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Invocation And Performance Navigation MCQ question and answer in javascript with solution

Learn Invocation And Performance Navigation MCQ Questions and answers in javascript with easy and logical explanations. Invocation And Performance Navigation MCQ question in Javascript which provides all type of technical mcq questions which is important for technical exams, cumpus exams and other entrance examination

1
Which of the following property gives access to the JavaScript memory usage data?
Discuss
Answer & Solution
Answer: Option A
Solution:
The property performance.memory gives access to the JavaScript memory usage data.
2
What is the purpose of the timing property in the window.performance object?
Discuss
Answer & Solution
Answer: Option C
Solution:
Each performance.timing attribute shows the time of a navigation event (such as when the page was requested) or page load event (such as when the DOM began loading), measured in milliseconds.
3
Which of the following property is associated with the Response event?
Discuss
Answer & Solution
Answer: Option C
Solution:
The properties associated with the Response event are :
1. responseStart
2. responseEnd.
4
Which of the following computation is correct to calculate the time taken for page load once the page is received from the server?
Discuss
Answer & Solution
Answer: Option B
Solution:
The time taken for page load once the page is received from the server: loadEventEnd-responseEnd.
5
Which of the following property is associated with the Processing event?
Discuss
Answer & Solution
Answer: Option D
Solution:
The following properties are associated with the Processing event :
1. domComplete
2. domContentLoaded
3. domInteractive
4. domLoading
5. unLoadEnd
6
What does it indicate when the type attribute of the navigation object is set to 2?
Discuss
Answer & Solution
Answer: Option C
Solution:
When the type attribute of the navigation object is set to 2, it means that the navigation is done by moving back or forward through history.
7
What does the method Performance.now() return?
Discuss
Answer & Solution
Answer: Option B
Solution:
The Performance.now() method returns a DOMHighResTimeStamp, measured in milliseconds, accurate to one thousandth of a millisecond equal to the number of milliseconds since the PerformanceTiming.navigationStart property and the call to the method.
8
Which of the following is a read-only property?
Discuss
Answer & Solution
Answer: Option C
Solution:
Both PerformanceTiming.navigationStart and also the PerformanceTiming.fetchStart are a read-only properties.
9
Which of the following is an interface?
Discuss
Answer & Solution
Answer: Option D
Solution:
PerformanceTiming is an interface in JavaScript.
10
How many properties are associated with the Response event?
Discuss
Answer & Solution
Answer: Option B
Solution:
There are a total of 2 properties associated with the Response event namely :
1. PerformanceTiming.responseEnd
2. PerformanceTiming.responseStart