Operating System MCQs

1019 MCQs  (Page 84 of 102)

Attempt Operating System Quiz
Once the changes are written to the log, they are considered to be ________
A. Committed
B. Aborted
C. Completed
D. None of the mentioned
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When an entire committed transaction is completed, ___________
A. It is stored in the memory
B. It is removed from the log file
C. It is redone
D. None of the mentioned
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What is a circular buffer?
A. Writes to the end of its space and then continues at the beginning
B. Overwrites older values as it goes
C. All of the mentioned
D. None of the mentioned
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All the changes that were done from a transaction that did not commit before the system crashed, have to be _________
A. Saved
B. Saved and the transaction redone
C. Undone
D. None of the mentioned
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I/O hardware contains ____________
A. Bus
B. Controller
C. I/o port and its registers
D. All of the mentioned
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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
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The host sets _____ bit when a command is available for the controller to execute.
A. Write
B. Status
C. Command-ready
D. Control
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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
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Device drivers are implemented to interface ____________
A. Character devices
B. Block devices
C. Network devices
D. All of the mentioned
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Which hardware triggers some operation after certain programmed count?
A. Programmable interval timer
B. Interrupt timer
C. Programmable timer
D. None of the mentioned
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Word of the Day
12 Jul
Obdurate
stubbornly refusing to change one’s opinion or course of action.
ضدی، بدکار، سنگدلی

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