6. A mechanism that relates to an error or exception condition generated within the currently running process, such as an illegal file access attempt, is called (A) Interrupt (B) Trap (C) Swapping (D) Pre-emption (E) None of the above 7. Which of the following statement regarding interrupt is incorrect? (A) If no interrupts are pending, the processor proceeds to the next fetch stage. (B) Interrupt usually involves some overhead. (C) In handling multiple interrupts, the processor cannot disable other interrupts while an interrupt is being processed. (D) When the processor transfers control to the interrupt service routine, it needs to save the Program Status Word and the location of next instruction to be executed. (E) None of the above.

8. Which of the following statement regarding memory is incorrect? (A) When the processor attempts to read a byte or word, it will first check with the cache memory. (B) The main memory is usually large and slow. (C) The cache size has impacts on performance of the processor. (D) As the cache block size increases, the hit ratio will decrease. (E) None of the above. 9. Which of the following technique is not used for I/O operations? (A) Programmed I/O (B) Interrupt-driven I/O (C) Direct Memory Access (D) Peripheral polling I/O (E) None of the above 10. Which of the following defines the system call interface to operating systems and hardware resources? (A) ABI (B) ISA (C) API (D) HLL (E) None of the above