Input Output (IO) System
Multiple Choice questions & answers are available for a Computer Science students to clear GAT, NTS, ECAT exams, various technical interview, competitive examination, and other entrance exam. Input Output (IO) System is the important Topic for a computer science and technical students and one should practice these Mcqs to grasp good knowledge on the topic.
17. If one or more devices use a common set of wires to communicate with the computer system, the connection is called ______
CPU
Monitor
Wirefull
Bus
18. A ____ a set of wires and a rigidly defined protocol that specifies a set of messages that can be sent on the wires.
Port
Node
Bus
None of the mentioned
19. When device A has a cable that plugs into device B, and device B has a cable that plugs into device C and device C plugs into a port on the computer, this arrangement is called a _________
Port
Daisy chain
Bus
Cable
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20. The _________ present a uniform device-access interface to the I/O subsystem, much as system calls provide a standard interface between the application and the operating system.
Devices
Buses
Device drivers
I/O systems
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21. A ________ is a collection of electronics that can operate a port, a bus, or a device.
Controller
Driver
Host
Bus
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22. An I/O port typically consists of four registers status, control, ________ and ________ registers.
System in, system out
Data in, data out
Flow in, flow out
Input, output
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23. The ______ register is read by the host to get input.
Flow in
Flow out
Data in
Data out
24. The ______ register is written by the host to send output.
Status
Control
Data in
Data out
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25. The hardware mechanism that allows a device to notify the CPU is called _______
Polling
Interrupt
Driver
Controlling
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26. The CPU hardware has a wire called __________ that the CPU senses after executing every instruction.
Interrupt request line
Interrupt bus
Interrupt receive line
Interrupt sense line
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27. The _________ determines the cause of the interrupt, performs the necessary processing and executes a return from the interrupt instruction to return the CPU to the execution state prior to the interrupt.
Interrupt request line
Device driver
Interrupt handler
All of the mentioned
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28. In general the two interrupt request lines are :
Maskable & nonmaskable interrupts
Blocked & nonmaskable interrupts
Maskable & blocked interrupts
None of the mentioned
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29. The _________ are reserved for events such as unrecoverable memory errors.
Nonmaskable interrupts
Blocked interrupts
Maskable interrupts
None of the mentioned
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30. The ________ can be turned off by the CPU before the execution of critical instruction sequences that must not be interrupted.
Nonmaskable interrupt
Blocked interrupt
Maskable interrupt
None of the mentioned
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