*$_What would happen if there were no script tags??

Layout positioning of DOM elements

*$_To define each of the set classes as a property of the sets object (namespace) for the module, the statement is?

sets.SingletonSet = sets.extend(...);

sets = sets.AbstractEnumerableSet.extend();

sets.SingletonSet = sets.AbstractEnumerableSet.extend(...);

sets.SingletonSet = sets.extend(...);

*/*_What is the purpose of the navigation property in the window.performance object??

To which page the user navigated

*/*_What is the purpose of garbage collection??

Removes object with many reference

Removes object with invalid reference

Removes object with no reference

*/*_What will happen after executing the script??

Layout positioning of DOM elements

*/*_What is the purpose of creating a data frame??

Hold the page render time & load time

_ What will happen after executing the script?$?

Layout positioning of DOM elements

_ What is the purpose of creating a data frame?$?

Hold the page render time & load time

_ How can one access the redirectCount property?$?

performance.navigation.redirectCount

_ Which of the following property is associated with the Request event?$?

both requestStart and requestEnd

_ Which of the following runs the JavaScript code?$?

Both Just In Time compiler and JavaScript Interpreter

_ What is the command to access the Heap size limit?$?

performance.memory. jsHeapSizeLimit

_What is the purpose of the startTimeLogging() method?$?

Capture timing data for referencing

_What is the purpose of the method localeCompare()?$?

If the reference string is validated

If the reference string comes before or after another string

If the reference string is validated

If the string is a reference string

_What does the appendChild() method perform?$?

Appends a node in the middle of the index taken as the parameter

Appends a node as the first child

Appends a node as the last child

_How is the render time calculated?$?

Date.Now() ‚Äö√Ñ√¨ performance.timing.domLoading

Date.Now() ‚Äö√Ñ√¨ performance.domLoading

What is the purpose of the property PerformanceTiming.fetchStart?$?

Browser ready to fetch document

133 + Mcqs in Invocation And Performance Navigation in Javascript Page 2 McqOptions

51.	Which of the following API can be used to get the timing without affecting the page loading process?%!
A.	Navigation API
B.	Timing API
C.	Navigation Timing API
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

52.	Which of the following is an attribute to the script object?%!
A.	onclick
B.	onload
C.	onshow
D.	all of the mentioned
Answer» C. onshow

Discussion

53.	*$_What should be the type of the script_url??
A.	Object
B.	String
C.	Array
D.	Any of the mentioned
Answer» E.

Discussion

54.	*$_What is the method used to create an element in the HTML DOM??
A.	createDOMelement()
B.	createElement()
C.	createDOMElement()
D.	none of the mentioned
Answer» C. createDOMElement()

Discussion

55.	*$_What would happen if there were no script tags??
A.	Build DOM nodes in render tree
B.	Layout positioning of DOM elements
C.	Paint DOM elements
D.	Execute script
Answer» B. Layout positioning of DOM elements

Discussion

56.	*$_Which of the following navigator object properties is the same in both Netscape and IE??
A.	navigator.appCodeName
B.	navigator.appName
C.	navigator.appVersion
D.	none of the mentioned
Answer» B. navigator.appName

Discussion

57.	*$_To define each of the set classes as a property of the sets object (namespace) for the module, the statement is?
A.	sets = sets.AbstractEnumerableSet.extend();
B.	sets.SingletonSet = sets.AbstractEnumerableSet.extend(...);
C.	sets.SingletonSet = sets.extend(...);
D.	sets = sets.extend(...);
Answer» C. sets.SingletonSet = sets.extend(...);

Discussion

58.	/_How to lazy load images??
A.	Remove the rel attribute
B.	Remove the src attribute
C.	Make rel = src
D.	Make src = rel
Answer» C. Make rel = src

Discussion

59.	/_You can refresh the webpage in JavaScript by using?
A.	window.reload
B.	location.reload
C.	window.refresh
D.	page.refresh
Answer» C. window.refresh

Discussion

60.	/_How many constant values can the property type be represented??
A.	2
B.	3
C.	4
D.	5
Answer» D. 5

