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Basic JSON MCQ

1. What is supported by YAML but not supported by JSON?

Arrays

Null values

Comments

Nested

Answer

Correct Answer: Comments

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2. The JSON structure features nested objects and arrays. Sometimes the data containing these features exists in relational databases. How is the relational structure different that JSON?

It has a flat architecture.

It has a rewritable structure.

It has an array-only structure.

It has a table structure.

Answer

Correct Answer: It has an array-only structure.

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3. What characters are used to define an object?

{}

()

[]

Answer

Correct Answer: {}

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4. Which code is a 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"

Answer

Correct Answer: "variance": "-0.0823"

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5. What technique can you use to safely encode very large numbers?

Store the number as a string

Convert the number into an exponent.

Round the number to the nearest 10-digit number.

Split the number into smaller parts.

Answer

Correct Answer: Store the number as a string

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6. What is the only valid whitespace character within a string that does not require an escape character?

Line break

Space

Tab

Return

Answer

Correct Answer: Space

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7. When parsing JSON, "caching" is a method used to _.

Remove duplicate data from a server

Temporarily store data for faster access

Store excess information in chunks to be reviewed later

Clog up a web browser with useless information

Answer

Correct Answer: Temporarily store data for faster access

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8. If an object key contains spaces, how can you access its value in JavaScript?

Remove spaces from the key before accessing the value.

Use dot notation to access the value.

Use object key index to access the value.

Use bracket notation to access the value.

Answer

Correct Answer: Use bracket notation to access the value.

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9. How does JSON represent truth, falsity and nullness?

True, false, null

True, false

TRUE, FALSE, NULL

True, false, null

Answer

Correct Answer: True, false, null

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10. In JSON, a set of brackets ([]) is used to denote _, whereas curly braces ({}) denote _.

Arrays; objects

Objects; functions

Arrays; functions

Key/value pairs; arrays

Answer

Correct Answer: Arrays; objects

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11. What is the minimum number of values in an array?

Zero

One

Two

Three

Answer

Correct Answer: Zero

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12. How are the values in an array separated?

With right arrows

With colons

With semicolons

With commas

Answer

Correct Answer: With commas

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13. What JavaScript method is used to load JSON data?

JSON.ingest()

JSON.convert()

JSON.read()

JSON.parse()

Answer

Correct Answer: JSON.parse()

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14. What two nonnumerical characters can numbers contain?

Dash and dot

Dash and comma

Comma and exclamation point

Dot and comma

Answer

Correct Answer: Dash and dot

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15. Does JSON support signed numbers?

Yes, but only if they are enclosed in quotes

Only with integers

Yes

Answer

Correct Answer: No

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16. What is the recommended term used to refer to multiple resources?

A swarm

Multiple resources

A collection

A group

Answer

Correct Answer: Multiple resources

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17. What is the maximum number of key/value pairs that JSON supports?

10,000

1000

There is no defined limit.

1 million

Answer

Correct Answer: There is no defined limit.

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18. With what character should object keys be enclosed?

Answer

Correct Answer: ''

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19. Can you assume the order of keys in an object?

No, but you can sort the keys with JSON.sort().

Yes, object keys are always ordered alphabetically.

Yes, but only when the object is first parsed.

No, you can never assume object keys will be in order.

Answer

Correct Answer: No, but you can sort the keys with JSON.sort().

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20. What is the purpose of JSON?

To provide a simple way to serialize and deserialize data between different sources

To provide a way to store data for machine learning

To provide an archival solution for data warehousing

To provide a way for JavaScript to run other languages

Answer

Correct Answer: To provide a simple way to serialize and deserialize data between different sources

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

Answer

Correct Answer: ''

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22. What is the official MIME type for JSON?

Text/json

Text/javascript

Application/json

Data/json

Answer

Correct Answer: Application/json

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23. What characters are used to enclose an array?

[]

{}

" "

()

Answer

Correct Answer: {}

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

Reserialization

Nesting

Memorization

Minimization

Answer

Correct Answer: Nesting

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25. What values can arrays contain?

Only numbers

Any valid JSON value

Only strings and numbers

Only strings

Answer

Correct Answer: Any valid JSON value

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26. With which programming language is JSON best used?

Any language, as JSON is language agnostic.

Ruby

JavaScript

Python

Answer

Correct Answer: Any language, as JSON is language agnostic.

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27. How are values separated in JSON?

