डाटाबेस र DBMS – Database & DBMS MCQ
डाटाबेस र DBMS – कम्प्युटर र IT
Database & DBMS · Computer & IT (Technical) · ५६३ प्रश्न
५६३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
डाटाबेस र DBMS: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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Creating a higher-level entity set, such as 'Vehicle', from lower-level entity sets such as 'Car' and 'Bus' by extracting their common features is called:
सही उत्तर: ग) Generalization
Generalization is a bottom-up process combining common attributes into a superclass; specialization is the reverse, top-down process.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The attribute that distinguishes weak entities belonging to the same owner entity, shown with a dashed underline, is called the:
सही उत्तर: ख) Partial key (discriminator)
A weak entity is identified by its owner's key combined with its partial key (discriminator).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The relationship between a weak entity set and its owner (identifying) entity set is shown in an ER diagram by a:
सही उत्तर: क) Double diamond
An identifying relationship is drawn as a double diamond; the weak entity itself is a double rectangle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an ER diagram, a double line connecting an entity set to a relationship set indicates:
सही उत्तर: घ) Total participation of that entity set in the relationship
Total participation means every entity in the set must take part in at least one relationship instance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an ER diagram, the key (identifying) attribute of an entity is shown by:
सही उत्तर: ग) Underlining the attribute name
The primary key attribute's name is underlined inside its ellipse.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an ER diagram, a derived attribute such as 'Age' (calculated from date of birth) is shown by a:
सही उत्तर: ख) Dashed ellipse
A dashed ellipse marks a derived attribute whose value can be computed from other attributes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The network data model, standardised by CODASYL, differs from the hierarchical model because it:
सही उत्तर: क) Allows a record to have more than one parent (owner)
The network model represents data as a graph of records and sets, so a member record can belong to several owners, supporting many-to-many relationships.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The hierarchical data model organises data in the form of a:
सही उत्तर: घ) Tree structure with parent-child records
In the hierarchical model (e.g., IBM's IMS) each child record has exactly one parent, forming a tree.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A new attribute is added to a table in the conceptual schema, yet existing application programs and user views keep working unchanged. This is possible because of:
सही उत्तर: ग) Logical data independence
Logical data independence is the ability to change the conceptual schema without changing the external schemas or the programs written against them.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The overall design of a database, which changes rarely, is called its schema. The data stored in the database at a particular moment is called a(n):
सही उत्तर: ख) Instance
A schema is the logical structure; an instance (database state) is the actual collection of data at a given time.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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