MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -Explanation: An interrupt function is to break the sequence of operation. Explanation: An interrupt transfers the control to interrupt service routine (ISR). After executing ISR, the control is transferred back again to the main program.

Detailed explanation-2: -An interrupt service routine (ISR) is a software routine that hardware invokes in response to an interrupt. ISR examines an interrupt and determines how to handle it executes the handling, and then returns a logical interrupt value. If no further handling is required the ISR notifies the kernel with a return value.

Detailed explanation-3: -Explanation: After the execution of the ISR, the control must go to the previous program (maybe main program) which was being executed. To execute it, IRET is placed at the end of ISR.

Detailed explanation-4: -If there is an interrupt present then it will trigger the interrupt handler, the handler will stop the present instruction which is processing and save its configuration in a register and load the program counter of the interrupt from a location which is given by the interrupt table.

Detailed explanation-5: -When an interrupt occurs, it causes the CPU to stop executing the current program. The control then passes to a special piece of code called an Interrupt Handler or Interrupt Service Routine. The interrupt handler will process the interrupt and resume the interrupted program.