| 1. | In UNIX, which of the following command is used to set the task priority ? |
| a. | init |
| b. | nice |
| c. | kill |
| d. | PS |
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Answer: (b).nice
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| 2. | Which of the following flags are set when ‘JMP’ instruction is executed ? |
| a. | SF and CF |
| b. | AF and CF |
| c. | All flags |
| d. | No flag is set |
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Answer: (d).No flag is set
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| 3. | Everything below the system call interface and above the physical hardware is known as ______. |
| a. | Kernel |
| b. | Bus |
| c. | Shell |
| d. | Stub |
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Answer: (a).Kernel
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| 4. | Linux operating system uses |
| a. | Affinity Scheduling |
| b. | Fair Preemptive Scheduling |
| c. | Hand Shaking |
| d. | Highest Penalty Ratio Next |
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Answer: (b).Fair Preemptive Scheduling
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| 5. | In Unix, how do you check that two given strings a and b are equal? |
| a. | test $a -eq $b |
| b. | test $a -equal $b |
| c. | test $a = $b |
| d. | both a and c |
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Answer: (d).both a and c
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| 6. | The directory structure used in Unix file system is called |
| a. | Hierarchical directory |
| b. | Tree structured directory |
| c. | Directed acyclic graph |
| d. | Graph structured directory |
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Answer: (a).Hierarchical directory
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| 7. | Which statement is not true about process 0 in the Unix operating system? |
| a. | Process 0 is called init process |
| b. | Process 0 is not created by fork system call |
| c. | After forking process 1, process O becomes swapper process |
| d. | Process 0 is a special process created when system boots |
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Answer: (a).Process 0 is called init process
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| 8. | Which or the following commands would return process_id of sleep command? |
| a. | Sleep 1 and echo $? |
| b. | Sleep 1 and echo # |
| c. | Sleep 1 and echo $* |
| d. | Sleep 1 and echo $! |
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Answer: (b).Sleep 1 and echo #
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| 9. | What does the following command do ? grep − vn "abc" x |
| a. | It will print all of the lines in the file x that match the search string "abc" |
| b. | It will print all of the lines in file x that do not match the search string "abc" |
| c. | It will print total no of the lines in file x that match the search string "abc" |
| d. | It will print the specific line numbers of file x in which there is a match for the string "abc" |
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Answer: (a).It will print all of the lines in the file x that match the search string "abc"
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| 10. | The Unix Kernel maintains two key data structures related to processes, the progress table and the user structure. Which of following information is not the part of user |
| a. | File descriptor table |
| b. | System call state |
| c. | Scheduling parameters |
| d. | Kernel stack |
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Answer: (c).Scheduling parameters
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