in a multitasking system, the context-switch time is 1ms and the time slice is 10ms. Will the CPU efficiency increase or decrease when we increase the time slice to 15ms? Explain why.

Answer explained below

Explanation:

It depends on the arrival time and burst time of the processes. On increasing the time slice the waiting and turn around time can increase and decrease both.

As waiting time and turn around time are the major criteria for calculating the efficiency, so we can't say whether the efficiency will increase or decrease.