Basics — Test 1

Correct Answer: C. C. Kernel is made of various modules which can not be loaded in running operating system
Explanation: Kernel is the first program which is loaded in memory when OS is loading as well as it remains in memory till OS is running. Kernel is the core part of the OS which is responsible for managing resources, allowing multiple processes to use the resources and provide services to various processes. Kernel modules can be loaded and unloaded in run-time i.e. in running OS.

Correct Answer: D. D. All of the mentioned
Explanation: An Operating System acts as an intermediary between user/user applications/application programs and hardware. It is a program that manages hardware resources. It provides services to application programs.

Correct Answer: A. A. To get and execute the next user-specified command
Explanation: The main function of command interpreter is to get and execute the next user-specified command. Command Interpreter checks for valid command and then runs that command else it will throw an error.

Correct Answer: D. D. All of the mentioned
Explanation: In Operating Systems, CPU scheduling algorithms are: i) First Come First Served scheduling ii) Shortest Job First scheduling iii) Priority scheduling iv) Round Robin scheduling v) Multilevel Queue scheduling vi) Multilevel Feedback Queue scheduling All of these scheduling algorithms have their own advantages and disadvantages.

Correct Answer: A. A. Log file
Explanation: If a process fails, most operating systems write the error information to a log file. Log file is examined by the debugger, to find out what is the actual cause of that particular problem. Log file is useful for system programmers for correcting errors.

Correct Answer: D. D. Palm os
Explanation: VxWorks, QNX & RTLinux are real-time operating systems. Palm OS is a mobile operating system. Palm OS is developed for Personal Digital Assistants (PDAs).

Correct Answer: A. A. System calls
Explanation: To access services of the Operating System an interface is provided by the System Calls. Generally, these are functions written in C and C++. Open, Close, Read, Write are some of most prominently used system calls.

Correct Answer: D. D. All of the mentioned
Explanation: All the mentioned errors are handled by OS. The OS is continuously monitoring all of its resources. Also, the OS is constantly detecting and correcting errors.

Correct Answer: A. A. Dtrace
Explanation: A facility that dynamically adds probes to a running system, both in user process and in the kernel is called DTrace. This is very much useful in troubleshooting kernels in real-time.

Correct Answer: B. B. Hybrid kernel
Explanation: OS X has a hybrid kernel. Hybrid kernel is a combination of two different kernels. OS X is developed by Apple and originally it is known as Mac OS X.