With brackets

With colons

With commas

With parentheses

Answer

Correct Answer: With commas

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28. 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

Answer

Correct Answer: "name": "bb-8"

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29. 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.

Answer

Correct Answer: JSON does not support comments.

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30. Which key format is valid JSON?

key: "value"

"key": "value"

key, "value"

'key': 'value'

Answer

Correct Answer: "key": "value"

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31. What are valid values in JSON?

Arrays, strings, numbers, true/false

Hashes, arrays, strings, numbers, booleans, null

Arrays, objects, lists, strings, numbers, booleans

Objects, arrays, strings, numbers, booleans, null

Answer

Correct Answer: Objects, arrays, strings, numbers, booleans, null

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32. What data structure do you use to encode ordered information?

List

Array

Struct

Indexed hash

Answer

Correct Answer: Array

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33. 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

Answer

Correct Answer: As a string in ISO 8601 format

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

Fractional and Transcendental

Infinity or Rational

Rational and Irrational

Infinity or NaN

Answer

Correct Answer: Infinity or NaN

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35. 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

Answer

Correct Answer: Replace any line breaks with \n

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36. What character separates keys from values?

Answer

Correct Answer: :

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37. With what character should key/value pairs be separated?

Colon

Space

Semicolon

Comma

Answer

Correct Answer: Colon

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38. 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

Answer

Correct Answer: "variance": "-0.0823"

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39. Which data format is a JSON schema written in?

Markdown

YAML

XML

JSON

Answer

Correct Answer: JSON

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

Data

Schemadata

Schematype

Type

Answer

Correct Answer: Type

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

128514

D83dde02

\uD83D\uDE02

😂

Answer

Correct Answer: \uD83D\uDE02

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42. 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

Answer

Correct Answer: "lastVisit": "null"

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43. 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.

Answer

Correct Answer: Leave the number as is.

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44. 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

Answer

Correct Answer: Null

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

Trailing commas

Trailing decimals

Whitespace

Leading zeroes

Answer

Correct Answer: Whitespace

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46. Which array is valid JSON?

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

[tatooine, hoth, dagobah]

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

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

Answer

Correct Answer: ["tatooine", "hoth", "dagobah"]

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47. How is a true boolean value represented in JSON?

TRUE

"true"

True

Answer

Correct Answer: True

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

XML

GRAPHQL

REST

SOAP

Answer

Correct Answer: XML

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49. 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.

Answer

Correct Answer: Because it's based on JavaScript.

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Basic JSON MCQ

1. What is supported by YAML but not supported by JSON?

2. The JSON structure features nested objects and arrays. Sometimes the data containing these features exists in relational databases. How is the relational structure different that JSON?

3. What characters are used to define an object?

4. Which code is a valid JSON equivalent of the key/value pair shown that also preserves the data type? variance: -0.0823

5. What technique can you use to safely encode very large numbers?

6. What is the only valid whitespace character within a string that does not require an escape character?

7. When parsing JSON, "caching" is a method used to _.

8. If an object key contains spaces, how can you access its value in JavaScript?

9. How does JSON represent truth, falsity and nullness?

10. In JSON, a set of brackets ([]) is used to denote _, whereas curly braces ({}) denote _.

11. What is the minimum number of values in an array?

12. How are the values in an array separated?

13. What JavaScript method is used to load JSON data?

14. What two nonnumerical characters can numbers contain?

15. Does JSON support signed numbers?

16. What is the recommended term used to refer to multiple resources?

17. What is the maximum number of key/value pairs that JSON supports?

18. With what character should object keys be enclosed?

19. Can you assume the order of keys in an object?

20. What is the purpose of JSON?

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

22. What is the official MIME type for JSON?

23. What characters are used to enclose an array?

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

25. What values can arrays contain?

26. With which programming language is JSON best used?

27. How are values separated in JSON?

28. How would you make the following string valid in JSON? "name": 'bb-8'

29. How should comments be formatted in JSON?

30. Which key format is valid JSON?

31. What are valid values in JSON?

32. What data structure do you use to encode ordered information?

33. How should a date value be stored in JSON?

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

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

36. What character separates keys from values?

37. With what character should key/value pairs be separated?

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

39. Which data format is a JSON schema written in?

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

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

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

43. How do you assign a number value in JSON?

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

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

46. Which array is valid JSON?

47. How is a true boolean value represented in JSON?

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

49. Why do so many APIs use JSON?

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