Pre Assessment backend

Which of the following data types is NOT commonly used in backend programming?

• string
• boolean
• style
• number

What is the purpose of using loops in programming?

• To store data
• To manage files
• To define variables
• To repeat a block of code multiple times

Which keyword is used to define a function in JavaScript?

• func
• def
• function
• create

Which of the following is a valid conditional statement in JavaScript?

• if (x > 0) { ... }
• while (x > 0) { ... }
• for (let i = 0; i < 10; i++) { ... }
• switch x:

How do you declare a constant in JavaScript?

• var
• let
• const
• static

Which data structure uses a key-value pair for storing data?

• Array
• Object
• linked list
• stacked

Which of these data structures works on the principle of Last In, First Out (LIFO)?

• Queue
• stack
• array
• set

What is the time complexity of accessing an element in an array by index?

• O(1)
• O(n)
• O(log n)
• O(n^2)

Which data structure is commonly used for implementing a queue?

• Stack
• Linked list
• Tree
• Hash table

What is a linked list?

• A collection of elements with a fixed size
• ) A sequence of nodes where each node points to the next node
• A data structure that uses key-value pairs
• A stack-based structure