CompTIA Tech+ FC0-U71 Book

The correct answer is A. CPU. The CPU, or central processing unit, is the processor that controls and directs computer activities. The operating system provides instructions, and the CPU processes them. An HDD stores data, RAM temporarily stores active data and instructions, and a NIC provides network connectivity. Only the CPU executes instructions.

Exact Extract/Reference: The CompTIA Tech+ Study Guide states that the role of the CPU is “to control and direct all the activities of the computer” and that the terms “processor” and “CPU” are interchangeable. It also explains that the processor “just does what it’s instructed to do.”

Gaming monitors are often described using refresh rates, which are measured in hertz (Hz), often specified in MHz for related processing frequencies. The CompTIA ITF+ FC0-U71 Official Study Guide states:

" Monitor refresh rate refers to how many times per second the screen updates, usually measured in Hz. "

" MHz (megahertz) is used for various frequencies, including GPU and monitor refresh processing. "

GPU and RAM refer to hardware components, TB measures storage, and MHz relates to the frequency, applicable for monitor performance metrics.

A byte consists of exactly 8 bits. Bits (binary digits) are the smallest unit of data, and eight of them grouped together form one byte, which is used to represent characters and numbers in digital systems.

“A byte is made up of 8 bits and is the standard unit of data used to represent information such as characters in computing.” — CompTIA ITF+ Fundamentals

Correct answer: C

In the database schema shown in the images, there are four rows (excluding the header row) representing data entries for four people (John, Jane, Allison, and Anna).

Each row represents a record in the database table, also known as a tuple. The term record refers to a complete set of fields (ID, Name, and Age) for one entry. So, counting the four rows:

John

Jane

Allison

Anna

That makes a total of 4 records in the database schema.