Discussion

61.	/_Which of the following API can be used to get the timing without affecting the page loading process??
A.	Navigation API
B.	Timing API
C.	Navigation Timing API
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

62.	/_What is the purpose of the navigation property in the window.performance object??
A.	To which page the user navigated
B.	How the user navigated
C.	All of the mentioned
D.	None of the mentioned
Answer» C. All of the mentioned

Discussion

63.	/_Which keyword must be used to get a more granular insight of the memory usage??
A.	verb
B.	verbose
C.	granule
D.	none of the mentioned
Answer» C. granule

Discussion

64.	/_Which of the following layer retrieves the content from the network??
A.	Transport Layer
B.	Application Layer
C.	Network Layer
D.	Physical Layer
Answer» D. Physical Layer

Discussion

65.	/_How many properties are associated with the Response event??
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

Discussion

66.	/_What is the purpose of garbage collection??
A.	Removes object with many reference
B.	Removes object with reference
C.	Removes object with invalid reference
D.	Removes object with no reference
Answer» E.

Discussion

67.	/_Where does the DNS Lookup direct to ??
A.	Browser
B.	Client
C.	Server
D.	DNS Server
Answer» E.

Discussion

68.	/_Which of the following is an attribute to the script object??
A.	onclick
B.	onload
C.	onshow
D.	all of the mentioned
Answer» C. onshow

Discussion

69.	/_Which of the following property is associated with the Processing event??
A.	domComplete
B.	domContentLoaded
C.	domInteractive
D.	none of the mentioned
Answer» E.

Discussion

70.	/_How to get a particular value using the tagged name??
A.	getElementbyID()
B.	getElementsbyName()
C.	getElementsbyTagName()
D.	getTagName()
Answer» D. getTagName()

Discussion

71.	/_What will happen after executing the script??
A.	Execute script
B.	Layout positioning of DOM elements
C.	Paint DOM elements
D.	Build DOM nodes in render tree
Answer» E.

Discussion

72.	/_What is the purpose of creating a data frame??
A.	Hold the page render time
B.	Hold the load time
C.	Hold the page render time & load time
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

73.	/_When the ‚Äö√Ñ√∫end‚Äö√Ñ√π event fires on EOF when no more data will arrive, which function is called??
A.	s.on("data",f);
B.	s.on("end",f);
C.	s.on("error",f);
D.	s.on("default",f);
Answer» C. s.on("error",f);

Discussion

74.	/_What is the type of datatype the async attribute optionally accepts??
A.	Integer
B.	String
C.	Boolean
D.	Decimal
Answer» D. Decimal

Discussion

75.	_ How to get a particular value using the tagged name?$?
A.	getElementbyID()
B.	getElementsbyName()
C.	getElementsbyTagName()
D.	getTagName()
Answer» D. getTagName()

Discussion

76.	_ What is the type of datatype the async attribute optionally accepts?$?
A.	Integer
B.	String
C.	Boolean
D.	Decimal
Answer» D. Decimal

Discussion

77.	_ What will happen after executing the script?$?
A.	Execute script
B.	Layout positioning of DOM elements
C.	Paint DOM elements
D.	Build DOM nodes in render tree
Answer» E.

Discussion

78.	_ What is the purpose of creating a data frame?$?
A.	Hold the page render time
B.	Hold the load time
C.	Hold the page render time & load time
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

79.	_ When the ‚Äö√Ñ√∫end‚Äö√Ñ√π event fires on EOF when no more data will arrive, which function is called?$?
A.	s.on("data",f);
B.	s.on("end",f);
C.	s.on("error",f);
D.	s.on("default",f);
Answer» C. s.on("error",f);

Discussion

80.	_ What should be the value of the type attribute of a variable if the type of file is CSS?$?
A.	text/js/css
B.	text/js
C.	text/css
D.	text
Answer» D. text

Discussion

81.	_ The object whose properties are inherited by all instances of the class, and properties whose values are functions behaving like instance methods of the class, is$?
A.	Instance object
B.	Constructor object
C.	Destructor object
D.	Prototype object
Answer» E.

