JSON MCQ: JSON Multiple Choice Questions and Answers

JSON MCQ with answers and explanations for placement tests and job interviews. These solved JSON MCQs are useful for the campus placement for all freshers including Engineering Students, MCA students, Computer and IT Engineers, etc.

Our JSON MCQ (JSON Multiple Choice Questions ) focuses on various parts of the JSON open standard file format and data interchange format. It will be useful for anyone learning JSON Basics, Essentials, and/or Fundamentals. We will regularly update the quiz and most interesting thing is that questions come in a random sequence. So every time you will feel new questions.

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JSON MCQ

JSON MCQ: JSON Multiple Choice Questions and Answers

1 / 57

What technique can be used to represent complex objects with JSON?

reserialization

nesting

memorization

minimization

2 / 57

What characters are used to enclose an array?

[]

{}

()

3 / 57

Which JavaScript method converts a JavaScript value to Json?

JSON.parse()

JSON.stringify()

JSON.toString()

JSON.objectify()

4 / 57

Which element is added to the DOM to create a JSON-P request?

<json>

<meta>

5 / 57

Why do so many APIs use JSON?

Because it's object-based.

Because it's a simple and adaptable format for sharing data.

Because it's based on JavaScript.

Because it is derived from SGML.

6 / 57

Which number types are available in javascript but not supported in json?

Fractional and Transcendental

Infinity or Rational

Rational and Irrational

Infinity or NaN

7 / 57

What data structure do you use to encode ordered information?

list

array

struct

indexed hash

8 / 57

Which code uses the correct JSON syntax to encode the key/value pair shown?

accountNum: '000605802'

"accountNum": "00060504"

accountNum: "00060504"

"accountNum": 00060504

accountNum: 00060504

9 / 57

What does JSON with padding (JSON-P) use to make a request?

an <origin> element

a header request

the <script> element

the XMLHttpRequest object

10 / 57

Which reference to the Unicode character U+1F602 complies with the JSON standard?

128514

d83dde02

\uD83D\uDE02

😂

11 / 57

What is the official MIME type for JSON?

text/json

text/javascript

application/json

data/json

12 / 57

Which whitespace characters should be escaped within a string?

All whitespace is allowed.

double quotes, slashes new lines, and carriage returns

new lines and carriage returns only

double quotes only

13 / 57

Which is an invalid JSON value?

"'|=()(X 72()|/||*'"

"|=()(X 72()|/||*"

"|=()(X" "72()|/||*"

"\s()(X 72()|/||*"

14 / 57

How would you make the following string valid in JSON?

"name": 'bb-8'

name: "bb-8"

"name": 'bb-8'

"name": "bb-8"

"name": bb-8

15 / 57

What data type is encoded in the outermost component of the JSON shown?

{
  "result": [
    {
      "year": 2024
    },
    {
      "location": "unknown"
    }
  ]
}

number

array

string

object

16 / 57

Which date type is part of the JSON standard?

Boolean

map

promise

function

17 / 57

What data type is represented by the value of the key/value pair shown?

loggedIn: true

string

Boolean

number

object

18 / 57

Which key format is valid JSON?

key: "value"

"key": "value"

key, "value"

'key': 'value'

19 / 57

When building dynamic web applications using AJAX, developers originally used the ____ data format, which has since been replaced by JSON.

XML

GRAPHQL

REST

SOAP

20 / 57

Which is ignored by JSON but treated as significant by YAML?

trailing commas

trailing decimals

whitespace

leading zeroes

21 / 57

What values can arrays contain?

only numbers

any valid JSON value

only strings and numbers

only strings

22 / 57

Which data type is NOT part of JSON standard?

string

number

date

array

23 / 57

Which key name is used to specify properties that must be included for JSON to be valid?

important

base

core

required

24 / 57

Can trailing commas be used in objects and arrays?

yes

only if there is more than one item

only when arrays and objects contain more than 10 items

25 / 57

Which code uses the correct JSON syntax for encoding a key/value pair with a null value?

"lastVisit": "null"

lastVisit: null

"lastVisit": 0

"lastVisit": undefined

26 / 57

How is a true boolean value represented in JSON?

TRUE

"true"

true

27 / 57

What character separates keys from values?

28 / 57

Which term is commonly used to refer to converting data to JSON?

unpacking

serialization

deserialization

parsing

29 / 57

Which JavaScript method converts a Json to JavaScript value?

JSON.parse()

JSON.stringify()

JSON.toString()

JSON.objectify()

30 / 57

By convention, what name is used for the first key in a JSON schema?

schema

$schema

JsonSchema

JSONschema

31 / 57

How do you store several paragraphs of text as a string in JSON?

Escape all whitespaces expect space characters.

Escape line breaks.

Escape paragraphs.

