MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Javascript knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
WHEN_DOES_A_CYCLE_OCCUR_DURING_MEMORY_LEAK??$ |
| A. | No reference occurs |
| B. | Two objects reference |
| C. | One object gets referenced |
| D. | None of the mentioned |
| Answer» C. One object gets referenced | |
| 2. |
Which_of_the_following_is_a_way_to_retain_an_object_in_memory?$ |
| A. | Console Log |
| B. | Closures |
| C. | Destroy objects |
| D. | All of the mentioned |
| Answer» B. Closures | |
| 3. |
What is the purpose of destroying the functions and objects? |
| A. | Consume unnecessary CPU cycles |
| B. | Prevent the dropping of reference count to 0 |
| C. | Centralize the responsibility to clean up |
| D. | All of the mentioned |
| Answer» E. | |
| 4. |
Which of the following functions are referenced internally? |
| A. | setTimeout |
| B. | setInterval |
| C. | both setTimeout and setInterval |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 5. |
The style property belongs to while of the following object? |
| A. | Element |
| B. | Window |
| C. | Location |
| D. | None of the mentioned |
| Answer» B. Window | |
| 6. |
What will happen when the data of the jQuery.cache is read from an element? |
| A. | Unique number is retrieved as <b>elem[jQuery.expando]</b> |
| B. | Data is read from <b>jQuery.cache[id]</b> |
| C. | Unique number is retrieved as <b>elem[jQuery.expando]</b> & Data is read from <b>jQuery.cache[id]</b> |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 7. |
When does a memory leak happen? |
| A. | Browser doesn’t release memory from objects unnecessary |
| B. | Browser releases too many memories |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» B. Browser releases too many memories | |
| 8. |
What is the central concept of JavaScript memory management? |
| A. | Reliability |
| B. | Reachability |
| C. | Efficiency |
| D. | Transparency |
| Answer» C. Efficiency | |
| 9. |
Which handler is triggered when the content of the document in the window is stable and ready for manipulation? |
| A. | onload |
| B. | manipulate |
| C. | create |
| D. | none of the mentioned |
| Answer» B. manipulate | |
| 10. |
Where are memory leaks found? |
| A. | Client side objects |
| B. | Server side objects |
| C. | Both Client side and Server side objects |
| D. | None of the mentioned |
| Answer» B. Server side objects | |