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Javascript
Invocation And Performance Navigation
Quiz 3
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Q.1
What does the rendering engine do when it encounters JavaScript?
Skips the code
Continues painting
Switches to Javascript Interpreter
None of the mentioned
Q.2
Which of the following runs the JavaScript code?
Just In Time compiler
JavaScript Interpreter
Both Just In Time compiler and JavaScript Interpreter
None of the mentioned
Q.3
Which of the following layer retrieves the content from the network?
Transport Layer
Application Layer
Network Layer
Physical Layer
Q.4
Which of the following property indicate the total size of heap?
heapSize
totalHeapSize
totalJsHeapSize
totalHeap
Q.5
What can be done to monitor the memory usage?
Profiling
Sequencing
Serializing
None of the mentioned
Q.6
Which of the following gives the high level breakdown of memory usage?
about:memory
memory
about-memory
about::memory
Q.7
What is the function of the memory object?
Gets unused memory details
Shows optimization
Gets memory usage
None of the mentioned
Q.8
What is the command to access the Heap size limit?
performance.memory. SizeLimit
performance.memory. jsHeapSizeLimit
jsHeapSizeLimit
performance.jsHeapSizeLimit
Q.9
What is the purpose of garbage collection?
Removes object with many reference
Removes object with reference
Removes object with invalid reference
Removes object with no reference
Q.10
What does the constant TYPE_BACK_FORWRD indicate?
Navigation via browser history
Navigation via user request
Navigation via URL
None of the mentioned
Q.11
Which of the following constants hold the value 2?
TYPE_NAVIGATE
TYPE_RELOAD
TYPE_BACK_FORWARD
TYPE_RESERVED
Q.12
Where does the DNS Lookup direct to ?
Browser
Client
Server
DNS Server
Q.13
Which keyword must be used to get a more granular insight of the memory usage?
verb
verbose
granule
none of the mentioned
Q.14
How many read-only attributes are present in the navigator object?
1
2
3
4
Q.15
Why are HTTP redirects significant?
TCP connection available
Complete roundtrip absent
Complete roundtrip present
None of the mentioned
Q.16
Where does the DNS reply go to in a single HTTP redirect?
Browser
Client
Server
DNS Server
Q.17
How can one access the redirectCount property?
navigation.redirectCount
performance.navigation.redirectCount
performance.redirectCount
redirectCount
Q.18
How many constant values can the property type be represented?
2
3
4
5
Q.19
How many properties does a prototype object have?
6
7
8
9
Q.20
What is the purpose of the property PerformanceTiming.navigationStart?
Ready to end the navigation
Ready to jump the navigation
Ready for navigation
None of the mentioned
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