MCQ Collection
Computer Science 408 MCQs
Practice Computer Science 408 questions with answers and explanations.
Choose an option to check your answer.
Correct Answer: C. A primary key uniquely identifies each row in a table
Explanation:
Primary-key values are unique and support reliable row identification and relationships.
Choose an option to check your answer.
Correct Answer: B. DNS maps human-readable domain names to network-related records such as IP addresses
Explanation:
The Domain Name System is a distributed naming service used to resolve domains.
Choose an option to check your answer.
Correct Answer: C. Encapsulation groups data with methods and controls access to internal state
Explanation:
Encapsulation supports modular design by hiding implementation details behind a defined interface.
Choose an option to check your answer.
Correct Answer: D. Testing seeks evidence about defects and behaviour but cannot prove the complete absence of defects
Explanation:
Testing samples behaviour against expectations; exhaustive proof is usually infeasible.
Choose an option to check your answer.
Correct Answer: B. Users and processes should receive only the permissions necessary for their tasks
Explanation:
Limiting permissions reduces the impact of mistakes and compromised accounts.
Choose an option to check your answer.
Correct Answer: A. A binary digit can represent one of two states, 0 or 1
Explanation:
Binary uses base two, so each bit has two possible values and positional weights are powers of two.
Choose an option to check your answer.
Correct Answer: B. An operating system manages hardware resources and provides services to applications
Explanation:
Operating systems coordinate processes, memory, storage, devices and user/application interfaces.
Choose an option to check your answer.
Correct Answer: C. Big-O notation describes how resource use grows with input size
Explanation:
Asymptotic notation characterises growth rates rather than exact machine-specific time.
Choose an option to check your answer.
Correct Answer: A. Testing seeks evidence about defects and behaviour but cannot prove the complete absence of defects
Explanation:
Testing samples behaviour against expectations; exhaustive proof is usually infeasible.
Choose an option to check your answer.
Correct Answer: B. Users and processes should receive only the permissions necessary for their tasks
Explanation:
Limiting permissions reduces the impact of mistakes and compromised accounts.
Choose an option to check your answer.
Correct Answer: D. A binary digit can represent one of two states, 0 or 1
Explanation:
Binary uses base two, so each bit has two possible values and positional weights are powers of two.
Choose an option to check your answer.
Correct Answer: D. An operating system manages hardware resources and provides services to applications
Explanation:
Operating systems coordinate processes, memory, storage, devices and user/application interfaces.