Remove all whitespaces

32 / 57

Which value is supported in the JSON specifications?

undefined

infinity

NaN

null

33 / 57

How do you assign a number value in JSON?

Escape the number with a backslash.

Enclose the number in double quotes.

Enclose the number in single quotes.

Leave the number as is.

34 / 57

What character do you specify before a JSON control character when you want to use that control characters as a literal part of a string?

{

35 / 57

What data type is encoded in the outermost component of the JSON shown?

[
  {
    "year": 2024
  },
  {
    "location": "unknown"
  }
]

object

array

number

string

36 / 57

With what character should key/value pairs be separated?

colon

space

semicolon

comma

37 / 57

Which data format is a JSON schema written in?

markdown

YAML

XML

JSON

38 / 57

How should comments be formatted in JSON?

Wrap the comments in single quotes and place it at the bottom of the file.

Wrap the comments in double parentheses.

Escape comments by placing two slashes at the start of the comment.

JSON does not support comments.

39 / 57

Which code uses the correct JSON syntax for a key/Value pair containing a string?

"largest": "blue whale"

largest: 'blue whale'

'largest': 'blue whale'

largest: "blue whale"

40 / 57

Which code is valid JSON equivalent of the key/value pair shown that also preserves the data type?

"variance": "-0.0823"

variance: "-0.0823"

"variance": "-0.0823"

variance: -0.0823

41 / 57

How do you encode a date in JSON?

Convert the date to UTC and enclose in quotes.

Encode the date as string using the ISO-8601 date format.

Wrap the date in double quotes.

Add a "date" key to your object and include the date as string.

42 / 57

Which is supported by YAML but not supported by JSON?

nested

comments

arrays

null values

43 / 57

What tool might you use to validate your JSON?

JSONLint

ValidateJSON

JSONFiddle

TextEdit

44 / 57

Which key name is used to specify data type in a JSON schema?

data

schemadata

schematype

type

45 / 57

If a string contains line breaks, what should you do?

Wrap line breaks in single quotation marks

Make no changes, because whitespace is allowed

Replace any line breaks with \r

Replace any line breaks with \n

46 / 57

If you need to store the loggedIn status of a user in JSON as a boolean, what is the correct syntax?

"loggedIn": (true)

loggedIn: "true"

"loggedIn": true

loggedIn: {true}

47 / 57

How should a date value be stored in JSON?

As a string with quotes

As a string without quotes

As a string in ISO 8583 format

As a string in ISO 8601 format

48 / 57

With which programming language is JSON best used?

any language, as JSON is language agnostic.

Ruby

JavaScript

Python

49 / 57

What's wrong with this JSON object?

{
  "series": "Star Trek",
  "episodes": "The Trouble with Tribbles"
}

Key/value pairs should be separated by semicolons.

Keys should be enclosed with double quotes.

Key/value pairs should always have a trailing comma.

Keys and values should be enclosed with single quotes.

50 / 57

How are values separated in JSON?

with brackets

with colons

with commas

with parentheses

51 / 57

When you need to set the value of a key in JSON to be blank, what is the correct syntax for the empty value?

FALSE

null

52 / 57

Which code is a valid JSON equivalent of the key/value pair shown that also preserves the data type? constant: 6.022E23

"constant": "6.022E23"

"constant": "6\.022\E23"

constant: 6.022E23

constant: "6.022E23"

53 / 57

What character cannot be part of string within JSON without additional formatting?

54 / 57

What characters denote strings in JSON?

double quotes

smart (curly) quotes

single or double quotes

single quotes

55 / 57

Transferring JSON information from client to server and back again often includes HTTP requests. Match each method with the best choice describing its use.

1.Sends data to specific server to create or update information.
2.Sends data to specific server to create or update information without the risk of creating the resource more than once.
3.Previews what the GET request response might be without the body of the text.
4.Learns the communication channels used by the target source.
5.Requests information from a specific source.
6.Removes information.

1.POST 2.DELETE 3.OPTIONS 4.HEADER 5.GET 6.PUT

1.POST 2.PUT 3.HEADER 4.OPTIONS 5.GET 6.DELETE

1.POST 2.DELETE 3.OPTIONS 4.HEADER 5.GET 6.PUT

1.POST 2.PUT 3.HEADER 4.OPTIONS 5.GET 6.DELETE

56 / 57

Which array is valid JSON?

['tatooine', 'hoth', 'dagobah']

[tatooine, hoth, dagobah]

["tatooine", "hoth", "dagobah",]

["tatooine", "hoth", "dagobah"]

57 / 57

What’s wrong with this JavaScript?

JSON.parse({"first": "Sarah", "last": "Connor"}) ;

JSON should be wrapped with curly braces.

JSON.parse() is missing an argument.

The value supplied to JSON.parse() is not a string.

Nothing is wrong with it.

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JSON MCQ: JSON Multiple Choice Questions and Answers

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