What is the purpose of the Android 'UsbManager'? MCQ with Answer and Explanation

Question
What is the purpose of the Android 'UsbManager'?
A. To manage USB storage
B. To control USB charging
C. To detect USB devices
D. To manage USB device connections and communication
Answer: Option D
Solution (By JKSSB Mock Tests)
UsbManager provides access to USB devices connected to the Android device, allowing communication via USB.
This question belongs to: Computer Operating Systems
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Practice More Operating Systems Questions

Question #1
Which scheduling algorithm uses a fixed time slice called a 'quantum' to cycle through all ready processes in a circular fashion?
A. Shortest Remaining Time First (SRTF)
B. Round Robin (RR)
C. Non-preemptive Priority
D. First-In, First-Out (FIFO)
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Correct Answer: Option B

Explanation:
Round Robin (RR) is a preemptive scheduling algorithm that assigns each process a small fixed time quantum sequentially in a cyclic loop.
This question belongs to: Computer Operating Systems
Question #2
What is the function of the Windows 'System Configuration' (msconfig) Startup tab?
A. To change system language
B. To manage system services
C. To enable or disable programs that start automatically with Windows
D. To configure boot options
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Correct Answer: Option C

Explanation:
The Startup tab lists programs that run at startup; users can disable them to improve boot time.
This question belongs to: Computer Operating Systems
Question #3
Which of the following is a valid file permission represented in octal for a directory with rwx for owner, rx for group, and rx for others?
A. 644
B. 550
C. 755
D. 700
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Correct Answer: Option C

Explanation:
755 = owner rwx (4+2+1), group rx (4+1), others rx (4+1).
This question belongs to: Computer Operating Systems
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