ICAS Digital Technologies 5

Question 1

A student notices her program sometimes gives wrong answers because of rounding decimal numbers. This is MOST likely caused by:

Accepted Answer

Floating-point precision limitations

Answer

Floating-point numbers cannot represent every decimal value exactly in binary, which can cause small rounding errors in calculations.

Question 2

Which of the following sorting algorithms repeatedly finds the minimum element and places it at the beginning?

Accepted Answer

Selection sort

Answer

Selection sort scans the unsorted portion of the list, selects the smallest element, and swaps it into its correct position at the front.

Question 3

In cybersecurity, what does '2FA' stand for?

Accepted Answer

Two-Factor Authentication

Answer

2FA (Two-Factor Authentication) requires users to provide two different types of verification before accessing an account, increasing security.

Question 4

Which of the following BEST describes an algorithm?

Accepted Answer

A step-by-step set of instructions to solve a problem

Answer

An algorithm is a finite, ordered set of well-defined instructions designed to perform a task or solve a problem.

Question 5

What is the main advantage of using a 'relational database' over a flat-file database?

Accepted Answer

It links related data across multiple tables, reducing duplication

Answer

A relational database organizes data into linked tables, which eliminates redundancy and makes it easier to query and maintain large datasets.

(ICAS) ICAS Practice Test