McqMate
Chapters
1. |
In the __________ normal form, a composite attribute is converted to individual attributes. |
A. | First |
B. | Second |
C. | Third |
D. | Fourth |
Answer» A. First |
2. |
Tables in second normal form (2NF): |
A. | Eliminate all hidden dependencies |
B. | Eliminate the possibility of a insertion anomalies |
C. | Have a composite key |
D. | Have all non key fields depend on the whole primary key |
Answer» A. Eliminate all hidden dependencies |
3. |
Which-one ofthe following statements about normal forms is FALSE? |
A. | BCNF is stricter than 3 NF |
B. | Lossless, dependency -preserving decomposition into 3 NF is always possible |
C. | Loss less, dependency – preserving decomposition into BCNF is always possible |
D. | Any relation with two attributes is BCNF |
Answer» C. Loss less, dependency – preserving decomposition into BCNF is always possible |
4. |
Functional Dependencies are the types of constraints that are based on______ |
A. | Key |
B. | Key revisited |
C. | Superset key |
D. | None of the mentioned |
Answer» A. Key |
5. |
Which is a bottom-up approach to database design that design by examining the relationship between attributes: |
A. | Functional dependency |
B. | Database modeling |
C. | Normalization |
D. | Decomposition |
Answer» C. Normalization |
6. |
Which forms simplifies and ensures that there are minimal data aggregates and repetitive groups: |
A. | 1NF |
B. | 2NF |
C. | 3NF |
D. | All of the mentioned |
Answer» C. 3NF |
7. |
Which forms has a relation that possesses data about an individual entity: |
A. | 2NF |
B. | 3NF |
C. | 4NF |
D. | 5NF |
Answer» C. 4NF |
8. |
Which forms are based on the concept of functional dependency: |
A. | 1NF |
B. | 2NF |
C. | 3NF |
D. | 4NF |
Answer» C. 3NF |
9. |
Empdt1(empcode, name, street, city, state, pincode). For any pincode, there is only one city and state. Also, for given street, city and state, there is just one pincode. In normalization terms, empdt1 is a relation in |
A. | 1 NF only |
B. | 2 NF and hence also in 1 NF |
C. | 3NF and hence also in 2NF and 1NF |
D. | BCNF and hence also in 3NF, 2NF and 1NF |
Answer» B. 2 NF and hence also in 1 NF |
10. |
We can use the following three rules to find logically implied functional dependencies. This collection of rules is called |
A. | Axioms |
B. | Armstrong’s axioms |
C. | Armstrong |
D. | Closure |
Answer» B. Armstrong’s axioms |
11. |
Which of the following is not Armstrong’s Axiom? |
A. | Reflexivity rule |
B. | Transitivity rule |
C. | Pseudotransitivity rule |
D. | Augmentation rule |
Answer» C. Pseudotransitivity rule |
12. |
The relation employee(ID,name,street,Credit,street,city,salary) is decomposed into
|
A. | Lossless decomposition |
B. | Lossless-join decomposition |
C. | All of the mentioned |
D. | None of the mentioned |
Answer» D. None of the mentioned |
13. |
Inst_dept (ID, name, salary, dept name, building, budget) is decomposed into instructor (ID, name, dept name, salary) department (dept name, building, budget) This comes under |
A. | Lossy-join decomposition |
B. | Lossy decomposition |
C. | Lossless-join decomposition |
D. | Both Lossy and Lossy-join decomposition |
Answer» D. Both Lossy and Lossy-join decomposition |
14. |
There are two functional dependencies with the same set of attributes on the left side of the arrow:
|
A. | A->BC |
B. | A->B |
C. | B->C |
D. | None of the mentioned |
Answer» A. A->BC |
15. |
Consider a relation R(A,B,C,D,E) with the following functional dependencies:
|
A. | 2 |
B. | 7 |
C. | 10 |
D. | 12 |
Answer» C. 10 |
16. |
Which, if any, of the two queries above will correctly (in SQL2) get the desired set of employee ID’s? |
A. | Both I and II |
B. | I only |
C. | II only |
D. | Neither I nor I |
