MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Javascript knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 | |
| 2. |
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. | |
| 3. |
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 | |
| 4. |
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, i? |
| A. | Instance object |
| B. | Constructor object |
| C. | Destructor object |
| D. | Prototype object |
| Answer» E. | |
| 5. |
How is the render time calculated? |
| A. | Date.Now() |
| B. | Date.Now() – performance.timing.domLoading |
| C. | performance.domLoading |
| D. | Date.Now() – performance.domLoading |
| Answer» C. performance.domLoading | |
| 6. |
What is the purpose of the domLoading attribute? |
| A. | Document exists |
| B. | Document can load |
| C. | Document has loaded |
| D. | Document begins to load |
| Answer» E. | |
| 7. |
Which is the method used to add an event listener? |
| A. | addEventListener() |
| B. | addListener() |
| C. | addEvent(Listener) |
| D. | addListener(Event) |
| Answer» B. addListener() | |
| 8. |
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 | |
| 9. |
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 | |
| 10. |
What are the parameters of the attachEvent function? |
| A. | Function |
| B. | Function, Event |
| C. | Event, Function |
| D. | Event |
| Answer» D. Event | |
| 11. |
Where is the external JavaScript placed in the case of lazy loading? |
| A. | After <b>window.onload</b> event |
| B. | Before <b>window.onload</b> event |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» B. Before <b>window.onload</b> event | |
| 12. |
What is the purpose of lazy loading? |
| A. | Immediate loading is necessary |
| B. | Loading under command |
| C. | Immediate loading is not necessary |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |