Process Quiz: Can You Master Ps, Kill, Nice & Cron?

1. What is the PID of the init process in most Linux systems?

0

1

2

10

2. What does 'ps aux' display that 'ps' alone does not?

Process IDs only

All processes with detailed information

Kernel threads

Stopped processes

3. Which environment variable stores the user's crontab location?

CRON_HOME

CRONTAB_DIR

HOME

EDITOR

4. How does 'kill -0' PID function differently from other kill signals?

Kills the process immediately

Tests if process exists without sending a signal

Pauses the process

Resumes a stopped process

5. Which crontab entry runs a command every day at 2:30 AM?

30 2 * * * command

2 30 * * * command

* * 2 30 * command

30 * 2 * * command

6. What is the default nice value for a newly created process?

-20

-10

0

10

7. Which command lists all running processes with their full command lines?

Ps -a

Ps -f

Ps -u

Ps -x

8. How many fields are in a standard crontab entry (excluding comments)?

4

5

6

7

9. What does SIGTERM signal do compared to SIGKILL?

Forcefully kills without cleanup

Allows graceful process termination

Pauses the process

Restarts the process

10. Which ps option shows process hierarchy in a tree format?

Ps -f

Ps --forest

Ps -d

Ps -h

11. Which ps command option displays all running processes across all users?

Ps -a

Ps -u

Ps -e

Ps -l

12. Which file contains system-wide cron jobs on most Linux systems?

/etc/cron.d

/var/cron

/usr/cron

/root/crontab

13. What does an asterisk (*) represent in a crontab time field?

Never execute

Execute once

Any value for that field

Execute every minute

14. In a crontab entry, which field specifies the hour (0-23)?

First field

Second field

Third field

Fourth field

15. What does cron use to schedule recurring tasks?

Shell scripts only

Crontab files with time fields

System configuration files

Manual process invocation

16. Which command modifies the priority of an already-running process?

Nice

Renice

Priority

Setpri

17. In Linux priority, which nice value indicates the highest priority?

-20

0

20

99

18. What does the 'nice' command do when launching a new process?

Assigns a process group

Sets the process priority level

Suspends process execution

Redirects process output

19. Which signal is sent by 'kill -9' to forcefully terminate a process?

SIGTERM

SIGKILL

SIGHUP

SIGSTOP

20. What does the 'STAT' column in ps output indicate?

Process statistics

Process state or status

Start time

System time used

Process Quiz: Can You Master ps, kill, nice & cron?