कम्प्युटर / सूचना प्रविधि कम्प्युटर अधिकृत (सातौँ तह) – प्राविधिक पत्र
कम्प्युटर / सूचना प्रविधि – कम्प्युटर अधिकृत (सातौँ तह)
Computer Officer – 7th Level · Computer & IT Posts
१,५०२ प्रश्न उपलब्ध। मोड छान्नुहोस्:
प्राविधिक पत्र: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ५ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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In memory-mapped I/O:
सही उत्तर: ख) I/O devices share the memory address space and are accessed with ordinary memory instructions
Memory-mapped I/O assigns device registers to memory addresses, so normal load/store instructions access them.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Intel 8086 microprocessor has a 20-bit address bus. The maximum memory it can address is:
सही उत्तर: क) 1 MB
2^20 = 1,048,576 locations = 1 MB.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Intel 8085 is a/an:
सही उत्तर: घ) 8-bit microprocessor
The 8085 has an 8-bit data bus and ALU (with a 16-bit address bus), so it is an 8-bit microprocessor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a little-endian system, a multi-byte value is stored with:
सही उत्तर: ख) its least significant byte at the lowest memory address
Little-endian (e.g. Intel x86) stores the least significant byte first, at the lowest address.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pipeline hazard caused by branch or jump instructions is called a:
सही उत्तर: ख) control hazard
Branches change the flow of instructions, so the pipeline may fetch the wrong instructions; this is a control hazard.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a very long sequence of instructions, the ideal speedup of a 5-stage pipeline over a non-pipelined processor approaches:
सही उत्तर: ख) 5
With no stalls, a k-stage pipeline completes nearly one instruction per cycle, giving a speedup close to k.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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By Amdahl's law, if 50% of a program can be parallelised, the maximum possible speedup using an unlimited number of processors is:
सही उत्तर: क) 2
Speedup = 1 / ((1 - P) + P/N); with P = 0.5 and N very large, speedup approaches 1/0.5 = 2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A program executes 2 x 10^9 instructions with an average CPI of 2 on a 4 GHz processor. Its CPU time is:
सही उत्तर: क) 1 s
CPU time = instructions x CPI / clock rate = (2 x 10^9 x 2) / (4 x 10^9) = 1 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A CPU runs at a clock frequency of 2 GHz. Its clock period is:
सही उत्तर: ख) 0.5 ns
Clock period = 1/f = 1/(2 x 10^9) s = 0.5 x 10^-9 s = 0.5 ns.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A control unit that generates control signals from microinstructions stored in a control memory is called a:
सही उत्तर: क) microprogrammed control unit
In microprogrammed control, sequences of microinstructions in control memory produce the control signals, unlike fixed logic in hardwired control.
💬 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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