Chapter 1: Computer System Overview (Q1–Q10)
Q1. State the basic units of a computer. Name the sub-units of CPU and their functions.
Ans: Basic units: Input Unit, Output Unit, Memory Unit, CPU
CPU sub-units: ALU (performs calculations), CU (controls operations), Registers (temporary
storage)
Q2. What is the function of memory? What are its measuring units?
Ans: Function: Stores data, instructions, and results
Units: Bit, Byte, KB, MB, GB, TB
Q3. Give examples of system software and application software with functions.
Ans: System software: Windows, Linux (controls hardware)
Application software: MS Word, Excel (performs user tasks)
Q4. What is the difference between RAM and ROM?
Ans: RAM: Temporary, volatile, read-write
ROM: Permanent, non-volatile, read-only
Q5. What is cache memory? Why is it important?
Ans: Cache memory is very fast memory near CPU; it increases processing speed
Q6. What is the role of CPU in a mobile system?
Ans: It processes data and controls all operations of the mobile
Q7. What are various categories of software?
Ans: System software, Application software, Utility software
Q8. What is the difference between an interpreter and a compiler?
Ans: Interpreter: Executes program line by line
Compiler: Translates whole program at once
Q9. What is application software? Why is it required?
Ans: Application software is used for user tasks; it is required to perform specific work
Q10. Identify each statement:
i) Takes one statement at a time and executes it. - Interpreter
