Computer System Question and Answer
2 marks Question
Q1. What is a computer? Mention any two characteristics of a computer.
Answer:
A computer is an electronic device that accepts data as input, processes it according to a set of instructions, stores it, and produces meaningful information as output.
Any two characteristics of a computer are:
- Speed: A computer can perform millions or even billions of calculations in a very short time.
- Accuracy: A computer produces accurate results if the input data and instructions are correct.
Q2. Differentiate between Hardware and Software.
Answer:
| Hardware | Software |
|---|---|
| Hardware refers to the physical components of a computer that can be seen and touched. | Software refers to a set of programs and instructions that tell the computer what to do. |
| It is manufactured. | It is developed or programmed. |
| Examples: Keyboard, Mouse, Monitor, CPU | Examples: Windows, MS Word, Python |
Q3. What is CPU? Name its main components.
Answer:
The CPU (Central Processing Unit) is the main processing unit of a computer. It is known as the brain of the computer because it performs all processing operations and controls the functioning of the entire computer system.
The two main components of the CPU are:
- Arithmetic Logic Unit (ALU): Performs arithmetic calculations and logical operations.
- Control Unit (CU): Controls and coordinates all the activities of the computer and manages the execution of instructions.
Q4. What is the difference between RAM and ROM?
Answer:
| RAM (Random Access Memory) | ROM (Read Only Memory) |
|---|---|
| RAM is a volatile memory, which means its contents are lost when the computer is switched off. | ROM is a non-volatile memory, which means its contents are retained even after the computer is switched off. |
| It is used to store data and programs that are currently being processed by the CPU. | It is used to store permanent instructions required for booting and operating the computer. |
Q5. What are Input Devices? Give two examples.
Answer:
Input devices are hardware devices that are used to enter data, instructions, and commands into a computer for processing.
Examples:
- Keyboard: Used to enter text, numbers, and commands into the computer.
- Mouse: Used to point, click, select, and interact with objects displayed on the screen.
Q6. What are Output Devices? Give two examples.
Answer:
Output devices are hardware devices that are used to display or produce the results of data processing performed by a computer.
Examples:
- Monitor: Used to display text, images, videos, and other information on the screen.
- Printer: Used to produce a hard copy of documents, images, and other data on paper.
Q7. What is System Software? Give examples.
Answer:
System software is a type of software that manages and controls the hardware of a computer and provides a platform for application software to run. It helps the computer operate efficiently and coordinates all system resources.
Examples:
- Windows
- Linux
- macOS
- Android
Q8. What is Application Software? Give two examples.
Answer:
Application software is a type of software designed to help users perform specific tasks or solve particular problems. It runs on top of the operating system and is developed to meet the user's requirements.
Examples:
- Microsoft Word (MS Word): Used for creating and editing documents.
- Microsoft Excel (MS Excel): Used for performing calculations, data analysis, and creating spreadsheets.
Q9. What is Computer Memory?
Answer:
Computer memory is the storage space in a computer where data, instructions, and information are stored for processing and future use. It enables the computer to store and retrieve data whenever required.
Computer memory is mainly of two types:
- Primary Memory: RAM (Random Access Memory) and ROM (Read Only Memory).
- Secondary Memory: Hard Disk, SSD, Pen Drive, CD/DVD, etc.
Q10. What is a Microprocessor?
Answer:
A microprocessor is an Integrated Circuit (IC) that contains the Central Processing Unit (CPU) of a computer on a single chip. It performs arithmetic, logical, and control operations by executing program instructions.
Examples:
- Intel Core i5
- Intel Core i7
- AMD Ryzen 5
- AMD Ryzen 7
3 marks Question
Q1. Explain the IPO Cycle with a diagram.
Answer:
The IPO Cycle stands for Input – Process – Output Cycle. It is the basic working cycle of a computer that describes how data is converted into meaningful information.
1. Input
In this stage, data and instructions are entered into the computer using input devices such as a keyboard, mouse, or scanner.
2. Processing
The Central Processing Unit (CPU) processes the input data according to the given instructions. It performs arithmetic and logical operations to convert the data into useful information.
