Lec3 - Part2

Why does Android allow services to run in the background, while early iOS did not?

• Android services are pre-installed by the system

• Android uses less battery than iOS

• Android supports more flexible multitasking using services

• iOS didn’t support memory allocation

Which of the following best describes a zombie process?

• A process that was suspended and never resumed

• A child process that is still running without its parent

• A terminated process that hasn't been collected by its parent

• A process without access to memory

What happens if a parent terminates without calling wait() for its child process?

• The child is forced to terminate immediately

• The child becomes an orphan and may be adopted by the init/system process

• The child remains blocked forever

• The OS restarts the parent automatically

Which best describes the role of a service in Android?

• A graphical interface for background apps

• A special type of process that controls CPU scheduling

• A component that performs background tasks without a UI

• A class used to stop processes on exit

If a child process finishes execution and the parent is not waiting, what happens to the PID and exit status?

• They are reused by the system immediately

• They remain in the process table as a zombie

• They are discarded silently

• The kernel blocks the parent until it collects the child

Which of the following best defines cascading termination?

• Termination of parent causes suspension of child

• Termination of parent causes all children to be terminated

• Child kills parent and takes over PID

• Processes terminate one after another in round robin

What is the difference between a zombie and an orphan process?

• Zombie: running; Orphan: terminated

• Zombie: no parent; Orphan: parent doesn’t wait

• Zombie: terminated but not collected; Orphan: alive but parentless

• Both mean the same

What Linux system call allows the parent to collect the child’s termination status and prevent a zombie process?

• kill()

• fork()

• wait()

• exec()

Which process type is most likely to be terminated first by Android when the system is low on memory?

• Foreground process

• Service process

• Visible process

• Empty process

Why might an orphan process not immediately become a zombie even though its parent has terminated?

• Because it’s automatically reparented to a kernel thread that invokes wait()

• Because the kernel suspends orphan processes until memory is freed

• Because zombies only occur if the child finishes before being adopted by init

• Because init (PID 1) adopts the orphan and immediately calls wait() upon its termination