Which command-line tool in Linux displays the current amount of free and used physical memory (RAM) and swap space within the system? MCQ with Answer and Explanation

Question
Which command-line tool in Linux displays the current amount of free and used physical memory (RAM) and swap space within the system?
A. free
B. meminfo
C. top -s
D. df
Answer: Option A
Solution (By JKSSB Mock Tests)
The 'free' command parses system configuration details to quickly display total, used, and available physical memory along with swap parameters.
This question belongs to: Computer Operating Systems
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Question #1
In Windows Operating Systems, which system tool is explicitly used to optimize disk space by rearranging fragmented files into contiguous sectors?
A. Chkdsk
B. Task Manager
C. Disk Defragmenter and Optimize Drives
D. Disk Cleanup
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Correct Answer: Option C

Explanation:
Disk Defragmenter consolidates fragmented files on a hard drive to improve read/write access speeds and overall system performance.
This question belongs to: Computer Operating Systems
Question #2
What is the maximum file size supported by the NTFS file system?
A. 2 TB
B. 256 TB
C. 4 GB
D. 16 EB
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Correct Answer: Option D

Explanation:
NTFS supports file sizes up to 16 exabytes (EB) theoretically, though practical limits are lower due to implementation.
This question belongs to: Computer Operating Systems
Question #3
Which partition type is required to boot an operating system from a GPT formatted drive under UEFI firmware standards?
A. Swap Partition
B. Extended Logical Partition
C. NTFS Primary Boot Sector
D. EFI System Partition (ESP)
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Correct Answer: Option D

Explanation:
The EFI System Partition (ESP) formatted with a FAT file system contains the bootloaders, drivers, and configuration files required by UEFI firmware.
This question belongs to: Computer Operating Systems
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