Answer» A. Both I and II |
17. |
Suppose now that R(A,B:) and S(A,B:) are two relations with r and s tuples, respectively
|
A. | m = min(r,s) |
B. | 0 <= m <= r + s |
C. | min(r,s) <= m <= max(r,s) |
D. | 0 <= m <= min(r,s) |
Answer» D. 0 <= m <= min(r,s) |
18. |
Which of the following is not a key? |
A. | A |
B. | E |
C. | B, C |
D. | D |
Answer» C. B, C |
19. |
If a relation is in BCNF, then it is also in |
A. | 1 NF |
B. | 2 NF |
C. | 3 NF |
D. | All of the above |
Answer» D. All of the above |
20. |
What action does ⋈ operator perform in relational algebra |
A. | Output specified attributes from all rows of the input relation and remove duplicate tuples from the output |
B. | Outputs pairs of rows from the two input relations that have the same value on all attributes that have the same name |
C. | Output all pairs of rows from the two input relations (regardless of whether or not they have the same values on common attributes) |
D. | Return rows of the input relation that satisfy the predicate |
Answer» A. Output specified attributes from all rows of the input relation and remove duplicate tuples from the output |
21. |
Statement 1: A tuple is a row in a relation Statement 2: Existence of multiple foreign keys in a same relation is possible |
A. | Both the statements are true |
B. | Statement 1 is correct but Statement 2 is false |
C. | Statement 1 is false but Statement 2 is correct |
D. | Both the statements are false |
Answer» A. Both the statements are true |
22. |
The____condition allows a general predicate over the relations being joined. |
A. | On |
B. | Using |
C. | Set |
D. | Where |
Answer» A. On |
23. |
Which of the join operations do not preserve non matched tuples? |
A. | Left outer join |
B. | Right outer join |
C. | Inner join |
D. | Natural join |
Answer» B. Right outer join |
24. |
The normal form which satisfies multivalued dependencies and which is in BCNF is |
A. | 4 NF |
B. | 3 NF |
C. | 2 NF |
D. | All of the mentioned |
Answer» A. 4 NF |
25. |
Which of the following is a tuple-generating dependencies? |
A. | Functional dependency |
B. | Equality-generating dependencies |
C. | Multivalued dependencies |
D. | Non-functional dependency |
Answer» B. Equality-generating dependencies |
26. |
The main task carried out in the __________ is to remove repeating attributes to separate tables. |
A. | First Normal Form |
B. | Second Normal Form |
C. | Third Normal Form |
D. | Fourth Normal Form |
Answer» A. First Normal Form |
27. |
Which forms has a relation that possesses data about an individual entity? |
A. | 2NF |
B. | 3NF |
C. | 4NF |
D. | 5NF |
Answer» B. 3NF |
28. |
Which of the following has each related entity set has its own schema and there is an additional schema for the relationship set? |
A. | A many-to-many relationship set |
B. | A multivalued attribute of an entity set |
C. | A one-to-many relationship set |
D. | None of the mentioned |
Answer» A. A many-to-many relationship set |
29. |
Fifth Normal form is concerned with |
A. | Functional dependency |
B. | Multivalued dependency |
C. | Join dependency |
D. | Domain-key |
Answer» B. Multivalued dependency |
30. |
n which of the following, a separate schema is created consisting of that attribute and the primary key of the entity set. |
A. | A many-to-many relationship set |
B. | A multivalued attribute of an entity set |
C. | A one-to-many relationship set |
D. | None of the mentioned |
Answer» B. A multivalued attribute of an entity set |
31. |
In 2NF |
A. | No functional dependencies (FDs) exist |
B. | No multivalued dependencies (MVDs) exist |
C. | No partial FDs exist |
D. | No partial MVDs exist |
Answer» B. No multivalued dependencies (MVDs) exist |
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