3. Output
After processing, the computer displays the result through output devices such as a monitor, printer, or speaker.
Diagram:
|
Input Keyboard, Mouse, Scanner |
→ |
Processing CPU (ALU + CU) |
→ |
Output Monitor, Printer, Speaker |
Example:
A student enters marks using the keyboard (Input). The CPU calculates the total and percentage (Processing), and the result is displayed on the monitor (Output).
Q2. Explain the functions of CPU.
Answer:
The Central Processing Unit (CPU) is the main processing unit of a computer. It is known as the brain of the computer because it performs all processing operations and controls the functioning of the entire computer system.
The main functions of the CPU are:
-
Performs Data Processing:
It performs arithmetic operations (such as addition, subtraction, multiplication, and division) and logical operations (such as comparison and decision-making).
-
Controls Computer Operations:
The Control Unit (CU) manages and coordinates the activities of all hardware components, ensuring that instructions are executed in the correct sequence.
-
Executes Program Instructions:
The CPU fetches instructions from memory, processes them, and produces the required output.
Components of CPU:
- Arithmetic Logic Unit (ALU): Performs arithmetic and logical operations.
- Control Unit (CU): Controls and coordinates the execution of instructions and the overall functioning of the computer.
Q3. Differentiate between Primary Memory and Secondary Memory.
Answer:
| Primary Memory | Secondary Memory |
|---|---|
| Primary memory is directly accessed by the CPU. | Secondary memory is not directly accessed by the CPU. |
| It is faster and has a smaller storage capacity. | It is slower but provides a much larger storage capacity. |
| It is used to store data and instructions currently being processed by the CPU. | It is used to store data and programs permanently for future use. |
| Examples: RAM, ROM | Examples: Hard Disk, SSD, Pen Drive, CD/DVD |
Q4. Explain the Generations of Computers.
Answer:
The development of computers is divided into five generations based on the technology used in their construction. Each generation introduced significant improvements in speed, size, storage, and processing capability.
| Generation | Technology Used | Main Feature |
|---|---|---|
| First Generation (1946–1959) | Vacuum Tubes | Large size, slow processing, and high power consumption. |
| Second Generation (1959–1965) | Transistors | Smaller, faster, more reliable, and consumed less power. |
| Third Generation (1965–1971) | Integrated Circuits (ICs) | Increased speed, reduced size, and improved efficiency. |
| Fourth Generation (1971–Present) | Microprocessors | High-speed processing, compact size, and personal computers became popular. |
| Fifth Generation (Present and Beyond) | Artificial Intelligence (AI) | Focuses on AI, machine learning, natural language processing, and advanced computing. |
Conclusion:
Each generation of computers has improved performance, storage capacity, reliability, and efficiency while reducing the size and cost of computer systems.
Q5. Explain any three characteristics of a computer.
Answer:
A computer has several characteristics that make it an efficient and reliable electronic device. Any three characteristics of a computer are:
-
Speed:
A computer can perform millions or even billions of calculations in a very short time. It completes complex tasks within seconds.
-
Accuracy:
A computer produces highly accurate results if the input data and instructions are correct. Errors usually occur due to incorrect input or programming mistakes.
-
Diligence:
A computer can work continuously for long hours without getting tired, bored, or losing its efficiency. It performs repetitive tasks with the same speed and accuracy every time.
Q6. Explain the different types of software.
Answer:
Software is a collection of programs and instructions that enables a computer to perform specific tasks. It is broadly classified into two types:
1. System Software
System software manages and controls the computer hardware and provides a platform for running application software. It is essential for the proper functioning of the computer.
Examples: Windows, Linux, macOS
2. Application Software
Application software is designed to help users perform specific tasks such as creating documents, preparing presentations, or browsing the Internet.
Examples: Microsoft Word, Microsoft Excel, Google Chrome
Difference between System Software and Application Software:
| System Software | Application Software |
|---|---|
| Manages and controls the computer system. | Performs specific tasks for the user. |
| Acts as a platform for application software. | Runs on top of the system software. |
| Examples: Windows, Linux | Examples: MS Word, MS Excel |
Conclusion:
Both system software and application software are essential for the efficient operation of a computer. System software manages the computer's resources, while application software helps users perform specific tasks efficiently.
