True/false
10. the intel 8259 programmable interrupt controller (pic) schedules the handling of interrupts according to their priority levels.

TRUE

Explanation:

The Intel 8259 is a device designed for 8085 and 8086 intel microprocessor.

The Intel 8259 Interrupt Controller (PIC) accept the requests from the  I/O devices and check whether the requests is of the higher priority than the ongoing request serviced by CPU. Interrupt is issued to the CPU based on priorities,if the request is of higher priority than ongoing service then Interrupt will be issued the ongoing service will pause and the new request will be processed. If new request has less priority then no interrupt will be issued, New request will wait for CPU to free.      

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that without the operating systems you would have to control and synchronize computer hardware.