Deck 9: Getting Started With Javascript Tutorial

Question 1

In JavaScript, the clearTimeout() method is used to clear all repeated commands.

Answer 1

False

Question 2

Parameters are treated as variables within a function.

Answer 2

True

Question 3

Server-side and client-side programming are the two main types of web-based programming.

Answer 3

True

Question 4

The first character of a variable must be a numeral or an underscore character ( _ ).

Question 5

Any command that references a document object before the browser has parsed the HTML code will result in an error because those objects do not yet reside in memory.

Question 6

JavaScript demands strict application of rules for syntax and program structure.

Question 7

There is no limit to the number of time-delayed commands a browser can process.

Question 8

A logical error is the easiest to fix as the errors in the code can be traced easily.

Question 9

JavaScript supports methods to change the date stored within a Date object.

Question 10

JavaScript comments can be entered on single or multiple lines.

Question 11

The async attribute stalls script processing until after the page has been completely parsed and loaded.

Question 12

The script element can be placed anywhere within the HTML document.

Question 13

The Math.round(x) method rounds the value of x down to the next lowest integer.

Question 14

An Infinity value is generated for an operation whose result is less than the smallest numeric value.

Question 15

An object can be modified by changing its properties or by applying a method.

Question 16

JavaScript is case sensitive.

Question 17

A variable requires an initial value to be defined.

Question 18

If no value is assigned to a Boolean variable, it is interpreted as having a value of true .

Question 19

Both HTML tags and text content can be returned by the innerHTML property.

Question 20

JavaScript is a procedural language that needs a compiler to translate the code into machine language.

Question 21

To break a text string into several lines, which means that the text string continues on the next line, the _____ character should be used.

A) forward slash
B) backslash
C) colon
D) semicolon

Question 22

Identify a statement that is added to the first line of the file to run a script in strict mode.

A) "use strict";
B) "mode strict";
C) use: strict
D) mode: strict

Question 23

JavaScript code is attached to an HTML file using the _____ element.

A) label
B) java
C) script
D) attach

Question 24

A command that indicates an action for the browser to take should end with a _____.

A) semicolon
B) backslash
C) colon
D) forward slash

Question 25

_____ is the programming language for client-side programs.

A) Perl
B) JavaScript
C) C#
D) PHP

Question 26

Developers advocate that JavaScript be run in _____ in which all lapses in syntax result in load-time or run-time errors.

A) protect mode
B) private mode
C) safe mode
D) strict mode

Question 27

The isNaN(value) function returns a Boolean value of true if the value is not numeric.

Question 28

A _____ occurs after a script has been successfully loaded with no syntax errors and is being executed by a browser.

A) load-time error
B) run-time error
C) logical error
D) fatal error

Question 29

_____ is the process of locating and fixing a programming error.

A) Scripting
B) Buffering
C) Debugging
D) Booting

Question 30

The technique for locating the source of an error is to set up _____ , which are locations where the browser will pause the program, allowing the programmer to determine the error at that position.

A) breakpoints
B) thresholds
C) blocks
D) lapses

Question 31

Which of the following is created by a programmer for use in an application.

A) Built-in objects
B) Browser objects
C) Document objects
D) Customized objects

Question 32

Identify a shortcut key on the keyboard to open the debugging tools.

A) F9
B) F12
C) F8
D) F10

Question 33

To avoid fatal errors, it is advised to apply the _____ statement locally only to functions that are created rather than globally as the first line of the script file.

A) "use strict";
B) "use local";
C) "use global";
D) "use moderate";

Question 34

JavaScript is used as a programming tool for:

A) managing databases.
B) designing style sheets for websites.
C) creating interactive web forms and animated graphics.
D) providing virtual reality, diagnosis, and nonlinear controls.

Question 35

A user can create an embedded script by removing the _____ attribute and placing all of the JavaScript code within the script element.

A) method
B) src
C) enctype
D) id

Question 36

Identify a command that displays a dialog box containing the message "Hello World!".

A) Window.alert("Hello World!");
B) Window.Alert("Hello World!");
C) window.alert("Hello World!");
D) window.Alert("Hello World!");

Question 37

A video embedded on a web page is a(n) _____ and has properties such as source of the video file or the width and height of the video player.

A) class
B) method
C) object
D) event

Question 38

_____ are intrinsic to the JavaScript language.

A) Built-in objects
B) Event-driven objects
C) Browser objects
D) Customized objects

Question 39

The _____ attribute tells a browser to parse the HTML and JavaScript code together, only pausing to process the script before returning to the HTML file.

A) async
B) defer
C) src
D) type

Question 40

_____ programming distributes the load to prevent a server from getting overloaded with program-related requests.

A) Client-side
B) Server-side
C) Inductive
D) Semantic

Question 41

Objects are organized into groups called _____.

A) object collections
B) object pools
C) object buckets
D) object topologies

Question 42

Identify an expression that can be used to refer an element by its id attribute.

A) document.getElementById( id )
B) Document.getElementbyID( id)
C) document.getelementById( id )
D) Document.getelementByID( id )

Question 43

Identify a return value for the expression 5/"A" using JavaScript.

A) 5
B) NaN
C) Infinity
D) A

Question 44

Which of the following can be referenced only after the browser has finished parsing the page content?

A) Built-in objects
B) Browser objects
C) Document objects
D) Customized objects

Question 45

Identify a property used to refer an HTML code that is stored within a page element.

A) element.innerHTML
B) element.textContent
C) element.offsetTop
D) element.insertAdjacentHTML

Question 46

Which of the following syntax is used for a function to return a value?

