Build a stronger foundation with 50 software engineering principles MCQs with answers and explanations. The quiz covers abstraction, modularity, information hiding, cohesion, coupling, simplicity, reuse, quality-focused practices, and professional responsibility. It is suitable for university exams, teaching tests, and software-development interviews.
Good software does not depend only on correct code. It also depends on principles that keep systems understandable, changeable, testable, safe, and professionally responsible throughout their useful life.
Want to test yourself? Select one answer for each question and avoid opening the optional answer explanations while you play. When you reach the end, tap “See Answers & My Score” to reveal all correct answers, explanations, and your final result automatically.
- ✔ Abstraction and modularity
- ✔ Information hiding and encapsulation
- ✔ Cohesion and coupling
- ✔ Separation of concerns
- ✔ Simplicity, reuse and changeability
- ✔ Reviews, standards and refactoring
- ✔ Quality attributes and defensive practice
- ✔ Professional competence and ethics
- 1. Abstraction, Modularity and Decomposition MCQs (Q1–10)
- 2. Cohesion, Coupling and Interface Principles MCQs (Q11–20)
- 3. Simplicity, Reuse and Change-Friendly Design MCQs (Q21–30)
- 4. Quality-Focused Development Practices MCQs (Q31–40)
- 5. Professional and Ethical Practice MCQs (Q41–50)
- Frequently Asked Questions
1. Abstraction, Modularity and Decomposition MCQs (Q1–10)
ABSTRACTION, MODULARITY AND DECOMPOSITIONReview ten focused questions on abstraction, modularity and decomposition, then open each answer to check the reasoning.
1. Which of the following is not the characteristic of a software?
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Correct Answer: C — Software is always correct. Software can contain defects, so it is never assumed to be automatically correct. Unlike hardware, it is developed rather than manufactured and does not physically wear out.
2. Which software engineering term best matches this description: focusing on essential properties while suppressing unnecessary implementation detail.
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Correct Answer: A — Abstraction. Focusing on essential properties while suppressing unnecessary implementation detail.
3. A large application is separated into billing, inventory, reporting, and authentication components. Which concept is being applied?
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Correct Answer: D — Modularity. Dividing software into manageable components with clear responsibilities and interfaces.
4. What does Separation of concerns primarily mean in software engineering?
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Correct Answer: D — organising different responsibilities so that each can be understood and changed with limited interference.. Organising different responsibilities so that each can be understood and changed with limited interference.
5. A team wants to achieve the following outcome: concealing design decisions that are likely to change behind stable interfaces. Which concept should it emphasize?
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Correct Answer: C — Information hiding. Concealing design decisions that are likely to change behind stable interfaces.
6. Which software engineering term best matches this description: bundling data with the operations that control access to that data.
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Correct Answer: C — Encapsulation. Bundling data with the operations that control access to that data.
7. A validation component can be tested and changed without modifying unrelated reporting code. Which concept is being applied?
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Correct Answer: A — Functional independence. Designing modules so each performs a focused function and has minimal dependence on others.
8. Which software engineering term best matches this description: developing a solution by repeatedly expanding high-level functions into more detailed steps.
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Correct Answer: C — Stepwise refinement. Developing a solution by repeatedly expanding high-level functions into more detailed steps.
9. A team divides a travel platform into booking, pricing, payment, and customer-support areas. Which concept is being applied?
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Correct Answer: A — Problem decomposition. Breaking a complex problem into smaller, more manageable subproblems.
10. Invoice calculation and email delivery are placed in separate components. Which concept is being applied?
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Correct Answer: D — Single Responsibility Principle. Giving a software unit one primary reason to change.
2. Cohesion, Coupling and Interface Principles MCQs (Q11–20)
COHESION, COUPLING AND INTERFACE PRINCIPLESReview ten focused questions on cohesion, coupling and interface principles, then open each answer to check the reasoning.
11. Which term best matches this description: The ease with which software can be moved to another platform or environment.
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Correct Answer: C — Portability. The ease with which software can be moved to another platform or environment.
12. Select the term that best fits the following definition: The ability of software to perform required functions without failure for a stated period.
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Correct Answer: B — Reliability. The ability of software to perform required functions without failure for a stated period.
13. What are attributes of good software?
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Correct Answer: D — Software maintainability & functionality. Good software should provide required functionality and also remain dependable, efficient, usable, and maintainable.
14. Efficiency in a software product does not include _____?
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Correct Answer: B — licensing. Efficiency concerns response time, processing time, and resource use. Licensing is a legal or commercial issue, not a performance attribute.
15. What does High cohesion primarily mean in software engineering?
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Correct Answer: C — keeping closely related responsibilities together within the same module.. Keeping closely related responsibilities together within the same module.
16. A team wants to achieve the following outcome: minimising unnecessary dependencies between modules. Which concept should it emphasize?
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Correct Answer: C — Low coupling. Minimising unnecessary dependencies between modules.
