Digital Computer Electronics
The clock signals are used in sequential logic circuits

to tell how much time has elapsed since the system was turned on
to synchronize events in various parts of a system
to tell the time of the day
to carry serial data signals
None of these

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Digital Computer Electronics
A p- channel enhancement type MOSFET performs much the same function as a PNP transistor, except that

it operates much faster
it is controlled by current rather than by voltage like a bipolar transistor.
None of these
it is controlled by voltage rather than by current, so that it requires very little current at the control terminal
it is considerably larger

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