I/O Subsystem - Operating System Questions & Answers

1.

I/O hardware contains

   A.) Bus
   B.) Controller
   C.) I/O port and its registers
   D.) All of the mentioned

Answer: Option 'D'

All of the mentioned

2.

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

Answer: Option 'A'

Read by host to get input

3.

The host sets _____ bit when a command is available for the controller to execute.

Basic Computer Knowledge Quiz

   A.) write
   B.) status
   C.) command-ready
   D.) control

Answer: Option 'C'

command-ready

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

Answer: Option 'D'

none of the mentioned

5.

Device drivers are implemented to interface

   A.) character devices
   B.) character devices
   C.) network devices
   D.) all of the mentioned

Answer: Option 'D'

all of the mentioned

6.

Which hardware triggers some operation after certain programmed count?

   A.) programmable interval timer
   B.) interrupt timer
   C.) programmable timer
   D.) none of the mentioned

Answer: Option 'A'

programmable interval timer

7.

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

Answer: Option 'A'

Expansion bus

8.

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

Answer: Option 'B'

blocking I/O

9.

Which buffer holds the output for a device?

   A.) magic
   B.) spool
   C.) output
   D.) status

Answer: Option 'B'

spool

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