1. Operating system is a collection of a) Software routines b) Input-output devices c) Hardware components d) All of these 2. FIFO scheduling is a) Fair-share scheduling b) Deadline scheduling c) Non-preemptive scheduling d) Preemptive scheduling 3. How many times the following C program prints yes? Int main() { fork(); fork(); printf("yes"); } a) Once b) Twice c) Four d) eight 4. If a thread invokes the exec system call; a) Only the exec executes as a separate process b) The program specified in the parameter to exec will replace the entire process c) The exec is invoked as it is invoked by a thread d) None of the mentioned 5. Which of the following is not shared by threads? a) program counter b) stack c) both program counter and stack d) none of the mentioned 6. A process can be: a) Single threaded b) Multiple threaded c) Both single and multithreaded d) None of the mentioned