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Welcome to the DBMS MCQs Page

Dive deep into the fascinating world of DBMS with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of DBMS, a crucial aspect of UGC CBSE NET Exam. In this section, you will encounter a diverse range of MCQs that cover various aspects of DBMS, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within UGC CBSE NET Exam.

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Check out the MCQs below to embark on an enriching journey through DBMS. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of UGC CBSE NET Exam.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of DBMS. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

DBMS MCQs | Page 16 of 23

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Q151.
Which of the following statement is wrong?

I. 2-phase locking protocol suffer from dead lock.
II. Time stamp protocol suffer from more aborts.
III. A block hole in a DFD is a data store with only inbound flows.
IV. Multivalued dependency among attribute is checked at 3 NF level.
V. An entity-relationship diagram is a tool to represent event model.

a.

I, II, II

b.

II, III, IV

c.

III, IV, V

d.

II, IV, V

Discuss
Answer: (c).III, IV, V
Q152.
The name of the transaction file shall be provided by the operator and the file that contains the edited transactions ready for execution shall be called

a.

Batch. Exe

b.

Trans. Exe

c.

Opt. Exe

d.

Edit.Exe

Discuss
Answer: (c).Opt. Exe
Q153.
(i) DML includes a query language based on both relation algebra and tuple calculus
(ii) DML includes a query language based on tuple calculus
(iii) DML includes a query language based on relational algebra
(iv) DML includes a query language based on none of the relational algebra and tuple calculus

Which one is correct?

a.

(i) only

b.

(ii) only

c.

(iii) only

d.

(iv) only

Discuss
Answer: (a).(i) only
Q154.
Which construct in SQL is used to test whether a subquery has any tuples in its result?

a.

UNIQUE

b.

EXISTS

c.

GROUP BY

d.

EXCEPT

Discuss
Answer: (b).EXISTS
Q155.
An entity has:

(i) a set of properties
(ii) a set of properties and values for all the properties
(iii) a set of properties and the values for some set of properties may non-uniquely identify an entity
(iv) a set of properties and the values for some set of properties may uniquely identify an entity

Which of the above are valid?

a.

(i) only

b.

(ii) only

c.

(iii) only

d.

(iv) only

Discuss
Answer: (d).(iv) only
Q156.
Aggregation is:

a.

an abstraction through which relationships are treated as lower level entities

b.

an abstraction through which relationships are treated as higher level entities

c.

an abstraction through which relationships are not treated at all as entities

d.

none of the above

Discuss
Answer: (b).an abstraction through which relationships are treated as higher level entities
Q157.
Suppose R is a relation schema and F is a set of functional dependencies on R. Further, suppose R1 and R2 form a decomposition of R. Then the decomposition is a lossless join decomposition of R provided that:

a.

R1∩R2→R1 is in F+

b.

R1∩R2→R2 is in F+

c.

both R1∩R2→R1 and R1∩R2→R2 functional dependencies are in F+

d.

at least one from R1∩R2→R1 and R1∩R2→R2 is in F+

Discuss
Answer: (d).at least one from R1∩R2→R1 and R1∩R2→R2 is in F+
Q158.
In a heap, every element is …………… of all the elements in the subtree.

a.

maximum

b.

minimum

c.

sum

d.

product

Discuss
Answer: (a).maximum
Q159.
A superkey for an entity consists of:

a.

one attribute only

b.

at least two attributes

c.

at most two attributes

d.

one or more attributes

Discuss
Answer: (d).one or more attributes
Q160.
Which of the following set of keywords constitutes a mapping in SQL?

a.

SELECT, FROM, TABLE

b.

SELECT, FROM, WHERE

c.

CONNECT, TABLE, CREATE

d.

SELECT, TABLE, INSERT

Discuss
Answer: (b).SELECT, FROM, WHERE
Page 16 of 23

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