UNIX Question and Answer – UNIX’s Process Monitoring
UNIX MCQ – Multiple Choice Questions for exam, interview, and Entrance Test
1. Which command is used to display information about system processes in UNIX?
a) ps
b) top
c) pgrep
d) pstree
Answer: a) ps
Explanation: The ps command is used to display information about system processes in UNIX.
2. What command provides a dynamic real-time view of system performance in UNIX?
a) ps
b) top
c) pgrep
d) pstree
Answer: b) top
Explanation: The top command provides a dynamic real-time view of system performance, including CPU and memory usage, in UNIX.
3. Which command is used to find processes based on name in UNIX?
a) ps
b) top
c) pgrep
d) pstree
Answer: c) pgrep
Explanation: The pgrep command is used to find processes based on name in UNIX.
4. What command is used to terminate a process by specifying its process ID (PID) in UNIX?
a) kill
b) top
c) pgrep
d) pstree
Answer: a) kill
Explanation: The kill command is used to terminate a process by specifying its process ID (PID) in UNIX.
5. Which command is used to send a signal to multiple processes in UNIX?
a) kill
b) killall
c) pkill
d) pgrep
Answer: b) killall
Explanation: The killall command is used to send a signal to multiple processes by name in UNIX.
6. What command is used to display the processes in a tree-like structure in UNIX?
a) ps
b) top
c) pgrep
d) pstree
Answer: d) pstree
Explanation: The pstree command is used to display the processes in a tree-like structure in UNIX.
7. Which signal is commonly used to terminate a process gracefully in UNIX?
a) SIGINT
b) SIGKILL
c) SIGTERM
d) SIGSTOP
Answer: c) SIGTERM
Explanation: The SIGTERM signal is commonly used to terminate a process gracefully in UNIX.
8. What command is used to send a signal to a process based on its name in UNIX?
a) kill
b) killall
c) pkill
d) pgrep
Answer: c) pkill
Explanation: The pkill command is used to send a signal to a process based on its name in UNIX.
9. Which command is used to display the current system load averages in UNIX?
a) ps
b) top
c) uptime
d) loadavg
Answer: c) uptime
Explanation: The uptime command is used to display the current system load averages in UNIX.
10. What signal is used to stop a process temporarily in UNIX?
a) SIGINT
b) SIGKILL
c) SIGSTOP
d) SIGTERM
Answer: c) SIGSTOP
Explanation: The SIGSTOP signal is used to stop a process temporarily in UNIX.
11. Which command is used to continue a stopped process in UNIX?
a) kill
b) killall
c) continue
d) fg
Answer: d) fg
Explanation: The fg command is used to continue a stopped process in UNIX.
12. What is the purpose of the renice command in UNIX?
a) Change the process name
b) Change the process owner
c) Change the process priority
d) Change the process group
Answer: c) Change the process priority
Explanation: The renice command is used to change the priority of a running process in UNIX.
13. Which command is used to display information about the currently running processes and their resource usage in UNIX?
a) procstat
b) top
c) psinfo
d) ps
Answer: b) top
Explanation: The top command displays information about the currently running processes and their resource usage in UNIX.
14. What signal is used to kill a process immediately in UNIX?
a) SIGKILL
b) SIGTERM
c) SIGINT
d) SIGSTOP
Answer: a) SIGKILL
Explanation: The SIGKILL signal is used to kill a process immediately in UNIX.
15. Which command is used to display information about processes that are consuming the most CPU resources in UNIX?
a) ps
b) top
c) cpustat
d) perf
Answer: b) top
Explanation: The top command displays information about processes that are consuming the most CPU resources in UNIX.
16. What command is used to send a signal to a process based on its process ID (PID) in UNIX?
a) kill
b) killall
c) pkill
d) pgrep
Answer: a) kill
Explanation: The kill command is used to send a signal to a process based on its process ID (PID) in UNIX.
17. Which command is used to display detailed information about a specific process in UNIX?
a) procinfo
b) process
c) pinfo
d) ps
Answer: d) ps
Explanation: The ps command is used to display detailed information about a specific process in UNIX.
