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.
| 51. |
Variables declared inside function are visible _______________. |
| A. | Inside the function in which it is declared |
| B. | to all the functions |
| C. | All the scripts inside save JS File |
| D. | None of these |
| Answer» B. to all the functions | |
| 52. |
JavaScript code contain sequence of ___________. |
| A. | HTML Tags |
| B. | Method Calls |
| C. | Executable Statements |
| D. | All of these |
| Answer» E. | |
| 53. |
Local Variables are Destroyed as soon as ______________. |
| A. | user closes the browser |
| B. | page gets completely loaded |
| C. | control comes outside the method |
| D. | None of these |
| Answer» D. None of these | |
| 54. |
Which of the following is a server-side Java Script object? |
| A. | Function |
| B. | File |
| C. | FileUpload |
| D. | Date |
| Answer» C. FileUpload | |
| 55. |
Which attribute is used to specifies that the script is executed when the page has finished parsing (only for external scripts) ? |
| A. | type |
| B. | defer |
| C. | async |
| D. | parse |
| Answer» C. async | |
| 56. |
Executable single line of Script is called as _________________. |
| A. | Statement in JavaScript |
| B. | Breakpoint in JS |
| C. | Line in JS |
| D. | None of these |
| Answer» B. Breakpoint in JS | |
| 57. |
Microsoft Developed a compatible dialect of JavaScript called _____________. |
| A. | JScript |
| B. | MS JavaScript |
| C. | MJavaScript |
| D. | Advanced JavaScript |
| Answer» B. MS JavaScript | |
| 58. |
We can declare all type of variables in JavaScript with the keyword _____________. |
| A. | var |
| B. | obj |
| C. | jvar |
| D. | None of these |
| Answer» B. obj | |
| 59. |
+Infinity in JS gets added with +Infinity then output of the code will be |
| A. | |
| B. | +Infinity |
| C. | -Infinity |
| D. | Null |
| Answer» C. -Infinity | |
| 60. |
-Infinity in JS gets added with -Infinity then output of the code will be |
| A. | +Infinity |
| B. | |
| C. | -Infinity |
| D. | None of the above |
| Answer» D. None of the above | |
| 61. |
State the correct place of JS Code inside HTML - |
| A. | Inside Body |
| B. | Inside Head |
| C. | Inside Single JavaScript File |
| D. | All of these |
| Answer» E. | |
| 62. |
JS Comment can be used for following purposes - |
| A. | to Hide Non-usable line |
| B. | to Hide Non-usable Multiline Code |
| C. | used for Documentation |
| D. | All of these |
| Answer» E. | |
| 63. |
Comment Statement is _________________ type of statement. |
| A. | Executive |
| B. | Non Important |
| C. | Non Executable |
| D. | Non Usable |
| Answer» D. Non Usable | |
| 64. |
During addition of two numbers , suppose one of the number is NaN then output of the following code will be ? |
| A. | |
| B. | Zero |
| C. | Infinite |
| D. | Null |
| Answer» B. Zero | |
| 65. |
____________ is used to assign value to the variable. |
| A. | Assignment Statement in JavaScript |
| B. | Declaration Statement |
| C. | Conditional Statement |
| D. | Executable Statement |
| Answer» B. Declaration Statement | |
| 66. |
Which of the following is considered as End of Single line comment ? |
| A. | End of Line |
| B. | Semicolon |
| C. | End of Statement |
| D. | "*/" Symbol |
| Answer» B. Semicolon | |
| 67. |
Which of the following function of String object returns a number indicating the Unicode value of the character at the given index? |
| A. | charAt() |
| B. | charCodeAt() |
| C. | concat() |
| D. | indexOf() |
| Answer» C. concat() | |
| 68. |
Single Line Comment in JavaScript Starts with _________ Symbol. |
| A. | "\\" |
| B. | "//" |
| C. | "$$" |
| D. | "#" |
| Answer» C. "$$" | |
| 69. |
If the values on either side of '+' operator are numerical values then ___________. |
| A. | values are concatenated together |
| B. | values are added together |
| C. | no effect |
| D. | None of These |
| Answer» C. no effect | |
| 70. |
var var1 = "Pritesh";Above variable can store value of type - |
| A. | Integer |
| B. | String |
| C. | Any Type |
| D. | None of these |
| Answer» C. Any Type | |
| 71. |
Which of the following is a valid type of function javascript supports? |
| A. | named function |
| B. | anonymous function |
| C. | Both of the above |
| D. | None of the above |
| Answer» D. None of the above | |
| 72. |
JavaScript contains a _________________ that assigns a value to a variable based on some condition. |
| A. | Bitwise Operator |
| B. | Logical Operator |
| C. | Assignment operator |
| D. | Conditional operator |
| Answer» E. | |
| 73. |
Adding String and Integer always results in _________. |
| A. | Character |
| B. | String |
| C. | Integer |
| D. | None of these |
| Answer» C. Integer | |
| 74. |
We use _______ style comment to prevent showing Java Script as Content in the old browsers. |
