Javascript_ Quiz 2 – Learning Portal

Which of the following is true about variable naming conventions in JavaScript?

You should not use any of the JavaScript reserved keyword as variable name.
JavaScript variable names should not start with a numeral (0-9).
Both of the above
None of the above

Which of the following is the correct syntax to create a cookie using JavaScript?

document.cookie = 'key1 = value1; key2 = value2; expires = date'
browser.cookie = 'key1 = value1; key2 = value2; expires = date'
window.cookie = 'key1 = value1; key2 = value2; expires = date'
navigator.cookie = 'key1 = value1; key2 = value2; expires = date'

Which of the following is correct about callbacks?

A callback is a plain JavaScript function passed to some method as an argument or option.
Some callbacks are just events, called to give the user a chance to react when a certain state is triggered.
Both of the above
None of the above

Which built-in method reverses the order of the elements of an array?

changeOrder(order)
reverse()
sort(order)
None of the above

Which of the following function of String object combines the text of two strings and returns a new string?

add()
merge()
concat()
append()

Which of the following function of String object returns the index within the calling String object of the last occurrence of the specified value?

lastIndexOf()
search()
substr()
indexOf()

Which of the following function of String object returns the calling string value converted to lower case?

toLocaleLowerCase()
toLowerCase()
toString()
substring()

Which of the following function of String object causes a string to be displayed in the specified size as if it were in a <font size = ‘size’> tag?

fixed()
fontcolor()
fontsize()
bold()

Which of the following function of Array object calls a function for each element in the array?

concat()
every()
filter()
forEach()

Which of the following function of Array object sorts the elements of an array?

toSource()
sort()
toString()
unshift()

What can we attach to DOM elements in order to respond to events in the system?

Event Handlers
Event Listeners
Event Processors
Event Coordinators

What method do we use to create an event listener?

element.makeEventListener()
element.listen()
element.on()
element.addEventListener()

The following example uses what type of function to handle an event?
element.addEventListener(‘click’, function(event){});

named function
anonymous function
inline function
arrow function

What property on the event object contains the DOM object that invoked the event?

event.element
event.source
event.target
event.invoker

Why is the event.preventDefault() command used?

To prevent the setting of default data values in the database
To prevent the execution of default actions in response to an event trigger
To enforce the submission of a form
To stop execution of all code

Which event trigger indicates the DOM has finished loading and processing?

DOMContentLoaded
DOMReady
DOMFinished
DocumentReady

How many buttons are there in an alert box?

one
Two
Three
four

Which of the following is not a mouse event?

onmousescroller
onclick
onmouseover
onmousemove

Which of the following is not an event that can trigger a Javascript?

mouse actions
operating system actions
keyboard actions
timed actions

Which event is triggered if the browser window is resized ?

onload
onscroll
onresize
onnewsize

Which event is triggered when a field loses the focus ?

onmouseout
onblur
onunfocus
onkeyup

You define a method using ?

obj.method
obj.method[]
obj.method()
obj-method

Which of these statements is true ?

arguments are parameters
arguments and parameters must have the same name
arguments are placeholders
arguments are disagreements between parameters

Which of the following is NOT a valid Alert call?

alert('A')
alert(a)
alert(a+b)
alert(#)

When can you not trigger Javascript from an event handler ?

when another event is still being processed
when Javascript is disabled
when the page uses stylesheets
when it is running locally instead of on the web

Which event tests if a form field has changed?

onsubmit
onblur
onchange
onclick

Which of these contains an executable statement?

// var x = 10; // var y = 0
/* var x = 10; // var y = 0; */
/* var x = 10; */ var y = 0
// var x = 10; /* var y = 0

Assume that a function myfunction is defined at some place . Which of the following is NOT a valid function call?

var z = myfunction()
myfunction
z = myfunction
myfunction()

Assume that value of A is 10 and value of B is 15. Which of the following returns a true value in if statement.

if A not = B
if A != B
if (A not = B)
if (A != B)

Which of the following is not a builtin Javascript object?

Time
Array
Date
Math

What command skips the rest of a case statement?

return
exit
continue
break

How many parameters can be passed to one function?

none
as many as you like
one for each argument
one

Consider the following code for switch loop
case 10:

case 12:
What will run next if the value is 10?

the code following the case 12:
the code following default:
the code after the end of the switch
this is a coding error

What does ++ do?

Adds two numbers together
Joins two text strings together
Adds 1 to a number
Adds 2 to a number

What is correct about a method

A method is the object oriented version of a function
A method is the object oriented version of a variable
A method is the object oriented version o fa sequence
A method is the object oriented version of a program

var a= ‘Z’; var b = 32; a = b; Variable ‘a’ now contains?

text
a number
true
it is not possible to tell

Quiz Summary

Information

Results

Results

Categories

1. Question

2. Question

3. Question

4. Question

5. Question

6. Question

7. Question

8. Question

9. Question

10. Question

11. Question

12. Question

13. Question

14. Question

15. Question

16. Question

17. Question

18. Question

19. Question

20. Question

21. Question

22. Question

23. Question

24. Question

25. Question

26. Question

27. Question

28. Question

29. Question

30. Question

31. Question

32. Question

33. Question

34. Question

35. Question

36. Question