Please keep at least one language enabled. || కనీసం ఒక భాషను ఎంచుకోండి.
Question 1
ప్రశ్న 1
Which statement most accurately defines an RDBMS?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• RDBMS stands for Relational Database Management System and is a DBMS based on the relational model.
• Relational data is represented through relations, commonly displayed as tables containing rows and columns.
• An RDBMS is software, not a physical storage device or a spreadsheet application.
• Relational data is represented through relations, commonly displayed as tables containing rows and columns.
• An RDBMS is software, not a physical storage device or a spreadsheet application.
వివరణ:
Question 2
ప్రశ్న 2
Which description best represents data independence as an advantage provided by database management systems?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Data independence reduces unnecessary dependence between application programs and details of how database data is organized or stored.
• Certain changes to the database implementation can therefore be made with less need to rewrite programs using the data.
• It is an important advantage of using database-management software rather than tightly coupled independent files.
• Certain changes to the database implementation can therefore be made with less need to rewrite programs using the data.
• It is an important advantage of using database-management software rather than tightly coupled independent files.
వివరణ:
Question 3
ప్రశ్న 3
Which statement correctly describes the relationship between DBMS and RDBMS?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• DBMS is the broader term for software used to manage databases.
• RDBMS refers specifically to a DBMS based on the relational model.
• Therefore every RDBMS is a DBMS, but a DBMS need not necessarily be relational.
• RDBMS refers specifically to a DBMS based on the relational model.
• Therefore every RDBMS is a DBMS, but a DBMS need not necessarily be relational.
వివరణ:
Question 4
ప్రశ్న 4
A database contains CUSTOMER and ORDER tables. CUSTOMER.Customer_ID uniquely identifies a customer, and ORDER.Customer_ID stores the corresponding customer identifier for each order. What relational concept is primarily illustrated?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Relational databases can connect data stored in different tables through corresponding key values.
• Customer_ID can identify the customer in one table and associate orders with that customer in another table.
• This allows related information to be retrieved without unnecessarily repeating all customer details in every order.
• Customer_ID can identify the customer in one table and associate orders with that customer in another table.
• This allows related information to be retrieved without unnecessarily repeating all customer details in every order.
వివరణ:
Question 5
ప్రశ్న 5
Which of the following is NOT a valid advantage that can be guaranteed merely by using an RDBMS?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• An RDBMS cannot guarantee that data will never be lost because failures, human mistakes and other incidents can still occur.
• Backup and recovery planning therefore remain important even when an RDBMS is used.
• Integrity controls, access management and organized retrieval are genuine database-management capabilities.
• Backup and recovery planning therefore remain important even when an RDBMS is used.
• Integrity controls, access management and organized retrieval are genuine database-management capabilities.
వివరణ:
Question 6
ప్రశ్న 6
Which group contains functions commonly associated with a DBMS?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• A DBMS provides mechanisms for storing, retrieving and managing database data.
• Database systems can also support authorization, integrity, concurrent use and backup/recovery operations.
• Hardware manufacturing and office-document formatting are outside the primary functions of a DBMS.
• Database systems can also support authorization, integrity, concurrent use and backup/recovery operations.
• Hardware manufacturing and office-document formatting are outside the primary functions of a DBMS.
వివరణ:
Question 7
ప్రశ్న 7
Which characteristic is most fundamental to the relational database model?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The relational model represents data in relations, which are commonly presented as two-dimensional tables.
• Rows represent individual tuples or records, while columns represent attributes.
• Multiple tables can exist and can represent related information.
• Rows represent individual tuples or records, while columns represent attributes.
• Multiple tables can exist and can represent related information.
వివరణ:
Question 8
ప్రశ్న 8
Consider the following statements:
1. A DBMS can help control unnecessary data redundancy.
2. An RDBMS represents relational data using tables.
3. Integrity rules can help maintain valid and consistent data.
4. An RDBMS is a type of DBMS.
Which statements are correct?
1. A DBMS can help control unnecessary data redundancy.
2. An RDBMS represents relational data using tables.
3. Integrity rules can help maintain valid and consistent data.
4. An RDBMS is a type of DBMS.
Which statements are correct?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• A DBMS can help reduce or control unnecessary duplication through organized data management.
• RDBMSs use the relational model, and integrity rules help maintain valid and consistent relationships and values.
• RDBMS is a specialized category within the broader DBMS concept, so all four statements are correct.
• RDBMSs use the relational model, and integrity rules help maintain valid and consistent relationships and values.
• RDBMS is a specialized category within the broader DBMS concept, so all four statements are correct.
వివరణ:
Question 9
ప్రశ్న 9
What is the most technically accurate distinction between a general DBMS and an RDBMS?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• DBMS is a general term covering software systems used to manage databases.
• An RDBMS is specifically based on the relational model of data.
• Both DBMS and RDBMS are software and both can provide data-storage and retrieval functions.
• An RDBMS is specifically based on the relational model of data.
• Both DBMS and RDBMS are software and both can provide data-storage and retrieval functions.
