MCQOPTIONS
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MCQOPTIONS
This section includes 157 Mcqs, each offering curated multiple-choice questions to sharpen your Javascript knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
_What does the NamedNodeMap object represent in the HTML DOM?$? |
| A. | Unordered collection of elements |
| B. | Unordered collection of attributes |
| C. | Unordered collection of nodes |
| D. | All of the mentioned |
| Answer» E. | |
| 102. |
_What is a closure compiler UI?$? |
| A. | Run time application |
| B. | Web application |
| C. | Standalone application |
| D. | All of the mentioned |
| Answer» C. Standalone application | |
| 103. |
_During the traversing of the stack when you create a locally scoped variable, where does it go after it goes to the namespace?$? |
| A. | Window |
| B. | Function |
| C. | Document |
| D. | Location |
| Answer» C. Document | |
| 104. |
_Why shouldn’t JavaScript functions not be too long?$? |
| A. | User friendliness |
| B. | Tie up event loops |
| C. | Browser becomes unresponsive |
| D. | All of the mentioned |
| Answer» E. | |
| 105. |
_Why is a closure template used?$? |
| A. | Statically updating in JavaScript |
| B. | To increase the efficiency and convenience |
| C. | Dynamically generating HTML in Java and JavaScript |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 106. |
_Which API makes the user’s current location available to browser-based application?$? |
| A. | Java API |
| B. | SDL API |
| C. | Object API |
| D. | Geolocation API |
| Answer» E. | |
| 107. |
_When does one use the event ready?$? |
| A. | Before loading |
| B. | During loading |
| C. | After loading |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 108. |
_Which of the following is possible to be referenced in external JavaScript?$? |
| A. | cpp |
| B. | cs |
| C. | php |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 109. |
_What is the purpose of the function parameter filetype?$? |
| A. | File type to be expected |
| B. | File type previously got |
| C. | File type that should not be got |
| D. | None of the mentioned |
| Answer» B. File type previously got | |
| 110. |
_When does a cycle occur during memory leak?$? |
| A. | No reference occurs |
| B. | Two objects reference |
| C. | One object gets referenced |
| D. | One object gets referenced |
| Answer» C. One object gets referenced | |
| 111. |
_The blobs are generally stored in$? |
| A. | Memory |
| B. | Disk |
| C. | Both Memory and Disk |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 112. |
_How can you send data using a Worker object?$? |
| A. | postMessage() |
| B. | sendMessage() |
| C. | Message() |
| D. | post() |
| Answer» B. sendMessage() | |
| 113. |
_What is the central concept of JavaScript memory management?$? |
| A. | Reliability |
| B. | Reachability |
| C. | Efficiency |
| D. | Transparency |
| Answer» C. Efficiency | |
| 114. |
_Which of the following is a subtype of Blob?$? |
| A. | Elemental Object |
| B. | Create Object |
| C. | Data Object |
| D. | File Object |
| Answer» E. | |
| 115. |
What will happen if you reference document.location from within an object?$? |
| A. | Traverses the queue |
| B. | Finds the bugs |
| C. | Traverses the stack |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 116. |
Which of the following are static methods in JavaScript?$? |
| A. | Date.parse() |
| B. | Date.UTC() |
| C. | Both Date.parse() and Date.UTC() |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 117. |
How do you find the number with the highest value of x and y?$? |
| A. | ceil(x,y) |
| B. | top(x,y) |
| C. | Math.ceil(x,y) |
| D. | Math.max(x,y) |
| Answer» E. | |
| 118. |
Which class provides an interface for invoking JavaScript methods and examining JavaScript properties?$? |
| A. | ScriptObject |
| B. | JSObject |
| C. | JavaObject |
| D. | Jobject |
| Answer» C. JavaObject | |
| 119. |
How do we debug a script?$? |
| A. | Use of JavaScript Validator |
| B. | Use of JavaScript Debugger |
| C. | Use of JavaScript Validator & Debugger |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 120. |
Where is the error icon option available?$? |
| A. | Tools |
| B. | Help |
| C. | File |
| D. | Edit |
| Answer» B. Help | |
| 121. |
Which of the following are the properties of a plug-in entry?$? |
| A. | name |
| B. | filename |
| C. | mimeTypes |
| D. | all of the mentioned |
| Answer» E. | |
| 122. |
What is the purpose of data format validation?$? |
| A. | Data correctness |
| B. | Mere data existence |
| C. | Both Data correctness and Mere data existence |
| D. | None of the mentioned |
| Answer» B. Mere data existence | |
| 123. |
What is the purpose of the Legacy DOM ?$? |
| A. | Makes the scripting easier |
| B. | Allows access to few keys and elements |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» C. All of the mentioned | |
| 124. |
What is the purpose of the simple mode?$? |
| A. | Removes whitespaces |
| B. | Does not remove white spaces |
| C. | Removes the unwanted words |
| D. | None of the mentioned |
| Answer» B. Does not remove white spaces | |
| 125. |
What is the purpose of the advanced mode in the closure compiler?$? |
| A. | Renames variables |
| B. | Renames function |
| C. | Both Renames variables and function |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 126. |
Which of the following functions are synchronous?$? |
| A. | load() |
| B. | require() |
