MCQOPTIONS
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MCQOPTIONS
This section includes 302 Mcqs, each offering curated multiple-choice questions to sharpen your Javascript knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
What is the purpose of a return statement in a function? |
| A. | Returns the value and continues executing rest of the statements, if any |
| B. | Returns the value and stops the program |
| C. | Returns the value and stops executing the function |
| D. | Stops executing the function and returns the value |
| Answer» E. | |
| 202. |
Consider the following code snippet function printprops(o) { for(var p in o) console.log(p + ": " + o[p] + "\n"); } What will the above code snippet result ? |
| A. | Prints the contents of each property of o |
| B. | Returns undefined |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» C. All of the mentioned | |
| 203. |
Consider the following code snippet : if (!a[i]) continue; What is the observation made ? |
| A. | Skips the undefined elements |
| B. | Skips the non existent elements |
| C. | Skips the null elements |
| D. | All of the mentioned |
| Answer» E. | |
| 204. |
Consider the following code snippet var a1 = [,,,]; var a2 = new Array(3); 0 in a1 0 in a2 The result would be |
| A. | true false |
| B. | false true |
| C. | true true |
| D. | false true |
| Answer» B. false true | |
| 205. |
Consider the code snippet given below var count = [1,,3]; What is the observation made? |
| A. | The omitted value takes “undefined” |
| B. | This results in an error |
| C. | This results in an exception |
| D. | None of the mentioned |
| Answer» B. This results in an error | |
| 206. |
Local Variables are destroyed after execution of function.~! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 207. |
Variable declared inside JavaScript Function will be called as ____________.~! |
| A. | Local Variables |
| B. | Global Variables |
| Answer» B. Global Variables | |
| 208. |
Underscore can be used as first letter while declaring variable in JavaScript.~! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 209. |
Which was the first browser to support JavaScript ?%! |
| A. | IE |
| B. | Netscape |
| C. | Mozilla Firefox |
| D. | Google Chrome |
| Answer» C. Mozilla Firefox | |
| 210. |
Which attribute is used to specifies that the script is executed when the page has finished parsing (only for external scripts)%! |
| A. | parse |
| B. | async |
| C. | defer |
| D. | type |
| Answer» D. type | |
| 211. |
It is good to include JS code inside footer section in order to speed up the Page loading time of Webpage.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 212. |
JS code included inside head section is loaded before loading page.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 213. |
JavaScript Code can be called by using _________.%! |
| A. | RMI |
| B. | Triggering Event |
| C. | Preprocessor |
| D. | Function / Method |
| Answer» E. | |
| 214. |
We can embed JS code inside HTML directly ?%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 215. |
Multiple Declarations of variables are separated by ___________ symbol.%! |
| A. | Comma |
| B. | Semicolon |
| C. | Asterisk |
| D. | Colon |
| Answer» B. Semicolon | |
| 216. |
Local Browser used for validations on the Web Pages uses __________.%! |
| A. | CSS |
| B. | JS |
| C. | HTML |
| D. | Java |
| Answer» C. HTML | |
| 217. |
Initialization of variable can be done by writing _____ operator in between variable name and operand value.%! |
| A. | EQUALS |
| B. | = |
| C. | VALUE |
| D. | == |
| Answer» C. VALUE | |
| 218. |
JavaScript Code is written inside file having extension __________.%! |
| A. | .javascript |
| B. | .jsc |
| C. | .jvs |
| D. | .js |
| Answer» E. | |
| 219. |
Java Script Variable should be Case ___________.%! |
| A. | Non Sensitive |
| B. | Sensitive |
| Answer» C. | |
| 220. |
JavaScript is designed for following purpose%! |
| A. | To Style HTML Pages |
| B. | To Execute Query Related to DB on Server |
| C. | To add interactivity to HTML Pages. |
| D. | To Perform Server Side Scripting Opertion |
| Answer» D. To Perform Server Side Scripting Opertion | |
| 221. |
Spaces,Punctuation marks are called as __________ Symbols in JavaScript.%! |
| A. | Punctual |
| B. | None of these |
| C. | Mandetory |
| D. | Special |
| Answer» E. | |
| 222. |
JavaScript is ______ Side Scripting Language.%! |
| A. | Server |
| B. | Browser |
| C. | ISP |
| D. | None of These |
| Answer» C. ISP | |
| 223. |
We can declare ___________ at a time. Select most appropriate option.%! |
| A. | One or more Variables |
| B. | More than One Variables |
| C. | One Variable Only |
| D. | None of these |
| Answer» B. More than One Variables | |
| 224. |
A statement block is a%! |
| A. | conditional block |
| B. | block that contains a single statement |
| C. | Both conditional block and single statement |
| D. | block that combines multiple statements into a single compound statement |
| Answer» E. | |
| 225. |
JavaScript is a _______________ language%! |
| A. | Object-Oriented |
| B. | High-level |
| C. | Assembly-language |
| D. | Object-Based |
| Answer» E. | |
| 226. |
What will happen if the body of a for/in loop deletes a property that has not yet been enumerated?%! |
| A. | The property will be stored in a cache |
| B. | The loop will not run |
| C. | That property will not be enumerated |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 227. |
The enumeration order becomes implementation dependent and non-interoperable if :%! |
| A. | If the object inherits enumerable properties |
| B. | The object does not have the properties present in the integer array indices |
| C. | The delete keyword is never used |
| D. | Object.defineProperty() is not used |
| Answer» B. The object does not have the properties present in the integer array indices | |
| 228. |
A proper scripting language is a%! |
| A. | High level programming language |
| B. | Assembly level programming language |
| C. | Machinen level programming language |
| D. | Low level programming language |
