MCQOPTIONS
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MCQOPTIONS
This section includes 96 Mcqs, each offering curated multiple-choice questions to sharpen your Javascript knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
"+=" operator can operate on following data values. |
| A. | Float |
| B. | String |
| C. | Integer |
| D. | All Options |
| Answer» E. | |
| 2. |
What type of value gets printed if we add following two variables ?var a = "1";var b = 5; |
| A. | Integer |
| B. | Long |
| C. | Number |
| D. | Text |
| Answer» E. | |
| 3. |
"===" operator is _______________. |
| A. | Is equal to |
| B. | Is identical (is equal to and is of the same type) |
| C. | Is identical (is equal to and is of the different type) |
| D. | None of these |
| Answer» C. Is identical (is equal to and is of the different type) | |
| 4. |
Integer Variable + Character Variable + Undefined Variable = ______________ Value |
| A. | Undefined Value |
| B. | Integer |
| C. | Character |
| D. | Text / String Value |
| Answer» B. Integer | |
| 5. |
Comments in JS are ignored by ____________. |
| A. | Compiler |
| B. | Operating System |
| C. | JVM |
| D. | Browser |
| Answer» E. | |
| 6. |
What will be the output of the following script ? |
| A. | 5 |
| B. | true |
| C. | 1 |
| D. | false |
| Answer» E. | |
| 7. |
Conditional Operator shown in the following example is _____________. |
| A. | Unary Operator |
| B. | Ternary Operator |
| C. | Binary Operator |
| D. | None of these |
| Answer» C. Binary Operator | |
| 8. |
Guess the ternary operator used in the following example !!! |
| A. | Conditional Operator |
| B. | Logical Operator |
| C. | Bitwise Operator |
| D. | Colon Operator |
| Answer» B. Logical Operator | |
| 9. |
______ attribute is used to specify the character encoding used in an external script file. |
| A. | type |
| B. | charset |
| C. | character |
| D. | None of These |
| Answer» C. character | |
| 10. |
What will be the Output of the below Code ? |
| A. | Will Throw Error |
| B. | Hello |
| C. | Will not print anything because of Comment |
| D. | None of These |
| Answer» C. Will not print anything because of Comment | |
| 11. |
Below Code contain one executive Statement. Guess the Output of the Code. |
| A. | "This is a heading" will be printed in H1 heading |
| B. | Just "This is a heading" will be printed because HTML tags are not allowed |
| C. | Will not print anything |
| D. | None of these |
| Answer» E. | |
| 12. |
What will be printed inside webpage ? |
| A. | It will crash browser since No Error handler is provided |
| B. | Hello JS |
| C. | "Hello JS" will be printed multiple times |
| D. | Nothing Will be printed because Code is not error free |
| Answer» E. | |
| 13. |
When you assign a text value to a variable, we put text value in the pair of _________. |
| A. | Single Quote |
| B. | Double Quote |
| C. | Square Bracket |
| D. | Both a and b |
| Answer» E. | |
| 14. |
Variable declared without a value will have the value ______________. |
| A. | |
| B. | undefined |
| C. | 0 |
| D. | None of these |
| Answer» C. 0 | |
| 15. |
What will be the output of the following ? |
| A. | Nothing will be printed |
| B. | Pritesh |
| C. | Error |
| D. | None of these |
| Answer» C. Error | |
| 16. |
In the following code, value of Z is |
| A. | 21.450 |
| B. | 21.451 |
| C. | 812.451 |
| D. | 813.451 |
| Answer» D. 813.451 | |
| 17. |
Non Initialized Variable have value "undefine", What value be printed in following case -var carname="Volvo"; var carname; |
| A. | undefined |
| B. | Error |
| C. | Volvo |
| D. | |
| Answer» D. | |
| 18. |
What will be the output of the following code ? |
| A. | 56 |
| B. | Error |
| C. | No Output |
| D. | 11 |
| Answer» E. | |
| 19. |
If a string cannot be converted to a number __________ will be returned. |
| A. | |
| B. | Infinite |
| C. | Null |
| D. | Zero |
| Answer» B. Infinite | |
| 20. |
Which JavaScript variable cannot be used as First character but can be use after first character ? |
| A. | Asterisk |
| B. | Dollar Sign |
| C. | Underscore |
| D. | Digit |
| Answer» E. | |
| 21. |
var num;Above Statement is called as __________ Statement. |
| A. | Instantization |
| B. | Globalization |
| C. | Declaration |
| D. | Initialization |
| Answer» D. Initialization | |
| 22. |
Guess output of the following code. |
| A. | 5 6 11 |
| B. | 5 6 56 |
| C. | 5 6 10 |
| D. | Error |
| Answer» B. 5 6 56 | |
| 23. |
What will be printed ? |
| A. | "Compile Error" will be printed |
| B. | "Compile" will be printed |
| C. | Nothing will be printed |
| D. | None of the above |
| Answer» B. "Compile" will be printed | |
| 24. |
What will be the value of Variable 'output' ? |
| A. | Nothing will be printed |
| B. | Str10 |
| C. | Null |
| D. | |
| Answer» C. Null | |
| 25. |
"++" can operate only on ________________. |
| A. | Constants |
| B. | Variables |