| A. | JS |
| B. | CSS |
| C. | HTML |
| D. | C |
| Answer» D. C | |
| 75. |
"++" is __________ type of operator. |
| A. | Ternary |
| B. | Binary |
| C. | Unary |
| D. | None of these |
| Answer» D. None of these | |
| 76. |
JavaScript Statements are executed by ________ . |
| A. | Server |
| B. | JVM |
| C. | Compiler |
| D. | Browser |
| Answer» E. | |
| 77. |
Which built-in method returns the calling string value converted to upper case? |
| A. | toUpperCase() |
| B. | toUpper() |
| C. | changeCase(case) |
| D. | None of the above. |
| Answer» B. toUpper() | |
| 78. |
Which of the following is correct about JavaScript? |
| A. | JavaScript is a lightweight, interpreted programming language. |
| B. | JavaScript has object-oriented capabilities that allows you to build interactivity into otherwise static HTML pages. |
| C. | The general-purpose core of the language has been embedded in Netscape, Internet Explorer, and other web browsers. |
| D. | All of the above. |
| Answer» E. | |
| 79. |
Which of the following is the correct syntax to print a page using JavaScript? |
| A. | window.print(); |
| B. | browser.print(); |
| C. | navigator.print(); |
| D. | document.print(); |
| Answer» B. browser.print(); | |
| 80. |
Which of the following type of variable is visible only within a function where it is defined? |
| A. | global variable |
| B. | local variable |
| C. | Both of the above. |
| D. | None of the above. |
| Answer» C. Both of the above. | |
| 81. |
Which of the following is true about variable naming conventions in JavaScript? |
| A. | You should not use any of the JavaScript reserved keyword as variable name. |
| B. | JavaScript variable names should not start with a numeral (0-9). |
| C. | Both of the above. |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 82. |
Which of the following function of String object causes a string to be displayed as struck-out text, as if it were in a strike tag? |
| A. | sup() |
| B. | small() |
| C. | strike() |
| D. | sub() |
| Answer» D. sub() | |
| 83. |
Which of the following function of Number object returns the number's value? |
| A. | toString() |
| B. | valueOf() |
| C. | toLocaleString() |
| D. | toPrecision() |
| Answer» C. toLocaleString() | |
| 84. |
Which of the following function of String object returns the index within the calling String object of the first occurrence of the specified value? |
| A. | substr() |
| B. | search() |
| C. | lastIndexOf() |
| D. | indexOf() |
| Answer» E. | |
| 85. |
WHAT_IS_THE_PURPOSE_OF_THE_METHOD_PAR()??$ |
| A. | Makes the text vertical |
| B. | Makes the text horizontal |
| C. | Makes the text diagonal |
| D. | None of the mentioned |
| Answer» C. Makes the text diagonal | |
| 86. |
WHICH_IS_THE_METHOD_USED_TO_DRAW_A_BAR_PLOT??$ |
| A. | bar_plot() |
| B. | plot(bar) |
| C. | barplot() |
| D. | plotbar() |
| Answer» D. plotbar() | |
| 87. |
What is the purpose of the method par()?$ |
| A. | Makes the text vertical |
| B. | Makes the text horizontal |
| C. | Makes the text diagonal |
| D. | None of the mentioned |
| Answer» C. Makes the text diagonal | |
| 88. |
Which is the method used to draw a bar plot? |
| A. | bar_plot() |
| B. | plot(bar) |
| C. | barplot() |
| D. | plotbar() |
| Answer» D. plotbar() | |
| 89. |
Which of the following are methods used to save charts? |
| A. | pdf() |
| B. | jpeg() |
| C. | bmp() |
| D. | all of the mentioned |
| Answer» E. | |
| 90. |
Which is the method used to save chart as a ps file? |
| A. | ps() |
| B. | postscript() |
| C. | script() |
| D. | post(script) |
| Answer» C. script() | |
| 91. |
How to save chart as a Window metafile? |
| A. | metafile() |
| B. | win.metafile() |
| C. | file() |
| D. | metawin() |
| Answer» C. file() | |
| 92. |
What is the purpose of the method symbols in R? |
| A. | Draw symbols |
| B. | Draw other shapes |
| C. | Draw symbols and other shapes |
| D. | None of the mentioned |
| Answer» C. Draw symbols and other shapes | |
| 93. |
Which of the following is the initial function used to create a bubble chart natively in R? |
| A. | init() |
| B. | chart(bubble) |
| C. | symbols() |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 94. |
What is the need for bubble charts? |
| A. | Represent 2D data |
| B. | Represent 3D data |
| C. | Represent 2D and 3D data |
| D. | None of the mentioned |
| Answer» C. Represent 2D and 3D data | |
| 95. |
How many parameters does the method plot() accept? |
| A. | 6 |
| B. | 7 |
| C. | 8 |
| D. | 9 |
| Answer» E. | |
| 96. |
What is the purpose of the method plot()? |
| A. | Displays symbols |
| B. | Displays charts |
| C. | Displays symbols and charts |
| D. | None of the mentioned |
| Answer» C. Displays symbols and charts | |