17. What does Interface Segregation Principle primarily mean in software engineering?
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Correct Answer: D — providing clients with small focused interfaces instead of forcing them to depend on unused operations.. Providing clients with small focused interfaces instead of forcing them to depend on unused operations.
18. What does Principle of least privilege primarily mean in software engineering?
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Correct Answer: B — granting a user or component only the permissions required for its task.. Granting a user or component only the permissions required for its task.
19. A team wants to achieve the following outcome: denying access or stopping safely unless permission or a valid condition is explicitly established. Which concept should it emphasize?
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Correct Answer: B — Fail-safe defaults. Denying access or stopping safely unless permission or a valid condition is explicitly established.
20. Which software engineering term best matches this description: the degree to which specified users can achieve goals effectively, efficiently, and satisfactorily.
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Correct Answer: C — Usability. The degree to which specified users can achieve goals effectively, efficiently, and satisfactorily.
3. Simplicity, Reuse and Change-Friendly Design MCQs (Q21–30)
SIMPLICITY, REUSE AND CHANGE-FRIENDLY DESIGNReview ten focused questions on simplicity, reuse and change-friendly design, then open each answer to check the reasoning.
21. Software deteriorates rather than wears out because _____?
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Correct Answer: B — Multiple change requests introduce errors in component interactions. Software does not physically wear out, but repeated changes can introduce faults and make its structure harder to maintain.
22. An application runs on Windows and Linux with only small configuration changes. Which concept best fits this situation?
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Correct Answer: B — Portability. The application is portable because it can operate across platforms with limited modification.
23. Software compatibility means _____?
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Correct Answer: C — Being able to use existing programs with the new program. Software compatibility means that existing programs or data can work correctly with a new platform or application. The key point is continued interoperability rather than simply connecting machines.
24. What does Simplicity primarily mean in software engineering?
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Correct Answer: A — choosing the least complicated design that adequately satisfies current requirements.. Choosing the least complicated design that adequately satisfies current requirements.
25. A team wants to achieve the following outcome: avoiding duplicated knowledge or logic by keeping one authoritative representation. Which concept should it emphasize?
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Correct Answer: C — DRY principle. Avoiding duplicated knowledge or logic by keeping one authoritative representation.
26. Which software engineering term best matches this description: not building speculative functionality before a real requirement exists.
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Correct Answer: C — YAGNI principle. Not building speculative functionality before a real requirement exists.
27. A team wants to achieve the following outcome: structuring software so likely future modifications are localised and controlled. Which concept should it emphasize?
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Correct Answer: B — Design for change. Structuring software so likely future modifications are localised and controlled.
28. Which software engineering term best matches this description: preferring proven reusable assets when they satisfy the need and their risks are understood.
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Correct Answer: C — Software reuse principle. Preferring proven reusable assets when they satisfy the need and their risks are understood.
29. Every screen uses the same date format, labels, and navigation pattern. Which concept is being applied?
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Correct Answer: C — Consistency. Using compatible terminology, conventions, behaviour, and representations across a product.
30. What does Interoperability primarily mean in software engineering?
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Correct Answer: B — the ability of systems or components to exchange and meaningfully use information.. The ability of systems or components to exchange and meaningfully use information.
4. Quality-Focused Development Practices MCQs (Q31–40)
QUALITY-FOCUSED DEVELOPMENT PRACTICESReview ten focused questions on quality-focused development practices, then open each answer to check the reasoning.
31. Which software engineering term best matches this description: anticipating invalid inputs and unexpected states so failures are handled safely.
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Correct Answer: C — Defensive programming. Anticipating invalid inputs and unexpected states so failures are handled safely.
32. A team uses one documented naming and formatting convention across the codebase. Which concept is being applied?
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Correct Answer: C — Coding standards. Agreed rules for source-code structure, naming, formatting, and common practices.
33. What does Peer review primarily mean in software engineering?
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Correct Answer: D — evaluation of a work product by colleagues to find defects and improve quality before later stages.. Evaluation of a work product by colleagues to find defects and improve quality before later stages.
34. A team wants to achieve the following outcome: systematic examination of source-code changes by another developer or team. Which concept should it emphasize?
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Correct Answer: D — Code review. Systematic examination of source-code changes by another developer or team.
35. Which software engineering term best matches this description: improving the internal structure of code without intentionally changing its externally observable behaviour.
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Correct Answer: D — Refactoring. Improving the internal structure of code without intentionally changing its externally observable behaviour.
36. A rushed workaround saves a day now but will make every later change harder. Which concept is being applied?
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Correct Answer: A — Technical debt. The future cost created when a quick or weak technical solution is chosen over a more sustainable one.
37. What does Testability primarily mean in software engineering?
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Correct Answer: D — the degree to which software makes it practical to establish tests and observe their results.. The degree to which software makes it practical to establish tests and observe their results.
