कम्प्युटर ज्ञान – Computer Knowledge MCQ
कम्प्युटर ज्ञान – IT प्रवेश
Computer Knowledge · IT Entrance – B.Sc. CSIT, BIT & BCA · ४०७ प्रश्न
४०७ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कम्प्युटर ज्ञान: 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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Under classful addressing, the IPv4 address 150.20.5.9 belongs to which class?
सही उत्तर: ख) Class B
Class B addresses have a first octet from 128 to 191; 150 lies in this range.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which device forwards data packets between different networks using IP addresses?
सही उत्तर: ग) Router
A router works at the network layer and chooses the path for each packet.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which layer of the OSI model is responsible for routing packets between networks?
सही उत्तर: घ) Network layer
The network layer (layer 3) handles logical (IP) addressing and routing.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which SQL command is used to add a new column to an existing table?
सही उत्तर: क) ALTER TABLE
ALTER TABLE ... ADD column changes the structure of a table; UPDATE changes data values.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A column 'marks' has the values 10, 20, 30 and NULL. What does SELECT AVG(marks) return?
सही उत्तर: ख) 20
Aggregate functions ignore NULL, so AVG = (10 + 20 + 30)/3 = 20.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A relation is in 2NF if it is in 1NF and has no:
सही उत्तर: ग) partial dependency on part of a composite key
Second normal form requires every non-key attribute to depend on the whole primary key, not just part of it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A relation is in 3NF if it is in 2NF and has no:
सही उत्तर: ख) transitive dependency of non-key attributes on the key
Third normal form removes transitive dependencies, where a non-key attribute depends on another non-key attribute.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which SQL command removes selected rows from a table but keeps the table structure?
सही उत्तर: घ) DELETE
DELETE ... WHERE removes matching rows; DROP removes the whole table including its structure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Compared with a linked list, the main advantage of an array is that:
सही उत्तर: ख) any element can be accessed directly by its index
Array elements sit in contiguous memory, so element i is reached in constant time; a linked list must be traversed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The values 5, 8 and 3 are inserted (enqueued) into an empty queue in that order, and then one element is removed. Which element is now at the front?
सही उत्तर: ग) 8
A queue is FIFO: 5 is removed first, leaving 8 at the front.
💬 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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