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JavaScript Questions & Answers – Modules in JavaScript | JavaScript MCQs

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Free download in PDF JavaScript Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) The functions provide() and require() of Dojo toolkit and Google’s Closure library are used for ___________
[A] declaring and loading modules
[B] declaring functions
[C] declaring modules
[D] loading modules
Answer: declaring and loading modules
(2) The maximum number of global symbols a module can define is ____________
[A] 2
[B] 3
[C] 1
[D] 4
Answer: 1

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(3) To define each of the set classes as a property of the sets object (namespace) for the module, the statement is
[A] sets = sets.AbstractEnumerableSet.extend();
[B] sets.SingletonSet = sets.AbstractEnumerableSet.extend(…);
[C] sets.SingletonSet = sets.extend(…);
[D] sets = sets.extend(…);
Answer: sets.SingletonSet = sets.AbstractEnumerableSet.extend(…);
(4) What will be the efficiency quotient of the following JavaScript statements? 
var Set = sets.Set;
var s = new Set(1,2,3);
[A] The programmer imports at once the frequently used values into the global namespace
[B] There is no efficiency quotient, the programmer tries to make it inefficient
[C] The programmer needs to import the Sets everytime he wants to use it
[D] the programmer imports the set everytime the statement is encountered
Answer: The programmer imports at once the frequently used values into the global namespace
(5) The scope of a function is also called as ________
[A] Predefined function
[B] Module function
[C] Public function
[D] Private function
Answer: Module function
(6) Modules that have more than one item in their API can ________
[A] Assign itself to a global variable
[B] Invoke another module of the same kind
[C] Return a namespace object
[D] Invoke another module of the same kind
Answer: Return a namespace object
(7) The provides() function and the exportsobject are used to _________
[A] Register the module’s API and Store their API
[B] Call the modules api
[C] Store the module’s API
[D] Register the modules api
Answer: Register the module’s API and Store their API
(8) What could be achieved by running the JavaScript code snippet below? 
var sets = com.davidflanagan.collections.sets;
[A] Importing a single module
[B] Importing a module partially
[C] Importing a namespace
[D] Importing the entire module
Answer: Importing the entire module
(9) The properties() method is a ________
[A] Enumerable method
[B] Non-enumerable method
[C] Operational method
[D] calling method
Answer: Non-enumerable method
(10) What can be done in order to avoid the creation of global variables in JavaScript?
[A] To use a method that defines all the variables
[B] To use an object that has the reference to all the variables
[C] To use an object as its namespace
[D] To use global functions
Answer: To use an object as its namespace
(11) What will be the output of the following JavaScript code?
[A] 0.0123
[B] 12300
[C] Error
[D] Undefined
Answer: 12300
(12) What will be the output of the following JavaScript code?

[A] 3
[B] true
[C] false
[D] error
Answer: true
(13) What will be the output of the following JavaScript code?

[A] 3
[B] true
[C] false
[D] error
Answer: false
(14) What will be the output of the following JavaScript code?

[A] True
[B] False
[C] Error
[D] Undefined
Answer: False
(15) What will be the output of the following JavaScript code?

[A] true
[B] false
[C] error
[D] undefined
Answer: false

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