| C. | Text |
| D. | None of these |
| Answer» C. Text | |
| 26. |
Java Statement terminated by ______________ . |
| A. | Slash |
| B. | Semicolon |
| C. | Full Stop |
| D. | Comma |
| Answer» C. Full Stop | |
| 27. |
What will be the value of Variable - "num3" ?var num1; var num2 = 10;var num3 = num1 + num2; |
| A. | 10 |
| B. | undefine10 |
| C. | undefine |
| D. | None of these |
| Answer» D. None of these | |
| 28. |
Assignment Operators is following type of operator ______________. |
| A. | Binary |
| B. | Unary |
| C. | Ternary |
| D. | None of these |
| Answer» B. Unary | |
| 29. |
JavaScript was invented at _______ Lab . |
| A. | Netscape |
| B. | Google Lab |
| C. | AT&T Bell Lab |
| D. | Sun Microsystem |
| Answer» B. Google Lab | |
| 30. |
Which of the following statement is used to declare variable in JavaScript ? |
| A. | Assignment Statement |
| B. | Conditional Statement |
| C. | Executable Statement |
| D. | Declaration Statement |
| Answer» E. | |
| 31. |
"Add and Assignment" operator is shown by this symbol. |
| A. | +== |
| B. | += |
| Answer» C. | |
| 32. |
Which of the statement will be neglected by Browser ? |
| A. | <p>Google</p> |
| B. | <p>Yahoo</p> |
| C. | <h1>Heading</h1> |
| D. | All Statements |
| Answer» D. All Statements | |
| 33. |
Which of the following is not a comparison operator ? |
| A. | ++ |
| B. | <= |
| C. | >= |
| Answer» B. <= | |
| 34. |
Which of the following operator is used to concatenate two strings. |
| A. | Dot |
| B. | Arrow |
| C. | Comma |
| D. | Plus |
| Answer» E. | |
| 35. |
The async attribute can be set in the following ways - |
| A. | <script async> |
| B. | <script async=""> |
| C. | <script async="async"> |
| D. | All of These |
| Answer» E. | |
| 36. |
-Infinity in JS gets added with +Infinity then output of the code will be |
| A. | |
| B. | +Infinity |
| C. | -Infinity |
| D. | None of the above |
| Answer» B. +Infinity | |
| 37. |
JavaScript was originally developed under the name _______. |
| A. | ActionScript |
| B. | Mocha |
| C. | Oak |
| D. | Sencha |
| Answer» C. Oak | |
| 38. |
Which built-in method returns the character at the specified index? |
| A. | characterAt() |
| B. | getCharAt() |
| C. | charAt() |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 39. |
Java Script entities start with ___________and end with _____________. |
| A. | Semicolon, colon |
| B. | Semicolon, Ampersand |
| C. | Ampersand, colon |
| D. | Ampersand, semicolon |
| Answer» E. | |
| 40. |
Which of the following function of String object returns the calling string value converted to upper case while respecting the current locale? |
| A. | toLocaleUpperCase() |
| B. | toUpperCase() |
| C. | toString() |
| D. | substring() |
| Answer» B. toUpperCase() | |
| 41. |
....................... is a built - in JavaScript function which can be used to execute another function after a given time interval. |
| A. | Timeout( ) |
| B. | TimeInterval( ) |
| C. | setTimeout ( ) |
| D. | All of the above |
| Answer» D. All of the above | |
| 42. |
Which of the following function of String object executes the search for a match between a regular expression and a specified string? |
| A. | concat() |
| B. | match() |
| C. | replace() |
| D. | search() |
| Answer» E. | |
| 43. |
How can you get the type of arguments passed to a function? |
| A. | using typeof operator |
| B. | using getType function |
| C. | Both of the above. |
| D. | None of the above. |
| Answer» B. using getType function | |
| 44. |
In multiple line comment , End of the comment is specified by ________ Symbol. |
| A. | // |
| B. | */ |
| C. | *\ |
| D. | \\ |
| Answer» C. *\ | |
| 45. |
Person XYZ wrote his name and date of code creation at the start , What kind of comment he has written ? |
| A. | Functional Comment |
| B. | Code Hiding Comment |
| C. | Documentation Comment |
| D. | None of These |
| Answer» D. None of These | |
| 46. |
In March 1996, _______________ was released, featuring support for JavaScript. |
| A. | Netscape Navigator 1.0 |
| B. | Internet Explorer 2.0 |
| C. | Netscape Navigator 2.0 |
| D. | Internet Explorer 1.0 |
| Answer» D. Internet Explorer 1.0 | |
| 47. |
Group of JavaScript Statements is called as _________. |
| A. | Statement Block |
| B. | Group |
| C. | Cluster |
| D. | Code Block |
| Answer» B. Group | |
| 48. |
Which of the following function of Array object removes the first element from an array and returns that element? |
| A. | reverse() |
| B. | shift() |
| C. | slice() |
| D. | some() |
| Answer» C. slice() | |
| 49. |
Which of the following is not an logical operator ? |
| A. | && |
| B. | || |
| C. | ! |
| D. | | |
| Answer» E. | |
| 50. |
Variable name contain following type of characters -1. Alphabet2. Digits3. Underscore4. Special CharactersSelect the correct option. |
| A. | 3 4 2 |
| B. | 4 3 1 |
| C. | 1 2 3 4 |
| D. | 1 2 3 |
| Answer» E. | |