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JavaScript Questions & Answers – Augmentation of Classes | JavaScript MCQs

Questions
1 The four kinds of class members are ________
A Instance methods, Instance fields, Static method, Dynamic method
B Instance fields, Instance methods, Class fields, Class methods
C Instance fields, Non-instance fields, Dynamic methods, Global methods
D Global methods, Local methods, Dynamic methods, Static methods

Answer: Instance fields, Instance methods, Class fields, Class methods
2 Different kinds of the object involved in a class definition are ________
A Public object, Private object, Protected object
B Constructor object, Function object, Destructor object
C Constructor object, Prototype object, Instance object
D Instance method, Static object, Dynamic object

Answer: Constructor object, Prototype object, Instance object
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3 The object whose properties are inherited by all instances of the class, and properties whose values are functions behaving like instance methods of the class, is ________
A Instance object
B Constructor object
C Destructor object
D Prototype object

Answer: Prototype object
4 Which variables are used internally in object methods and are also globally visible?
A Object properties
B Variable properties
C Method properties
D Internal properties

Answer: Variable properties
5 The class that represents the regular expressions is ________
A RegExpObj
B RegExpClass
C RegExp
D StringExp

Answer: RegExp
6 The different variant of Date() constructor to create date object is/are ___________

i. new Date(date)

ii. new Date(milliseconds)

iii. new Date(date string)

iv. new Date(year, month, date[hour, minute, second, millisecond])

A i, ii and iii only
B ii, iii and iv only
C i, ii and iv only
D i, ii, iii and iv

Answer: ii, iii and iv only
7 Which is the correct code that returns a complex number that is the complex conjugate of this one?
A Complex.prototype.conj = function() { return new Complex(this.r, -this.i); };
B Complex.prototype.conj = function() { return Complex(this.r, -this.i); };
C Complex.prototype.conj = function() { return (this.r, -this.i); };
D Complex.prototype.conj = function() { new Complex(this.r, -this.i); };

Answer: Complex.prototype.conj = function() { return new Complex(this.r, -this.i); };
8 How can we make methods available on all objects?
A Object.add(methods)
B Object.methods(add)
C Object.add.methods(…)
D Object.prototype

Answer: Object.prototype
9 What is the procedure to add methods to HTMLElement so that they will be inherited by the objects that represent the HTML tags in the current document?
A HTMLElement.prototype(…)
B HTMLElement.prototype
C HTML.addmethods()
D HTML.elements(add)

Answer: HTMLElement.prototype
10 You can refresh the webpage in JavaScript by using ________
A window.reload
B location.reload
C window.refresh
D page.refresh

Answer: location.reload
11 What will be the output of the following JavaScript code? 
emp={id:102,name:"Shyam Kumar",salary:40000}  
   document.write(emp.id+" "+emp.name+" "+emp.salary);
A 102 4000 Shyam Kumar
B 102 4000
C 102 Shyam Kumar 40000
D 102 shyam kumar 40000

Answer: 102 4000
12 What will be the output of the following JavaScript code? 
function emp(id,name)
{  
    this.id=id;  
    this.name=name;    
}  
e=new emp(103,"Vimal Jaiswal");  
 
document.write(e.id+" "+e.name");
A 103 vimal jaiswal
B 103
C 103 Vimal Jaiswal
D Vimal jaiswal

Answer: 103 Vimal Jaiswal
13 What will be the output of the following JavaScript code? 
var emp=new Object();  
emp.name="Ravi Malik";  
emp.salary=50000;  
document.write("emp.name+" "+emp.salary);
A Ravi malik 5000
B Ravi Malik 50000
C Ravi malik
D 50000

Answer: Ravi Malik 50000
14 What will be the output of the following JavaScript code? 
function emp(name,salary)
{  
     this.name=name;  
     this.salary=salary;  
 
     this.changeSalary=changeSalary;  
     function changeSalary(otherSalary)
     {  
         this.salary=otherSalary;  
     }  
}  
e=new emp("Rahul",30000);  
e.changeSalary(45000);  
document.write("e.name+" "+e.salary);
A Rahul 30000
B Rahul
C Rahul 45000
D 45000

Answer: Rahul 45000
15 What will be the output of the following JavaScript code? 
const obj = { 10: 'arry', 21: 'barry', 23: 'carry' };  
console.log(Object.entries(obj)[2]);
A [“arry”, “10”]
B [“10”,”arry”]
C [“21”,barry”]
D [“23”,”carry”]

Answer: [“23”,”carry”]

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