कम्प्युटर आधारभूत ज्ञान र हार्डवेयर – Computer Fundamentals & Hardware MCQ
कम्प्युटर आधारभूत ज्ञान र हार्डवेयर – कम्प्युटर र IT
Computer Fundamentals & Hardware · Computer & IT (Technical) · ५७४ प्रश्न
५७४ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कम्प्युटर आधारभूत ज्ञान र हार्डवेयर: 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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How many 3-to-8 line decoders with enable inputs are needed to build a 4-to-16 line decoder?
सही उत्तर: ख) 2
The most significant input bit enables one decoder (outputs 0-7) or the other (outputs 8-15), so two are needed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 4-bit parallel (ripple-carry) binary adder that also accepts an input carry is built from how many full adders?
सही उत्तर: ख) 4
One full adder is needed for each of the 4 bit positions, the carry-out of each feeding the next.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A full adder can be constructed using:
सही उत्तर: ग) two half adders and an OR gate
The first half adder adds A and B, the second adds the carry-in, and an OR gate combines the two carries.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The sum output of a full adder with inputs A, B and carry-in C is given by:
सही उत्तर: ख) A XOR B XOR C
The full adder sum is 1 when an odd number of the three inputs is 1, which is A XOR B XOR C; AB + BC + CA is the carry.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An AND gate whose inputs are both inverted (bubbled) is logically equivalent to a:
सही उत्तर: घ) NOR gate
By De Morgan's theorem A'.B' = (A + B)', which is the NOR function.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When the 2-variable function F = A + B is written in canonical Sum-of-Products form, it contains how many minterms?
सही उत्तर: क) 3
A + B is 1 for AB = 01, 10 and 11, so F = A'B + AB' + AB has three minterms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Boolean expression A XOR A always equals:
सही उत्तर: क) 0
XOR gives 1 only when its inputs differ; a variable XOR-ed with itself never differs, so the result is 0.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Boolean law stating that A + A = A and A.A = A is called the:
सही उत्तर: क) idempotent law
The idempotent law says combining a variable with itself by OR or AND leaves it unchanged.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Boolean algebra, A + 1 is always equal to:
सही उत्तर: क) 1
OR-ing any variable with 1 always gives 1 (null or dominance law).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which 2-input gate can act as a controlled inverter, passing input A unchanged when the control input is 0 and inverting A when the control is 1?
सही उत्तर: ग) XOR gate
A XOR 0 = A and A XOR 1 = A', so an XOR gate inverts its data input only when the control line is high.
💬 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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