వివరణ:
Question 10
ప్రశ్న 10
In formal relational-database terminology, what is a row of a relation commonly called?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• A relation is represented as a table, and each row of that relation is called a tuple in relational terminology.
• A column represents an attribute.
• The tuple contains the set of attribute values describing one occurrence represented by that row.
• A column represents an attribute.
• The tuple contains the set of attribute values describing one occurrence represented by that row.
వివరణ:
Question 11
ప్రశ్న 11
Which statement about DBMS and RDBMS is incorrect?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The term DBMS is broader than RDBMS and is not restricted exclusively to the relational model.
• An RDBMS is specifically the type of DBMS that follows the relational model.
• Therefore the claim that every DBMS must use relational tables is incorrect.
• An RDBMS is specifically the type of DBMS that follows the relational model.
• Therefore the claim that every DBMS must use relational tables is incorrect.
వివరణ:
Question 12
ప్రశ్న 12
An organization repeatedly stores a customer's name, address and phone number in every ORDER record. Which relational approach can most directly reduce this unnecessary repetition?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Relational design allows information about different subjects to be stored in separate related tables.
• Customer details can be maintained in a CUSTOMER table while orders refer to the relevant customer identifier.
• This can reduce unnecessary repetition of customer details and help improve consistency.
• Customer details can be maintained in a CUSTOMER table while orders refer to the relevant customer identifier.
• This can reduce unnecessary repetition of customer details and help improve consistency.
వివరణ:
Question 13
ప్రశ్న 13
In an RDBMS, relationships between tables are commonly established and maintained using which mechanism?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Relational tables can be associated through common key values.
• A foreign key in one table can refer to a primary or unique key in another table, thereby representing a relationship.
• The logical relationship does not depend on monitor settings or the physical disk position of a row.
• A foreign key in one table can refer to a primary or unique key in another table, thereby representing a relationship.
• The logical relationship does not depend on monitor settings or the physical disk position of a row.
వివరణ:
Question 14
ప్రశ్న 14
A system stores DEPARTMENT data in one table and EMPLOYEE data in another. Each employee row contains a Department_ID that refers to the appropriate department. Which type of database system is this structure most characteristic of?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The information is organized into separate tables representing different subjects.
• Department_ID provides a logical relationship between employee and department records.
• Tables connected through such relational values are characteristic of an RDBMS.
• Department_ID provides a logical relationship between employee and department records.
• Tables connected through such relational values are characteristic of an RDBMS.
వివరణ:
Question 15
ప్రశ్న 15
Which DBMS/RDBMS characteristic is primarily concerned with ensuring that stored data remains valid, accurate and consistent according to defined rules?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Data integrity concerns the validity, accuracy and consistency of stored information.
• Database constraints and integrity rules can prevent or restrict invalid values and invalid relationships.
• Integrity is therefore a major data-management characteristic rather than a display or printing function.
• Database constraints and integrity rules can prevent or restrict invalid values and invalid relationships.
• Integrity is therefore a major data-management characteristic rather than a display or printing function.
వివరణ:
Question 16
ప్రశ్న 16
Two authorized users attempt to update information in the same database at nearly the same time. Which DBMS capability is concerned with coordinating such simultaneous database operations so that data remains consistent?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Concurrency refers to multiple database operations occurring during overlapping periods of time.
• Concurrency-control mechanisms coordinate these operations and help preserve database consistency.
• This is particularly important in shared multi-user database environments.
• Concurrency-control mechanisms coordinate these operations and help preserve database consistency.
• This is particularly important in shared multi-user database environments.
వివరణ:
Question 17
ప్రశ్న 17
Assertion (A): Storing customer information separately from order information in related tables can reduce unnecessary repetition of customer details.
Reason (R): An order record can refer to the appropriate customer through a key value instead of repeating all customer details in every order row.
Choose the correct answer.
Reason (R): An order record can refer to the appropriate customer through a key value instead of repeating all customer details in every order row.
Choose the correct answer.
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Related tables allow facts about different subjects, such as customers and orders, to be maintained separately.
• An order can identify its customer through an appropriate key rather than repeatedly storing all customer attributes.
• Both statements are therefore true, and the Reason correctly explains how the relational approach can reduce unnecessary repetition.
• An order can identify its customer through an appropriate key rather than repeatedly storing all customer attributes.
• Both statements are therefore true, and the Reason correctly explains how the relational approach can reduce unnecessary repetition.
వివరణ:
Question 18
ప్రశ్న 18
Match List I with List II:
List I
(a) DBMS
(b) RDBMS
(c) Data independence
(d) Data integrity
List II
1. Ability to change aspects of data organization with reduced impact on applications
2. General software system for managing databases
3. Maintenance of valid and consistent stored data
4. DBMS based specifically on the relational model
Choose the correct matching code.
List I
(a) DBMS
(b) RDBMS
(c) Data independence
(d) Data integrity
List II
1. Ability to change aspects of data organization with reduced impact on applications
2. General software system for managing databases
3. Maintenance of valid and consistent stored data
4. DBMS based specifically on the relational model
Choose the correct matching code.
