I/O Subsystem MCQ’s

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This set of Operating System Multiple Choice Questions & Answers (MCQs) focuses on “I/O Subsystem”.

1. The data-in register of I/O port is ____________
a) Read by host to get input
b) Read by controller to get input
c) Written by host to send output
d) Written by host to start a command

2. The host sets _____ bit when a command is available for the controller to execute.
a) write
b) status
c) command-ready
d) control

3. I/O hardware contains ____________
a) Bus
b) Controller
c) I/O port and its registers
d) All of the mentioned

4. When hardware is accessed by reading and writing to the specific memory locations, then it is called ____________
a) port-mapped I/O
b) controller-mapped I/O
c) bus-mapped I/O
d) none of the mentioned

5. Which hardware triggers some operation after certain programmed count?
a) programmable interval timer
b) interrupt timer
c) programmable timer
d) none of the mentioned

6. Which buffer holds the output for a device?
a) spool
b) output
c) status
d) magic

7. Device drivers are implemented to interface ____________
a) character devices
b) block devices
c) network devices
d) all of the mentioned

8. The device-status table contains ____________
a) each I/O device type
b) each I/O device address
c) each I/O device state
d) all of the mentioned

9. Which one of the following connects high-speed high-bandwidth device to memory subsystem and CPU.
a) Expansion bus
b) PCI bus
c) SCSI bus
d) None of the mentioned

10. A process is moved to wait queue when I/O request is made with ____________
a) non-blocking I/O
b) blocking I/O
c) asynchronous I/O
d) synchronous I/O

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