A) return value; function_name(parameters){ commands }
B) function return value; { function_name(parameters) commands }
C) function function_name(parameters){ commands return value;}
D) function_name(parameters) { return value; commands }

Question 47

Identify the output of the following code. var x = 8; var y = 6;

A) 56
B) 48
C) 28
D) 96

Question 48

Identify a method that repeatedly runs commands at specified time breaks in a function created.

A) setInterval("command", interval)
B) setTimeout("command", interval)
C) setTimeout(interval, delay)
D) setInterval(interval, delay)

Question 49

Identify an expression used to apply a method to an object.

A) object.object(method)
B) Object.name(method)
C) object.method(values)
D) Object.name(values)

Question 50

Which of the following methods of the Math operator rounds x up to the next highest integer?

A) Math.round(x)
B) Math.ceil(x)
C) Math.rand(x)
D) Math.floor(x)

Question 51

Identify a command that uses the dateDiv variable to refer the page element with ID dateNow.

A) var dateDiv = document.getElementById("dateNow");
B) var dateNow = document.getElementById(dateDiv),
C) var dateNow = document.getElementById("dateDiv");
D) var dateDiv = document.getElementById(dateNow),

Question 52

Identify an expression that defines a date object.

A) new Date("month, day, year hrs:mins:secs");
B) new Date("month day, year" "hrs:mins:secs");
C) new Date("month day, year hrs:mins:secs");
D) new Date("month, day, year" hrs:mins:secs);

Question 53

Identify a syntax to set the time-delayed commands.

A) SettimeOut(delay);
B) Setinterval(interval);
C) setTimeout("command", delay);
D) setInterval("command", interval);

Question 54

The _____ property should be used only when no markup tags are involved.

A) innerHTML
B) outerHTML
C) textContent
D) insertAdjacentHTML

Question 55

A(n) _____ is a named item in a program that stores a data value, such as a number or text string, or an object, such as a part of the web browser or browser window.

A) variable
B) entity
C) constant
D) class

Question 56

The _____ attribute can be applied to the script element to ensure that an object can be referenced within a JavaScript program that runs only after the page has completed loading.

A) async
B) defer
C) charset
D) type

Question 57

A(n) _____ is any group of characters enclosed within either double or single quotation marks in JavaScript.

A) entity
B) text string
C) null value
D) object

Question 58

Identify a syntax to access any of the mathematical constants supported by the Math object.

A) math.constant
B) Math.CONSTANT
C) m ath.CONSTANT
D) Math.constant

Question 59

Identify a syntax for JavaScript function.

A) function_name function ( parameters ){ commands }
B) Function_name function ( commands ){ parameters }
C) function function_name ( parameters ){ commands }
D) Function function_name ( commands ){ parameters }

Question 60

A(n) _____ is a collection of commands that performs an action or returns a value.

A) function
B) argument
C) entity
D) pointer

Question 63

Case-Based Critical Thinking Questions Case 9-2 Robin maintains a web page for updating the metro timings in the city. He would like the website to display the present day's schedule. To do this, Robin writes a code that includes an object to retrieve the day of the week and then loads the appropriate data into the page. Robin includes an expression to the code, var thisDay = new Date("May 23, 2018 14:35:05"); Identify the value for the month that will be displayed on the web page by using thisDay.getMonth() method.

A) 35
B) 4
C) 14
D) 3

Question 64

Identify a function that extracts the first numeric value from the text string .

A) parseInt(string)
B) parseFloat(string)
C) isFinite(value)
D) isNaN(value)

Question 65

Case-Based Critical Thinking Questions Case 9-1 Terin has created a page for a training institute that will allow users to browse the training courses provided at the institute. Terin uses JavaScript to write the content using objects and functions. The objects defined in the code are document object, history object, screen object, navigator object, and the location object. Identify an object created by Terin that will contain information about the current URL.

A) history object
B) screen object
C) location object
D) navigator object

Question 66

Case-Based Critical Thinking Questions Case 9-2 Robin maintains a web page for updating the metro timings in the city. He would like the website to display the present day's schedule. To do this, Robin writes a code that includes an object to retrieve the day of the week and then loads the appropriate data into the page. Identify an expression that Robin must use to define the current date on the web page.

A) new Date(year, month, day, hrs, mins, secs);
B) new date("hrs", "mins", "secs", "day", "month", "year");
C) this.day( hrs, mins, secs, year, month, day ),
D) this Day("day", "month", "hrs", "mins", "secs", "year"),

Question 68

Explain briefly about converting between numbers and text.

Question 69

Case-Based Critical Thinking Questions Case 9-2 Robin maintains a web page for updating the metro timings in the city. He would like the website to display the present day's schedule. To do this, Robin writes a code that includes an object to retrieve the day of the week and then loads the appropriate data into the page. Robin includes an expression to the code, var thisDay = new Date("May 23, 2018 14:35:05"); He also includes the method thisDay.getDay() in the code. What is the result for the given method?

A) 1
B) 3
C) 4
D) 5

Question 70

Explain the syntax rules that must be maintained when writing JavaScript commands.

Question 71

Explain the syntax to reference objects in JavaScript.

Question 72

Case-Based Critical Thinking Questions Case 9-1 Terin has created a page for a training institute that will allow users to browse the training courses provided at the institute. Terin uses JavaScript to write the content using objects and functions. The objects defined in the code are document object, history object, screen object, navigator object, and the location object. Terin wants to create an object that will contain information about the browser application. Which of the following objects must Terin create to accomplish this?

A) navigator object
B) location object
C) history object
D) document object