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• DBMS is the general database-management software category, giving (a)-2.
• RDBMS is a DBMS based on the relational model, giving (b)-4.
• Data independence corresponds to reduced application dependence on data organization, while data integrity concerns valid and consistent data, giving (c)-1 and (d)-3.
• RDBMS is a DBMS based on the relational model, giving (b)-4.
• Data independence corresponds to reduced application dependence on data organization, while data integrity concerns valid and consistent data, giving (c)-1 and (d)-3.
వివరణ:
Question 19
ప్రశ్న 19
A college needs to maintain STUDENT, COURSE and ENROLLMENT data. Each student can enroll in several courses, and the system must retrieve related information without repeatedly storing complete student and course details in every place. Which solution is most appropriate?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The requirement contains structured entities and relationships among students, courses and enrollments.
• An RDBMS is designed to represent such information using related tables and appropriate keys.
• This approach supports systematic retrieval while avoiding unnecessary repetition of complete entity details.
• An RDBMS is designed to represent such information using related tables and appropriate keys.
• This approach supports systematic retrieval while avoiding unnecessary repetition of complete entity details.
వివరణ:
Question 20
ప్రశ్న 20
Consider the following statements about DBMS and RDBMS:
1. DBMS is a general term for software that manages databases.
2. RDBMS follows the relational model.
3. An RDBMS guarantees that duplicate or redundant data can never occur under any circumstances.
4. Relational tables can be associated through corresponding key values.
Which statements are correct?
1. DBMS is a general term for software that manages databases.
2. RDBMS follows the relational model.
3. An RDBMS guarantees that duplicate or redundant data can never occur under any circumstances.
4. Relational tables can be associated through corresponding key values.
Which statements are correct?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Statements 1 and 2 correctly distinguish the general DBMS concept from the relational RDBMS category.
• Statement 4 is correct because relational tables can be linked through corresponding key values.
• Statement 3 is false: relational design can control or reduce unnecessary redundancy, but an RDBMS does not make duplication impossible under all circumstances.
• Statement 4 is correct because relational tables can be linked through corresponding key values.
• Statement 3 is false: relational design can control or reduce unnecessary redundancy, but an RDBMS does not make duplication impossible under all circumstances.
వివరణ:
Answer Key సమాధానాల పట్టిక
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Question 1 ప్రశ్న 1Answer: C. A database management system based on the relational model, in which data is represented in relations commonly shown as tables సమాధానం: C.
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Question 2 ప్రశ్న 2Answer: A. The ability to modify aspects of data organization or storage with reduced impact on applications that use the data సమాధానం: A.
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Question 3 ప్రశ్న 3Answer: D. Every RDBMS is a DBMS, but the term DBMS is broader and can include systems based on models other than the relational model. సమాధానం: D.
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Question 4 ప్రశ్న 4Answer: B. Establishing a relationship between tables through corresponding key values సమాధానం: B.
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Question 5 ప్రశ్న 5Answer: A. Stored data can never be lost, so backups and recovery planning are unnecessary. సమాధానం: A.
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Question 6 ప్రశ్న 6Answer: C. Data storage and retrieval, controlled access, integrity management and facilities supporting backup or recovery సమాధానం: C.
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Question 7 ప్రశ్న 7Answer: B. Data is represented in relations, commonly shown as tables consisting of rows and columns. సమాధానం: B.
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Question 8 ప్రశ్న 8Answer: D. 1, 2, 3 and 4 సమాధానం: D.
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Question 9 ప్రశ్న 9Answer: B. DBMS is a general category of database-management systems, whereas an RDBMS specifically follows the relational model. సమాధానం: B.
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Question 10 ప్రశ్న 10Answer: C. Tuple సమాధానం: C.
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Question 11 ప్రశ్న 11Answer: D. Every DBMS must store all data exclusively as relational tables. సమాధానం: D.
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Question 12 ప్రశ్న 12Answer: A. Store customer details once in a CUSTOMER table and connect ORDER records to the appropriate customer using an identifier. సమాధానం: A.
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Question 13 ప్రశ్న 13Answer: C. Corresponding key values, such as a foreign key referring to a primary or unique key సమాధానం: C.
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Question 14 ప్రశ్న 14Answer: D. A relational database management system సమాధానం: D.
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Question 15 ప్రశ్న 15Answer: A. Data integrity సమాధానం: A.
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Question 16 ప్రశ్న 16Answer: B. Concurrency control సమాధానం: B.
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Question 17 ప్రశ్న 17Answer: D. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion. సమాధానం: D.
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Question 18 ప్రశ్న 18Answer: A. (a)-2, (b)-4, (c)-1, (d)-3 సమాధానం: A.
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Question 19 ప్రశ్న 19Answer: B. Use an RDBMS with related tables and appropriate keys representing students, courses and enrollments. సమాధానం: B.
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Question 20 ప్రశ్న 20Answer: C. 1, 2 and 4 only సమాధానం: C.