Operating System (OS)
What are the two types of Semaphore?

Counting Semaphores and Binary Semaphores
Critical Semaphores and System Semaphores
Analog Semaphores and Octal Semaphores
Digital Semaphores and Binary Semaphores

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Operating System (OS)
A real time operating system is most likely to be used for which of the following task?

Ensuring that system clock works correctly on server
Controlling the fuel injection system of an automobile engines
Managing the access to system files in a laptop computers
Controlling access to a shared printer in a network

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Operating System (OS)
A spooler is a

Program that coordinates the print job that are waiting to process
Message sent from the printer to the operating system when a print job is completed
Queue of print job that are waiting to print
Location in memory that maintains the contents of documents until it prints

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