What is a file in os?

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When I startup my computer the screen is black?

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how does virtual memory work?

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Explain about memory management in operating system.

0 Answers   Aditi Placement Service,

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Hi, This question may sound stupid. But I want to know that if the secondary storage device is used to store data on computer, then what is the use of the primary storage in the first place? Why cant we use only one?

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What is an example of a network operating system?

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1) What is an Virtual memory? 2) How do we test API's in both Windows/Linux/Unix? 3) What is an IOCTL? 4) How do you open a char device through API's? 5) What is major num/ minor num? 6) What is the max num for minor num? 7) Who gives you the major / minor numbers? 8) Reverse a string using recursive func. 9) fork/vfork/clone. 10) What does fork returns? 11) What is a zombie process? 12) What happens when a child completes before parent tries to wait for it? 13) Interrupt handlers, top-hdnl....?

0 Answers   TCS, Wipro,

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Why context switching is overhead?

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How do you kill a computer with command prompt?

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Can we kill init process?

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Q1. What is an interrupt? How are multiple interrupts dealt with? Q2. Explain the difference between a MONOLITHIC KERNAL and a MICROKERNAL? Q3. List reasons why a Mode switch between threads may be cheaper than a Mode switch between processes. Q4. What is the difference among deadlock avoidance, detection and prevention? Q5. What items of information about a task might be useful in real time scheduling? Q6. Discuss some of the reasons for implementing process migration ? How is the process address space handled during process migration?

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How many os are there?

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