Discussion

82.	_ How can one access the redirectCount property?$?
A.	navigation.redirectCount
B.	performance.navigation.redirectCount
C.	performance.redirectCount
D.	redirectCount
Answer» C. performance.redirectCount

Discussion

83.	_ Which of the following property is associated with the Request event?$?
A.	requestStart
B.	requestEnd
C.	both requestStart and requestEnd
D.	none of the mentioned
Answer» B. requestEnd

Discussion

84.	_ How many properties are there in window.performance object?$?
A.	1
B.	4
C.	2
D.	3
Answer» D. 3

Discussion

85.	_ Which of the following gives the high level breakdown of memory usage?$?
A.	about:memory
B.	memory
C.	about-memory
D.	about::memory
Answer» B. memory

Discussion

86.	_ Which of the following runs the JavaScript code?$?
A.	Just In Time compiler
B.	JavaScript Interpreter
C.	Both Just In Time compiler and JavaScript Interpreter
D.	None of the mentioned
Answer» C. Both Just In Time compiler and JavaScript Interpreter

Discussion

87.	_ Which of the following is an interface?$?
A.	Time
B.	Timing
C.	Performance
D.	PerformanceTiming
Answer» E.

Discussion

88.	_ What is the command to access the Heap size limit?$?
A.	performance.memory. SizeLimit
B.	performance.memory. jsHeapSizeLimit
C.	jsHeapSizeLimit
D.	performance.jsHeapSizeLimit
Answer» C. jsHeapSizeLimit

Discussion

89.	_ Which of the following constants hold the value 2?$?
A.	TYPE_NAVIGATE
B.	TYPE_RELOAD
C.	TYPE_BACK_FORWARD
D.	TYPE_RESERVED
Answer» D. TYPE_RESERVED

Discussion

90.	_ What is the result when the showPerformanceMetrics() is called before loading the remote script?$?
A.	Throws an exception
B.	Throws an error
C.	It will load by itself
D.	None of the mentioned
Answer» C. It will load by itself

Discussion

91.	_ Which of the following computation is correct to calculate the time taken for page load once the page is received from the server?$?
A.	responseEnd-loadEventEnd
B.	loadEventEnd-responseEnd
C.	loadEventEnd/responseEnd
D.	responseEnd/loadEventEnd
Answer» C. loadEventEnd/responseEnd

Discussion

92.	_What is the solution to the absence of a script tag without an src attribute?$?
A.	Resend the scripts
B.	Create inline JavaScript
C.	All of the mentioned
D.	None of the mentioned
Answer» C. All of the mentioned

Discussion

93.	_What is the purpose of the startTimeLogging() method?$?
A.	Start the timer
B.	Capture time logging
C.	Capture timing data for referencing
D.	All of the mentioned
Answer» E.

Discussion

94.	_Which is the next step after retrieving the content in chunks?$?
A.	Paint DOM elements
B.	Parse Content
C.	Build DOM nodes in render tree
D.	None of the mentioned
Answer» C. Build DOM nodes in render tree

Discussion

95.	_What is the method to create a data frame ?$?
A.	frame(data)
B.	frameData()
C.	data.frame()
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

96.	_What is the purpose of the method localeCompare()?$?
A.	If the reference string comes before or after another string
B.	If the reference string is validated
C.	If the string is a reference string
D.	None of the mentioned
Answer» B. If the reference string is validated

Discussion

97.	_What does the appendChild() method perform?$?
A.	Appends a node in the middle of the index taken as the parameter
B.	Appends a node as the first child
C.	Appends a node as the last child
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

98.	_How is the render time calculated?$?
A.	Date.Now()
B.	Date.Now() ‚Äö√Ñ√¨ performance.timing.domLoading
C.	performance.domLoading
D.	Date.Now() ‚Äö√Ñ√¨ performance.domLoading
Answer» C. performance.domLoading

Discussion

99.	Where does the DNS reply go to in a single HTTP redirect?$?
A.	Browser
B.	Client
C.	Server
D.	DNS Server
Answer» B. Client

Discussion

100.	What is the purpose of the property PerformanceTiming.fetchStart?$?
A.	Browser ready to fetch input
B.	Browser ready to fetch document
C.	Browser ready to fetch summary
D.	All of the mentioned
Answer» C. Browser ready to fetch summary

Discussion

Explore topic-wise MCQs in Javascript.

