Class 11 Computer Science – Chapter 1: Computer System
Exercise Questions and Answers (2025-26)
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Q1: Name the software required to make a computer functional. Write down its two primary services.
Answer: The software required is the Operating System.
- Managing hardware resources.
- Providing user interface to interact with the computer.
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Q2: How does the computer understand a program written in high level language?
Answer: Computer uses translators like compiler or interpreter to convert high-level language into machine code.
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Q3: Why is the execution time of the machine code less than that of source code?
Answer: Machine code is directly understood by the computer, while source code needs to be first translated.
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Q4: What is the need of RAM? How does it differ from ROM?
Answer: RAM stores data and programs temporarily while working. RAM is volatile, but ROM is non-volatile.
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Q5: What is the need for secondary memory?
Answer: Secondary memory is needed to permanently store data and software since RAM is temporary and limited.
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Q6: How do different components of the computer communicate with each other?
Answer: Through system bus:
- Data Bus – transfers data
- Address Bus – carries memory address
- Control Bus – sends control signals
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Q7: Draw the block diagram of a computer system. Briefly write about the functionality of each component.
Answer: Block Diagram:
Input Device → CPU ↔ Memory → Output Device ↕ Secondary Storage- Input Device: Sends data (e.g., keyboard)
- CPU: Processes the data
- Memory: Stores data temporarily
- Output Device: Shows result (e.g., monitor)
- Storage: Stores data permanently
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Q8: What is the primary role of system bus? Why is data bus bidirectional while address bus is unidirectional?
Answer: System bus transfers data, addresses, and control signals.
- Data bus is bidirectional (data goes in and out).
- Address bus is unidirectional (CPU only sends address).
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Q9: Differentiate between proprietary software and freeware software. Name two software for each type.
Proprietary Software Freeware Software Purchased, Closed Source Free to use, No source code Windows, MS Office Skype, Adobe Reader -
Q10: Write the main difference between microcontroller and microprocessor. Why do smart home appliances use microcontroller?
Answer:
- Microprocessor = Only CPU
- Microcontroller = CPU + Memory + I/O on one chip
Smart appliances use microcontroller because it is small, cheap, and efficient for specific tasks.
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Q11: Mention the different types of data that you deal with while browsing the Internet.
- Text
- Images
- Videos
- Audio
- HTML pages
- Forms and tables
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Q12: Categorise the following data:
- Newspaper → Unstructured
- Cricket Match Score → Structured
- HTML Page → Semi-structured
- Patient Records → Structured
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Q13: Name the input or output device used:
- a) Speaker / Headphone
- b) Keyboard
- c) Printer
- d) Monitor
- e) Microphone
- f) 3D Printer
- g) Braille Keyboard
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Q14: Identify the software category:
- a) Compiler → Programming Tool
- b) Assembler → Programming Tool
- c) Ubuntu → System Software
- d) Text Editor → Application/Programming Tool
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