आईओई इन्जिनियरिङ प्रवेश (त्रिवि) BE / B.Arch प्रवेश परीक्षा तयारी
आईओई इन्जिनियरिङ प्रवेश (त्रिवि) – BE / B.Arch प्रवेश परीक्षा
IOE BE / B.Arch Entrance · IOE Entrance (TU)
३,८४१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
BE/B.Arch प्रवेश: 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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When a wave on a string is reflected from a rigidly fixed end, the reflected wave undergoes a phase change of:
सही उत्तर: क) π
A fixed end must be a node, so the reflected wave is inverted, i.e. phase change of π.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The wave y = A sin(ωt + kx) travels:
सही उत्तर: क) along the negative x-direction
The phase ωt + kx stays constant when x decreases as t increases, so the wave moves towards −x with speed ω/k.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A source of sound and an observer move in the same direction with the same speed through still air. The frequency heard by the observer is:
सही उत्तर: ग) the same as the source frequency
With v_s = v_o in the same direction, f′ = f(v − v_o)/(v − v_s) = f; there is no relative motion and no Doppler shift.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The speed of longitudinal waves in a steel rod with Young's modulus 2 × 10¹¹ N/m² and density 8000 kg/m³ is:
सही उत्तर: ख) 5000 m/s
v = √(Y/ρ) = √(2 × 10¹¹/8000) = √(2.5 × 10⁷) = 5000 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Relative humidity of air is defined as the ratio of:
सही उत्तर: क) the actual vapour pressure to the saturated vapour pressure at the same temperature
RH = (actual vapour pressure/SVP at that temperature) × 100%; it equals 100% when the air is saturated.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A gas cannot be liquefied by increasing pressure alone if its temperature is above its:
सही उत्तर: ख) critical temperature
Above the critical temperature there is no distinction between liquid and vapour, so no amount of compression produces a liquid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Newton's law of cooling (small temperature difference), the temperature T of a body in surroundings at T₀ varies with time as:
सही उत्तर: क) T − T₀ = (Tᵢ − T₀)e^(−kt)
dT/dt = −k(T − T₀) integrates to an exponential decay of the excess temperature: T − T₀ = (Tᵢ − T₀)e^(−kt).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A perfectly black body of surface area 1 m² is at 1000 K. The power it radiates is about (σ = 5.67 × 10⁻⁸ W m⁻² K⁻⁴):
सही उत्तर: ख) 56.7 kW
P = σAT⁴ = 5.67 × 10⁻⁸ × 1 × 10¹² = 5.67 × 10⁴ W = 56.7 kW.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The thermal resistance of a slab of thickness L, area A and thermal conductivity K is:
सही उत्तर: क) L/(KA)
Heat current H = KAΔT/L = ΔT/(L/KA), so by analogy with Ohm's law the thermal resistance is L/(KA).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An ideal Otto (petrol) engine cycle has a compression ratio of 8 and uses air with γ = 1.4. Its efficiency is about:
सही उत्तर: घ) 56%
η = 1 − 1/r^(γ−1) = 1 − 8^(−0.4) ≈ 1 − 0.435 = 0.565, i.e. about 56%.
💬 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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