I/O Subsystem - Operating System Questions & Answers

1.

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

2.

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

3.

Which buffer holds the output for a device?

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

Answer: Option 'B'

spool

4.

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

5.

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

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