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GK One-Line Question & Answer

15541+ short questions with short answers, covering every category and sub-category on the site — no long articles to scroll through. Good for a fast recap before an exam, or a few minutes of daily practice.

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Computer Fundamentals → Introduction to Computer 37

802.11g maximum speed is?
54 Mbps
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802.11n (Wi-Fi 4) maximum speed is?
Up to 600 Mbps
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802.11ac (Wi-Fi 5) operates on?
5 GHz only
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Computer forensics is used for?
Investigating digital crimes and evidence
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Chain of custody in forensics ensures?
Integrity of evidence from collection to court
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Which hashing algorithm is recommended for password storage?
bcrypt/SHA-256+salt
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Salting a password before hashing?
Prevents identical passwords from having identical hashes
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PKI stands for?
Public Key Infrastructure
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In asymmetric encryption, data encrypted with public key can only be decrypted by?
The corresponding private key
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Which standard defines digital certificates?
X.509
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Kerberos is used for?
Network authentication protocol
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LDAP stands for?
Lightweight Directory Access Protocol
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Active Directory is a service by?
Microsoft
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Which command tests DNS resolution in Windows?
nslookup
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A white hat hacker is?
Ethical hacker testing with permission
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Black hat hacker is?
Malicious hacker breaking laws
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Social engineering attacks target?
Human psychology to obtain information
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Which key is used to access BIOS on most PCs?
F1, Del, or Esc (at boot)
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Secure Boot prevents?
Booting unauthorized/unsigned OS or bootloaders
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UEFI is the modern replacement for?
BIOS
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Which Windows feature creates system restore points?
System Restore
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The clock cycle is the basic unit of?
CPU operation timing
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IPC stands for in OS?
Inter-Process Communication
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Shared memory IPC?
Allows direct memory access between processes
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Message passing IPC?
Processes communicate by sending/receiving messages
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Fork() system call in Unix?
Creates a copy of the calling process
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exec() system call?
Replaces current process image with new program
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A race condition occurs when?
Two processes access shared resource simultaneously causing incorrect results
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Critical section problem solution requires?
Mutual exclusion, progress, bounded waiting
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Peterson's algorithm solves?
Critical section problem for two processes
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Which scheduling is preemptive?
Round Robin
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Convoy effect is a problem in?
FCFS scheduling
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Starvation in scheduling means?
Process waits indefinitely due to low priority
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Aging technique in scheduling?
Increases process priority over time to prevent starvation
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Banker's algorithm is used to?
Avoid deadlock by resource allocation checking
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Which of the following is a deadlock avoidance strategy?
Banker's algorithm
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LRU page replacement algorithm replaces?
Least recently used page
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Computer Fundamentals → Computer Security 1

Ethical hacking is also called?
Penetration testing
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Computer Fundamentals → Operating System Basics 1

Which is a real-time operating system example?
VxWorks
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Computer Fundamentals → Output Devices 1

Monitor in OS synchronization is?
High-level synchronization construct
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