Deck 9: Getting Started With Javascript

Question 1

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

Answer 1

True

Question 2

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

Answer 2

False

Question 3

A variable requires an initial value to be defined.

Answer 3

False

Question 4

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

Question 5

JavaScript supports methodsto change the date stored within a Date object.

Question 6

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

Question 7

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

Question 8

JavaScript is case sensitive.

Question 9

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

Question 10

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

Question 11

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

Question 12

Parameters are treated as variables within a function.

Question 13

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

Question 14

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 15

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

Question 16

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

Question 17

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

Question 18

JavaScript comments can be entered on single or multiple lines.

Question 19

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

Question 20

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

Question 21

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 22

_____ is the programming language for client-side programs.

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

Question 23

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

A) ​F9
B) ​F12
C) ​F8
D) ​F10

Question 24

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 25

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

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

Question 26

_____ 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 27

_____ are intrinsic to the JavaScript language.

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

Question 28

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 29

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

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

Question 30

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 31

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

Question 32

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 33

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 34

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 35

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 36

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 37

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 38

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 39

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 40

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 41

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 42

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

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

Question 43

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

A) ​5
B) ​NaN
C) ​Infinity
D) ​A

Question 44

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

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

Question 45

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

A) ​56
B) ​48
C) ​28
D) ​96

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 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 48

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 49

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

A) ​math.constant
B) ​Math.CONSTANT
C) ​math.CONSTANT
D) ​Math.constant

Question 50

Identify a syntax for JavaScript function.

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

Question 51

Objects are organized into groups called _____.

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

Question 52

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 53

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 54

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 55

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 56

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 57

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 58

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 59

Identify a syntax to set the time-delayed commands.

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

Question 60

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 61

Document objects are organized in hierarchical structures called the _________.

Question 62

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

Question 63

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 64

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,
$\text { var this Day = new Date ("May 23, } 2018 \text { 14:35:05"); }$
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 65

When writing an HTML code,changing the value of the _________ property overwrites whatever content is currently contained within the selected object.

Question 66

A _________ is a JavaScript command that is run after a specified amount of time has passed.

Question 67

Identify the property that best matches the following style rules.

-It is indicated by the - - symbol,which reduces the operand's value by 1.

A) window.alert(" ");
B) value.toPrecision(n)
C) collection[idref]
D) element.outerHTML
E) document.anchors
F) element.textContent
G) Decrement operator
H) Run-time error
I) value.toFixed(n)
J) parseInt(string)

Question 68

Identify the property that best matches the following style rules.

-It is a command to create a dialog box containing a message.

A) window.alert(" ");
B) value.toPrecision(n)
C) collection[idref]
D) element.outerHTML
E) document.anchors
F) element.textContent
G) Decrement operator
H) Run-time error
I) value.toFixed(n)
J) parseInt(string)

Question 69

Identify the property that best matches the following style rules.

-It is an object collection in which all the elements are marked with the < a > tag.

A) window.alert(" ");
B) value.toPrecision(n)
C) collection[idref]
D) element.outerHTML
E) document.anchors
F) element.textContent
G) Decrement operator
H) Run-time error
I) value.toFixed(n)
J) parseInt(string)

Question 70

The _________ error occurs when a script is first loaded by a browser.

Question 71

The variables or expressions that operators act upon are called _________.

Question 72

The browser halts loading a script before trying to execute it if a(n)_________ is detected.

Question 73

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,
$\text { var this Day = new Date ("May 23, } 2018 \text { 14:35:05"); }$
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 74

JavaScript includes _________ in its time calculations due to which the seconds value in the countdown clock is off by a second.

Question 75

Identify the property that best matches the following style rules.

-It returns a text string displaying value to n significant digits either to the left or to the right of the decimal point.

A) window.alert(" ");
B) value.toPrecision(n)
C) collection[idref]
D) element.outerHTML
E) document.anchors
F) element.textContent
G) Decrement operator
H) Run-time error
I) value.toFixed(n)
J) parseInt(string)

Question 76

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 77

JavaScript dates are stored as numeric values equal to the number of _________ between the specified date and January 1,1970 at midnight.

Question 78

A(n)_________ is an entity within the browser or web page that has properties that define it and methods that can be acted upon it.

Question 79

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) ocation object
D) navigator object

Question 80

A(n)_________ can be created by omitting the src attribute and placing all of the JavaScript code within the script element so that an external file need not be used.