Q7. Explain the difference between RAM and ROM.
Answer:
RAM (Random Access Memory) and ROM (Read Only Memory) are the two main types of primary memory in a computer. They differ in their purpose, storage capability, and data retention.
| RAM (Random Access Memory) | ROM (Read Only Memory) |
|---|---|
| RAM is a volatile memory, which means its contents are lost when the computer is switched off. | ROM is a non-volatile memory, which means its contents remain stored even after the computer is switched off. |
| It is used to store data and programs that are currently being processed by the CPU. | It stores permanent instructions required to boot and operate the computer. |
| Data stored in RAM can be read and modified. | Data stored in ROM is read-only and cannot be easily modified. |
| RAM is faster than ROM. | ROM is slower than RAM. |
| Examples: DDR4 RAM, DDR5 RAM | Examples: BIOS ROM, Firmware ROM |
Conclusion:
RAM is used for temporary storage while the computer is running, whereas ROM is used for permanent storage of essential system instructions required to start and operate the computer.
Q8. What are Input and Output Devices? Give examples.
Answer:
Input devices and output devices are hardware components of a computer system. Input devices are used to enter data and instructions into the computer, while output devices are used to display or produce the processed information.
Input Devices
Input devices are used to enter data, instructions, and commands into a computer for processing.
Examples:
- Keyboard
- Mouse
- Scanner
- Microphone
Output Devices
Output devices are used to display or present the processed information generated by the computer.
Examples:
- Monitor
- Printer
- Speaker
- Projector
Difference between Input and Output Devices:
| Input Devices | Output Devices |
|---|---|
| Used to enter data and instructions into the computer. | Used to display or present the processed information. |
| Sends data to the computer for processing. | Receives processed data from the computer. |
| Examples: Keyboard, Mouse, Scanner | Examples: Monitor, Printer, Speaker |
Conclusion:
Input devices help users provide data to the computer, whereas output devices present the results of processing in a readable or usable form.
Q9. Explain the role of the Operating System.
Answer:
An Operating System (OS) is system software that acts as an interface between the user and the computer hardware. It manages all the resources of the computer and provides an environment for running application programs.
Roles of an Operating System:
-
Memory Management:
It manages the computer's primary memory (RAM) by allocating and deallocating memory to programs as needed.
-
Process Management:
It controls the execution of programs, schedules tasks, and enables multitasking.
-
File Management:
It organizes, stores, retrieves, and manages files and folders on storage devices.
-
Device Management:
It controls and coordinates input and output devices such as the keyboard, mouse, printer, and monitor.
-
User Interface:
It provides a Graphical User Interface (GUI) or Command-Line Interface (CLI) that allows users to interact with the computer easily.
Examples of Operating Systems:
- Microsoft Windows
- Linux
- macOS
- Android
Conclusion:
The Operating System is essential software that manages hardware resources, executes programs, and provides a user-friendly interface, enabling the computer to function efficiently.
Q10. Explain Binary Number System and why computers use it.
Answer:
The Binary Number System is a number system that uses only two digits: 0 and 1. It has a base (radix) of 2. Every piece of data and every instruction inside a computer is represented using binary digits, also known as bits.
Why do computers use the Binary Number System?
-
Electronic Components:
Computers use electronic circuits that have only two stable states: ON (1) and OFF (0).
-
Reliable Processing:
Binary representation reduces errors and allows computers to process data accurately and efficiently.
-
Easy Storage and Processing:
All types of data, such as numbers, text, images, and videos, are converted into binary form for storage and processing.
Example:
- Decimal Number 5 = Binary Number 101
- Decimal Number 10 = Binary Number 1010
Conclusion:
The Binary Number System is the fundamental language of computers because it matches the two-state operation (ON/OFF) of electronic circuits, making data storage, processing, and communication simple, reliable, and efficient.
