72 JavaScript MCQ Questions in english

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72 JavaScript MCQ Questions in english हिन्दी

44. The names of the "function" and "var" are:

A. Keywords

B. Data types

C. Declaration statements

D. Prototypes

43. What happens if an interpreter runs into an empty statement:

A. Shows a warning

B. Prompts to complete the statement

C. Throws an error

D. Ignores the statements

42. What does a block of statements mean in JavaScript?

A. Conditional block

B. block that combines a number of statements into a single compound statement

C. both conditional block and a single statement

D. block that contains a single statement

41. Which of the following doesn't constitute a JavaScript error?

A. Missing of Bracket

B. Division by zero

C. Syntax error

D. Missing of semicolons

40. Which of the following properties is the one that JS faults cause to be triggered?

A. onclick

B. onerror

C. onmessage

D. onexception

39. 22. What will the following Java programme produce?

A. www.sanfoundry.com

B. https://www.sanfoundry.com/javamcq

C. sanfoundry

D. sanfoundry.com

38. which is not a framework?

A. JavaScript .NET

B. JavaScript

C. Cocoa JS

D. jQuery

37. Why are JS event handlers necessary?

A. Allows JavaScript code to alter the behaviour of windows

B. Adds innerHTML page to the code

C. Change the server location

D. Performs handling of exceptions and occurrences

36. Which of the subsequent operations and/or procedures does JavaScript utilise in place of == and!=?

A. JavaScript uses equalto()

B. JavaScript uses equals() and notequals() instead

C. JavaScript uses bitwise checking

D. JavaScript uses === and !== instead

35. 21. Of the following, which is not a Java Profiler?

A. JProfiler

B. Eclipse Profiler

C. JVM

D. JConsole

34. Why is a JavaScript Engine necessary?

A. Both Compiling & Interpreting the JavaScript

B. Parsing the javascript

C. Interpreting the JavaScript

D. Compiling the JavaScript

33. 20. Which of the following describes the superclass of each Java class?

A. ArrayList

B. Abstract class

C. Object class

D. String

32. What fundamental differences exist between Java and JavaScript?

A. Functions are considered as fields

B. Functions are values, and there is no hard distinction between methods and fields

C. Variables are specific

D. There is no difference

31. 19. Which of the following keywords is used in Java to define interfaces?

A. intf

B. Intf

C. interface

D. Interface

30. What kind of scoping method does JavaScript employ?

A. Sequential

B. Segmental

C. Lexical

D. Literal

29. 18. Which of these is a Java selection statement?

A. break

B. break

C. for()

D. if()

28. Which of the following best describes what takes place when JavaScript software is created on a Unix machine?

A. will work perfectly well on a Windows Machine

B. will be displayed as JavaScript text on the browser

C. will throw errors and exceptions

D. must be restricted to a Unix Machine only

27. 17. In Java, what exception is raised when memory is exhausted?

A. MemoryError

B. OutOfMemoryError

C. MemoryOutOfBoundsException

D. MemoryFullException

26. 16. What does the term "compiled Java classes" mean?

A. .txt

B. .js

C. .class

D. .java

25. A JavaScript Code Snippet can be called using which of the following?

A. Function/Method

B. Preprocessor

C. Triggering Event

D. RMI

24. 15. What will the following Java code snippet produce?

A. The snippet compiles and runs but does not print anything

B. The snippet compiles, runs and prints 0

C. The snippet compiles, runs and prints 1

D. The snippet does not compile

23. The primary entry point for all client-side JavaScript features and APIs is which of the following objects?

A. Position

B. Window

C. Standard

D. Location

22. 14. What does Java's truncation mean?

A. Floating-point value assigned to a Floating type

B. Floating-point value assigned to an integer type

C. Integer value assigned to floating type

D. Integer value assigned to floating type

21. Where can I get HTML documents with client-side JavaScript code embedded?

A. A URL that uses the special javascript:code

B. A URL that uses the special javascript:protocol

C. A URL that uses the special javascript:encoding

D. A URL that uses the special javascript:stack

20. 13. In Java programming, which of the following is a form of polymorphism?

A. Multiple polymorphism

B. Compile time polymorphism

C. Multilevel polymorphism

D. Execution time polymorphism

19. Which of the following are not data types for java script?

A. Null type

B. Undefined type

C. Number type

D. All of the mentioned

18. 12. Which of the following lines of Java code has an error?

A. b cannot contain value 50

B. b cannot contain value 100, limited by its range

C. No error in this code

D. * operator has converted b * 50 into int, which can not be converted to byte without casting

17. 11. What will the following Java programme produce?

A. Compilation error

B. Runtime error

C. 5 6 5 6

D. 5 6 5

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