CodeSignal Technical Assessment Domain-Specific Knowledges 5

Question 1

In object-oriented programming, what is the difference between composition and inheritance?

Accepted Answer

Composition models 'has-a' relationships by embedding objects; inheritance models 'is-a' relationships via subclassing

Answer

Inheritance shares code at compile time; composition at runtime only

Answer

Composition requires interfaces; inheritance does not

Answer

They are interchangeable and differ only in syntax

Question 2

Which tree traversal visits nodes in ascending order for a Binary Search Tree?

Accepted Answer

In-order (left, root, right)

Answer

Pre-order (root, left, right)

Answer

Post-order (left, right, root)

Answer

Level-order (BFS)

Question 3

Which HTTP caching header tells the browser the maximum number of seconds a response may be cached before revalidation?

Accepted Answer

Cache-Control: max-age

Answer

Expires

Answer

ETag

Answer

Last-Modified

Question 4

What is the output of `print(0.1 + 0.2 == 0.3)` in Python?

Accepted Answer

False

Answer

True

Answer

TypeError

Answer

None

Question 5

In software testing, what does 'code coverage' measure?

Accepted Answer

The percentage of source code lines or branches exercised by a test suite

Answer

The number of defects found per line of code

Answer

How quickly tests execute relative to the codebase size

Answer

Whether tests were written before or after the implementation

Question 6

Which data structure is most appropriate for implementing a priority queue?

Accepted Answer

Binary Heap

Answer

Doubly Linked List

Answer

Hash Table

Answer

Circular Buffer

Question 7

In OAuth 2.0, what is the purpose of an 'access token'?

Accepted Answer

It is a credential that grants the bearer limited access to protected resources on behalf of the resource owner

Answer

It proves the identity of the authorization server to clients

Answer

It stores the user's password in an encrypted form

Answer

It uniquely identifies the OAuth client application