What is the difference between Abstract class and Interface
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When should you use an abstract class, when an interface, when both?
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What is similarities/difference between an Abstract class and Interface?
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What is the difference between interface and an abstract class?1. Abstract class is a class which contain one or more abstract methods, which has to be implemented by [...]

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What is MUTEX ?
What isthe difference between a ‘thread’ and a ‘process’?
What is INODE?
Explain the working of Virtual Memory.
How does Windows NT supports Multitasking?
Explain the Unix Kernel.
What is Concurrency? Expain with example Deadlock and Starvation.
What are your solution strategies for “Dining Philosophers Problem” ?
Explain Memory Partitioning, Paging, Segmentation.
Explain Scheduling.
Operating System Security.
What is Semaphore?
Explain the following [...]

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What does a special set of tags <?= and ?> do in PHP? - The output is displayed directly to the browser.
What’s the difference between include and require? - It’s how they handle failures. If the file is not found by require(), it will cause a fatal error and halt the execution of the script. [...]

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How many memory layers are in the shared pool?
How do you find out from the RMAN catalog if a particular archive log has been backed-up?
How can you tell how much space is left on a given file system and how much space each of the file system’s subdirectories take-up?
Define the SGA and how you would [...]

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