NEW QUESTION # 37
What is a characteristic of JavaScript code?
- A. It must be compiled lo work.
- B. It remains hidden from the user.
- C. It implements across browsers.
- D. It runs inside a web browser
Answer: D
Explanation:
JavaScript is a scripting language primarily used for creating and controlling dynamic website content. Here are some characteristics:
* Runs Inside a Web Browser: JavaScript code is executed in the web browser, making it possible to create interactive and dynamic web pages.
* Cross-Browser Compatibility: JavaScript is designed to be compatible across different web browsers.
* Interpreted Language: JavaScript is interpreted, meaning it does not need to be compiled before execution.
* Accessible to Users: JavaScript code is not hidden from the user; it can be viewed in the browser's developer tools.
References:
* MDN Web Docs on JavaScript
* W3C JavaScript Introduction
NEW QUESTION # 38
Which History API object is called when a browser window's document history changes?
- A. Window, open
- B. Window, location
- C. Window, onpopstate
- D. Window, name
Answer: C
Explanation:
The onpopstate event is triggered in the window object when the active history entry changes, such as when the user navigates to a different page using the back or forward buttons in the browser.
* History API and onpopstate:
* Event: window.onpopstate
* Description: This event is fired when the user navigates to a session history entry, i.e., when moving backwards or forwards in the browser history.
* Example:
window.onpopstate = function(event) {
console.log("location: " + document.location + ", state: " + JSON.stringify(event.state));
};
* Other Options:
* A. Window, location: location is an object containing information about the current URL.
* C. Window, name: name is a property to set or get the name of a window.
* D. Window, open: open is a method to open a new browser window or tab.
* References:
* MDN Web Docs - window.onpopstate
* W3Schools - JavaScript History API
NEW QUESTION # 39
What should a developer correct before revalidating after a code validator reports multiple errors in code?
- A. Only CSS errors
- B. The first reported error
- C. Only JavaScript errors
- D. The last reported error
Answer: B
Explanation:
When using a code validator to check your HTML, CSS, or JavaScript code, it's essential to address errors in a systematic manner. The correct approach is to correct the first reported error before revalidating. This method is recommended because often, the first error can cause a cascade of subsequent errors or warnings.
By fixing the first error, you may automatically resolve other errors that were reported later.
* Reasoning:
* Cascading Errors: The first error in the code might lead to multiple subsequent errors. Fixing it can sometimes resolve those cascading errors, reducing the overall number of errors in the next validation.
* Logical Flow: Addressing errors in the order they appear maintains a logical flow and makes debugging more manageable.
* Steps to Follow:
* Step 1: Run the code through the validator.
* Step 2: Identify the first reported error.
* Step 3: Correct the first error.
* Step 4: Revalidate the code to check if the error count has reduced or if new errors appear.
* Step 5: Repeat the process until all errors are resolved.
* References:
* W3C Markup Validation Service
* MDN Web Docs - Debugging HTML
* W3C CSS Validation Service
NEW QUESTION # 40
Which programming paradigm best describes JavaScript?
- A. Event-driven
- B. Object-oriented
- C. Object-based
- D. Function-driven
Answer: C
Explanation:
JavaScript is often described as an object-based language, meaning it is centered around objects. While it supports object-oriented programming (OOP) concepts, it is more accurate to describe it as object-based due to its prototypal inheritance model rather than classical inheritance.
* Object-Based: JavaScript is built around objects and supports the creation and manipulation of objects.
* Object-Oriented Features: JavaScript supports OOP principles like encapsulation, inheritance, and polymorphism, but through prototype chains rather than class-based inheritance.
* Functional and Event-Driven: JavaScript supports functional programming and is often used in an event-driven manner, particularly in the context of web browsers.
References:
* MDN Web Docs on JavaScript Object Model
* W3C JavaScript Overview
NEW QUESTION # 41
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