$1.$ True or False $(30$ points $2$ points each$)(1)$ In a uni$-$processor system, it's possible to have multiple processes in the running state. $(2)$ Response time refers to the duration between the submission of a request and the generation of the initial response. $(3)$ The convoy effect describes a situation in which both the CPU and I$/$O device resources are busy. $(4)$ In Named Pipe $($FIFO$),$ communication is uni$-$directional and has no parent$-$child relationship. $(5)$ System calls are implemented using an instruction which generates an interrupt. $(6)$ The multilevel feedback queue scheduling algorithm gives preference to processes with longer CPU bursts. $(7)$ A Round Robin $($RR$)$ scheduler produces results similar to a FIFO scheduler when the time quantum is shorter. $(8)$ A Round Robin $($RR$)$ scheduler with longer time quantum performs poorly on turnaround time than a RR scheduler with shorter time quantum. $(9)$ Processes in User mode can access all the resources on the machine. $(10)$ An OS that performs time$-$sharing can reduce the response time of each process by increasing the length of the time quantum. $(11)$ A trap instruction such as $$int n$$ can raise the privilege level to kernel mode. $(12)$ One of the solutions to prevent another interrupt from occurring during interrupt or trap handling is to disable interrupts during interrupt processing. $(13)$ Cache coherence is a protocol designed to ensure the consistency of the contents of caches across multiple different CPUs. $(14)$ The entity performing bus snooping is the cache controller of each CPU. $(15)$ A multi$-$processor scheduler that considers cache affinity resolves the load balancing issue among CPUs.