Robert Half Assessment Test IT and Programming Concepts 4

Question 1

What does 'polymorphism' mean in object-oriented programming?

Accepted Answer

Objects of different types can be treated through a shared interface, with each responding differently

Answer

Polymorphism allows different classes to be used interchangeably through a common interface, each implementing behavior in its own way.

Question 2

Which HTTP status code indicates a successful request?

Accepted Answer

200

Answer

HTTP status code 200 (OK) means the request was successful and the server returned the expected response.

Question 3

What is the main advantage of using a virtual machine (VM)?

Accepted Answer

It allows multiple isolated operating systems to run on one physical machine

Answer

VMs use a hypervisor to run multiple isolated OS instances on one physical host, improving resource utilization and flexibility.

Question 4

In CSS, what does the 'box model' describe?

Accepted Answer

The layout model that includes content, padding, border, and margin around elements

Answer

The CSS box model defines how the content, padding, border, and margin of an element combine to determine its total size and spacing.

Question 5

What is a 'primary key' in a relational database?

Accepted Answer

A unique identifier for each row in a table

Answer

A primary key uniquely identifies each record in a table and cannot contain NULL values or duplicates.

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