38. A team wants to achieve the following outcome: the ability of software to continue operating acceptably when faced with invalid input or stressful conditions. Which concept should it emphasize?
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Correct Answer: B — Robustness. The ability of software to continue operating acceptably when faced with invalid input or stressful conditions.
39. A web form supports keyboard navigation, labels, and screen-reader use. Which concept is being applied?
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Correct Answer: B — Accessibility. Designing software so people with different abilities can perceive, understand, navigate, and operate it.
40. A team wants to achieve the following outcome: the ability of a system to handle increased workload or users without unacceptable loss of service. Which concept should it emphasize?
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Correct Answer: A — Scalability. The ability of a system to handle increased workload or users without unacceptable loss of service.
5. Professional and Ethical Practice MCQs (Q41–50)
PROFESSIONAL AND ETHICAL PRACTICEReview ten focused questions on professional and ethical practice, then open each answer to check the reasoning.
41. The ease with which software can be corrected, adapted, or improved. This is known as _____?
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Correct Answer: A — Maintainability. The ease with which software can be corrected, adapted, or improved.
42. A team can add a tax rule without changing unrelated modules. Which term most accurately describes it?
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Correct Answer: A — Maintainability. The design demonstrates maintainability because changes can be made with limited effort and risk.
43. A project team reports the following: A payment service completes transactions correctly for months with very few failures. Which concept is illustrated?
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Correct Answer: A — Reliability. The service is reliable because it performs consistently without unexpected failure.
44. Select the term that best fits the following definition: The ethical duty to protect society, safety, privacy, and welfare when making professional decisions.
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Correct Answer: A — Public interest. The ethical duty to protect society, safety, privacy, and welfare when making professional decisions.
45. Explain what is meant by PRODUCT with reference to one of the eight principles as per the ACM/IEEE code of Ethics?
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Correct Answer: D — Software engineers shall ensure that their products and related modifications meet the highest professional standards possible. Professional practice requires software engineers to protect the public, act honestly, and maintain high technical and ethical standards.
46. A project team reports the following: An engineer delays a release after discovering a defect that could expose customer medical data. Which concept is illustrated?
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Correct Answer: B — Public interest. The decision protects the public interest by placing safety and privacy ahead of schedule pressure.
47. Which software engineering term best matches this description: accepting and performing work only with appropriate knowledge, skill, preparation, and care.
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Correct Answer: D — Professional competence. Accepting and performing work only with appropriate knowledge, skill, preparation, and care.
48. A developer does not share customer records obtained during system maintenance. Which concept is being applied?
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Correct Answer: C — Confidentiality. Protecting information entrusted by clients, employers, users, or the public unless disclosure is properly authorised or required.
49. What does Honest estimation primarily mean in software engineering?
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Correct Answer: C — communicating realistic cost, effort, schedule, and uncertainty instead of promising knowingly impossible results.. Communicating realistic cost, effort, schedule, and uncertainty instead of promising knowingly impossible results.
50. A team wants to achieve the following outcome: revealing personal or financial interests that could improperly influence professional judgement. Which concept should it emphasize?
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Correct Answer: C — Conflict of interest disclosure. Revealing personal or financial interests that could improperly influence professional judgement.
💬 How many did you get right? Share your score in the comments and mention the topic you want to practise next.
- Set 1: Introduction to Software Engineering
- Set 3: Software Processes and Framework Activities
- Set 4: Requirements Engineering Fundamentals
- Set 5: Requirements Elicitation and Analysis
- Set 6: SRS, Validation and Requirements Management
- Set 7: SDLC and Traditional Process Models
- Set 8: Evolutionary and Rapid Development Models
Frequently Asked Questions
Which principles are covered in Set 2?▾
The set covers abstraction, modularity, information hiding, decomposition, cohesion, coupling, simplicity, reuse, quality-focused practices, and professional responsibility.
Why are high cohesion and low coupling preferred?▾
High cohesion keeps related responsibilities together, while low coupling reduces unnecessary dependencies. Together they make modules easier to understand, test, reuse, and change.
Is refactoring the same as adding a new feature?▾
No. Refactoring improves internal structure without intentionally changing externally observable behaviour, while a feature adds or changes user-visible capability.
What is information hiding?▾
Information hiding conceals design decisions that are likely to change behind stable interfaces so other modules do not depend on internal details.
Do software engineering ethics matter in technical exams?▾
Yes. Professional responsibility, public interest, competence, confidentiality, honesty, and conflicts of interest are recognised parts of software engineering practice.
Are these questions useful for interviews?▾
Yes. The set reviews design judgement, quality attributes, code practices, and professional scenarios that commonly appear in academic and entry-level interviews.
This article is an independently created educational resource for software engineering practice. Questions are based on established software engineering concepts and have been rewritten for learning and exam preparation. The page is not affiliated with or endorsed by any university, examination board, certification provider, IEEE, ACM, ISO, NASA, or textbook publisher.
