Which Linux command is used to check the disk space usage of the root file system? MCQ with Answer and Explanation

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Which Linux command is used to check the disk space usage of the root file system?

A. fdisk -l

B. df -h /

C. du -sh /

D. lsblk /

Answer: Option B

Solution (By JKSSB Mock Tests)

df -h / shows used/available space on the root partition; du -sh / calculates total size of all files under /, which is heavy.

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What is the name of the software layer in Android that provides standard interfaces to expose device hardware capabilities to the higher-level Java API framework?

A. Android Runtime (ART)

B. Hardware Abstraction Layer (HAL)

C. Linux Kernel

D. Native C/C++ Libraries

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Correct Answer: Option B

Explanation:
The Hardware Abstraction Layer (HAL) defines a standard interface for hardware vendors to implement, enabling higher-level Android framework APIs to interact with hardware.

This question belongs to: Computer Operating Systems