1.2 The Main Components of Computer Systems

The main component of a computer that executes hardware and software operations is known as the:

• a) RAM

• b) Arithmetic Logic Unit

• c) CPU

• d) Input Device

Answer explanation

The CPU, or Central Processing Unit, is the main component of a computer responsible for executing hardware and software operations. It processes instructions and manages tasks, making it essential for overall system functionality.

Which of the following best describes the function of the control unit in the CPU?

• a) Performs computations and logical decisions

• b) Manages the flow of data between the CPU and input/output

• c) Stores data temporarily

• d) Stores start-up configuration data

Answer explanation

The control unit in the CPU primarily manages the flow of data between the CPU and input/output devices, coordinating their operations. Thus, option b) is the best description of its function.

The Arithmetic and Logic Unit (ALU) is responsible for:

• a) Managing input and output devices

• b) Storing configuration data

• c) Performing arithmetic and logical operations

• d) Displaying output

Answer explanation

The correct answer is c) Performing arithmetic and logical operations. The ALU is a critical component of the CPU that executes mathematical calculations and logical comparisons, not b) Storing configuration data.

RAM is a type of:

• a) Permanent memory

• b) Volatile memory

• c) Non-volatile memory

• d) Backing storage

Answer explanation

RAM (Random Access Memory) is classified as volatile memory because it loses its data when the power is turned off, unlike non-volatile memory which retains data. Therefore, the correct answer is b) Volatile memory.

Which type of memory is used to store the BIOS?

• a) RAM

• b) ROM

• c) ALU

• d) Backing storage

Answer explanation

The BIOS (Basic Input/Output System) is stored in ROM (Read-Only Memory) because it needs to be non-volatile and retain its data even when the computer is powered off, unlike RAM which is volatile.

A device that only receives data from the computer to display the output is called a(n):

• a) Input device

• b) Output device

• c) CPU

• d) ALU

Answer explanation

An output device is designed to receive data from a computer and display it, such as a monitor or printer. In contrast, input devices send data to the computer. Therefore, the correct answer is b) Output device.

Which of the following is true about secondary storage?

• a) It is volatile

• b) Data is lost when power is off

• c) It stores data permanently

• d) It can only be read from

Answer explanation

Secondary storage is non-volatile, meaning it retains data even when power is off. Therefore, option c) is correct as it stores data permanently, unlike options a) and b) which describe volatile storage.

The type of memory that retains information even without power is:

• a) RAM

• b) ROM

• c) Program counter

• d) Registers

Answer explanation

ROM (Read-Only Memory) retains information even without power, making it non-volatile. In contrast, RAM (Random Access Memory) loses its data when power is off, while secondary storage refers to devices like hard drives that also retain data.

Which is faster in accessing data?

• a) Backing storage
• b) Internal memory
• c) Input device
• d) Output device

Answer explanation

Internal memory is fast storage inside a device used for active data and programs. It includes RAM (temporary, volatile) and ROM (permanent, non-volatile), playing a key role in system performance despite its limited capacity.

The CMOS battery is used to store:

• a) BIOS data
• b) RAM data
• c) Operating system data
• d) User data