| Answer» B. Assembly level programming language | |
| 229. |
To determine whether one object is the prototype of (or is part of the prototype chain of) another object, one should use the%! |
| A. | isPrototypeOf() method |
| B. | equals() method |
| C. | === operator |
| D. | none of the mentioned |
| Answer» B. equals() method | |
| 230. |
Javascript is _________ language.%! |
| A. | Programming |
| B. | Application |
| C. | None of These |
| D. | Scripting |
| Answer» E. | |
| 231. |
The unordered collection of properties, each of which has a name and a value is called%! |
| A. | String |
| B. | Object |
| C. | Serialized Object |
| D. | All of the mentioned |
| Answer» C. Serialized Object | |
| 232. |
The JavaScript’s syntax calling ( or executing ) a function or method is called%! |
| A. | Primary expression |
| B. | Functional expression |
| C. | Invocation expression |
| D. | Property Access Expression |
| Answer» D. Property Access Expression | |
| 233. |
When there is an indefinite or an infinity value during an arithmetic value computation, javascript%! |
| A. | Prints an exception error |
| B. | Prints an overflow error |
| C. | Displays “Infinity” |
| D. | Prints the value as such |
| Answer» D. Prints the value as such | |
| 234. |
*$_Integer Variable is declared using following syntax in JavaScript.? |
| A. | int num; |
| B. | Integer num; |
| C. | integer num; |
| D. | var num; |
| Answer» E. | |
| 235. |
*/*_A proper scripting language is a? |
| A. | High level programming language |
| B. | Assembly level programming language |
| C. | Machinen level programming language |
| D. | Low level programming language |
| Answer» B. Assembly level programming language | |
| 236. |
*/*_The enumeration order becomes implementation dependent and non-interoperable if :? |
| A. | If the object inherits enumerable properties |
| B. | The object does not have the properties present in the integer array indices |
| C. | The delete keyword is never used |
| D. | Object.defineProperty() is not used |
| Answer» B. The object does not have the properties present in the integer array indices | |
| 237. |
*/*_A statement block is a? |
| A. | conditional block |
| B. | block that contains a single statement |
| C. | Both conditional block and single statement |
| D. | block that combines multiple statements into a single compound statement |
| Answer» E. | |
| 238. |
*/*_What will happen if the body of a for/in loop deletes a property that has not yet been enumerated?? |
| A. | The property will be stored in a cache |
| B. | The loop will not run |
| C. | That property will not be enumerated |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 239. |
*/*_Assume that we have to convert “false” that is a non-string to string. The command that we use is (without invoking the “new” operator)? |
| A. | false.toString() |
| B. | String(false) |
| C. | String newvariable=”false” |
| D. | Both false.toString() and String(false) |
| Answer» E. | |
| 240. |
*/*_When there is an indefinite or an infinity value during an arithmetic value computation, javascript? |
| A. | Prints an exception error |
| B. | Prints an overflow error |
| C. | Displays “Infinity” |
| D. | Prints the value as such |
| Answer» D. Prints the value as such | |
| 241. |
*/*_JavaScript is a _______________ language? |
| A. | Object-Oriented |
| B. | High-level |
| C. | Assembly-language |
| D. | Object-Based |
| Answer» E. | |
| 242. |
*/*_The JavaScript’s syntax calling ( or executing ) a function or method is called? |
| A. | Primary expression |
| B. | Functional expression |
| C. | Invocation expression |
| D. | Property Access Expression |
| Answer» D. Property Access Expression | |
| 243. |
*/*_To determine whether one object is the prototype of (or is part of the prototype chain of) another object, one should use the? |
| A. | isPrototypeOf() method |
| B. | equals() method |
| C. | === operator |
| D. | none of the mentioned |
| Answer» B. equals() method | |
| 244. |
*/*_Javascript is _________ language.? |
| A. | Programming |
| B. | Application |
| C. | None of These |
| D. | Scripting |
| Answer» E. | |
| 245. |
*/*_JavaScript is ideal to? |
| A. | make computations in HTML simpler |
| B. | minimize storage requirements on the web server |
| C. | increase the download time for the client |
| D. | none of the mentioned |
| Answer» C. increase the download time for the client | |
| 246. |
*/*_The unordered collection of properties, each of which has a name and a value is called? |
| A. | String |
| B. | Object |
| C. | Serialized Object |
| D. | All of the mentioned |
| Answer» C. Serialized Object | |
| 247. |
*/*_Which is a more efficient code snippet ?Code 1 :for(var num=10;num>=1;num--){ document.writeln(num);}Code 2 :var num=10;while(num>=1){ document.writeln(num); num++;}? |
| A. | Code 1 |
| B. | Code 2 |
| C. | Both Code 1 and Code 2 |
| D. | Cannot Compare |
| Answer» B. Code 2 | |
| 248. |
*/*_“An expression that can legally appear on the left side of an assignment expression.” is a well known explanation for variables, properties of objects, and elements of arrays. They are called? |
| A. | Properties |
| B. | Prototypes |
| C. | Lvalue |
| D. | Definition |
| Answer» D. Definition | |
| 249. |
*/*_One of the special feature of an interpreter in reference with the for loop is that? |
| A. | Before each iteration, the interpreter evaluates the variable expression and assigns the name of the property |
| B. | The iterations can be infinite when an interpreter is used |
| C. | The body of the loop is executed only once |
| D. | All of the mentioned |
| Answer» B. The iterations can be infinite when an interpreter is used | |
| 250. |
*/*_Consider the following statementsvar count = 0;while (count < 10) { console.log(count); count++;}In the above code snippet, what happens?? |
| A. | The values of count is logged or stored in a particular location or storage |
| B. | The value of count from 0 to 9 is displayed in the console |
| C. | An error is displayed |
| D. | An exception is thrown |
| Answer» C. An error is displayed | |