Which of the following API can be used to get the timing without affecting the page loading process?%!

Which of the following is an attribute to the script object?%!

*$_What should be the type of the script_url??

*$_What is the method used to create an element in the HTML DOM??

*$_What would happen if there were no script tags??

*$_Which of the following navigator object properties is the same in both Netscape and IE??

*$_To define each of the set classes as a property of the sets object (namespace) for the module, the statement is?

*/*_How to lazy load images??

*/*_You can refresh the webpage in JavaScript by using?

*/*_How many constant values can the property type be represented??

*/*_Which of the following API can be used to get the timing without affecting the page loading process??

*/*_What is the purpose of the navigation property in the window.performance object??

*/*_Which keyword must be used to get a more granular insight of the memory usage??

*/*_Which of the following layer retrieves the content from the network??

*/*_How many properties are associated with the Response event??

*/*_What is the purpose of garbage collection??

*/*_Where does the DNS Lookup direct to ??

*/*_Which of the following is an attribute to the script object??

*/*_Which of the following property is associated with the Processing event??

*/*_How to get a particular value using the tagged name??

*/*_What will happen after executing the script??

*/*_What is the purpose of creating a data frame??

*/*_When the ‚Äö√Ñ√∫end‚Äö√Ñ√π event fires on EOF when no more data will arrive, which function is called??

*/*_What is the type of datatype the async attribute optionally accepts??

_ How to get a particular value using the tagged name?$?

_ What is the type of datatype the async attribute optionally accepts?$?

_ What will happen after executing the script?$?

_ What is the purpose of creating a data frame?$?

_ When the ‚Äö√Ñ√∫end‚Äö√Ñ√π event fires on EOF when no more data will arrive, which function is called?$?

_ What should be the value of the type attribute of a variable if the type of file is CSS?$?

_ The object whose properties are inherited by all instances of the class, and properties whose values are functions behaving like instance methods of the class, is$?

_ How can one access the redirectCount property?$?

_ Which of the following property is associated with the Request event?$?

_ How many properties are there in window.performance object?$?

_ Which of the following gives the high level breakdown of memory usage?$?

_ Which of the following runs the JavaScript code?$?

_ Which of the following is an interface?$?

_ What is the command to access the Heap size limit?$?

_ Which of the following constants hold the value 2?$?

_ What is the result when the showPerformanceMetrics() is called before loading the remote script?$?

_ Which of the following computation is correct to calculate the time taken for page load once the page is received from the server?$?

_What is the solution to the absence of a script tag without an src attribute?$?

_What is the purpose of the startTimeLogging() method?$?

_Which is the next step after retrieving the content in chunks?$?

_What is the method to create a data frame ?$?

_What is the purpose of the method localeCompare()?$?

_What does the appendChild() method perform?$?

_How is the render time calculated?$?

Where does the DNS reply go to in a single HTTP redirect?$?

What is the purpose of the property PerformanceTiming.fetchStart?$?

/_How to lazy load images??

/_You can refresh the webpage in JavaScript by using?

/_How many constant values can the property type be represented??

/_Which of the following API can be used to get the timing without affecting the page loading process??

/_What is the purpose of the navigation property in the window.performance object??

/_Which keyword must be used to get a more granular insight of the memory usage??

/_Which of the following layer retrieves the content from the network??

/_How many properties are associated with the Response event??

/_What is the purpose of garbage collection??

/_Where does the DNS Lookup direct to ??

/_Which of the following is an attribute to the script object??

/_Which of the following property is associated with the Processing event??

/_How to get a particular value using the tagged name??

/_What will happen after executing the script??

/_What is the purpose of creating a data frame??

/_When the ‚Äö√Ñ√∫end‚Äö√Ñ√π event fires on EOF when no more data will arrive, which function is called??

/_What is the type of datatype the async attribute optionally accepts??