[ Database ]

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[ Database ]

Useful GK for JPSC, JSSC, JET, Jharkhand Police and other exams.

51. एक ही प्रकार की entities का group क्या कहलाता है?

[A] Relation set

[B] Tuples

[C] Entity set

[D] ER model

51. Set of entities of same type is called?

[A] Relation set

[B] Tuples

[C] Entity set

[D] ER model

सही उत्तर: Entity set

व्याख्या: Same type entities का समूह entity set कहलाता है

Correct Answer: Entity set

Explanation: Group of similar entities

52. Data की information को क्या कहते हैं?

[A] Hyper data

[B] Tera data

[C] Metadata

[D] Relations

52. What is information about data called?

[A] Hyper data

[B] Tera data

[C] Metadata

[D] Relations

सही उत्तर: Metadata

व्याख्या: Data के बारे में information metadata है

Correct Answer: Metadata

Explanation: Information about data

53. RDBMS किसका collection है?

[A] Records

[B] Keys

[C] Tables

[D] Fields

53. What does RDBMS consist of?

[A] Records

[B] Keys

[C] Tables

[D] Fields

सही उत्तर: Tables

व्याख्या: RDBMS tables का collection होता है

Correct Answer: Tables

Explanation: Collection of tables

54. Referential integrity किसे ensure करता है?

[A] Referencing constraint

[B] Primary key

[C] Referential

[D] Specific

54. Which integrity constraint ensures consistency?

[A] Referencing constraint

[B] Primary key

[C] Referential

[D] Specific

सही उत्तर: Referential

व्याख्या: Tables के बीच consistency

Correct Answer: Referential

Explanation: Ensures consistency

55. DBMS के लिए सबसे important hardware क्या है?

[A] Microphone

[B] Disk storage

[C] Display

[D] Printer

55. Most important hardware for DBMS?

[A] Microphone

[B] Disk

[C] Display

[D] Printer

सही उत्तर: Disk storage

व्याख्या: High speed disk required

Correct Answer: Disk storage

Explanation: Required for storage

56. DBMS किसके बीच interface है?

[A] Data & DBMS

[B] Application & SQL

[C] App & DB

[D] User & Software

56. DBMS acts as interface between?

[A] Data & DBMS

[B] Application & SQL

[C] App & DB

[D] User & Software

सही उत्तर: Database application & database

व्याख्या: User और database के बीच interface

Correct Answer: Database application & database

Explanation: Interface between app and DB

57. SQL operations किसमें आते हैं?

[A] TCL

[B] DCL

[C] DDL

[D] DML

57. Which allows insert/update/delete?

[A] TCL

[B] DCL

[C] DDL

[D] DML

सही उत्तर: DML

व्याख्या: Data manipulate करने के लिए

Correct Answer: DML

Explanation: Data manipulation language

58. Unique record identify करने वाला set?

[A] Primary key

[B] Foreign key

[C] Super key

[D] Candidate key

58. Set that uniquely identifies record?

[A] Primary key

[B] Foreign key

[C] Super key

[D] Candidate key

सही उत्तर: Super key

व्याख्या: Unique identification

Correct Answer: Super key

Explanation: Identifies record uniquely

59. Table delete करने का command?

[A] Drop table

[B] Delete

[C] Purge

[D] Remove

59. Which command removes relation?

[A] Drop table

[B] Delete

[C] Purge

[D] Remove

सही उत्तर: Drop table

व्याख्या: Structure हटाता है

Correct Answer: Drop table

Explanation: Deletes table

60. Weak entity किससे related होता है?

[A] Neighbour set

[B] Strong entity

[C] Owner set

[D] Identifying set

60. Weak entity associated with?

[A] Neighbour set

[B] Strong entity

[C] Owner set

[D] Identifying set

सही उत्तर: Identifying set

व्याख्या: Weak entity identifying entity पर depend करता है

Correct Answer: Identifying set

Explanation: Dependent on identifying set