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Computer organization basics: A(n) ________ is not a functional unit of a computer.

Difficulty: Easy

input unit
memory unit
modem
control unit
arithmetic-logic unit

Correct Answer: modem

Explanation:

Introduction / Context:
Functional units of a basic computer are the standardized architectural blocks that enable input, processing, storage, and control. This question checks recognition of what is and is not a core functional unit.

Given Data / Assumptions:

Standard textbook model: input, output, memory, ALU, and control.
We must choose the item that is not one of these core units.

Concept / Approach:
The classic Von Neumann view includes input unit, output unit, memory unit, ALU, and control unit. A modem is an external communication device/peripheral, not a core functional unit.

Step-by-Step Solution:

Step 1: List canonical functional units: input, output, memory, ALU, control.Step 2: Compare options to the canonical list.Step 3: Identify “modem” as a communication peripheral rather than a core unit.

Verification / Alternative check:
Intro CS and architecture texts categorize modem as an I/O device on communication interfaces, not an internal architectural unit like the ALU or control unit.

Why Other Options Are Wrong:

Input unit: Core unit for data ingress.Memory unit: Core for storage of instructions/data.Control unit: Core for sequencing and control signals.Arithmetic-logic unit: Core for arithmetic/logic operations.

Common Pitfalls:
Equating frequently used peripherals (like modems) with functional units. Functional units are architectural blocks, not external devices.

Computer organization basics: A(n) ________ is not a functional unit of a computer.

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