18. What signal is used to gracefully terminate a process in UNIX?
a) SIGTERM
b) SIGINT
c) SIGKILL
d) SIGSTOP
Answer: a) SIGTERM
Explanation: The SIGTERM signal is used to gracefully terminate a process in UNIX.
19. Which command is used to send a signal to all processes except for those in the same process group as the sender in UNIX?
a) kill
b) killall
c) pkill
d) pgrep
Answer: b) killall
Explanation: The killall command is used to send a signal to all processes except for those in the same process group as the sender in UNIX.
20. What command is used to display information about the currently running processes in UNIX?
a) ps
b) proc
c) processinfo
d) pinfo
Answer: a) ps
Explanation: The ps command is used to display information about the currently running processes in UNIX.
21. Which command is used to display information about memory usage by processes in UNIX?
a) memstat
b) top
c) ps
d) vmstat
Answer: b) top
Explanation: The top command displays information about memory usage by processes in UNIX.
22. What signal is used to interrupt a process in UNIX?
a) SIGTERM
b) SIGINT
c) SIGKILL
d) SIGSTOP
Answer: b) SIGINT
Explanation: The SIGINT signal is used to interrupt a process in UNIX, typically triggered by pressing Ctrl+C.
23. Which command is used to display information about the currently running processes and their resource usage in UNIX?
a) ps
b) pstree
c) procinfo
d) top
Answer: a) ps
Explanation: The ps command is used to display information about the currently running processes and their resource usage in UNIX.
24. What signal is used to suspend a process in UNIX?
a) SIGSTOP
b) SIGINT
c) SIGTSTP
d) SIGTERM
Answer: c) SIGTSTP
Explanation: The SIGTSTP signal is used to suspend a process in UNIX, typically triggered by pressing Ctrl+Z.
25. Which command is used to display information about the parent-child relationships between processes in UNIX?
a) ps
b) top
c) pstree
d) ptree
Answer: c) pstree
Explanation: The pstree command is used to display information about the parent-child relationships between processes in UNIX.
26. Which command is used to display the CPU time usage of a process in UNIX?
a) ptime
b) ptimes
c) time
d) cputime
Answer: c) time
Explanation: The time command is used to display the CPU time usage of a process in UNIX.
27. What signal is used to resume a suspended process in UNIX?
a) SIGSTOP
b) SIGCONT
c) SIGINT
d) SIGTERM
Answer: b) SIGCONT
Explanation: The SIGCONT signal is used to resume a suspended process in UNIX.
28. Which command is used to display the status of a specific process in UNIX?
a) status
b) ps
c) pstat
d) procstatus
Answer: b) ps
Explanation: The ps command is used to display the status of a specific process in UNIX.
29. What is the purpose of the nice command in UNIX?
a) Adjust process priority
b) Terminate processes
c) Display CPU usage
d) Display memory usage
Answer: a) Adjust process priority
Explanation: The nice command is used to adjust the priority of processes in UNIX.
30. Which signal is used to terminate a process gracefully by default in UNIX?
a) SIGKILL
b) SIGTERM
c) SIGINT
d) SIGSTOP
Answer: b) SIGTERM
Explanation: The SIGTERM signal is used to terminate a process gracefully by default in UNIX.
31. What command is used to change the scheduling priority of a process in UNIX?
a) nice
b) renice
c) pri
d) prio
Answer: b) renice
Explanation: The renice command is used to change the scheduling priority of a process in UNIX.
32. Which command is used to display information about memory usage by processes in UNIX?
a) memusage
b) pmem
c) pmap
d) memstat
Answer: c) pmap
Explanation: The pmap command is used to display information about memory usage by processes in UNIX.
33. What is the purpose of the killall command in UNIX?
a) Terminate processes by name
b) Terminate processes by PID
c) Terminate all processes
d) Terminate background processes
Answer: a) Terminate processes by name
Explanation: The killall command is used to terminate processes by name in UNIX.
