Javascript (JS) Object MCQ

This section focuses on the "Javascript Object" of the Javascript. These Multiple Choice Questions (mcq) should be practiced to improve the Javascript skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

1. What will be printed in the console on execution of the following JS code:
var array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
var myArr= array.filter(v => v % 3 === 0);

console.log(myArr);

A. myArr
B. [3, 6, 9, 12, 15]
C. [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
D. [1, 2, 4, 5, 7, 8, 10, 11, 13, 14]

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2. What will be printed in the console on execution of the following JS code:
var array = [2, 4, 6, 7, 8, 10];
var myArr= array.filter(v => v / 2 === 0);

console.log(myArr);

A. myArr
B. [2, 4, 6, 7, 8, 10]
C. [2, 4, 6, 8, 10]
D. [7]

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3. What will be printed in the console on execution of the below code?
var materials = [
'Hydrogen',
'Helium',
'Lithium',
'Beryllium'
];

console.log(materials.map (material => material.length));

A. [8, 6, 7, 9]
B. 4
C. [4]
D. 8, 6, 7, 9

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4. What will be printed in the console on execution of the below code?
var materials = [
'Table',
'Chair',
'Boxes',
'Press'
];

console.log(materials.map (material => material.length));

A. [5,5,5,5]
B. [5]{4}
C. [5]
D. Both A and B

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5. what will be the output of below code?
var val = "JavaScript String"
splittedVal = val.split('a',2)
console.log(splittedVal);

A. [ 'J', 'v' ]
B. [ 'J' ,'v','Script']
C. [ 'J', 'v', 'Script String' ]
D. [ 'JavaScript String' ]

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6. what will be the output of below code?
NOTE: The code is executed on 2019-5-9
var todaysDate = new Date()
console.log( todaysDate.toLocaleString() );

A. 2019-05-09T09:29:53.181Z
B. 2019-5-9
C. 15:00:34
D. 2019-5-9 15:02:35

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7. ........ serializes only the enumerable own properties of an object.

A. JSON.Parse()
B. JSON.Stringify()
C. JSON.Null()
D. JSON.Objectify()

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8. Object ......... is the process of converting an object’s state to a string from which it can later be restored.

A. prototype
B. class
C. serialization
D. extensible

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9.  If para1 is the DOM object for a paragraph, what is the correct syntax to change the text within the paragraph?

A. "New Text"?
B. para1.value="New Text";
C. para1.firstChild.nodeValue= "New Text";
D. para1.nodeValue="New Text";

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10. what will be the output of below code?
const event = new Date(Date.UTC(2012, 11, 20, 3, 0, 0));
console.log (event.toLocaleString('en-IN', { timeZone: 'UTC' }));

A. 20/12/2012, 3:00:00
B. 12/20/2012, 3:00:00
C. 20/12/2012, 3:00:00 am
D. 2012/12/20, 3:00:00 am

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11. A programming language can be called object-oriented if it provides ________ basic capabilities to developers

A. 1
B. 2
C. 3
D. 4

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12. The capability to store one object inside another object known as?

A. Encapsulation
B. Aggregation
C. Inheritance
D. Polymorphism

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13. The syntax for adding a property to an object is?

A. objectProperty == propertyValue;
B. objectProperty = propertyValue;
C. objectName.objectProperty = propertyValue;
D. objectName.objectProperty == propertyValue;

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14. The ________ operator is used to create an instance of an object.

A. this
B. self
C. find
D. new

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15. JavaScript provides a special constructor function called Object() to build the object.

A. TRUE
B. FALSE
C. Can be true or false
D. Can not say

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