Multiple Choice Questions
var x = 4; var y = 9; var z = x < y; What value is stored in the variable z above?
Which alert message(s) will be displayed when the following code runs? var num = 42; if(num <= 30) { document.write("Alert message #1"); } else{ document.write("Alert message #2"); }
var x = 25; var y = 12; var z = x < y;What value is stored in the variable z above?
A ________ is a container that can store a value in your program that can be accessed or modified at a later point.
Which of these is a JavaScript array?
Consider the following code: var x = 2; var y = 6; var z = -3; Which of the following line of code will update the stored value of the variable y to 3?
typeof "Hello, world"
Which alert message(s) will be displayed when the following code runs? var num = 35; if(num <= 30) { document.write("Alert message #1"); } else{ document.write("Alert message #2"); }
What belongs immediately after the if keyword in an if statement, within the parentheses? if ( )
Which JavaScript statement creates a new list item element and stores it in a new variable named listItem.
Which statement retrieves the element "d" from the array myArray? var myArray = ["a", "b", "c", "d", "e"];
Consider the following code: var book = { title: "Romeo and Juliet", authorFirstName: "William", authorLastName: "Shakespeare", publishDate: 1597 }; What line of code logs the value of the title property to the console?
Which of the following statements stores a value returned from a function?
Which JavaScript statement creates a new list item element and stores it in a new variable named listItem?
Which of the following statements changes the href attribute of an element to "www.microsoft.com"?
typeof "-34.7"
Which of the following are used to create a variable and assign it a value?
Consider the following code: var x = 2; var y = 6; var z = -3; What is the datatype of the variable **z**?
Which of the following statements defines a function named increment that returns a value and defines a parameter?
Which of the following statement would return a collection of elements that have the class "special"?
JavaScript was created by Google in 2005 for the Gmail application that needed more interactivity
Consider the following code: var book = { title: "Romeo and Juliet", authorFirstName: "William", authorLastName: "Shakespeare", publishDate: 1597 }; The code above creates a(n) ________ with the identifier book.
What is an infinite loop?
Consider the code: var greeting = "Hello"; var contact = { firstName: "Jane", lastName: "Doe", age: 35 }; What line of code update the greeting variable to store the value "Hello Jane"?
Which message will be displayed on the document when the following code is executed? var num = 24; if(num > 82) { document.write("zone 1"); } else if(num >= 43) { document.write("zone 2"); } else{ document.write("zone 3"); }
A JavaScript script will always be executed after the HTML page finishes loading.
JavaScript code is case sensitive.
Which of the following for-loop declarations creates a loop that will execute 4 times?
Assume that a variable has been declared and initialized with the following statement: var count = 4;Which of the following statements updates the variable with the value 24?
A JavaScript variable that originally stored a number can later store a string value.
Consider the following object: var book = { title: "Romeo and Juliet", author: "William Shakespeare", publishDate: 1597 }; Considering the book object above, which line of code will write the publish date of the book object to the browser console?
In JavaScript, in order to change the content of an HTML document or the CSS style of HTML elements, we use:
Which of the following statement sets a function called myHandler to be called when myButton is clicked?
Which JavaScript statement uses the document object to get a list of all of the h1 elements on a page and stores the collection in a variable named headings.
Which of the following statements invokes a function named myFunction that has no parameters?
A(n) ________ can hold a collection of named values, known as properties.
In order to write JavaScript code that is embedded in an HTML file, your JavaScript code belongs ________.
Which of the following statements declares a variable named score?
JavaScript can only run in a browser (It cannot run in other environments).
var mySection = document.getElementById("mySection"); var special = mySection.getElementsByClassName("special");What will the variable special contain after this code is executed?
var x = 34; var y = 10; var z = x%y;What value is stored in the variable z after the following lines of code are executed?
Which of the following statements declares a (non-global) variable named myNum and assigns it a value of 24?
Which statement creates an array named colors and stores 4 elements?
Which of the following lines of code produces the value "William Shakespeare"?
typeof "390" What is the result of the this statement?
What is the primary role of JavaScript?
Which line of code creates a variable named language that holds that value "JavaScript"?
var x = 4; var y = 9; var z = x < y; What is the data type of the variable z above?
Which statement retrieves the element with the value 32 from the array numbers? var numbers = [1, 3, 12, 42, 32, 4];
JavaScript is a(n) ________.
Which message will be displayed on the document when the following code is executed? var x = 3; var y = 8; if(x % 2 == 1 && y > 6) { document.write("This test passed" ); }else{ document.write("This test failed"); }
What is the result of the following statement? typeof 340.2
What causes a loop to be infinite?
Which of the following statements declares a variable named highScore?
Which of the following can be used to modify the text within a paragraph?
JavaScript allows you to develop webpages that are ________. This means the webpage's content changes based on conditions and interactions.
Which message will be displayed on the document when the following code is executed? var x = 3; var y = 8; if(x < 5 && y > 6) { document.write("This test passed"); } else{ document.write("This test failed"); }
Which of the following does not output information to the user via the webpage?
Which of the following statements calls a function, giveMeANumber, and passes the number 4 as a parameter?
What will the value of x be when the following while loop stops executing? var x = 4; while(x > 0) { alert("Hello "); x--; }
var language = "JavaScript"; The data type of the language variable above is:
What output will be displayed on the document when the following loop completes? for(x = 0; x < 4; x++){ document.write(x + " "); }
Consider the variable: var greeting = "Hello"; greeting += "John";What value is stored in the greeting variable after the 2nd line of code?
What value is stored in the variable x after the following lines of code are executed? var x = 9; var y = 3; var z = x%y;
typeof -34.7
var myVar = "23"; What is the data type of the variable myVar?
Which of the following statements invokes a function named myFunction that accepts a numeric parameter?
Consider the following object: var book = { title: "Romeo and Juliet", author: "William Shakespeare", publishDate: 1597 }; Considering the book object above, author is a ________ of the book object.
A complete line of JavaScript code that can be executed by the computer is called a(n) ________.
Which of the following keywords is used to define a function?
var x = 25; var y = 12; var z = x < y;What is the data type of the variable z above?
How can a function return a value?
Which of the following statements changes the CSS background-color of an element to "green"?
What value is stored in the variable x after the following lines of code are executed? var x = 3; x*=2;
JavaScript statements end with ________.
Which message will be displayed on the document when the following code is executed? var num = 40; if(num > 60) { document.write("zone 1"); } else if(num > 25) { document.write("zone 2"); } else{ document.write("zone 3"); }