In Linux, the 'at' command is used to: MCQ with Answer and Explanation

Question
In Linux, the 'at' command is used to:
A. Schedule a job to run once at a specified time
B. List scheduled jobs
C. Run jobs immediately
D. Schedule recurring jobs
Answer: Option A
Solution (By JKSSB Mock Tests)
at schedules one-time tasks; cron is for recurring jobs; atq lists pending at jobs.
This question belongs to: Computer Operating Systems
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Practice More Operating Systems Questions

Question #1
Which structural concept refers to a piece of code that must execute atomically and cannot be accessed by more than one process at any given moment?
A. System Hook
B. Deadlock Loop
C. Critical Section
D. Shared Page Room
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Correct Answer: Option C

Explanation:
The Critical Section is a structural segment of program code that accesses shared resources or variables and must not be concurrently executed by multiple processes.
This question belongs to: Computer Operating Systems
Question #2
Which memory location holds the addresses of various Interrupt Service Routines (ISRs) to handle specific hardware triggers?
A. Windows Registry Base
B. Process Control Block (PCB)
C. Interrupt Vector Table (IVT)
D. Virtual Swap Block
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Correct Answer: Option C

Explanation:
The Interrupt Vector Table maps specific interrupt signal identifier numbers directly to the memory locations of their respective Interrupt Service Routines.
This question belongs to: Computer Operating Systems
Question #3
Which Windows tool displays comprehensive diagnostic indicators detailing live CPU, memory, disk, and network parameters broken down by individual process IDs?
A. Registry Base Applet
B. Device Manager Panel
C. Resource Monitor
D. System Restore Console
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Correct Answer: Option C

Explanation:
Resource Monitor expands on basic Task Manager metrics, providing fine-grained real-time tracking of handle bounds, disk channel usage, and network sockets.
This question belongs to: Computer Operating Systems
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