| C. | both load() and require() |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 127. |
What will happen if you specify an absolute URL in the Worker constructor?$? |
| A. | Resolves itself |
| B. | Must have the same origin |
| C. | Must not have the same origin |
| D. | None of the mentioned |
| Answer» C. Must not have the same origin | |
| 128. |
The size of blobs are generally calculated in$? |
| A. | Meters |
| B. | Kilometers |
| C. | Bytes |
| D. | Pixels |
| Answer» D. Pixels | |
| 129. |
Which object can be used to create your own blobs?$? |
| A. | Creator |
| B. | BlobCreator |
| C. | BlobBuilder |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 130. |
Which handler is triggered when the content of the document in the window is stable and ready for manipulation?$? |
| A. | onload |
| B. | manipulate |
| C. | create |
| D. | none of the mentioned |
| Answer» B. manipulate | |
| 131. |
What is the purpose of destroying the functions and objects?$? |
| A. | Consume unnecessary CPU cycles |
| B. | Prevent the dropping of reference count to 0 |
| C. | Centralize the responsibility to clean up |
| D. | All of the mentioned |
| Answer» E. | |
| 132. |
Which of the following is added to prefs.js when the console is automatically opened during JavaScript error?$? |
| A. | user_pref("javascript.console.open_on_error", true); |
| B. | user_pref("javascript.console.open_error ", true); |
| C. | user_pref("javascript.console.open_error ", false); |
| D. | user_pref(" javascript.console.open_on_error", false); |
| Answer» B. user_pref("javascript.console.open_error ", true); | |
| 133. |
How is everything treated in HTML DOM?$? |
| A. | Node |
| B. | Attributes |
| C. | Elements |
| D. | All of the mentioned |
| Answer» B. Attributes | |
| 134. |
What is the purpose of the RegExp method test()?$? |
| A. | Tests for a match in its float parameter |
| B. | Tests for a match in its string parameter |
| C. | Tests for a match in its integer parameter |
| D. | None of the mentioned |
| Answer» C. Tests for a match in its integer parameter | |
| 135. |
What is the purpose of XMLHttpRequest?$? |
| A. | Multiple loading |
| B. | Load content by loading new document |
| C. | Load content without loading new document |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 136. |
What is the purpose of the event disconnectionEvent?$? |
| A. | Player demands for disconnection |
| B. | Player disconnects from the channel |
| C. | There is no user interaction |
| D. | None of the mentioned |
| Answer» C. There is no user interaction | |
| 137. |
How is everything treated in HTML DOM?? |
| A. | Node |
| B. | Attributes |
| C. | Elements |
| D. | All of the mentioned |
| Answer» B. Attributes | |
| 138. |
What is the purpose of the simple mode?? |
| A. | Removes whitespaces |
| B. | Does not remove white spaces |
| C. | Removes the unwanted words |
| D. | None of the mentioned |
| Answer» B. Does not remove white spaces | |
| 139. |
During the traversing through the stack, where does it go after it goes to the window?? |
| A. | Namespace |
| B. | Function |
| C. | Document |
| D. | None of the mentioned |
| Answer» E. | |
| 140. |
Which of the following functions are synchronous?? |
| A. | load() |
| B. | require() |
| C. | both load() and require() |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 141. |
What is the purpose of the advanced mode in the closure compiler?? |
| A. | Renames variables |
| B. | Renames function |
| C. | Both Renames variables and function |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 142. |
What is the purpose of XMLHttpRequest?? |
| A. | Multiple loading |
| B. | Load content by loading new document |
| C. | Load content without loading new document |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 143. |
What is the purpose of the event disconnectionEvent?? |
| A. | Player demands for disconnection |
| B. | Player disconnects from the channel |
| C. | There is no user interaction |
| D. | None of the mentioned |
| Answer» C. There is no user interaction | |
| 144. |
Which of the following is added to prefs.js when the console is automatically opened during JavaScript error?? |
| A. | user_pref("javascript.console.open_on_error", true); |
| B. | user_pref("javascript.console.open_error ", true); |
| C. | user_pref("javascript.console.open_error ", false); |
| D. | user_pref(" javascript.console.open_on_error", false); |
| Answer» B. user_pref("javascript.console.open_error ", true); | |
| 145. |
What is the purpose of the RegExp method test()?? |
| A. | Tests for a match in its float parameter |
| B. | Tests for a match in its string parameter |
| C. | Tests for a match in its integer parameter |
| D. | None of the mentioned |
| Answer» C. Tests for a match in its integer parameter | |
| 146. |
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. | |
| 147. |
The size of blobs are generally calculated in? |
| A. | Meters |
| B. | Kilometers |
| C. | Bytes |
| D. | Pixels |
| Answer» D. Pixels | |
| 148. |
What will happen if you specify an absolute URL in the Worker constructor?? |
| A. | Resolves itself |
| B. | Must have the same origin |
| C. | Must not have the same origin |
| D. | None of the mentioned |
| Answer» C. Must not have the same origin | |
| 149. |
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 | |
| 150. |
Which object can be used to create your own blobs?? |
| A. | Creator |
| B. | BlobCreator |
| C. | BlobBuilder |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |