City Guilds Model Questions Vol1 2025 Information Technology Question 26

Practice objective / multiple choice question 26 from the 2025 City Guilds Model Questions Vol1 Information Technology examination.

City Guilds Model Questions Vol1 2025 Information Technology Objective / Multiple Choice Medium Difficulty
Question 26 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2025 • INFORMATION_TECHNOLOGY • objective

Relation R(A,B,C,D,E) has functional dependencies: (A \rightarrow B), (BC \rightarrow D), (D \rightarrow E), (A \rightarrow C). (a) Find a minimal cover of the set of dependencies. (b) Is the decomposition of R into R1(A,B,C) and R2(C,D,E) lossless? Is it dependency‑preserving? Provide your answers.

Answer Options

A. Minimal cover: {A→B, A→C, BC→D, D→E, B→C}. Lossless: No. Dependency preserving: No.
B. Minimal cover: {A→B, A→C, BC→D}. Lossless: Yes. Dependency preserving: No.
C. Minimal cover: {A→B, BC→D, D→E}. Lossless: No. Dependency preserving: Yes.
Correct Answer D. Minimal cover: {A→B, A→C, BC→D, D→E}. Lossless: No. Dependency preserving: No.
Correct Answer
D
Correct Option:
Minimal cover: {A→B, A→C, BC→D, D→E}. Lossless: No. Dependency preserving: No.

About This Question

This is City Guilds Model Questions Vol1 2025 Information Technology Question 26. It is one of the objective questions from the 2025 City Guilds Model Questions Vol1 Information Technology examination.

Difficulty level: Medium .

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