34. Which signal is used to terminate a process immediately in UNIX?
a) SIGKILL
b) SIGTERM
c) SIGINT
d) SIGSTOP
Answer: a) SIGKILL
Explanation: The SIGKILL signal is used to terminate a process immediately in UNIX.
35. What command is used to display information about system resources and running processes in UNIX?
a) sysinfo
b) resource
c) resstat
d) top
Answer: d) top
Explanation: The top command is used to display information about system resources and running processes in UNIX.
36. Which command is used to change the scheduling priority of a process that is already running in UNIX?
a) nice
b) renice
c) prio
d) priority
Answer: b) renice
Explanation: The renice command is used to change the scheduling priority of a process that is already running in UNIX.
37. What signal is used to suspend a process temporarily in UNIX?
a) SIGSTOP
b) SIGTSTP
c) SIGCONT
d) SIGINT
Answer: a) SIGSTOP
Explanation: The SIGSTOP signal is used to suspend a process temporarily in UNIX.
38. What command is used to display information about system processes in a hierarchical format in UNIX?
a) htop
b) pstree
c) ptree
d) ps
Answer: b) pstree
Explanation: The pstree command is used to display information about system processes in a hierarchical format in UNIX.
39. Which command is used to display the status of background jobs in UNIX?
a) jobs
b) bg
c) status
d) pstree
Answer: a) jobs
Explanation: The jobs command is used to display the status of background jobs in UNIX.
40. What is the purpose of the prstat command in UNIX?
a) Display process statistics
b) Display printer status
c) Display system statistics
d) Display memory usage
Answer: a) Display process statistics
Explanation: The prstat command is used to display process statistics in UNIX.
41. Which signal is used to terminate a process by default in UNIX?
a) SIGTERM
b) SIGINT
c) SIGKILL
d) SIGSTOP
Answer: a) SIGTERM
Explanation: The SIGTERM signal is used to terminate a process by default in UNIX.
42. What command is used to display information about system processes and their resource usage in UNIX?
a) psinfo
b) pinfo
c) psaux
d) ps
Answer: d) ps
Explanation: The ps command is used to display information about system processes and their resource usage in UNIX.
43. Which command is used to change the scheduling priority of a process before executing it in UNIX?
a) priority
b) nice
c) niceness
d) pri
Answer: b) nice
Explanation: The nice command is used to change the scheduling priority of a process before executing it in UNIX.
44. What is the purpose of the bg command in UNIX?
a) Bring a background job to the foreground
b) Suspend a foreground job
c) Terminate a background job
d) Display background jobs
Answer: a) Bring a background job to the foreground
Explanation: The bg command is used to bring a background job to the foreground in UNIX.
45. Which signal is used to interrupt a process in UNIX?
a) SIGINT
b) SIGKILL
c) SIGTERM
d) SIGSTOP
Answer: a) SIGINT
Explanation: The SIGINT signal is used to interrupt a process in UNIX, typically triggered by pressing Ctrl+C.
46. What command is used to display information about system processes and their resource usage in real-time in UNIX?
a) pstop
b) psreal
c) prstat
d) top
Answer: d) top
Explanation: The top command is used to display information about system processes and their resource usage in real-time in UNIX.
47. Which command is used to change the scheduling priority of a process in UNIX?
a) prio
b) pri
c) niceness
d) nice
Answer: d) nice
Explanation: The nice command is used to change the scheduling priority of a process in UNIX.
48. What is the purpose of the kill command in UNIX?
a) Terminate a process
b) Suspend a process
c) Resume a process
d) Display process information
Answer: a) Terminate a process
Explanation: The kill command is used to terminate a process in UNIX.
49. Which command is used to display information about system processes and their resource usage in UNIX?
a) psinfo
b) pinfo
c) psaux
d) ps
Answer: d) ps
Explanation: The ps command is used to display information about system processes and their resource usage in UNIX.
50. What signal is used to suspend a process temporarily in UNIX?
a) SIGSTOP
b) SIGTSTP
c) SIGCONT
d) SIGINT
Answer: a) SIGSTOP
Explanation: The SIGSTOP signal is used to suspend a process temporarily in UNIX.
