1. A process stack does not contain ?

Answer. PID of child process

2. Which system call returns the process identifier of a terminated child?

Answer. wait

3. The address of the next instruction to be executed by the current process is provided by the ?

Answer. Program counter

4. Do Process Control Block(PCB) contains Bootstrap program?

Answer. No

5. The number of processes completed per unit time is known as

Answer. Throughput

6. The state of a process is defined by

Answer. the current activity of the process

7. In a memory mapped input/output

Answer. the CPU writes one data byte to the data register and sets a bit in control register to show that a byte is available

8. In a programmed input/output(PIO)

Answer. the CPU uses polling to watch the control bit constantly, looping to see if a device is ready

9. In an interrupt driven input/output

Answer. the CPU receives an interrupt when the device is ready for the next byte

10. In the layered approach of Operating Systems

Answer. Highest Layer(N) is the User interface

11. How does the Hardware trigger an interrupt?

Answer. Sending signals to CPU through a system bus

12. Which operation is performed by an interrupt handler?
• Saving the current state of the system
• Loading the interrupt handling code and executing it
• Once done handling, bringing back the system to the original state it was before the interrupt occurred

Answer. All of the mentioned