In Android, the 'back stack' is used to: MCQ with Answer and Explanation

Question
In Android, the 'back stack' is used to:
A. Manage the navigation history of activities
B. Hold background services
C. Cache recent apps
D. Store system logs
Answer: Option A
Solution (By JKSSB Mock Tests)
Android uses a back stack to keep track of activities launched; pressing back pops the top activity.
This question belongs to: Computer Operating Systems
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Question #1
Which of the following Android components represents a background service without a user interface, designed to perform long-running tasks like fetching web data or playing audio?
A. Content Provider
B. Service
C. Activity
D. Broadcast Receiver
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Correct Answer: Option B

Explanation:
An Android 'Service' is an application component designed to handle background tasks (like music playback or network synchronization) without an explicit user interface.
This question belongs to: Computer Operating Systems
Question #2
What is the primary difference between UEFI and BIOS?
A. UEFI is only for Windows, BIOS for Linux
B. UEFI is a newer firmware standard with a graphical interface and Secure Boot
C. BIOS supports GPT, UEFI supports MBR
D. BIOS is for 32-bit systems, UEFI for 64-bit
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Correct Answer: Option B

Explanation:
UEFI replaces BIOS with advanced features like Secure Boot, faster boot, and support for large disks.
This question belongs to: Computer Operating Systems
Question #3
Which Windows feature allows you to revert the system to a previous state without affecting personal files?
A. Reset this PC
B. Backup and Restore
C. System Restore
D. File History
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Correct Answer: Option C

Explanation:
System Restore restores system files and settings to a previous restore point, preserving personal documents.
This question belongs to: Computer Operating Systems
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