Intermediate JSON Structure - Mock Test

Question 1 of 20

True or False: You can nest JSON objects within arrays, and arrays within JSON objects.

Choose 1 answer

A. True

B. False

Question 2 of 20

Given the following JSON object, how would you access the value of 'city'?


{ "person": { "name": "John", "address": { "city": "New York", "zip": 10001 } } }

Choose 2 answers

A. person.address.city

B. person["address"]["city"]

C. person.city

D. person -> address -> city

Question 3 of 20

Which of the following represents a valid nested JSON array?

Choose 1 answer

A. [ { "name": "John", "age": 30 }, { "name": "Doe", "age": 25 } ]

B. { "names": [ "John", "Doe" ] }

C. [ [ 1, 2 ], [ 3, 4 ] ]

D. All of the above

Question 4 of 20

What is the correct way to represent an array of JSON objects, each containing a person's name and age?

Choose 1 answer

A. { "people": { "name": "John", "age": 30 }, { "name": "Jane", "age": 25 } }

B. { "people": [ { "name": "John", "age": 30 }, { "name": "Jane", "age": 25 } ] }

C. { "people": ( { "name": "John", "age": 30 }, { "name": "Jane", "age": 25 } ) }

D. { "people": "John", "Jane", 30, 25 }

Question 5 of 20

In the following JSON, how would you access the second item in the 'cars' array? { "cars": [ "BMW", "Audi", "Ford" ] }

Choose 1 answer

A. cars[2]

B. cars[1]

C. cars.second

D. cars -> Audi

Question 6 of 20

True or False: JSON arrays can contain multiple data types including strings, numbers, booleans, and objects.

Choose 1 answer

A. True

B. False

Question 7 of 20

Which of the following JSON structures represents an array of nested arrays?

Choose 2 answers

A. [ { "students": [ [ "John", "Math" ], [ "Jane", "Science" ] ] } ]

B. { "students": [ "John", "Jane" ] }

C. { "students": [ [ "John" ], [ "Jane" ] ] }

D. [ { "student": "John", "courses": [ "Math", "Science" ] } ]

Question 8 of 20

What will happen if you try to parse the following JSON? { "name": "John", "age": 30, "skills": [ "JavaScript", { "level": "expert" } ] }

Choose 1 answer

A. The JSON will parse successfully.

B. The JSON will throw a syntax error because of the nested object inside the array.

C. The JSON will parse, but the object will lose its nested structure.

D. The JSON will parse, but the array will be converted into a string.

Question 9 of 20

Which of the following is an example of JSON containing multiple data types?

Choose 1 answer

A. { "name": "Alice", "age": 28, "isStudent": false }

B. { "numbers": [ 1, 2, 3 ], "status": true, "value": null }

C. { "fruits": [ "apple", "banana" ], "price": 1.99 }

D. All of the above

Question 10 of 20

Which of the following is a valid JSON array containing nested objects?

Choose 1 answer

A. [ "item1", { "name": "John", "age": 30 }, "item3" ]

B. [ { "name": "John", "age": 30 }, { "name": "Jane", "age": 25 } ]

C. [ 1, 2, { "item": "apple" } ]

D. All of the above

Question 11 of 20

True or False: In a nested JSON object, an array can only contain primitive data types.

Choose 1 answer

A. True

B. False

Question 12 of 20

What is the best way to access the value of 'price' from the following JSON? { "products": [ { "name": "Laptop", "price": 1200 }, { "name": "Tablet", "price": 600 } ] }

Choose 1 answer

A. products.price

B. products[0].price

C. products[1]["price"]

D. Both B and C

Question 13 of 20

Which of the following JSON examples best represents a person's information, including their name, age, and an array of addresses?

Choose 1 answer

A. { "name": "John", "age": 30, "addresses": [ "123 Main St", "456 Oak St" ] }

B. { "name": "John", "age": 30, "addresses": { "home": "123 Main St", "work": "456 Oak St" } }

C. { "person": { "name": "John", "age": 30, "addresses": [ { "type": "home", "address": "123 Main St" }, { "type": "work", "address": "456 Oak St" } ] } }

D. { "name": "John", "addresses": [ { "home": "123 Main St" }, { "work": "456 Oak St" } ] }

Question 14 of 20

Which of the following data types are allowed in JSON arrays? (Select all that apply)

Choose 3 answers

A. Strings

B. Numbers

C. Objects

D. Functions

Question 15 of 20

What is the result of parsing this JSON object? { "skills": [ "coding", { "language": "JavaScript" } ] }

Choose 1 answer

A. A syntax error will occur.

B. The array will be ignored.

C. A JavaScript object will be returned with the 'skills' array containing a string and an object.

D. The object will be converted into an array.

Question 16 of 20

Which of the following JSON structures correctly represents a list of students, each with a name and an array of scores?

Choose 1 answer

A. { "students": { "name": "Alice", "scores": [90, 85, 88], "name": "Bob", "scores": [78, 82, 80] } }

B. { "students": [ { "name": "Alice", "scores": [90, 85, 88] }, { "name": "Bob", "scores": [78, 82, 80] } ] }

C. { "students": [ [ "Alice", 90, 85, 88 ], [ "Bob", 78, 82, 80 ] ] }

D. { "students": { "Alice": [90, 85, 88], "Bob": [78, 82, 80] } }

Question 17 of 20

What is the correct way to represent a JSON array of three different objects: a string, a number, and another JSON object?

Choose 1 answer

A. [ "Hello", 42, { "key": "value" } ]

B. [ { "greeting": "Hello" }, { "number": 42 }, { "object": { "key": "value" } } ]

C. [ { "string": "Hello", "number": 42, "object": { "key": "value" } } ]

D. { "array": "Hello", "array": 42, "array": { "key": "value" } }

Question 18 of 20

In the following JSON structure, what type is the 'friends' property? { "name": "John", "friends": [ "Mike", "Anna" ] }

Choose 1 answer

A. String

B. Array

C. Object

D. Boolean

Question 19 of 20

Which of the following is a valid way to represent a nested array of objects in JSON?

Choose 1 answer

A. [ [ { "name": "John" }, { "name": "Doe" } ], [ { "name": "Alice" }, { "name": "Bob" } ] ]

B. [ "John", "Doe", [ { "name": "Alice" }, { "name": "Bob" } ] ]

C. { "people": [ { "name": "John", "friends": [ { "name": "Doe" }, { "name": "Alice" } ] } ] }

D. All of the above

Question 20 of 20

How would you access the 'role' value in this nested structure? { "team": { "manager": { "name": "Alice", "role": "lead" }, "members": [ "John", "Jane" ] } }

Choose 1 answer

A. team.manager.role

B. team.role

C. team["manager"]["role"]

D. Both A and C

JSON Structure

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