1. | Which RAID level refers to disk mirroring? |
a. | 0 |
b. | 1 |
c. | 2 |
d. | 3 |
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Answer: (b).1
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2. | The amount of time required to read a block of data from a disk into memory is composed of seek time, rotational latency, and transfer time. Rotational latency refers to |
a. | the time its takes for the platter to make a full rotation |
b. | the time it takes for the read-write head to move into position over the appropriate track |
c. | the time it takes for the platter to rotate the correct sector under the head |
d. | none of the above |
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Answer: (a).the time its takes for the platter to make a full rotation
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3. | ______ is used in operating system to separate mechanism from policy. |
a. | Single level implementation |
b. | Two level implementation |
c. | Multi level implementation |
d. | None of the above |
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Answer: (b).Two level implementation
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4. | I/O hardware contains |
a. | Bus |
b. | Controller |
c. | I/O port and its registers |
d. | All of the mentioned |
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Answer: (d).All of the mentioned
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5. | 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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Answer: (a).Read by host to get input
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6. | 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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Answer: (c).command-ready
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7. | 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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Answer: (d).none of the mentioned
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8. | Device drivers are implemented to interface |
a. | character devices |
b. | block devices |
c. | network devices |
d. | all of the mentioned |
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Answer: (d).all of the mentioned
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9. | 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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Answer: (a).programmable interval timer
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10. | 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 |
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Answer: (d).all of the mentioned
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